Datasheet
DRV8812
www.ti.com
SLVS997F –OCTOBER 2009–REVISED AUGUST 2013
Table 1. TERMINAL FUNCTIONS
PIN
EXTERNAL COMPONENTS
NAME I/O
(1)
DESCRIPTION
OR CONNECTIONS
PWP RHD
POWER AND GROUND
GND 14, 28 3, 17 - Device ground
VMA 4 7 - Bridge A power supply
Connect to motor supply (8 - 45 V). Both pins
must be connected to same supply.
VMB 11 14 - Bridge B power supply
Bypass to GND with a 0.47-μF 6.3-V ceramic
V3P3OUT 15 18 O 3.3-V regulator output
capacitor. Can be used to supply VREF.
CP1 1 4 IO Charge pump flying capacitor
Connect a 0.01-μF 50-V capacitor between
CP1 and CP2.
CP2 2 5 IO Charge pump flying capacitor
Connect a 0.1-μF 16-V ceramic capacitor and
VCP 3 6 IO High-side gate drive voltage
a 1-MΩ resistor to VM.
CONTROL
AENBL 21 24 I Bridge A enable Logic high to enable bridge A
APHASE 20 23 I Bridge A phase (direction) Logic high sets AOUT1 high, AOUT2 low
AI0 24 27 I
Sets bridge A current: 00 = 100%,
Bridge A current set
01 = 71%, 10 = 38%, 11 = 0
AI1 25 28 I
BENBL 22 25 I Bridge B enable Logic high to enable bridge B
BPHASE 23 26 I Bridge B phase (direction) Logic high sets BOUT1 high, BOUT2 low
BI0 26 1 I
Sets bridge B current: 00 = 100%,
Bridge B current set
01 = 71%, 10 = 38%, 11 = 0
BI1 27 2 I
Low = slow decay, open = mixed decay,
DECAY 19 22 I Decay mode
high = fast decay
Active-low reset input initializes internal logic
nRESET 16 19 I Reset input
and disables the H-bridge outputs
Logic high to enable device, logic low to enter
nSLEEP 17 20 I Sleep mode input
low-power sleep mode
AVREF 12 15 I Bridge A current set reference input Reference voltage for winding current set.
Can be driven individually with an external
DAC for microstepping, or tied to a reference
BVREF 13 16 I Bridge B current set reference input
(e.g., V3P3OUT). A 0.01-µF bypass capacitor
to GND is recommended.
STATUS
Logic low when in fault condition (overtemp,
nFAULT 18 21 OD Fault
overcurrent)
OUTPUT
ISENA 6 9 IO Bridge A ground / Isense Connect to current sense resistor for bridge A
ISENB 9 12 IO Bridge B ground / Isense Connect to current sense resistor for bridge B
AOUT1 5 8 O Bridge A output 1
Connect to motor winding A
AOUT2 7 10 O Bridge A output 2
BOUT1 10 13 O Bridge B output 1
Connect to motor winding B
BOUT2 8 11 O Bridge B output 2
(1) Directions: I = input, O = output, OZ = tri-state output, OD = open-drain output, IO = input/output
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