MAXREFDES64#

MAXREFDES64# Datasheet

MAXREFDES64# System Board

Part	Datasheet
MAXREFDES64#	MAXREFDES64# (pdf)

PDF Datasheet Preview
MAXREFDES64# System Board Page 1 of 6 Enlarge+ Introduction The MAXREFDES64# reference design features 8-channel digital inputs with isolated power and data. The design integrates a 600VRMS data isolator MAX14850 a STM32F1 microcontroller a FTDI USB-UART bridge a high-efficiency DC-DC converter MAX17515 and isolated/regulated +24V and +5V power rails MAX17498C . The entire system typically operates at less than 140mW and fits into a space roughly the size of a credit card. A block diagram of the system is shown in Figure Page 2 of 6 Figure The MAXREFDES64# 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 Table Power Requirement for the MAXREFDES64# Reference Design Power Type On-board isolated power Input Voltage V 24 Input Current mA, typ Note STM32 and FTDI are powered by USB separately. The MAX31913 U500 is an octal digital input serializer. The ultra-efficient MAX17498C U102 generates the isolated +24V, 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 MAXREFDES64# uses the on-board STM32F1 microcontroller to communicate with the octal digital input serializer. The user can read the digital inputs status through a terminal program. The simple process flow is shown in Figure The firmware is written in C using the Keil µVision5 tool. Page 3 of 6 Figure The MAXREFDES64# 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: • PC with a USB port • MAXREFDES64# board • 24V power supply Procedure The reference design is fully assembled and tested. Follow the steps to verify board operation: Always disconnect and reconnect the USB cable before using the terminal program. Turn off, or keep off, the 24V power supply. The MAXREFDES64# 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 Connect the negative terminal of the 24V power supply to the PGND connector on the MAXREFDES64# board. Connect the positive terminal of the 24V power supply to the +24V connector on the MAXREFDES64# board. Turn on the 24V power supply. Connect the USB cable from the PC to the MAXREFDES64# board. Open Hyperterminal or a 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 . The MAXREFDES64# software will display a menu Figure For immediate signal testing, connect the positive terminal of the 24V voltage source to any digital input terminal DI_FIN1 to DI_FIN8 of the J500 and J501 terminal blocks. Pay close attention and avoid connecting 24V to the ground terminals. Since the digital input terminals and the ground terminals alternate on the terminal block and are so close to each other, special care must be taken. Press 0 in the terminal program to start the continuous read mode. Verify that the digital value read hex and binary matches the digital input status of J500 and J501 terminal blocks. Page 4 of 6 Figure Terminal program main menu. Lab Measurements Figure 4 and Figure 5 show the digital inputs of hex value 0x55 and also the result read by the Terminal program. Page 5 of 6 Figure Test setup. Figure Test outputs. Reference

PDF Datasheet Preview

MAXREFDES64# System Board

Page 1 of 6

Enlarge+

Introduction

The MAXREFDES64# reference design features 8-channel digital inputs with isolated power and data. The design integrates a 600VRMS data isolator MAX14850 a STM32F1 microcontroller a FTDI USB-UART bridge a high-efficiency DC-DC converter MAX17515 and isolated/regulated +24V and +5V power rails MAX17498C . The entire system typically operates at less than 140mW and fits into a space roughly the size of a credit card. A block diagram of the system is shown in Figure

Page 2 of 6

Figure The MAXREFDES64# 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

Table Power Requirement for the MAXREFDES64# Reference Design

Power Type On-board isolated power

Input Voltage V 24

Input Current mA, typ

Note STM32 and FTDI are powered by USB separately.

The MAX31913 U500 is an octal digital input serializer.

The ultra-efficient MAX17498C U102 generates the isolated +24V, 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 MAXREFDES64# uses the on-board STM32F1 microcontroller to communicate with the octal digital input serializer. The user can read the digital inputs status through a terminal program. The simple process flow is shown in Figure The firmware is written in C using the Keil µVision5 tool.

Page 3 of 6

Figure The MAXREFDES64# 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:
• PC with a USB port
• MAXREFDES64# board
• 24V power supply

Procedure

The reference design is fully assembled and tested. Follow the steps to verify board operation:

Always disconnect and reconnect the USB cable before using the terminal program.

Turn off, or keep off, the 24V power supply. The MAXREFDES64# 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 Connect the negative terminal of the 24V power supply to the PGND connector on the MAXREFDES64# board. Connect the positive terminal of the 24V power supply to the +24V connector on the MAXREFDES64# board.

Turn on the 24V power supply. Connect the USB cable from the PC to the MAXREFDES64# board. Open Hyperterminal or a 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 . The MAXREFDES64# software will display a menu Figure For immediate signal testing, connect the positive terminal of the 24V voltage source to any digital input terminal DI_FIN1 to DI_FIN8 of the J500 and J501 terminal blocks. Pay close attention and avoid connecting 24V to the ground terminals. Since the digital input terminals and the ground terminals alternate on the terminal block and are so close to each other, special care must be taken. Press 0 in the terminal program to start the continuous read mode. Verify that the digital value read hex and binary matches the digital input status of J500 and J501 terminal blocks.

Page 4 of 6

Figure Terminal program main menu.

Lab Measurements

Figure 4 and Figure 5 show the digital inputs of hex value 0x55 and also the result read by the Terminal program.

Page 5 of 6

Figure Test setup.

Figure Test outputs. Reference

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived MAXREFDES64# Datasheet file may be downloaded here without warranties.

Datasheet ID: MAXREFDES64# 647478