Data Sheet

DRV8825
www.ti.com SLVSA73F –APRIL 2010–REVISED JULY 2014
6 Pin Configuration and Functions
Pin Functions
PIN
EXTERNAL COMPONENTS
I/O
(1)
DESCRIPTION
OR CONNECTIONS
NAME NO.
POWER AND GROUND
CP1 1 I/O Charge pump flying capacitor
Connect a 0.01-μF 50-V capacitor between CP1 and CP2.
CP2 2 I/O Charge pump flying capacitor
GND 14, 28 — Device ground
Connect a 0.1-μF 16-V ceramic capacitor and a 1-MΩ resistor to
VCP 3 I/O High-side gate drive voltage
VM.
VMA 4 — Bridge A power supply Connect to motor supply (8.2 to 45 V). Both pins must be
connected to the same supply, bypassed with a 0.1-µF capacitor
VMB 11 — Bridge B power supply
to GND, and connected to appropriate bulk capacitance.
Bypass to GND with a 0.47-μF 6.3-V ceramic capacitor. Can be
V3P3OUT 15 O 3.3-V regulator output
used to supply VREF.
CONTROL
AVREF 12 I Bridge A current set reference input Reference voltage for winding current set. Normally AVREF and
BVREF are connected to the same voltage. Can be connected to
BVREF 13 I Bridge B current set reference input
V3P3OUT.
Low = slow decay, open = mixed decay,
DECAY 19 I Decay mode high = fast decay.
Internal pulldown and pullup.
DIR 20 I Direction input Level sets the direction of stepping. Internal pulldown.
MODE0 24 I Microstep mode 0
MODE0 through MODE2 set the step mode - full, 1/2, 1/4, 1/8/
MODE1 25 I Microstep mode 1
1/16, or 1/32 step. Internal pulldown.
MODE2 26 I Microstep mode 2
NC 23 — No connect Leave this pin unconnected.
Logic high to disable device outputs and indexer operation, logic
nENBL 21 I Enable input
low to enable. Internal pulldown.
Active-low reset input initializes the indexer logic and disables the
nRESET 16 I Reset input
H-bridge outputs. Internal pulldown.
Logic high to enable device, logic low to enter low-power sleep
nSLEEP 17 I Sleep mode input
mode. Internal pulldown.
Rising edge causes the indexer to move one step. Internal
STEP 22 I Step input
pulldown.
STATUS
nFAULT 18 OD Fault Logic low when in fault condition (overtemp, overcurrent)
(1) Directions: I = input, O = output, OD = open-drain output, IO = input/output
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