for other versions of the device. The pin controls available include RST_SHUT, ALERT, CFETOFF, DFETOFF,
DDSG, and DCHG, which are described in detail below.
12.5 Multifunction Pin Controls
The BQ76942 device provides flexibility regarding the multifunction pins on the device, which includes the TS1,
TS2, TS3, CFETOFF, DFETOFF, ALERT, HDQ, DCHG, and DDSG pins. Several of the pins can be used as
active-high outputs with configurable output level. The digital output driver for these pins can be configured
to drive an output powered from the REG1 LDO or from the internal REG18 LDO, and thus when asserted
active-high will drive out the voltage of the selected LDO.
Note: the REG18 LDO is not capable of driving high current levels, so it is recommended to only use this LDO
to provide a digital output if it will be driving a very high resistance (such as > 1 MΩ) or light capacitive load.
Otherwise the REG1 should be powered and used to drive the output signal.
The options supported on each pin include:
ALERT
Alarm interrupt output
HDQ communications
CFETOFF
Input to control the CHG FET (that is, CFETOFF functionality)
DFETOFF
Input to control the DSG FET (that is, DFETOFF functionality)
Input to control both the DSG and CHG FETs (that is, BOTHOFF functionality)
HDQ
HDQ communications
SPI MOSI pin
DCHG
DCHG functionality—a logic-level output corresponding to a fault that would normally cause the CHG driver to be disabled
DDSG
DDSG functionality—a logic-level output corresponding to a fault that would normally cause the DSG driver to be disabled
ALERT, CFETOFF, DFETOFF, HDQ, DCHG, and DDSG
General purpose digital output
Can be driven high or low by command.
Can be configured for an active-high output to be driven from the REG1 LDO or the REG18 LDO.
Can be configured to have a weak pull-down to VSS or weak pullup to REG1 enabled continuously.
ALERT, CFETOFF, DFETOFF, TS1, TS2, TS3, HDQ, DCHG, and DDSG
Thermistor temperature measurement
A thermistor can be attached between the pin and VSS.
ADCIN
The pin can be used for general purpose ADC measurement.
SLUSE14B – DECEMBER 2020 – REVISED DECEMBER 2021
46
Copyright © 2021 Texas Instruments Incorporated
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