Other Parts Discussed in Thread: GPCCEDV
Tool/software:
Hi, TI expert
There is an issue from the customer due to BQ27220YZFR malfunction, so we have an inquiry about how to improve symptoms.
1. symptoms
1) BQ27220YZFR malfunctioning misrepresented % of marked capacity.
2) After storing below -10 degrees, the symptom reproduction rate is high when the device is operating at 0 degrees or more.
3) Normal operation after calibration (register).
4) It is not terminated or booted during booting with 5% or less of the remaining amount, even though it is sufficiently charged with the misrepresentation during discharge (terminal scenario)
5) Charge 100% not displayed. (From the user's point of view, it is judged to be malfunctioning)
6) Provisional customer response in the direction of BQ27220YZFR calibration.
2. Register
- Do not set up a resist at boot time.
→ Read only fuel gauge value
[Calibration Register Settings]
bq27xxx_battery_i2c_write(di, 0x00, 0x14, false);
bq27xxx_battery_i2c_write(di, 0x01, 0x04, false);
bq27xxx_battery_i2c_write(di, 0x00, 0x72, false);
bq27xxx_battery_i2c_write(di, 0x01, 0x36, false);
// wait 2sec
mdelay(2000);
// RESET : i2c write Wr 0x41
bq27xxx_battery_i2c_write(di, 0x00, 0x41, false);
// waite 2sec
mdelay(2000);
// SEAL : i2c write Wr 0x30
bq27xxx_battery_i2c_write(di, 0x00, 0x00, false);
bq27xxx_battery_i2c_write(di, 0x01, 0x30, false);
bq27xxx_battery_i2c_write(di, 0x00, 0x00, false);
3. Other
- BQ25620RYKR + BQ27220YZFR tied to the same I2C.
- In use as Default without OTP Flash.
What will be the problem? Please review the solution.
Please check. Thank you.
