bq24160, bq24161
bq24163, bq24168
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SLUSAO0A –NOVEMBER 2011–REVISED MARCH 2012
Battery Discharge FET (BGATE)
The bq2416x contains a MOSFET driver to drive the gate of an external discharge FET between the battery and
the system output. This external FET provides a low impedance path when supplying the system from the
battery. Connect BGATE to the gate of the external discharge MOSFET. BGATE is on under the following
conditions:
1. No input supply connected.
2. HZ_MODE = 1
3. CD pin connected high
DEFAULT Mode
DEFAULT mode is used when I2C communication is not available. DEFAULT mode is entered in the following
situations:
1. When the charger is enabled and VBAT< VBATGD before I2C communication is established
2. When the watchdog timer expires without a reset from the I2C interface and the safety timer has not expired.
3. When the device comes out of any fault condition (sleep mode, OVP, faulty adapter mode, etc.) before I2C
communication is established
In DEFAULT mode, the I2C registers are reset to the default values. The 27-minute safety timer (no timer for
bq24168) is reset and starts when DEFAULT mode is entered. The default value for VBATREG is 3.6V, and the
default value for ICHARGE is 1A. The input current limit for the IN input is set to 1.5A. The input current limit for the
USB input is determined by the D+/D– detection (bq24160/3) or PSEL (bq24161/8). PSEL and D+/D– detection
have no effect on the IN input. Default mode is exited by programming the I2C interface. Once I2C
communication is established, PSEL has no effect on the USB input. Note that if termination is enabled and
charging has terminated, a new charge cycle is NOT initiated when entering DEFAULT mode.
Copyright © 2011–2012, Texas Instruments Incorporated
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Product Folder Link(s): bq24160 bq24161 bq24163 bq24168
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