[EVDL] LTC6803 EV Battery monitoring chip

EVDL List · Mar 1, 2011
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EVDL List · Mar 1, 2011

I got excited when I saw this post, but then I read the datasheet and
found out that they are designed to measure individual cells (such as
3.7v LiIon), so the sensing range only goes from 0-5v (and the chip is
rated with an absolute max of 8v between cells, but can't actually
measure 5-8v).

So, unless you can use 2V cells, or drill into your PbA batteries to
connect to each individual cell, this probably won't work with lead acid
batteries. (I have 6v batteries).

Does anybody have a pointer to a similar chip which can do 8v or 14v, so
it can be used with individual PbA battery instead of with individual
cells within the battery?

Jay

brucedp4 wrote:
> Measures up to 12 individual battery cells in series
> =

> http://www.eeherald.com/section/new-products/nps2011022721.html
> 27th Feb 2011 ... Linear Technology has announced LTC6803, a high =

> voltage battery monitor for ... (EVs) and other high voltage, high =

> performance battery systems. =

> =

> The LTC6803 is a complete battery measuring IC that includes a 12-bit =

> ADC, a precision voltage reference, a high voltage input multiplexer =

> and a serial interface. The key features of LTC6803 include:
> =

> LTC6803 can measure up to 12 individual battery cells in series.
> Multiple LTC6803s can be stacked in series without optocouplers or =

> isolators, permitting precision voltage monitoring of every cell in =

> long strings of series-connected batteries. The LTC6803 is compatible =

> with LTC6802. The maximum total measurement error of the LTC6803 is =

> guaranteed to be less than 0.25% from -40=C2=B0C to 125=C2=B0C.
> =

> The LTC6803 offers an extended cell measurement range from -300mV to =

> 5V, enabling the LTC6803 to monitor a wide range of battery =

> chemistries, as well as supercapacitors. Each cell is monitored for =

> undervoltage and overvoltage conditions, and an associated MOSFET is =

> available to discharge overcharged cells. Feature onboard 5V regulator,
> temperature sensor, GPIO lines and thermistor inputs. Consumes standby
> mode current of less than 12uA.
> =

> Power input of the LTC6803 is isolated from the stack, allowing the =

> LTC6803 to draw current from an independent source. When powering from
> this input, the current draw on the pack is reduced to less than 1=C2=B5A.
> LTC6803 includes a redundant voltage reference, extensive logic test =

> circuitry, open wire detection capability and a watchdog timer for =

> fail-safe designs. LTC6803 is designed to withstand up to 75V, =

> providing more than 20% of overvoltage margin for a full string of 12 =

> cells. The 1MHz serial interface includes packet error checking and is
> designed to operate in the presence of large amounts of noise and =

> transients ...
> Package: 8mm x 12mm 44-Lead SSOP Package
> Availability: Now in samples
> Price: Each $9.95 for 1K pieces
> Editorial Product Rating: ** (Average Plus) ... www.linear.com
> [=C2=A92010 Electronics Engineering Herald]
> =

> =

> =

> =

> {brucedp.150m.com}
> =

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 260 bytes
Desc: OpenPGP digital signature
Url : http://lists.sjsu.edu/mailman/private/ev/attachments/20110301/2cf1903=
3/attachment.asc =

_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev

EVDL List · Mar 3, 2011

OK, so I did some web research and got:

http://google.com/#sclient=psy&hl=en&q=chip+ic+battery+monitor
gives

http://www.analog.com/en/press-release/Oct_16_2006_ADI_Adv_Auto_Battery_Monitoring/press.html
ANALOG DEVICES ADVANCES AUTOMOTIVE BATTERY MONITORING WITH HIGHLY
INTEGRATED MIXED-SIGNAL IC

http://google.com/#sclient=psy&hl=en&q=chip+ic+battery+monitor+6v
gives

http://homepages.which.net/~paul.hills/Circuits/BatteryMonitor/BatteryMonitor.html
Battery Monitoring [several chips listed]

http://www.myra-simon.com/bike/charger.html
Sealed Lead-Acid Battery Charger Circuit [L200 chip]

Lastly, try
http://google.com/#sclient=psy&hl=en&q=chip+ic+battery+monitor+pbso4

I hope this helps.
{brucedp.150m.com}

--
View this message in context: http://electric-vehicle-discussion-list.413529.n4.nabble.com/LTC6803-EV-Battery-monitoring-chip-tp3329682p3332766.html
Sent from the Electric Vehicle Discussion List mailing list archive at Nabble.com.

