Click here for production status of specific part numbers. Evaluates: MAX14870, MAX14872 MAX14870 Evaluation Kit General Description Quick Start The MAX14870 evaluation kit (EV kit) is a fully assembled Recommended Equipment and tested circuit board that evaluates the MAX14870 full- MAX14870 EV kit bridge DC motor driver. 100kHz function generator The EV kit can also be used to evaluate the MAX14872. 24V, 2A power supply Features 3.3V, 100mA power supply Operates from a Wide 4.5V to 36V Supply DC brushed motor Standalone or Software-Controlled Operation Procedure Proven PCB Layout The EV kit is fully assembled and tested. Follow the steps Fully Assembled and Tested below to verify board operation before exercising the full features of the device: PMOD Compatible Connector 1) Verify that all the jumpers are in their default posi- tions, as shown in Table 1. 2) Connect the 24V supply to the VDD test point (TP8) and the ground test point (TP5) on the EV kit. 3) Connect one wire of the the motor to the J3 terminal Ordering Information appears at end of data sheet. block (M1). 4) Connect the other wire of the motor to the J3 terminal block (M2). 5) Connect the oscilloscope to the M1 test point (TP11), the M2 test point (TP12), and the PWM test point (TP3). 6) Connect DIR (TP2) to ground. 7) Turn on the 24V power supply. 8) Using the function generator, connect a 0V to 3V, 10kHz switching signal to the PWM test point (TP3). 9) Monitor M1, M2, and PWM. 10) Change the duty cycle on the PWM input to increase/ decrease the speed of the motor. 19-7698 Rev 2 10/19Evaluates: MAX14870, MAX14872 MAX14870 Evaluation Kit High-Voltage Transient Protection Detailed Description of Hardware The EV kit includes pads for two diodes, D1 and D2. The MAX14870 EV kit is a fully tested circuit board dem- These diodes are not required during normal operation, onstrating the capabilities of the MAX14870 motor driver. but can be added for protection against high-voltage tran- Current Regulation sients during short-circuit events. A 100m resistor is connected between COM and ground Fault Indicator LED for current regulation. To disable current regulation, place The FAULT output is connected to the 3.3V logic supply a shunt on the J1 jumper and connect J4 to 23 to con- through R4. A fault is generated when an overcurrent nect COM and SNS, respectively, to ground. condition occurs on M1 and/or M2. LED1 turns on during Current Sensing a fault condition. Connect the J4 jumper to 12 to monitor the motor current NOTE: To ensure that LED1 turns on during a short-circuit during operation when J1 is open. event, use a power supply capable of supply at least 6A when testing short-circuit functionality. Table 1. Jumper Descriptions JUMPER SHUNT POSITON DESCRIPTION Open* COM is connected to ground through a 100m resistor. J1 Closed COM is connected to ground. 1-2* SNS is connected to COM. J4 2-3 SNS is connected to ground. Current regulation is disabled. *Default position. Ordering Information PART TYPE MAX14870EVKIT EV Kit Denotes RoHS compliant. Maxim Integrated 2 www.maximintegrated.com