Datasheet

USM0

USM1

USM2

nRESET

nSLEEP

GND

ENABLE STEPPER

DIRECTION

STEP

RESET INDEX

3.3 V

J11 J10

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Block Diagram

Figure 3 shows the two connectors and the respective signals for each.

Figure 3. Connectors

USMx: Refer to Table 1 and Table 2 for details on operation.

nRESET: Same as nRESET on the DRV882x device. A LO on this signal places the device into reset with

the H Bridges 3-stated. Refer to the respective device data sheet for further information about the

nRESET signal.

nSLEEP: Same as nSLEEP on the DRV882x device. A LO on this signal places the device into low-power

mode with the H Bridges 3-tated and all logic disabled. Refer to the respective device data sheet for

further information about the nSLEEP signal.

ENABLE STEPPER: A transition from LO to HI commands the microcontroller to enable both DRV882x

devices by asserting the respective ENABLE line for each device. A transition from HI to LO commands

the microcontroller to disable both DRV882x devices by de-asserting the respective ENABLE line for each

device.

DIRECTION: A transition from LO to HI commands the microcontroller to generate microsteps such that

direction of rotation is in the clockwise (or forward) direction. A transition from HI to LO commands the

microcontroller to generate microsteps such that direction of rotation is in the counter-clockwise (or

reverse) direction. Note that stepper rotation is relative to the direction in which the motor is looked at (that

is, from the front or the back of the motor), but also depends on how the motor was wired into the EVM.

Reversing the motor leads often reverses the motor rotation direction.

STEP: A transition from LO to HI commands the microcontroller to generate the next step or microstep.

RESET_INDEX: A transition from LO to HI commands the microcontroller to enter the internal indexer

reset. During reset, the DRV882x devices are disabled (ENABLE is LO). A transition from HI to LO

commands the microcontroller to exit the internal indexer reset. At this point, the internal indexer index is

set to zero, which is the same as angle 0 on the PHASE A sine wave output.

SLMU002–June 2011 DRV882x Evaluation Modules

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