_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev

EVDL List · Mar 3, 2011

Granted, it would up the cost of the project, but could you use some sort of
scaler chip that takes 0-15V, cuts it by 3, and outputs 0-5V? That'd work as
an input range for the LTC6803.

brucedp5 <[email protected]> wrote:

> OK, so I did some web research and got:
>
> http://google.com/#sclient=psy&hl=en&q=chip+ic+battery+monitor
> gives
>
>
> http://www.analog.com/en/press-release/Oct_16_2006_ADI_Adv_Auto_Battery_Monitoring/press.html
> ANALOG DEVICES ADVANCES AUTOMOTIVE BATTERY MONITORING WITH HIGHLY
> INTEGRATED MIXED-SIGNAL IC
>
>
>
> http://google.com/#sclient=psy&hl=en&q=chip+ic+battery+monitor+6v
> gives
>
>
> http://homepages.which.net/~paul.hills/Circuits/BatteryMonitor/BatteryMonitor.html
> Battery Monitoring [several chips listed]
>
> http://www.myra-simon.com/bike/charger.html
> Sealed Lead-Acid Battery Charger Circuit [L200 chip]
>
>
> Lastly, try
> http://google.com/#sclient=psy&hl=en&q=chip+ic+battery+monitor+pbso4
>
>
> I hope this helps.
> {brucedp.150m.com}
>
> --
> View this message in context:
> http://electric-vehicle-discussion-list.413529.n4.nabble.com/LTC6803-EV-Battery-monitoring-chip-tp3329682p3332766.html
> Sent from the Electric Vehicle Discussion List mailing list archive at
> Nabble.com.
>
> _______________________________________________
> | REPLYING: address your message to [email protected] only.
> | Multiple-address or CCed messages may be rejected.
> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
> | OTHER HELP: http://evdl.org/help/
> | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.sjsu.edu/mailman/private/ev/attachments/20110303/8463b4a9/attachment.html
_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev

EVDL List · Mar 3, 2011

I actually was thinking about that, but the complication is that the
chip uses each wire in two different directions (+ from lower battery,
and - from upper battery). Most voltage scaling chips would have
problems being chained and expected to work with both batteries, etc..

But I am now thinking that perhaps a half-rectifier type arrangement
(two diodes back to back) on each sensing wire would act to reduce the
voltage by the diodes voltage drop, not exactly a scale just a straight
subtraction, but since our batteries should never need to be measured in
the 0-3v range, it should work....somebody with an EE degree can tell me
if I'm totally off base here...

The only way to tell for sure if this would actually work with the chips
internal circuits is to buy one and try it out...

Jay

Jeff Haskell wrote:
> Granted, it would up the cost of the project, but could you use some sort of
> scaler chip that takes 0-15V, cuts it by 3, and outputs 0-5V? That'd work as
> an input range for the LTC6803.
>
>

brucedp5 <[email protected]> wrote:
>
>> OK, so I did some web research and got:
>>
>> http://google.com/#sclient=psy&hl=en&q=chip+ic+battery+monitor
>> gives
>>
>>
>> http://www.analog.com/en/press-release/Oct_16_2006_ADI_Adv_Auto_Battery_Monitoring/press.html
>> ANALOG DEVICES ADVANCES AUTOMOTIVE BATTERY MONITORING WITH HIGHLY
>> INTEGRATED MIXED-SIGNAL IC
>>
>>
>>
>> http://google.com/#sclient=psy&hl=en&q=chip+ic+battery+monitor+6v
>> gives
>>
>>
>> http://homepages.which.net/~paul.hills/Circuits/BatteryMonitor/BatteryMonitor.html
>> Battery Monitoring [several chips listed]
>>
>> http://www.myra-simon.com/bike/charger.html
>> Sealed Lead-Acid Battery Charger Circuit [L200 chip]
>>
>>
>> Lastly, try
>> http://google.com/#sclient=psy&hl=en&q=chip+ic+battery+monitor+pbso4
>>
>>
>> I hope this helps.
>> {brucedp.150m.com}
>>
>> --
>> View this message in context:
>> http://electric-vehicle-discussion-list.413529.n4.nabble.com/LTC6803-EV-Battery-monitoring-chip-tp3329682p3332766.html
>> Sent from the Electric Vehicle Discussion List mailing list archive at
>> Nabble.com.
>>
>> _______________________________________________
>> | REPLYING: address your message to [email protected] only.
>> | Multiple-address or CCed messages may be rejected.
>> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
>> | OTHER HELP: http://evdl.org/help/
>> | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
>>
> -------------- next part --------------
> An HTML attachment was scrubbed...
> URL: http://lists.sjsu.edu/mailman/private/ev/attachments/20110303/8463b4a9/attachment.html
> _______________________________________________
> | REPLYING: address your message to [email protected] only.
> | Multiple-address or CCed messages may be rejected.
> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
> | OTHER HELP: http://evdl.org/help/
> | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 260 bytes
Desc: OpenPGP digital signature
Url : http://lists.sjsu.edu/mailman/private/ev/attachments/20110303/1d5d3230/attachment.asc
_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev

