Texas Instruments Evaluation Module for the DRV8829 DRV8829EVM DRV8829EVM Datenbogen
Produktcode
DRV8829EVM
USM0
USM1
USM2
nRESET
nSLEEP
GND
GND
ENABLE STEPPER
DIRECTION
STEP
RESET INDEX
3.3 V
J11
J10
Block Diagram
shows the two connectors and the respective signals for each.
Figure 3. Connectors
USMx: Refer to
and
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.
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.
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.
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.
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.
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.
5
SLMU002
–
June 2011
DRV882x Evaluation Modules
Copyright
©
2011, Texas Instruments Incorporated