AMC7832 Datasheet, PDF (38/70 Pages) Texas Instruments – AMC7832 12-Bit Analog Monitor and Control Solution with Multi-Channel ADC, Bipolar DACs, Temperature Sensor and GPIO Ports

AMC7832
SLAS836 – MARCH 2014
www.ti.com
8.3.5 General Purpose I/Os
The AMC7832 includes eight General Purpose I/O (GPIO) terminals, each with an internal 48-kΩ pull-up resistor
to IOVDD. The GPIO[0-3] terminals have dual functionality and can be programmed as either bidirectional digital
I/O terminals or interrupt signals in the GPIO Configuration register (address 0x12). The GPIO[4-7] terminals are
dedicated GPIOs.
Table 4. Dual Functionality GPIO Pins
PIN
DEFAULT PIN NAME
ALTERNATIVE PIN NAME
ALTERNATIVE FUNCTIONALITY
9
GPIO0
ALARMIN
DAC clear control signal.
10
GPIO1
ALARMOUT
Global alarm output.
11
GPIO2
ADCTRIG
External ADC conversion trigger.
12
GPIO3
DAV
ADC data available indicator.
The GPIOs can receive an input or produce an output. When the GPIO acts as an output its status is determined
by the corresponding GPIO bit in the GPIO Register (address 0x7A).
To use a GPIO terminal as an input, the corresponding GPIO bit in the GPIO Register must be set to '1'. When a
GPIO terminal acts as input, the digital value on the terminal is acquired by reading the corresponding GPIO bit.
After a power-on reset or any forced reset, all GPIO bits are set to '1', and the GPIO terminals have a 48-kΩ
input impedance to IOV_DD.
GPIOn Bit
(when writing)
IOVDD
48kŸ
ENABLE
GPIOn
GPIOn Bit
(when reading)
Figure 52. AMC7832 GPIO Pin
38
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