EVDL List · Mar 3, 2011

Hi all,

What about the low tech solution - simple resistor voltage divider.

eg for a 6v lead acid battery.
put two high ohm resistors in series from batt- to batt+
connect sensor pin 1 to batt-
connect sensor pin 2 to connection between resistors
connect sensor pin 3 to batt+
(and so on for all your batts in series)

On the software side, take the voltage reading between 1&2 and between
2&3 and simply add them together to give the voltage of the 6v batt.
It doesn't matter about the exact values of the resistors or their
precision, since you simply want the sum of the two voltages - as long
as each individual voltage stays within 0-5v.

Similarly, you could do a 12v battery by dividing it with three
resistors instead of two, though you'd want to be a bit more accurate
matching the resistors, since at full charge the voltage will approach
15v (which divided into 3 is 5v - the limit of the sensors)

Granted, this uses more sensor pins per battery, but it will probably
turn out cheaper to use multiple sensor chips than fancy scaling
circuits on each sensor pin.

Mark

On 4 March 2011 01:53, Jay Summet <[email protected]> wrote:
> I actually was thinking about that, but the complication is that the
> chip uses each wire in two different directions (+ from lower battery,
> and - from upper battery). Most voltage scaling chips would have
> problems being chained and expected to work with both batteries, etc..
>
> But I am now thinking that perhaps a half-rectifier type arrangement
> (two diodes back to back) on each sensing wire would act to reduce the
> voltage by the diodes voltage drop, not exactly a scale just a straight
> subtraction, but since our batteries should never need to be measured in
> the 0-3v range, it should work....somebody with an EE degree can tell me
> if I'm totally off base here...
>
> The only way to tell for sure if this would actually work with the chips
> internal circuits is to buy one and try it out...
>
> Jay
>
> Jeff Haskell wrote:
>> Granted, it would up the cost of the project, but could you use some sor=
t of
>> scaler chip that takes 0-15V, cuts it by 3, and outputs 0-5V? That'd wor=
k as
>> an input range for the LTC6803.
>>
>>

brucedp5 <[email protected]> wrote:
>>
>>> OK, so I did some web research and got:
>>>
>>> http://google.com/#sclient=3Dpsy&hl=3Den&q=3Dchip+ic+battery+monitor
>>> gives
>>>
>>>
>>> http://www.analog.com/en/press-release/Oct_16_2006_ADI_Adv_Auto_Battery=
_Monitoring/press.html
>>> ANALOG DEVICES ADVANCES AUTOMOTIVE BATTERY MONITORING WITH HIGHLY
>>> INTEGRATED MIXED-SIGNAL IC
>>>
>>>
>>>
>>> http://google.com/#sclient=3Dpsy&hl=3Den&q=3Dchip+ic+battery+monitor+6v
>>> gives
>>>
>>>
>>> http://homepages.which.net/~paul.hills/Circuits/BatteryMonitor/BatteryM=
onitor.html
>>> Battery Monitoring [several chips listed]
>>>
>>> http://www.myra-simon.com/bike/charger.html
>>> Sealed Lead-Acid Battery Charger Circuit [L200 chip]
>>>
>>>
>>> Lastly, try
>>> http://google.com/#sclient=3Dpsy&hl=3Den&q=3Dchip+ic+battery+monitor+pb=
so4
>>>
>>>
>>> I hope this helps.
>>> {brucedp.150m.com}
>>>
>>> --
>>> View this message in context:
>>> http://electric-vehicle-discussion-list.413529.n4.nabble.com/LTC6803-EV=
-Battery-monitoring-chip-tp3329682p3332766.html
>>> Sent from the Electric Vehicle Discussion List mailing list archive at
>>> Nabble.com.
>>>
>>> _______________________________________________
>>> | REPLYING: address your message to [email protected] only.
>>> | Multiple-address or CCed messages may be rejected.
>>> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
>>> | OTHER HELP: http://evdl.org/help/
>>> | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
>>>
>> -------------- next part --------------
>> An HTML attachment was scrubbed...
>> URL: http://lists.sjsu.edu/mailman/private/ev/attachments/20110303/8463b=
4a9/attachment.html
>> _______________________________________________
>> | REPLYING: address your message to [email protected] only.
>> | Multiple-address or CCed messages may be rejected.
>> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
>> | OTHER HELP: http://evdl.org/help/
>> | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
>
> -------------- next part --------------
> A non-text attachment was scrubbed...
> Name: signature.asc
> Type: application/pgp-signature
> Size: 260 bytes
> Desc: OpenPGP digital signature
> Url : http://lists.sjsu.edu/mailman/private/ev/attachments/20110303/1d5d3=
230/attachment.asc
> _______________________________________________
> | REPLYING: address your message to [email protected] only.
> | Multiple-address or CCed messages may be rejected.
> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
> | OTHER HELP: http://evdl.org/help/
> | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
>

