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ADT7470 数据表(PDF) 8 Page - Analog Devices

部件名 ADT7470
功能描述  Temperature Sensor Hub and Fan Controller
Download  40 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADT7470 数据表(HTML) 8 Page - Analog Devices

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ADT7470
Data Sheet
Rev. E | Page 8 of 40
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
Function
Register Address and Bit
GPIO1
Enable
0x7F [3]
Direction
0x80 [7]
Polarity
0x80 [6]
Status
0x81 [4]
GPIO2
Enable
0x7F [2]
Direction
0x80 [5]
Polarity
0x80 [4]
Status
0x81 [5]
GPIO3
Enable
0x7F [1]
Direction
0x80 [3]
Polarity
0x80 [2]
Status
0x81 [6]
GPIO4
Enable
0x7F [0]
Direction
0x80 [1]
Polarity
0x80 [0]
Status
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.


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