ADAU1761BCPZ-R7 datasheet(48/92 Pages) AD

48 / 92 page

Data Sheet

ADAU1761

GENERAL-PURPOSE INPUT/OUTPUT

analog.com

Rev. F | 48 of 92

The serial data input/output pins (Pin 26 to Pin 29) are shared with

the general-purpose input/output function. Each of these four pins

can be set to only one of these functions. The function of these pins

is set in the serial data/GPIO pin configuration register (Register

R60, Address 0x40F4).

The GPIOx pins can be used as inputs or outputs. These pins are

readable and can be set through the control port or directly by the

SigmaDSP core. When configured as inputs, the GPIOx pins can

be used with push-button switches or rotary encoders to control

DSP program settings. These pins can also be used with digital

outputs to drive LEDs or external logic to indicate the status of

internal signals and control other devices. Examples of this use

include indicating signal overload, signal present, and button press

confirmation.

When configured as an output, each GPIO pin can typically drive 2

mA, which is enough current to directly drive some high efficiency

LEDs. Standard LEDs require about 20 mA of current and can be

driven from a GPIO output with an external transistor or buffer.

Because of problems that can arise from simultaneously driving or

sinking a large amount of current on many pins, avoid connecting

high efficiency LEDs directly to many or all of the GPIO pins when

designing the application.

If many LEDs are required, use an external driver. When the GPIO

pins are configured as open-collector outputs, they should be pulled

up to a maximum voltage equal to the voltage set on IOVDD.

The configuration of the GPIO functions is set up in the GPIO pin

control registers (Register R48 to Register R51, Address 0x40C6 to

Address 0x40C9).

GPIO PINS SET FROM THE CONTROL PORT

The GPIO pins can also be configured to be directly controlled

from the I2C/SPI control port. When the pins are set to this mode,

four memory locations are enabled for the GPIO pin settings. The

physical settings on the GPIO pins mirror the settings of the LSB of

these 4-byte-wide memory locations.

Table 32. GPIOx Pin Memory Settings (Set from Control Port)

Memory Location

Bits[31:1]

Bit 0

Decimal

Hex

1568

0x0620

Reserved

GPIO0SET

1569

0x0621

Reserved

GPIO1SET

1570

0x0622

Reserved

GPIO2SET

1571

0x0623

Reserved

GPIO3SET

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