_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev

EVDL List · Mar 3, 2011

Dear Sir/ Maa'm
Please don't send anymore email regarding any kinds of battery or whatever =

product you have. It has been years that I am receiving these emails for yo=
u. I =

put them in spam and I still recieve them. I am not interesed.
Thank you

________________________________
From: Jay Summet <[email protected]>
To: Electric Vehicle Discussion List <[email protected]>
Sent: Thu, March 3, 2011 6:53:02 AM
Subject: Re: [EVDL] LTC6803 EV Battery monitoring chip

I actually was thinking about that, but the complication is that the
chip uses each wire in two different directions (+ from lower battery,
and - from upper battery). Most voltage scaling chips would have
problems being chained and expected to work with both batteries, etc..

But I am now thinking that perhaps a half-rectifier type arrangement
(two diodes back to back) on each sensing wire would act to reduce the
voltage by the diodes voltage drop, not exactly a scale just a straight
subtraction, but since our batteries should never need to be measured in
the 0-3v range, it should work....somebody with an EE degree can tell me
if I'm totally off base here...

The only way to tell for sure if this would actually work with the chips
internal circuits is to buy one and try it out...

Jay

Jeff Haskell wrote:
> Granted, it would up the cost of the project, but could you use some sort=
of
> scaler chip that takes 0-15V, cuts it by 3, and outputs 0-5V? That'd work=
as
> an input range for the LTC6803.
> =

>

brucedp5 <[email protected]> wrote:
> =

>> OK, so I did some web research and got:
>>
>> http://google.com/#sclient=3Dpsy&hl=3Den&q=3Dchip+ic+battery+monitor
>> gives
>>
>>
>>http://www.analog.com/en/press-release/Oct_16_2006_ADI_Adv_Auto_Battery_M=
onitoring/press.html
>>l
>> ANALOG DEVICES ADVANCES AUTOMOTIVE BATTERY MONITORING WITH HIGHLY
>> INTEGRATED MIXED-SIGNAL IC
>>
>>
>>
>> http://google.com/#sclient=3Dpsy&hl=3Den&q=3Dchip+ic+battery+monitor+6v
>> gives
>>
>>
>>http://homepages.which.net/~paul.hills/Circuits/BatteryMonitor/BatteryMon=
itor.html
>>l
>> Battery Monitoring [several chips listed]
>>
>> http://www.myra-simon.com/bike/charger.html
>> Sealed Lead-Acid Battery Charger Circuit [L200 chip]
>>
>>
>> Lastly, try
>> http://google.com/#sclient=3Dpsy&hl=3Den&q=3Dchip+ic+battery+monitor+pbs=
o4
>>
>>
>> I hope this helps.
>> {brucedp.150m.com}
>>
>> --
>> View this message in context:
>>http://electric-vehicle-discussion-list.413529.n4.nabble.com/LTC6803-EV-B=
attery-monitoring-chip-tp3329682p3332766.html
>>l
>> Sent from the Electric Vehicle Discussion List mailing list archive at
>> Nabble.com.
>>
>> _______________________________________________
>> | REPLYING: address your message to [email protected] only.
>> | Multiple-address or CCed messages may be rejected.
>> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
>> | OTHER HELP: http://evdl.org/help/
>> | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
>>
> -------------- next part --------------
> An HTML attachment was scrubbed...
> URL: =

>http://lists.sjsu.edu/mailman/private/ev/attachments/20110303/8463b4a9/att=
achment.html
> =

> _______________________________________________
> | REPLYING: address your message to [email protected] only.
> | Multiple-address or CCed messages may be rejected.
> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
> | OTHER HELP: http://evdl.org/help/
> | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 260 bytes
Desc: OpenPGP digital signature
Url : =

http://lists.sjsu.edu/mailman/private/ev/attachments/20110303/1d5d3230/atta=
chment.asc
=

_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.sjsu.edu/mailman/private/ev/attachments/20110303/0232480e=
/attachment.html =

_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev

EVDL List · Mar 3, 2011

Dear Sir/ Maa'm
Please don't send anymore email regarding any kinds of battery or whatever =

product you have. It has been years that I am receiving these emails for yo=
u. I =

put them in spam and I still recieve them. I am not interesed.
Thank you

________________________________
From: Jay Summet <[email protected]>
To: Electric Vehicle Discussion List <[email protected]>
Sent: Thu, March 3, 2011 6:53:02 AM
Subject: Re: [EVDL] LTC6803 EV Battery monitoring chip

I actually was thinking about that, but the complication is that the
chip uses each wire in two different directions (+ from lower battery,
and - from upper battery). Most voltage scaling chips would have
problems being chained and expected to work with both batteries, etc..

