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Original question:

BQ25886: The Power path not working correctly when battery is not connected.

BQ25883: Battery Detection By BQ25883

Nimesh Rana
Intellectual 470 points
Part Number: BQ25883
Other Parts Discussed in Thread: BQ25886

Hello Team,

We have one requirement for the 2 cell battery charging with battery detection.
We are planning to use bq25886/bq25883, but doubt for the battery detection functionality.
 
1) Can you please check and suggest, is it possible to use suggested IC for the battery detection also, instead of adding complex circuit, if yes than how?
2) Can we use datasheet suggested register bit (IBIT_DISCHG) for taking decision of battery present or not by polling method or reading by I2C?
3) If I follow this configuration with BQ25883,
 
Charger Control 2 Register (Address = 06h) ---> EN_CHG bit is set to 0 (charging disable)
ADC Control Register (Address = 15h) ---> ADC_EN bit is set to 1 (adc enabled)
 
Considering the above mentioned scenario, If a Battery is not connected to VBAT terminal then What would be the value of VBAT ADC Registers(Address 1Dh and 1Eh) ? Please confirm.
VBAT ADC 1 Register (Address = 1Dh) ---> Read-only value of VBAT voltage reading MSB part
VBAT ADC 0 Register (Address = 1Eh) ---> Read-only value of VBAT voltage reading LSB part
Please suggest your input as early as possible.
Regards,

Nimesh Rana 

  • 0
    TI__Mastermind 41675 points

    Dear Nimesh,

    We do not have battery detection directly. However, the IBAT_DISCHG can be used to detect a battery. By enabling this bit a 11.5 mA current source is enabled on the battery pin. After this enabled, you would observe how quickly the battery voltage drops using I = C dV/dT. The larger the capacitance, the longer it will take to discharge this pin. A longer time would indicate a battery is connected. You would need some software to be able to realize this however.

    Thanks,

    Mike Emanuel

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