Reading cell voltage from LTC6813IC.

Question

I am using TMS570LS1224 micro controller .and demo circuit 1941D and LTC6813 ic. 
 i am trying to read voltage .but i am able to read voltage of only few cells. 
 so, what should i do.

Sgarg · Accepted Answer

Hi Gautam, 
 have you tried to verify if there is no issue in hardware? can you run the basic linduino code using an arduino to check the hardware performance? 
 To verify your code please refer to this link 
 Regards)

Sgarg · Answer

Hi, 
 You might want to check Cell Selection for ADC Conversion(CH) bits in ADCV command. These bits perform selective conversions of some channel. 
 
 Regards

Sgarg · Answer

Hi Gautam, 
 If you could just put specific part of the code which needs to be reviewed than it is okay with me. 
 the TX length for read command would be 4 bytes only. RX length of the data would be 8 bytes. Please ensure that IC is in wakeup state before you send the command. 
 Are you getting any PEC error for this data? Is it possible for you to check this on DSO and confirm the clock and CS patterns this is an unusual behavior and not possible from AFE side. Just to rule out other possibilities can you send clear cell register command before each ADCV and then confirm the values.

Sgarg · Answer

Hi, 
 Are you receiving PEC error in those measurements? 
 If initial measurements are not measured then this could be an issue with your wake-up method. 
 You can use PLADC command to make sure conversion is completed. 
 
 Regards

Sgarg · Answer

Hi Gautam, 
 Can you check SPI settings. TMS570LS1224 controllers might have different convention for the settings. 
 The SPI communication required by LTC681x should be 8 bit, Also, can you please try with POL.PHA(0,1) due to different conventions of your uC. A similar issue has been resolved due to these settings.