But I am now thinking that perhaps a half-rectifier type arrangement
(two diodes back to back) on each sensing wire would act to reduce the
voltage by the diodes voltage drop, not exactly a scale just a straight
subtraction, but since our batteries should never need to be measured in
the 0-3v range, it should work....somebody with an EE degree can tell me
if I'm totally off base here...

The only way to tell for sure if this would actually work with the chips
internal circuits is to buy one and try it out...

Jay

Jeff Haskell wrote:
> Granted, it would up the cost of the project, but could you use some sort=
of
> scaler chip that takes 0-15V, cuts it by 3, and outputs 0-5V? That'd work=
as
> an input range for the LTC6803.
> =

>

brucedp5 <[email protected]> wrote:
> =

>> OK, so I did some web research and got:
>>
>> http://google.com/#sclient=3Dpsy&hl=3Den&q=3Dchip+ic+battery+monitor
>> gives
>>
>>
>>http://www.analog.com/en/press-release/Oct_16_2006_ADI_Adv_Auto_Battery_M=
onitoring/press.html
>>l
>> ANALOG DEVICES ADVANCES AUTOMOTIVE BATTERY MONITORING WITH HIGHLY
>> INTEGRATED MIXED-SIGNAL IC
>>
>>
>>
>> http://google.com/#sclient=3Dpsy&hl=3Den&q=3Dchip+ic+battery+monitor+6v
>> gives
>>
>>
>>http://homepages.which.net/~paul.hills/Circuits/BatteryMonitor/BatteryMon=
itor.html
>>l
>> Battery Monitoring [several chips listed]
>>
>> http://www.myra-simon.com/bike/charger.html
>> Sealed Lead-Acid Battery Charger Circuit [L200 chip]
>>
>>
>> Lastly, try
>> http://google.com/#sclient=3Dpsy&hl=3Den&q=3Dchip+ic+battery+monitor+pbs=
o4
>>
>>
>> I hope this helps.
>> {brucedp.150m.com}
>>
>> --
>> View this message in context:
>>http://electric-vehicle-discussion-list.413529.n4.nabble.com/LTC6803-EV-B=
attery-monitoring-chip-tp3329682p3332766.html
>>l
>> Sent from the Electric Vehicle Discussion List mailing list archive at
>> Nabble.com.
>>
>> _______________________________________________
>> | REPLYING: address your message to [email protected] only.
>> | Multiple-address or CCed messages may be rejected.
>> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
>> | OTHER HELP: http://evdl.org/help/
>> | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
>>
> -------------- next part --------------
> An HTML attachment was scrubbed...
> URL: =

>http://lists.sjsu.edu/mailman/private/ev/attachments/20110303/8463b4a9/att=
achment.html
> =

> _______________________________________________
> | REPLYING: address your message to [email protected] only.
> | Multiple-address or CCed messages may be rejected.
> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
> | OTHER HELP: http://evdl.org/help/
> | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 260 bytes
Desc: OpenPGP digital signature
Url : =

http://lists.sjsu.edu/mailman/private/ev/attachments/20110303/1d5d3230/atta=
chment.asc
=

_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.sjsu.edu/mailman/private/ev/attachments/20110303/f9d04e59=
/attachment.html =

_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev

EVDL List · Mar 4, 2011

Ahh the irony....this guy complains about EVDL spamming him, then he spams
the EVDL with 9 or 10 duplicate, dumb messages in 5 minutes.

To quote ventriloquist Jeff Dunham's "Walter": "Dumbass!"

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf
Of Aazam Fakharian
Sent: Thursday, March 03, 2011 3:26 PM
To: Electric Vehicle Discussion List
Subject: Re: [EVDL] LTC6803 EV Battery monitoring chip

Dear Sir/ Maa'm
Please don't send anymore email regarding any kinds of battery or whatever =

product you have. It has been years that I am receiving these emails for
you. I =

put them in spam and I still recieve them. I am not interesed.
Thank you

________________________________
From: Jay Summet <[email protected]>
To: Electric Vehicle Discussion List <[email protected]>
Sent: Thu, March 3, 2011 6:53:02 AM
Subject: Re: [EVDL] LTC6803 EV Battery monitoring chip

I actually was thinking about that, but the complication is that the
chip uses each wire in two different directions (+ from lower battery,
and - from upper battery). Most voltage scaling chips would have
problems being chained and expected to work with both batteries, etc..

