BQ25882 datasheet(28/86 Pages) TI2

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BQ25883

SLUSDL3A – FEBRUARY 2019 – REVISED APRIL 2019

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ADC conversion operates independently of the faults present in the device. ADC conversion will continue even

after a fault has occurred (such as one that causes the power stage to be disabled), and the host must set

ADC_EN = ‘0’ to disable the ADC. ADC conversion is interrupted upon adapter plug-in, and will only resume until

after Input Source Type Detection is complete. ADC readings are only valid for DC states and not for transients.

When host writes ADC_EN=0, the ADC stops immediately, and ADC measurement values correspond to last

valid ADC reading.

A recommended method to exit ADC conversion is described below:

1. Write ADC_RATE to one-shot, and the ADC will stop at the end of a complete cycle of conversions, or

2. Disable all ADC conversion channels, and the ADC will stop at the end of the current measurement.

8.3.9 Status Outputs

8.3.9.1 Power Good Indicator (PG)

The PG_STAT bit goes HIGH and open drain PG pin goes low to indicate a good input source when:

1. VBUS above VVBUS_UVLO_RISING

2. VBUS below VVBUS_OV threshold

3. VBUS above VPOORSRC (typ. 3.7 V) when IPOORSRC (typ. 30 mA) current is applied (not a poor source)

4. Input Source Type Detection is completed

8.3.9.2 Charging Status Indicator (STAT)

The device indicates charging state on the open drain STAT pin. The STAT pin can drive LED.

Table 7. STAT Pin State

CHARGING STATE

STAT INDICATOR

Charging in progress (including trickle charge, pre-charge, fast-

charge, recharge)

LOW

Charging complete (including top-off)

HIGH

Sleep mode, charge disable

HIGH

Charge suspend (Input over-voltage, TS fault, timer fault or battery

over-voltage)

OTG Buck Mode suspend (due to TS fault)

Blinking at 1Hz

8.3.9.3 Interrupt to Host

In some applications, the host does not always monitor the charger operation. The INT pin notifies the system

host on the device operation. By default, the following events will generate an active-low, 256µs INT pulse.

1. Good input source detected

–

VVBUS < VVBUS_OV threshold

–

VVBUS > VPOORSRC (typ. 3.7 V) when IPOORSRC (typ. 30 mA) current is applied (not a poor source)

2. VBUS_STAT changes state (VBUS_STAT any bit change)

3. Good input source removed

4. Entering IINDPM regulation

5. Entering VINDPM regulation

6. Entering IC junction temperature regulation (TREG)

7. I2C Watchdog timer expired

–

At initial power up, this INT gets asserted to signal I2C is ready for communication

8. Charger status changes state (CHRG_STAT value change), including Charge Complete

9. TS_STAT changes state (TS_STAT any bit change)

10. VBUS over-voltage detected (VBUS_OVP)

11. Junction temperature shutdown (TSHUT)

12. Battery over-voltage detected (BATOVP)

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