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Maxim Integrated - 8-Channel Digital Output Micro PLC Card MAXREFDES63#

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Maxim Integrated - 8-Channel Digital Output Micro PLC Card MAXREFDES63#
SKU: MD-01162
PKR 6,700.00
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Availability: In stock

MAX14850, MAX14900E, MAX17498C, MAX17515 - Interface, Digital Isolator Evaluation Board



Industry 4.01 marks the fourth industrial revolution, characterized by distributed, intelligent control systems. Breaking from a past with large, centralized programmable-logic controllers, Industry 4.0 allows for highly configurable, highly modular factories, which accept an ever increasing number of sensor inputs, while operating at a higher output than ever before. The ultra-small PLC, or MicroPLC, lies at the heart of the Industry 4.0 factory, providing high performance with ultra-low power consumption, in an ultra-small package. MAXREFDES63# is Maxim Integrated’s Micro PLC octal-channel, digital output card.

The MAXREFDES63# reference design (Figure 1) features eight-channel digital outputs with isolated power and data. The design integrates a 600VRMS data isolation (MAX14850); a STM32F1 microcontroller; a FTDI USB-UART bridge; a high-efficiency DC-DC converter (MAX17515); and isolated/regulated +22V, and +5V power rails (MAX17498C). The entire system typically operates at less than 400mW and fits into a space roughly the size of a credit card.

Figure 1. The MAXREFDES63# reference design block diagram.


  • Isolated power and data
  • Micro PLC form factor
  • Device drivers
  • Example C source code


  • Industrial control and automation
  • Process control
  • PLC

Detailed Description of Hardware

The power requirement is shown in Table 1.

Table 1. Power Requirement for the MAXREFDES63# Reference Design

Power TypeInput Voltage (V)Input Current (mA, typ)
On-board isolated power 24 15 (All LEDs on) + Load Current

Note: STM32 and FTDI are powered by USB separately.

The MAX14900 (U400) is an octal power switch with per-channel configuration feature.

The ultra-efficient MAX17498C (U102) generates the isolated +22V, and +5V rails from a 24V supply. The MAX14850 (U301) digital data isolators provide data isolation. The combined power and data isolation achieved is 600VRMS.

The MAX17515 (U101) step-down DC-DC converter converts the +5V supply from the USB to +3.3V and powers the STM32 (U1) microcontroller and FTDI (U201) USB-UART bridge.

Detailed Description of Firmware

The MAXREFDES63# uses the on-board STM32F1 microcontroller to communicate with the octal power switch. The user enters configuration data through a terminal program and the digital outputs will be updated. The simple process flow is shown in Figure 2. The firmware is written in C using the Keil µVision5 tool.

Figure 2. The MAXREFDES63# firmware flowchart.

The complete source code is provided to speed up customer development. Code documentation can be found in the corresponding firmware platform files.

Quick Start

Required equipment:

  • Windows® PC with a USB port
  • MAXREFDES63# board
  • 24V power supply


The complete source code is provided to speed up customer development. Code documentation can be found in the corresponding firmware platform files.

  1. Turn off or keep off the 24V power supply.
  2. The MAXREFDES63# utilizes the FTDI USB-UART bridge IC. If Windows cannot automatically install the driver for the FTDI USB-UART bridge IC, the driver is available for download from
  3. Connect the negative terminal of the 24V power supply to the PGND connector on the MAXREFDES63# board. Connect the positive terminal of the 24V power supply to the +24V connector on the MAXREFDES63# board.
  4. Turn on the 24V power supply.
  5. Connect the USB cable from the PC to the MAXREFDES63# board.
  6. Open Hyperterminal or similar Terminal program on the PC. Find the appropriate COM port, usually a higher number port, such as COM4, or COM6, and configure the connection for 921600, n, 8, 1, none (flow control).
  7. The MAXREFDES63# software will display a menu (Figure 3)
  8. Press any key in the terminal program to start the output configuration.
  9. Enter the Configuration Byte in hex format.
  10. Enter the desired output data in hex format.
  11. Verify the output status by observing the 8 green LEDs under connectors J400 and J401 on the board. These LEDs are connected to the digital outputs of the card.

Terminal program main menu.
Figure 3. Terminal program main menu.

Lab Measurements

Figure 4 and Figure 5 shows the status of the LEDs with the output configuration byte set to 0xFF and the output data byte set to 0xAA.

Test setup.
Figure 4. Test setup.

Test outputs.
Figure 5. Test outputs.

Additional Information

Additional Information

Part Number MAXREFDES63#
Manufacturer Maxim Integrated

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