But I am now thinking that perhaps a half-rectifier type arrangement
(two diodes back to back) on each sensing wire would act to reduce the
voltage by the diodes voltage drop, not exactly a scale just a straight
subtraction, but since our batteries should never need to be measured in
the 0-3v range, it should work....somebody with an EE degree can tell me
if I'm totally off base here...

The only way to tell for sure if this would actually work with the chips
internal circuits is to buy one and try it out...

Jay

Jeff Haskell wrote:
> Granted, it would up the cost of the project, but could you use some sort
of
> scaler chip that takes 0-15V, cuts it by 3, and outputs 0-5V? That'd work
as
> an input range for the LTC6803.
> =

>

brucedp5 <[email protected]> wrote:
> =

>> OK, so I did some web research and got:
>>
>> http://google.com/#sclient=3Dpsy&hl=3Den&q=3Dchip+ic+battery+monitor
>> gives
>>
>>
>>http://www.analog.com/en/press-release/Oct_16_2006_ADI_Adv_Auto_Battery_Mo
nitoring/press.html
>>l
>> ANALOG DEVICES ADVANCES AUTOMOTIVE BATTERY MONITORING WITH HIGHLY
>> INTEGRATED MIXED-SIGNAL IC
>>
>>
>>
>> http://google.com/#sclient=3Dpsy&hl=3Den&q=3Dchip+ic+battery+monitor+6v
>> gives
>>
>>
>>http://homepages.which.net/~paul.hills/Circuits/BatteryMonitor/BatteryMoni
tor.html
>>l
>> Battery Monitoring [several chips listed]
>>
>> http://www.myra-simon.com/bike/charger.html
>> Sealed Lead-Acid Battery Charger Circuit [L200 chip]
>>
>>
>> Lastly, try
>> http://google.com/#sclient=3Dpsy&hl=3Den&q=3Dchip+ic+battery+monitor+pbs=
o4
>>
>>
>> I hope this helps.
>> {brucedp.150m.com}
>>
>> --
>> View this message in context:
>>http://electric-vehicle-discussion-list.413529.n4.nabble.com/LTC6803-EV-Ba
ttery-monitoring-chip-tp3329682p3332766.html
>>l
>> Sent from the Electric Vehicle Discussion List mailing list archive at
>> Nabble.com.
>>
>> _______________________________________________
>> | REPLYING: address your message to [email protected] only.
>> | Multiple-address or CCed messages may be rejected.
>> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
>> | OTHER HELP: http://evdl.org/help/
>> | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
>>
> -------------- next part --------------
> An HTML attachment was scrubbed...
> URL: =

>http://lists.sjsu.edu/mailman/private/ev/attachments/20110303/8463b4a9/atta
chment.html
> =

> _______________________________________________
> | REPLYING: address your message to [email protected] only.
> | Multiple-address or CCed messages may be rejected.
> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
> | OTHER HELP: http://evdl.org/help/
> | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 260 bytes
Desc: OpenPGP digital signature
Url : =

http://lists.sjsu.edu/mailman/private/ev/attachments/20110303/1d5d3230/attac
hment.asc
=

_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
http://lists.sjsu.edu/mailman/private/ev/attachments/20110303/f9d04e59/attac
hment.html =

_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev

_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev

EVDL List · Mar 4, 2011

Yes, a voltage divider on each battery would work, but it would half the
number of six volt batteries you could measure (to six). And be even
worse for the 12 volt batteries (4 batteries). (The main problem is that
the chip multiplexes input lines, which is normally good, but in high
voltage cases, you can't construct independent voltage dividers.)

Also: I realize that with the correct high ohm resistors the current
draw from the batteries would be so small as to not matter for EV
applications, but I really like the idea of near 0 draw when the chip is
in standby mode, which you would lose with a voltage divider array.

