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BQ76952: DDSG output is abnormal

Toad F
Prodigy 40 points
Part Number: BQ76952

Tool/software:

When using DDSG, there is still a voltage of 0.6V when a low level is required. After BQ7652 was powered off and then back on, DDSG returned to normal. The internal configuration's pull-up source is REG1, configured at 3.3V.
At DDSG 0.6V, it was also found that the temperature of the external voltage reducing transistor for REG1 was very high. After resetting BQ76952, it also returned to normal.

At DDSG 0.6V,
At the same time, it was found that the collected values of NTC would fluctuate between 25/37 ℃.
Can you help me clarify what caused this situation? How has it been handled?

  • 0
    TI__Genius 17795 points

    Hello Toad,

    Just to double-check, can you share what the DDSG configuration is? Was DDSG reading 0.6V when the device was powered off? Are you using an NTC on the DDSG pin? Do you have a schematic you can share as well?

    Best Regards,
    Alexis

  • 0 in reply to Alexis_H
    Prodigy 40 points

    Hello Alexis,

    I am using a low side design scheme. DDSG is configured to map DSG functionality, not NTC functionality. There is no problem with the configuration of DDSG. After resetting, the high level is 3.3V and the low level is 0V. The following image shows the waveform after resetting BQ76952. When the DDSG reaches 0.6V, BQ76952 is still working normally, with normal communication and voltage reading, but the temperature value keeps fluctuating.

  • 0 in reply to Toad F
    TI__Genius 17795 points

    Hello Toad,

    Do you mind sharing a schematic of the circuitry around the DDSG pin and the NTC?

    Best Regards,
    Alexis