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Maxim MAXREFDES79#四端口IO-Link Master参考设计

来源：中电网

2019-03-08

类别：工业控制

拍明

原标题：Maxim MAXREFDES79#四端口IO-Link Master参考设计

　　Maxim公司的四端口IO-Link Master参考设计MAXREFDES79#包括四个IO-Link Master收发器(MAX14824),降压转换器(MAX15062与MAX17552), STM32F4 ARM Cortex M4微控制器(MCU)和USB连接器,具有灵活和高度集成度,加快产品上市和大大降低IO-Link Master和传感器开发时间,主要用于控制和自动化, IO-Link传感器和激励器.本文介绍了IO-Link Master收发器MAX14824主要特性,功能框图和应用电路,以及参考设计MAXREFDES79#主要特性,框图,电路图和材料清单.

　　The MAX14824 is an IO-Link master interface that integrates an IO-Link physical layer transceiver with an auxiliary digital input and two linear regulators. High port count IO-Link master applications are supported through in-band SPI addressing, and the 12MHz SPI interface minimizes host controller access times. In-band addressing and selectable SPI addresses enable cascading up to 16 devices.

　　The device supports all the IO-Link data rates and features slew-rate-controlled drivers to reduce EMI. The driver is guaranteed to drive up to 300mA (min) load currents. Internal wake-up circuitry automatically determines the correct wake-up polarity, allowing for the use of simple UARTs for wake-up pulse generation.

　　The MAX14824 is available in a 4mm x 4mm, 24-pin TQFN package with exposed pad, and operates over the extended -40NC to +105NC temperature range.

　　MAX14824主要特性:

　　IO-Link v.1.0 and v.1.1 Physical Layer Compliant

　　Supports COM1, COM2, and COM3 Data Rates

　　Push-Pull, High-Side, or Low-Side Outputs

　　300mA C/Q Output Drive

　　1μF C/Q Load Drive Capability

　　Generates 500mA Wake-Up Pulse

　　Automatic Wake-Up Pulse Polarity

　　Auxiliary Digital Input

　　5V and 3.3V Linear Regulators

　　SPI Interface for Configuration and Monitoring

　　SPI-Based Chip Addressing

　　EMI Emission Control Through Slew-Controlled Driver

　　Reverse-Polarity Protection on DI

　　Short-Circuit Protection on C/Q

　　High Temperature Warning and Thermal Shutdown

　　Extensive Fault Monitoring and Reporting

　　-40NC to +105NC Operating Temperature Range

　　4mm x 4mm TQFN Package

　　MAX14824应用:

　　IO-Link Master Controllers

　　PLC Fieldbus Gateways

　　High Port Count IO-Link Masters

　　24V Digital Inputs and Outputs

　　图1. MAX14824功能框图

　　图2. MAX14824应用框图

　　图3. 采用外接电源的MAX14824电路图

　　图4.四个MAX14824应用电路图

　　参考设计MAXREFDES79#

　　The MAXREFDES79# is the world’s first public and fully IO-Link®-compliant, 4-port IO-Link master reference design. This design uses TEConcept’s IO-Link master stack and is both an IO-Link master reference design as well as an IO-Link sensor/actuator development and test system. Four IO-Link ports allow for simultaneous testing of four different sensors (or actuators). Green and RGB LEDs located on the side of the cylindrical enclosure provide power and communication status, respectively. The reference design has four robust female M12 connectors, the most common connector used for IO-Link, and ships with two black IO-Link cables to quickly connect to IO-Link compatible sensors and actuators. An AC-to-DC (24VDC/1A) power-supply cube is capable of providing greater than 200mA simultaneously to each port and greater than four times that amount if the other ports are unused. A Micro-USB connector underneath the enclosure allows for quick connectivity to a Windows® PC. The easy-to-use TEConcept Control Tool (CT) GUI software with IODD file import capability makes the MAREFDES79# a must-have for any company or engineer serious about developing IO-Link products.

　　The MAXREFDES79# IO-Link master consists of 4 main blocks: four IO-Link master transceivers, step-down converters, microcontroller, and USB connection as shown in Figure 6. The MAX14824 IO-Link master transceiver is IO-Link version 1.1/1.0 physical layer compliant with highly integrated 5V and 3.3V linear regulators, configurable outputs (push-pull, high side or low side), auxiliary digital input, 300mA C/Q output drive, and reverse-polarity/short-circuit protection, all in a small 4mm x 4mm, industrial-friendly TQFN package.

　　The MAX15062B is a high-voltage, synchronous step-down converter that efficiently converts 24V to 5V in a tiny 2mm x 2mm, 8-pin TDFN package. The circuit defaults to PWM operation to maintain a constant frequency during all operating loads. Removing resistor R502 will put the MAX15062B into PFM mode. This reference design features optimal efficiency with PWM operation, selecting PFM mode will not provide any benefit.

　　Rather than use a linear regulator to drop 5V to 3.3V, the MAX17552 synchronous step-down converter efficiently converts 5V to 3.3V using a small 3mm x 2mm, 10-pin TDFN package. The MAX17552 circuit is optimized for the smallest component size and a lower input voltage range allowing the use of a 2.95mm x 2.95mm inductor instead of a 4.8mm x 4.8mm inductor. Placing the MAX17552 in series with the MAX15062B allows the MAX17552 to utilize the MAX15062B’s larger input range (up to 60V) while using the smaller inductor. The architecture uses an additional 10mW. If power efficiency is the highest priority in your design, remove resistor R503 to select PFM mode on the MAX17552 to save approximately 3mW of power. The frequency will no longer be fixed in that case.

　　An STM32F4 ARM Cortex M4 microcontroller in a 10mm x 10mm, 64-pin LQFP package provides system control. A universal serial bus (USB) port was implemented using the STM32F4’s internal USB peripheral and STMicroelectronic’s VCP driver.

　　For protection, the MAXREFDES79# features both Schottky and SMA transient voltage suppressor (TVS) diodes at the IO-Link interface. At the power-supply input, a bidirectional SMC TVS diode clamps over- and undervoltages and a Schottky diode provides reverse-polarity protection.

　　参考设计MAXREFDES79#主要特性:

　　Fully IO-Link version 1.1 compliant (downloadable test report)

　　TEConcept IO-Link master stack

　　Easy TEConcept TC tool

　　4 IO-Link ports

　　Power and status LEDs

　　User-friendly enclosure

　　Ships with all cables needed

　　Field update programmable

　　Competitive Advantages

　　World’s first IO-Link master reference design

　　Simultaneous 4-port operation