XinaBox OC06 Stepper Driver Stepper Module for DRV8825, PCA9685

xChip Boards

xChips are a rapid electronics development ecosystem to help reduce development time and simplify making custom products as well as aiding learning. Without soldering, wiring, breadboarding, or hardware knowledge you can assemble a circuit in minutes, and concentrate on coding.

xChips are compatible with the platform you want to use and bridges are available for the most popular pltatforms; Raspberry Pi, Minnowboard, Beaglebone, Micro:bit, Pixhawk and 96 boards. Rather than bridging to Ardunio, we offer compatible cores for Arduino Uno, the CC01, and for Arduino Zero, the CC03.

xChips utilise I2C, and due to this bus architecture, unlimited expansion of circuits is possible. Limitations of I2C addresses have been negated by development multiplexers.

Because of its simple connection method, it is easy to build quickly - for prototyping and small product runs

xChips connect to each other using an xBus connector, available from RS 174-4977.

Some xChips need an xPDI connector (RS 174-4974) to connect to programming interfaces, such as the IP02 or IP03.

OC06 – Stepper Driver xChip (DRV8825, PCA9554A

This xChip is an output control module, based on the PCA9554A by Texas Instruments, which is an 8-bit I/O expander for the two-line bidirectional bus (I²C).

On this xChip, the PCA9554A drives the control signals of a DRV8825 Stepper Motor Controller. The PCA9554A accepts control commands through the I²C interface which provide the control signals to the DRV8825.

The DRV8825 provides an integrated motor driver solution for printers, scanners, and other automated equipment applications. The OC06 has one H-bridge driver and a microstepping indexer, and is intended to drive a bipolar stepper motor.

This xChip is capable of driving an individual stepper motor only. When more than one stepper motor is required, the physical address of the PCA9554A can be changed by soldering the I²C address selection pads.

Product Features

● Stepper motor controller/driver
● Connects a single stepper via screw terminals
● External motor supply input via screw terminal (Max 47 V)
● 2.5 A continuous motor output current
● Built-in microstepping indexer
● Up to 1/32 microstepping

Applications

● Robotics
● Precision control
● Accurate positional control systems
● CNC machines

DRV8825 Specifications

● PWM microstepping stepper motor driver:
● Built-in microstepping indexer
● Up to 1/32 microstepping
● Multiple decay modes:
● Mixed decay
● Slow decay
● Fast decay
● 2.5 A maximum drive current at 24 V
● Low current sleep mode

Protection features:
● Overcurrent protection (OCP)
● Thermal shutdown (TSD)
● VM undervoltage lockout (UVLO)
● Fault condition indication pin (nFAULT)

PCA9554A Specifications

● 400 kHz Fast I²C bus
● Three hardware address pins allow up to eight I²C addresses
● Internal power-on reset
● No glitch on power up
● Latched outputs with high-current drive

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