Hi Sir,
We have purchased the pre-production version of BQ76952 and designed a 10S configured BMS. We are all set for One Time Programming.
And we've tried OTP in a chip. As we have serial configuration, the following options were changed from the default configurations in BQstudios,
- Turning on the Body diode protection bit,
- Changing the Cell count,
But, when we connected a charger or a load across PACK+ and PACK - pins there was no reaction in circuit i.e, neither charging nor discharging action was not performed by the BMS.
When we are testing with the sub-commands like ALL_FETS_ON, ALL_FETS_OFF or other FET related sub-commands there was no change in the voltage across the CHG and DSG FETs. But all other sub commands are working.
- Always the potential difference across the CHG pin and GND remains 46.74 V approx (Battery pack voltage = 35.74 V; Charge pump Voltage = 11 V).
- Always the potential difference across the DSG pin and GND remains 35.74 V approx.
- Source to GND voltage of both FETs remains 32 V approx.
Q1. What may be the possible problem we are facing. Why and How to solve it ?
Q2. Is there any procedure to be followed while providing sub-commands to the device ? (The device was in full access mode while providing these Sub-commands)
Q3. Why no charge or discharge is happening in our circuit ?
Q4. Is there any problem with the IC when FUSE bit shows HIGH in 10th bit of Battery status register ?
Q5. Is there any procedure to properly switch off the device ?
Here, the schematic of the circuit is attached.
Thank you
