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User Interfaces
11
User Interfaces
The AM572x IDK EVM contains GPIO expanders that provide industrial inputs and outputs to support
development. The outputs contain LEDs for immediate feedback. There are also tri-color LEDs connected
to GPIOs to support development.
11.1 Tri-color LEDs
There are 6 tri-color LEDs connected to SOC GPIO pins that can be used to support development. There
is a separate GPIO assigned for each color: red, green, and yellow. Color mixing by turning on more than
one GPIO at a time will not provide the expected result since the separate colors have different intensities
due to the physics of the LED composition. Tri-color LEDs D16, D17, D18, and D19 are designated
Industrial LEDs. Tri-color LEDs D22 and D23 are designated Status LEDs.
11.2 Industrial Inputs
For industrial 24v digital inputs, an SN65HVS882 Digital-input Serializer for industrial digital inputs is used
to accept standard signals from the 30-pin (15 × 2) I/O Expansion Header, J37. The input values are
clocked into the SPI3 port of the AM5728 processor.
11.3 Industrial Outputs / LEDs
I2C to 8-bit LED driver TPIC2810 is used to drive the eight Industrial output LEDs D5 to D12. The I2C
interface is connected to the I2C1 port of the AM5728 processor along with the other devices on the
IND_I2C bus. The eight LED driver outputs are also driven to the I/O Expansion Header, J37. All the LEDs
are green in color.
12
Pin Use Description
12.1 Functional Interface Mapping
Some signals of the AM5728 device are connected to a fixed device on the EVM where it cannot be
changed. However, some of the signals of the AM5728 device are connected to devices on the AM572x
IDK EVM based on the profile setting.
12.2 GPIO Pin Mapping
The developer can enable GPIO pins individually, as needed, as output, input, or both. Most of the
LVCMOS pins not currently allocated for other peripheral use can be defined as GPIO pins.
compliment to the schematic and the recommended settings in the pinmux tool. Each of the defined GPIO
pins are listed along with the associated pin name and ball number and mode. The last column lists the
available physical pull-up (PU) or pull-down (PD) resistor attached or the recommended internal pull-up or
pull-down resistor defined in the pinmux file provided for the AM572x IDK EVM.
22
AM572x Industrial Development Kit (IDK) Evaluation Module (EVM) Hardware
Copyright © 2017–2019, Texas Instruments Incorporated
Table 5
SPRUI64E – May 2017 – Revised September 2019
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