BQ25882 datasheet(34/86 Pages) TI2

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BQ25883

SLUSDL3A – FEBRUARY 2019 – REVISED APRIL 2019

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Figure 30. Single Read

If the register address is not defined, the charger IC sends back NACK and returns to the idle state.

8.3.14.7 Multi-Write and Multi-Read

The charger device supports multi-read and multi-write of all registers.

Figure 31. Multi-Write

Figure 32. Multi-Read

8.4 Device Functional Modes

8.4.1 Host Mode and Default Mode

The BQ2588x is a host controlled charger, but it can operate in default mode without host management. In

default mode, the device can be used as an autonomous charger with no host or while host is in sleep mode.

When the charger is in default mode, WD_STAT bit is HIGH. When the charger is in host mode, WD_STAT bit is

LOW.

After power-on-reset, the device starts in default mode with watchdog timer expired, or default mode. All the

registers are in the default settings.

In default mode, the device keeps charging the battery with default 12-hour fast charging safety timer. At the end

of the 12-hour, the charging is stopped and the boost converter continues to operate to supply system load.

A I2C write to the registers transitions the charger from default mode to host mode and watchdog timer is reset.

All the device parameters can be programmed by the host. To keep the device in host mode, the host has to

reset the watchdog timer by writing 1 to WD_RST bit before the watchdog timer expires (WD_STAT bit is set), or

disable watchdog timer by setting WATCHDOG bits=00.

BQ25882 Datasheet(PDF) 34 Page - Texas Instruments