PS810 datasheet(21/46 Pages) MICROCHIP

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DS21904C-page 21

PS810

6.0

GPIO CONFIGURATION

6.1

Configuring Inputs and Outputs

GPIOs can be set up to act as inputs or outputs that are

based on conditions involving battery data parameters,

or GPIO levels, compared to constants. This powerful

programming model allows for customizing GPIO to set

on any possible fuel gauge conditions and reset on any

other possible fuel gauge conditions in any groupings.

Four parameters define the global behavior of each pin

as follows:

• GPIOSTATE: defines the state, high or low, the

GPIO is in during initialization of the fuel gauge.

• GPIODIRECTION: Defines whether the GPIO is

an input or an output.

• GPIOCONFIG: enables analog functions NTC

and VCOIN vs. GPIO (high byte), enables pull-up

or pull-down on inputs (low byte).

• GPIOPOLARITY: defines active and inactive

polarities. All GPIOs will drive high to VBAT,

except for IO0 and IO3, which will drive high to

VBAT – 1 volt. All GPIOs have pull-ups and pull-

downs when configured as inputs, except IO0 and

IO3, which only have pull-downs. IO0 is only

available in SPS mode and IO3 is only available

when not using VCOIN. Similarly, IO2 is only

available when not using NTC.

TABLE 6-1:

GPIO PARAMETERS

TABLE 6-2:

PARAMETER NUMBER/GPIO NUMBER CORRESPONDENCE

Name

Definition

Bit Description

GPIOSTATE

Reset State

of GPIO

Bit number corresponds to GPIO number bit setting:

bit (x) = 1: GPIO defaults to high

bit (x) = 0: GPIO defaults to low

GPIODIRECTION

GPIO Input

or Output

Bit number corresponds to GPIO number bit setting:

bit (x) = 1: GPIO is an input

bit (x) = 0: GPIO is an output

GPIOCONFIG High Byte

Analog or

GPIO

bit (5) = 1: Pin 1 is NTC thermistor input

bit (5) = 0: Pin 1 is GPIO

bit (4) = 1: Pin 2 is VCOIN coin cell input

bit (4) = 0: Pin 2 is GPIO

bit (0) = 1: Disable pull-up and pull-down resistors on inputs

bit (0) = 0: Enable pull-up and pull-down resistors on inputs

GPIOCONFIG Low Byte

Pull-up or

Pull-down on

Inputs

If GPIO is configured as input, then:

bit (7-2):

= Pull-down

= Pull-up

bit (1-0):

= 1.8V communication

= TTL communication

GPIOPOLARITY

Default and

Active

Polarity

Bit number corresponds to GPIO number bit setting:

bit (x) = 1: GPIO is default high, active-low

bit (x) = 0: GPIO is default low, active-high

Parameter Bit #

GPIO #

00/SCL

SDA/SPS

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