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Techtonics Stepper Motor Driver TECH1022

by Techtonics

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Type of Product :	Stepper Motor Driver
Product ID :	TECH1022
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StepStick DRV8825 Stepper Motor Driver (4-Layer PCB Board)

The DRV8825 stepper motor driver carrier is a breakout board for TI’s DRV8825 microstepping bipolar stepper motor driver. The DRV8825 features adjustable current limiting, over current and over temperature protection, and six micro step resolutions (down to 1/32-step). It operates from 8.2 - 45 V and can deliver up to approximately 1.5 A per phase without a heat sink or forced air flow (rated for up to 2.2 A per coil with sufficient additional cooling).

Key differences between the DRV8825 and A4988

The DRV8825 carrier was designed to be as similar to our A4988 stepper motor driver carriers as possible, and it can be used as a drop in replacement for the A4988 carrier in many applications because it shares the same size, pinout, and general control interface. There are a few differences between the two modules that should be noted, however:

DRV8825 stepper motor driver carrier.

A4988 stepper motor driver carrier, Black Edition

The pin used to supply logic voltage to the A4988 is used as the DRV8825's FAULT output, since the DRV8825 does not require a logic supply (and the A4988 does not have a fault output). Note that it is safe to connect the FAULT pin directly to a logic supply (there is a 1.5k resistor between the IC output and the pin to protect it), so the DRV8825 module can be used in systems designed for the A4988 that route logic power to this pin.

The SLEEP pin on the DRV8825 is not pulled up by default like it is on the A4988, but the carrier board does connect it to the FAULT pin through a 10k resistor. Therefore, systems intended for the A4988 that route logic power to the FAULT pin will effectively have a 10k pull-up on the SLEEP pin. (This 10k resistor is not present on the initial (md20a) version of the DRV8825 carrier.)

The current limit potentiometer is in a different location.

The relationship between the current limit setting and the reference pin voltage is different.

The DRV8825 offers 1/32-step microstepping; the A4988 only goes down to 1/16-step.

The mode selection pin inputs corresponding to 1/16-step on the A4988 result in 1/32-step microstepping on the DRV8825. For all other microstepping resolutions, the step selection table is the same for both the DRV8825 and the A4988.

The timing requirements for minimum pulse durations on the STEP pin are different for the two drivers. With the DRV8825, the high and low STEP pulses must each be at least 1.9 us; they can be as short as 1 us when using the A4988.

The DRV8825 has a higher maximum supply voltage than the A4988 (45 Vvs 35 V), which means the DRV8825 can be used more safely at higher voltages and is less susceptible to damage from LC voltage spikes.

The DRV8825 can deliver more current than the A4988 without any additional cooling (based on our full-step tests: 1.5 A per coil for the DRV8825 vs 1.2 A per coil for the A4988 Black Edition and 1 A per coil for the original A4988 carrier).

The DRV8825 uses a different naming convention for the stepper motor outputs, but they are functionally the same as the corresponding pins on theA4988 carrier, so the same connections to both drivers result in the samestepper motor behavior. On both boards, the first part of the label identifies the coil (so you have coils “A” and “B” on the DRV8825 and coils "1" and "2" on the A4988).

For those with color-sensitive applications, note that the DRV8825 carrier is purple.

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