Jay

Mark Fowler wrote:
> Hi all,
>
> What about the low tech solution - simple resistor voltage divider.
>
> eg for a 6v lead acid battery.
> put two high ohm resistors in series from batt- to batt+
> connect sensor pin 1 to batt-
> connect sensor pin 2 to connection between resistors
> connect sensor pin 3 to batt+
> (and so on for all your batts in series)
>
> On the software side, take the voltage reading between 1&2 and between
> 2&3 and simply add them together to give the voltage of the 6v batt.
> It doesn't matter about the exact values of the resistors or their
> precision, since you simply want the sum of the two voltages - as long
> as each individual voltage stays within 0-5v.
>
> Similarly, you could do a 12v battery by dividing it with three
> resistors instead of two, though you'd want to be a bit more accurate
> matching the resistors, since at full charge the voltage will approach
> 15v (which divided into 3 is 5v - the limit of the sensors)
>
> Granted, this uses more sensor pins per battery, but it will probably
> turn out cheaper to use multiple sensor chips than fancy scaling
> circuits on each sensor pin.
>
> Mark
>
> On 4 March 2011 01:53, Jay Summet <[email protected]> wrote:
>> I actually was thinking about that, but the complication is that the
>> chip uses each wire in two different directions (+ from lower battery,
>> and - from upper battery). Most voltage scaling chips would have
>> problems being chained and expected to work with both batteries, etc..
>>
>> But I am now thinking that perhaps a half-rectifier type arrangement
>> (two diodes back to back) on each sensing wire would act to reduce the
>> voltage by the diodes voltage drop, not exactly a scale just a straight
>> subtraction, but since our batteries should never need to be measured in
>> the 0-3v range, it should work....somebody with an EE degree can tell me
>> if I'm totally off base here...
>>
>> The only way to tell for sure if this would actually work with the chips
>> internal circuits is to buy one and try it out...
>>
>> Jay
>>
>> Jeff Haskell wrote:
>>> Granted, it would up the cost of the project, but could you use some sort of
>>> scaler chip that takes 0-15V, cuts it by 3, and outputs 0-5V? That'd work as
>>> an input range for the LTC6803.
>>>
>>>

brucedp5 <[email protected]> wrote:
>>>
>>>> OK, so I did some web research and got:
>>>>
>>>> http://google.com/#sclient=psy&hl=en&q=chip+ic+battery+monitor
>>>> gives
>>>>
>>>>
>>>> http://www.analog.com/en/press-release/Oct_16_2006_ADI_Adv_Auto_Battery_Monitoring/press.html
>>>> ANALOG DEVICES ADVANCES AUTOMOTIVE BATTERY MONITORING WITH HIGHLY
>>>> INTEGRATED MIXED-SIGNAL IC
>>>>
>>>>
>>>>
>>>> http://google.com/#sclient=psy&hl=en&q=chip+ic+battery+monitor+6v
>>>> gives
>>>>
>>>>
>>>> http://homepages.which.net/~paul.hills/Circuits/BatteryMonitor/BatteryMonitor.html
>>>> Battery Monitoring [several chips listed]
>>>>
>>>> http://www.myra-simon.com/bike/charger.html
>>>> Sealed Lead-Acid Battery Charger Circuit [L200 chip]
>>>>
>>>>
>>>> Lastly, try
>>>> http://google.com/#sclient=psy&hl=en&q=chip+ic+battery+monitor+pbso4
>>>>
>>>>
>>>> I hope this helps.
>>>> {brucedp.150m.com}
>>>>
>>>> --
>>>> View this message in context:
>>>> http://electric-vehicle-discussion-list.413529.n4.nabble.com/LTC6803-EV-Battery-monitoring-chip-tp3329682p3332766.html
>>>> Sent from the Electric Vehicle Discussion List mailing list archive at
>>>> Nabble.com.
>>>>
>>>> _______________________________________________
>>>> | REPLYING: address your message to [email protected] only.
>>>> | Multiple-address or CCed messages may be rejected.
>>>> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
>>>> | OTHER HELP: http://evdl.org/help/
>>>> | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
>>>>
>>> -------------- next part --------------
>>> An HTML attachment was scrubbed...
>>> URL: http://lists.sjsu.edu/mailman/private/ev/attachments/20110303/8463b4a9/attachment.html
>>> _______________________________________________
>>> | REPLYING: address your message to [email protected] only.
>>> | Multiple-address or CCed messages may be rejected.
>>> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
>>> | OTHER HELP: http://evdl.org/help/
>>> | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
>> -------------- next part --------------
>> A non-text attachment was scrubbed...
>> Name: signature.asc
>> Type: application/pgp-signature
>> Size: 260 bytes
>> Desc: OpenPGP digital signature
>> Url : http://lists.sjsu.edu/mailman/private/ev/attachments/20110303/1d5d3230/attachment.asc
>> _______________________________________________
>> | REPLYING: address your message to [email protected] only.
>> | Multiple-address or CCed messages may be rejected.
>> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
>> | OTHER HELP: http://evdl.org/help/
>> | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
>>
>
> _______________________________________________
> | REPLYING: address your message to [email protected] only.
> | Multiple-address or CCed messages may be rejected.
> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
> | OTHER HELP: http://evdl.org/help/
> | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 260 bytes
Desc: OpenPGP digital signature
Url : http://lists.sjsu.edu/mailman/private/ev/attachments/20110304/b06ea553/attachment.asc
_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev

EVDL List · Mar 4, 2011

Jay Summet wrote:
> Yes, a voltage divider on each battery would work, but it would halve
> the number of six volt batteries you could measure (to six). And be
> even worse for the 12 volt batteries (4 batteries). (The main problem
> is that the chip multiplexes input lines, which is normally good, but
> in high voltage cases, you can't construct independent voltage
> dividers.)
>
> Also: I realize that with the correct high ohm resistors the current
> draw from the batteries would be so small as to not matter for EV
> applications, but I really like the idea of near 0 draw when the chip
> is in standby mode, which you would lose with a voltage divider
> array.

