ADT7470 データシートの表示（PDF） - Analog Devices

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ADT7470

Temperature Sensor Hub and Fan Controller

Analog Devices 

ADT7470

Data Sheet

GENERAL-PURPOSE I/O PINS (OPEN DRAIN)

The ADT7470 has four pins that can be configured as either general-purpose logic pins or as PWM outputs. Each GPIO pin has a

corresponding enable, direction, polarity and status bit.

Pin

GPIO1

GPIO2

GPIO3

GPIO4

Function

Enable

Direction

Polarity

Status

Enable

Direction

Polarity

Status

Enable

Direction

Polarity

Status

Enable

Direction

Polarity

Status

Register Address and Bit

0x7F [3]

0x80 [7]

0x80 [6]

0x81 [4]

0x7F [2]

0x80 [5]

0x80 [4]

0x81 [5]

0x7F [1]

0x80 [3]

0x80 [2]

0x81 [6]

0x7F [0]

0x80 [1]

0x80 [0]

0x81 [7]

To enable the PWM output on the ADT7470 as GPIOs, the enable bits in Register 0x7F must be set to 1.

Setting a direction bit to 1 in the GPIO configuration register makes the corresponding GPIO pin an output. Clearing the direction bit to

0 makes it an input.

Setting a polarity bit to 1 makes the corresponding GPIO pin active high. Clearing the polarity bit to 0 makes it active low.

When a GPIO pin is configured as an input, the corresponding bit in the GPIO status register is read-only and is set when the input is

asserted. When a GPIO pin is configured as an output, the corresponding bit in one of the GPIO status registers becomes read/write.

Setting this bit asserts the GPIO output. Note that whether a GPIO pin is configured as an input or as an output, asserted can be high or

low, depending on the setting of the polarity bit.

Rev. E | Page 8 of 40

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