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10
Industrial Interfaces
There are additional industrial interfaces implemented on the AM571x IDK EVM to help showcase the
flexibility of the AM57xx line of processors.
10.1 Profibus
A compliant Profibus interface is implemented using the ISO1176T isolation device, transformer and
TPS76650 LDO regulator. This circuit terminates to a DB9F connector, J14. This Profibus interface is
driven by UART0 from the first PRU-ICSS block, PR1.
10.2 DCAN
The AM5718 processor contains two Controller Area Network (DCAN) interfaces. DCAN port 1 is routed
out to the ISO1050 isolation device and then to the 5-pin header, J38. The R1Z-3.305HP isolated DC-DC
supply provides an isolated 3.3V supply for this DCAN interface.
10.3 RS-485
The AM571x IDK EVM contains an RS-485 interface on 3-pin header, J39. This is enabled by the
SN65HVD78D Half-Duplex RS-485 Transceiver. The transceiver controls the half-duplex communication
and also provides high-voltage transient protection. This interface is attached to the SOC-level UART2
port for RX and TX data. The UART TX data line is monitored by PR2_PRU1, so that PRU code can
monitor TX activity and then control the DE and REn lines into the transceiver.
11
User Interfaces
The AM571x 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 AM5718 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 AM5718 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.
SPRUI97A – May 2017
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AM571x Industrial Development Kit (IDK) Evaluation Module (EVM)
Copyright © 2017, Texas Instruments Incorporated
Industrial Interfaces
21
Hardware
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