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BQ34Z100-G1: The issue of bq76952 and bq34z100 used together.

jmyang
Expert 1151 points
Part Number: BQ34Z100-G1
Other Parts Discussed in Thread: BQ76952, BQ34Z100

Masters of TI,

I met a trouble,

1. My bq34z100-G1 is used with a 52V LFP battery (BMS).

2. The REGIN of bq34z100-G1 is connected to the REG2 (3.3V) of bq76952 AFE.

3. When the battery pack (installed with BMS) is placed (standing) in the 25 ℃ and 55 ℃ thermostats, everything works well.

4. However, when placing (standing) the thermostat at - 20 ℃, it seems that bq34z100-G1 is powered off and then reset,

because I see that StateTime counts again every 60 seconds. In addition, the log data is interrupted every 60 seconds.

Is this possibly caused by the unstable REGIN input power supply of bq34z100-G1?

The 37th pin BREG of bq76952 is connected to D4 (4148 diode). Will this cause the output 3.3V of REG2 to be unstable? 

6545.bq34z100-G1-(-20℃)-No LOAD-Log-2022-11-7.xlsx

  • 0
    TI__Guru* 77343 points

    Hi JM, 

    Have you looked at the REGIN pin (of the BQ76952) on an oscilloscope to see if it is stable when the temperature gets down to -20C? REG2 has a maximum output current of 45 mA - can you measure the current across the 220 Ohm resistor to see if this is increasing at cold temperature?

    Best regards,

    Matt