Tool/software:
Team,
Posting on behalf of my customer.
I have a question regarding the configuration recommendation for DSG FET Protection A in the BQ7695202 technical reference manual ( TRM )
We are using the BQ7695202 and are trying to configure it to turn off the D-FET when it detects the SCD protection.
During testing, we noticed that the device was taking around ~250ms to turn of the D-FET despite the SCD delay being configured for 200us.
Upon further investigation, we found that the issue was with “DSG FET Protection A” register configuration. The TI technical note recommends using 0X80 or 0XE4 as values to this register, thus we used 0x80 earlier, which enables only SCD protection to turn off D-FET.
But, configuring 0x80 would still introduce 250ms delay in turning off DSG-FET. When the register configuration is changed to 0XE4, the delay issue was resolved and we could see the D-FET turn off at 200us as programmed.
We’re using IC with the code “BQ7695202 3AWG4AYGF” and I’m referring to the latest TRM from the site BQ76952 Technical Reference Manual (Rev. B).
We are using a master microcontroller to program the IC through I2C protocol.
We are trying to understand, why there’s an additional 250ms delay in turning off the DSG FET when the “DSG FET Protection A “ register is programmed with 0x80 value as recommended by the TRM???
Thanks for your insight.
Tom
