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POLOLU DRV8834 LOW-VOLTAGE STEPPER
MOTOR DRIVER CARRIER
USER'S GUIDE
USING THE DRIVER
Minimal wiring diagram for connecting a microcontroller to a DRV8834
stepper motor driver carrier (1/4-step mode).
POWER CONNECTIONS
The driver requires a motor supply voltage of 2.5-10.8 V to be connected across
VMOT and GND. This supply should have appropriate decoupling capacitors close to
the board, and it should be capable of delivering the expected stepper motor current.
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https://eckstein-shop.de/
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Summary of Contents for Eckstein komponente POLOLU DRV8834
- Page 1 POLOLU DRV8834 LOW-VOLTAGE STEPPER MOTOR DRIVER CARRIER USER’S GUIDE USING THE DRIVER Minimal wiring diagram for connecting a microcontroller to a DRV8834 stepper motor driver carrier (1/4-step mode). POWER CONNECTIONS The driver requires a motor supply voltage of 2.5-10.8 V to be connected across VMOT and GND.
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Page 2: Motor Connections
Warning: This carrier board uses low-ESR ceramic capacitors, which makes it susceptible to destructive LC voltage spikes, especially when using power leads longer than a few inches. Under the right conditions, these spikes can exceed the 11.8 V maximum voltage rating for the DRV8834 and permanently damage the board, even when the motor supply voltage is as low as 9 V. -
Page 3: Control Inputs
Microstep Resolution Full step High Half step Floating 1/4 step High 1/8 step High High 1/16 step Floating High 1/32 step CONTROL INPUTS Each pulse to the STEP input corresponds to one microstep of the stepper motor in the direction selected by the DIR pin. These inputs are both pulled low by default through internal 200 kΩ... - Page 4 The DRV8834 also features a FAULT output that drives low whenever the H-bridge FETs are disabled as the result of over-current protection or thermal shutdown, or while the undervoltage lockout is disabling the chip. The carrier board connects this pin to the SLEEP pin through a 10k resistor that acts as a FAULT pull-up whenever SLEEP is externally held high, so no external pull-up is necessary on the FAULT pin.
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Page 5: Current Limiting
CURRENT LIMITING To achieve high step rates, the motor supply is typically higher than would be permissible without active current limiting. For instance, a typical stepper motor might have a maximum current rating of 1 A with a 5 Ω coil resistance, which would indicate a maximum motor supply of 5 V. -
Page 6: Schematic Diagram
POWER DISSIPATION CONSIDERATIONS The DRV8834 driver IC has a maximum continuous current rating of 1.5 A per coil, and in our tests, this carrier board was capable of supplying the rated current for many minutes without requiring additional cooling. The DRV8834 can support peak currents of up to 2.2 A per coil, but its overcurrent protection might kick in at currents as low as 2 A, and the actual current you can deliver depends on how well you can keep the IC cool. - Page 7 Schematic diagram for the DRV8834 low-voltage stepper motor driver carrier. KEY DIFFERENCES BETWEEN THE DRV8825 AND A4988 The DRV8834 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.
- Page 8 A4988 stepper motor driver carrier, DRV8834 low-voltage stepper motor Black Edition (shown with original green driver carrier. 50 mΩ current sense resistors). The pin used to supply logic voltage to the A4988 is used as the DRV8834’s FAULT output, since the DRV8834 does not require a logic supply (and the A4988 does not have a fault output).
- Page 9 The pins on the DRV8834 carrier corresponding to the A4988 carrier’s MS3 and RESET pins are disconnected by default. If electrical compatibility with the A4988 carrier is not a concern, two different signals (CONFIG and VREF) on the DRV8834 carrier can be connected to these pins with surface mount jumpers (described in the “Optional pin jumpers”...
- Page 10 Alternative minimal wiring diagram for connecting a microcontroller to a DRV8834 stepper motor driver carrier (1/4-step mode). https://eckstein-shop.de/...
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