The LTC6803 is a neat chip; but it (like most similar chips) is highly
optimized for the special case of a small number of low capacity lithium
cells. These chips are designed for things like laptop computers.

You may want to consider using some generic microcomputer, and
programming it to do the very same things. That way, all the high
voltage and high power parts are external, where *you* can customize
them for the task at hand.

On voltage dividers: Resistive dividers can be built with megohm
resistors, making the current drain trivial. Multimeters, for example,
normally have 10 megohm dividers (1.2 microamps at 12v). But the
internal A/D converters on some micros aren't good enough; you may have
to "shop around" for a micro with a better internal A/D, add a buffer
amp, or use an external A/D chip.
--
Lee A. Hart | Ring the bells that still can ring
814 8th Ave N | Forget the perfect offering
Sartell MN 56377 | There is a crack in everything
leeahart earthlink.net | That's how the light gets in -- Leonard Cohen

_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev

EVDL List · Mar 7, 2011
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EVDL List · Mar 8, 2011

Evan Tuer wrote:
> I use the predecessor, LTC6802, for car BMSs.=C2 The fundamental
> capability of measuring voltages is the same no matter how large the
> cells are, and these ICs have a communication option which allows them
> to be daisychained - for example the BMS is my car handles 40 cells
> using 4 of the ICs.

Do you have these monitoring individual lead acid cells, or 6v
batteries? If 6v batteries, how did you reduce the voltage to the
workable range?

Jay

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 260 bytes
Desc: OpenPGP digital signature
Url : http://lists.sjsu.edu/mailman/private/ev/attachments/20110307/ba2d813=
a/attachment.asc =

_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev

EVDL List · Mar 8, 2011
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EVDL List · Mar 8, 2011

First line on the spec sheet " Measures up to 12 Li-Ion Cells in Series (60V
Max)"

Sincerely,
Mark Grasser
=

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf
Of Jay Summet
Sent: Monday, March 07, 2011 9:41 PM
To: Electric Vehicle Discussion List
Subject: Re: [EVDL] LTC6803 EV Battery monitoring chip

Evan Tuer wrote:
> I use the predecessor, LTC6802, for car BMSs.=C2 The fundamental
> capability of measuring voltages is the same no matter how large the
> cells are, and these ICs have a communication option which allows them
> to be daisychained - for example the BMS is my car handles 40 cells
> using 4 of the ICs.

Do you have these monitoring individual lead acid cells, or 6v
batteries? If 6v batteries, how did you reduce the voltage to the
workable range?

Jay

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 260 bytes
Desc: OpenPGP digital signature
Url :
http://lists.sjsu.edu/mailman/private/ev/attachments/20110307/ba2d813a/attac
hment.asc =

_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev

_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev

EVDL List · Mar 11, 2011

That's for one chip; they're designed to be connected in a daisy chain
for large packs.

Second line on the spec sheet "Stackable architecture enables >1000V systems"

That said, I think they're more appropriate for an OEM battery
solution than a BMS for homebrew EVs. I'm skeptical about how
well/reliably it would work with the amount of noise present in many
homebrew EVs.

In an OEM EV, there will be extensive EMC testing to make sure the
controller doesn't interfere with the BMS and so on, but in a homebrew
EV, no thought is given to such matters.

Highly integrated chips like the LTC6802 can simplify a system and
reduce cost, but they can also be brought down by noise that wouldn't
be a problem in a system with a discrete analog front-end with plenty
of filtering.

-Morgan LaMoore

Mark Grasser <[email protected]> wrote:
>
> First line on the spec sheet " Measures up to 12 Li-Ion Cells in Series (60V
> Max)"
>
> Sincerely,
> Mark Grasser
>

_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev

[EVDL] LTC6803 EV Battery monitoring chip

EVDL List

Registered

EVDL List

Registered

EVDL List

Registered

EVDL List

Registered

EVDL List

Registered

EVDL List

Registered

EVDL List

Registered

EVDL List

Registered

EVDL List

Registered

EVDL List

Registered

EVDL List

Registered

EVDL List

Registered

EVDL List

Registered

EVDL List

Registered

EVDL List

Registered

EVDL List

Registered