MAX14874EVKIT# Analog Devices

Evaluates: MAX14874 MAX14874 Evalution Kit General Description Quick Start The MAX14874 evaluation kit (EV kit) is a fully assembled Recommended Equipment and tested circuit board that evaluates the MAX14874 MAX14874 EV kit dual relay/valve/motor driver 24V, 2A power supply The EV kit operates from a single 4.5V to 36V supply and 50kHz function generator features an on-board linear regulator to generate a 3.3V logic supply. A terminal block allows for easy connections DC brushed motor to evaluate operation with relays, valves, and/or motors. Procedure Features The EV kit is fully assembled and tested. Follow the steps below to verify board operation before exercising the full Operates from a Wide 4.5V to 36V Supply features of the device: Proven PCB Layout 1) Verify that all the jumpers are in their default positions, Fully Assembled and Tested as shown in Table 1. 2) Connect the EN1 jumper (J5) to 1-2, so the M1 driver Ordering Information appears at end of data sheet. is enabled. 3) Connect the 24V DC power supply on the VDD and GND connectors on the EV kit board. 4) Connect the DC brushed motor to the M1 and GND terminals on the J8 connector. 5) Set the function generator to output a 0V3.3V 50kHz signal. 6) Remove the shunt on the J3 jumper and connect the function generator to the IN1 test point (TP3). 7) Turn on the 24V supply. 8) Turn on the function generator. 319-100031 Rev 0 6/17Evaluates: MAX14874 MAX14874 Evalution Kit Fault Indicator LED Detailed Description The FAULT output asserts low when an overcurrent The MAX14874 EV kit is a fully tested circuit board condition exists on M1 or M2 or when the device goes demonstrating the capabilities of the MAX14874 relay/ into thermal shutdown. The on-board LED (DS1) turns valve/motor driver. on when FAULT asserts. The LED turns off when FAULT On-Board LDO deasserts. The MAX15006A (U1) on-board LDO generates 3.3V Monitoring the M1/M2 Current for the logic supply (VL). Close the J2 jumper to use the Both COM1 and COM2 are connected to GND through MAX15006 to power VL. 100m resistors, for easy current monitoring. Connect To use an external supply for VL, open the J2 jumper and a scope probe to the COM1 or COM2 pins (or on the J7 connect the external supply to pin 2 of the jumper. header) to monitor the current through the driver. Table 1. Jumper Descriptions JUMPER SHUNT POSITON DESCRIPTION Open VL is open. J2 Closed* VL is connected to the MAX15006A circuit. VL is 3.3V. 1-2 IN1 is connected to VL. J3 2-3* IN1 is connected to GND. 1-2 IN2 is connected to VL. J4 2-3* IN2 is connected to GND. 1-2 EN1 is connected to VL. M1 driver is enabled. J5 2-3* EN1 is connected to GND. M1 driver is disabled. 1-2 EN2 is connected to VL. M2 driver is enabled. J6 2-3* EN2 is connected to GND. M2 driver is disabled. Open* COM1 is not connected to COM2. J7 Closed COM1 is connected to COM2. *Default position. Maxim Integrated 2 www.maximintegrated.com