ADIS16203SLASHPCBZ datasheet(23/28 Pages) AD

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ADIS16203

Rev. 0 | Page 23 of 28

GENERAL-PURPOSE I/O CONTROL

As previously noted, the ADIS16203 provides two general-purpose,

bidirectional I/O pins (GPIOs) that are available to the user for control

of auxiliary circuits within the target application. All I/O pins are 5 V

tolerant, meaning that the GPIOs support an input voltage of 5 V. Each

GPIO pin has an internal pull-up resistor of approximately 100 kΩ

and a drive capability of 1.6 mA. The direction, as well as the logic

level, can be controlled for these GPIO pins through the GPIO_CTRL

control register, as defined in Table 23.

These same GPIO pins are also controllable through the ALM_CTRL

and MSC_CTRL control registers. The priority for these three control

registers in controlling the two GPIO pins is MSC_CTRL has prece-

dence over ALM_CTRL, which has precedence over GPIO_CTRL.

GPIO_CTRL Register Definition

Address

Default1

Format

Access

0x33, 0x32

0x0000

N/A

R/W

1 Default is valid only until the first register write cycle.

The data within the general-purpose digital I/O control register is

volatile and is set to 0s upon reset.

Table 23. GPIO_CTRL Bit Descriptions

Bit

Description

15:10

Not used

General-Purpose I/O Line 0, Data Direction Control

0: Input

1: Output

General-Purpose I/O Line 1, Data Direction Control

0: Input

1: Output

7:2

Not used

General-Purpose I/O Line 0 Polarity

0: Low

1: High

General-Purpose I/O Line 1 Polarity

0: Low

1: High

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