Products Mentioned

LTC2943 Production
The LTC2943 measures battery charge state, battery voltage, battery current and its own temperature in portable product applications. The wide input voltage...
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LTC2943 on Analog.com

Associated Drivers

LTC2943 Stops monitoring Battery Voltage a Current

teranz

on Jul 21, 2019

Hi:

I am using a LTC2943 in a small project, it is being monitored with a PIC16F18326 MPU. Everything seemed fine then suddenly it stopped monitoring the battery voltage and current. Strangely the Coulomb counter seems to keep working. I created three breakout-boards with LTC2943 chips, they exhibit the same problem. Is there some programming issue I`ve missed?

Thanks, Tom

m3atwad
on Oct 24, 2019 11:32 PM
Hi Tom,

I wish someone replied to this. I'm having similar problems. I am getting an UVLO condition which could possibly be what is happening to you, but I'm not sure. Without this condition my chips work fine and all the registers are reliable. Check your load current and check bit 0 of the status register to make sure you aren't experiencing what I am.
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Fil

on Nov 4, 2019 9:59 PM in reply to m3atwad
Please send email to bms.support@analog.com
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m3atwad
on Nov 11, 2019 9:53 PM in reply to Fil
Hi Fil,

I will email you - for future readers that find this I think I did have a short step load pulling my input voltage low triggering UVLO.. Use a scope to make sure there aren't any high frequency steps at the chip input.
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DirkH
on Jun 4, 2021 9:32 AM
Hi Tom,

I had a similar issue. I2C communication stopped. In my case I disabled \ALCC in control regiser B and after that I have not had further problems. If you need \ALCC enabled make sure to reply with the ARA command.

Hope that is useful!
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LTC2943 Stops monitoring Battery Voltage a Current