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ZHCSTD7A December 2021 – November 2023 BQ79631-Q1

PRODUCTION DATA

The device has eight GPIOs. Each GPIO can be programmed to be one of the configurations below through the GPIO_CONF1 to GPIO_CONF4 registers.

Table 8-7 GPIO Configuration

GPIO	DISABLE	INPUT		OUTPUT		WEAK PULL-UP/DOWN		SPECIAL
GPIO	High-Z	Digital	ADC Only	High	Low	ADC & weak pull-up	ADC & weak pull-down	SPI Master [SPI_EN] = 1	Fault Input [FAULT_IN_ EN] = 1
GPIO1	√	√	√	√	√	√	√
GPIO2	√	√	√	√	√	√	√
GPIO3	√	√	√	√	√	√	√
GPIO4	√	√	√	√	√	√	√	√ (SS)
GPIO5	√	√	√	√	√	√	√	√ (MISO)
GPIO6	√	√	√	√	√	√	√	√ (MOSI)
GPIO7	√	√	√	√	√	√	√	√ (SCLK)
GPIO8	√	√	√	√	√	√	√		√ (input, active low)

Table 8-8 GPIO Configuration

GPIO Configuration		Description
DISABLE	High-Z	This is the default GPIO configuration at reset if OTP is not programmed
INPUT	Digital	When GPIO is configured as Digital Input, the device detects the input voltage level to determine a 1 or 0 with respect to its V_IL and V_IH levels. The result is shown in the GPIO_STAT register.
INPUT	ADC only	The GPIO is configured to be measurable by the ADC (both main and AUX ADCs) only. Example: use this selection to measurement voltage on GPIO.
OUTPUT	High	The GPIO is configured as digital output high (internally pull up to CVDD). The logic state is also shown in the GPIO_STAT register.
OUTPUT	Low	The GPIO is configured as digital output low. The logic state is also shown in the GPIO_STAT register.
WEAK PULL-UP/DOWN	ADC and Weak Pull-up	The GPIO is pull up internally and is configured to measured by the ADC (both main and AUX ADCs)
WEAK PULL-UP/DOWN	ADC and Weak Pull-down	The GPIO is pull down internally and is configured to measured by the ADC (both main and AUX ADCs)
SPECIAL	SPI Master	When GPIO_CONF1[SPI_EN] = 1, GPIO4 to GPIO7 are taken over as the SPI master communication lines. This configuration has higher priority over any of the INPUT/OUTPUT configurations on GPIO4 to GPIO7.
SPECIAL	Fault Input	When GPIO_CONF1[FAULT_IN_EN] = 1, GPIO8 is taken over as an input that if the GPIO was asserted (active low), will set FAULT_SYS[GPIO] = 1 and assert NFAULT (if enabled).