PAC1721 datasheet(57/92 Pages) MICROCHIP

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DS-20007088A-page 57

PAC1721

SMBUS_SETTINGS (ADDRESS 12H)

R/W-0

R-0

R/W-1

R/W-0

U-0

R/W-0

GPIO_DATA1

GPIO_DATA0

ANY_ALERT

POR

TIMEOUT

BYTE_COUNT

–

I2C_HISPEED

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as 0

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

X = Bit is unknown

This register is used to activate the SMBus functionality. It is also used to store I/O data for R/W on I/O pins.

Bits in this register can be written or read at any time and are active immediately.

A Refresh (any) command is not required to activate the settings or update the register.

bit 7

GPIO_DATA1: R/W data for pin A1. GPIO/ALERT function if pin A1 is configured as GPIO pin.

If the A1 pin is configured as a GPIO input, then 0b = low and 1b = high.

For more details on how to configure pin A1 as GPIO pin, see Register 6-2.

Note 1: To write to this bit, the A1 pin must be set as GPIO output pin, else PAC1721 ignores the

Write command.

2: When pin A1 is selected as ALERT pin, this bit becomes read-only.

3: While the default for this bit is 0b, the hardware setup impacts its initial value. For example,

if pin A1 is externally pulled high, the initial value of the GPIO_DATA1 bit upon reading is 1b.

4: When pin A1 is not configured as GPIO output, the input value is stored in this bit. This

includes when pin A1 is connected to the VDD, SDA, SCL or GND pin.

0b = Pulls the A1 pin low when configured to be a GPIO output (default).

1b = Pulls the A1 pin high to the external pull-up voltage using an external resistor when the A1 pin is

configured as GPIO output.

bit 6

GPIO_DATA0: R/W data for pin A0. GPIO/ALERT function if pin A0 is configured as GPIO pin.

If the A0 pin is configured as a GPIO input, then 0b = low and 1b = high.

For more details on how to configure pin A0 as GPIO pin, see Register 6-2.

Note 1: To write to this bit, the A1 pin must be set as GPIO output pin, else PAC1721 ignores the

Write command.

2: When pin A0 is selected as ALERT pin, this bit becomes read-only.

3: While the default for this bit is 0b, the hardware setup impacts its initial value. For example,

if pin A0 is externally pulled high, the initial value of the GPIO_DATA0 bit upon reading is 1b.

4: When pin A0 is not configured as GPIO output, the input value is displayed in this bit. This

includes when pin A0 is connected to the VDD, SDA, SCL or GND pin.

0b = Pulls the A0 pin low when configured to be a GPIO output (default).

1b = Pulls the A0 pin high to the external pull-up voltage using an external resistor when the A0 pin is

configured as GPIO output.

bit 5

ANY_ALERT: This bit is set when any active alert triggers, except for the Conversion Complete alert.

Clearing the alert that set the ANY_ALERT bit also clear the bit. For more details, see Section 4.10.1.

0b = No ALERT condition occurred.(default)

1b = An ALERT condition occurred.

PAC1721 Datasheet(PDF) 57 Page - Microchip Technology

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