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ADT7470 数据表(PDF) 8 Page - Analog Devices |
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ADT7470 数据表(HTML) 8 Page - Analog Devices |
8 / 40 page 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. |
类似零件编号 - ADT7470_15 |
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类似说明 - ADT7470_15 |
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