Serial Interface Dual 8-Channel Relay, LED, Stepper Driver


Design files


This reference design includes dual DRV8860 and an MSP430 value line MCU to provide 16-channel low side driver for Relays, LEDs, and Unipolar steppers. The solution suports voltage range from 8V to 38V, 200mA current for each channel, parallel outputs, protection of short condition and open load detection. Serial interface and daisy chain connection of DRV8860 give the most benefits on minimum input IOs and extending the output channels easily. An innovative energizing time and internal automatic PWM duty control provide obvious energy saving function especially for relay and solenoid driving. The PWM duty control also can be used for LED brightness control. Full and half step unipolar stepper motor control logic is also included in this design. The drive stage has integrated protection from short-circuit, under voltage, and over-temperature.

  • Serial interface control to minimize the inputs signal
  • Daisy chain connection to extend output channels easily without increasing inputs IO
  • Wide VM range from 8V to 38V and 200mA for each channel
  • Parallel outputs capability to increase the output current
  • Diagnosis function by reading back output states and OCP/OL faults through serial interface
  • Integrated protection for short-circuit, over-current, under-voltage, and over-temperature
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDU008.PDF (681 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more

TIDC195.ZIP (385 K)

Detailed schematic diagram for design layout and components

TIDR300.PDF (176 K)

Detailed schematic diagram for design layout and components

TIDR301.PDF (104 K)

Complete listing of design components, reference designators, and manufacturers/part numbers


Includes TI products in the design and potential alternatives.

MSP430 microcontrollers

MSP430F235016 MHz MCU with 16KB Flash, 512B SRAM, 10-bit ADC, comparator, UART/SPI/I2C, timer

Data sheet: PDF
Stepper motor drivers

DRV886038-V, 0.3-A, octal low-side motor driver with serial control

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Test report TIDA-00117 Test Results Nov. 15, 2013

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