DRV8834 Datasheet, PDF (18/30 Pages) Texas Instruments – DUAL BRIDGE STEPPER OR DC MOTOR DRIVER

DRV8834
SLVSB19A – FEBRUARY 2012 – REVISED MARCH 2012
www.ti.com
Phase/Enable Mode Driving a Stepper Motor
Phase/enable mode can be used with a simple interface to a controller to operate a stepper motor in full, half, or
quarter step modes. The decay mode can be set by changing the values of the resistors connected to the
ADECAY and BDECAY pins. The M1 pin is driven to logic high (by connecting to the VINT supply), to allow a
zero-current (off) state when the xENBL pin is set low. Coil current is set by the RSENSE resistors. If the sleep
function is not needed, nSLEEP can be connected to VM with an approximate 47-kΩ resistor.
1 Step
APHASE
BPHASE
AENBL
BENBL
A Current
B Current
Figure 5. Phase/Enable Mode Driving a Stepper Motor
1 Step
APHASE
BPHASE
AENBL
BENBL
A Current
B Current
Figure 6. Full Step Sequence
(2-Phase)
Figure 7. Half Step Sequence
(1-2 Phase)
18
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