Datasheet

DRV8841
www.ti.com SLVSAC0E –MAY 2010–REVISED AUGUST 2013
Table 1. TERMINAL FUNCTIONS
EXTERNAL COMPONENTS
NAME PIN I/O
(1)
DESCRIPTION
OR CONNECTIONS
POWER AND GROUND
GND 14, 28 - Device ground
VMA 4 - Bridge A power supply
Connect to motor supply (8.2 - 45 V). Both
pins must be connected to same supply.
VMB 11 - Bridge B power supply
Bypass to GND with a 0.47-μF 6.3-V ceramic
V3P3OUT 15 O 3.3-V regulator output
capacitor. Can be used to supply VREF.
CP1 1 IO Charge pump flying capacitor
Connect a 0.01-μF 50-V capacitor between
CP1 and CP2.
CP2 2 IO Charge pump flying capacitor
Connect a 0.1-μF 16-V ceramic capacitor and
VCP 3 IO High-side gate drive voltage
a 1-MΩ resistor to VM.
CONTROL
Logic input controls state of AOUT1. Internal
AIN1 21 I Bridge A input 1
pulldown.
Logic input controls state of AOUT2. Internal
AIN2 20 I Bridge A input 2
pulldown.
AI0 24 I Sets bridge A current: 00 = 100%,
Bridge A current set 01 = 71%, 10 = 38%, 11 = 0
AI1 25 I
Internal pulldown.
Logic input controls state of BOUT1. Internal
BIN1 22 I Bridge B input 1
pulldown.
Logic input controls state of BOUT2. Internal
BIN2 23 I Bridge B input 2
pulldown.
BI0 26 I Sets bridge B current: 00 = 100%,
Bridge B current set 01 = 71%, 10 = 38%, 11 = 0
BI1 27 I
Internal pulldown.
Low = slow decay, open = mixed decay,
DECAY 19 I Decay mode high = fast decay. Internal pulldown and
pullup.
Active-low reset input initializes internal logic
nRESET 16 I Reset input and disables the H-bridge outputs. Internal
pulldown.
Logic high to enable device, logic low to enter
nSLEEP 17 I Sleep mode input
low-power sleep mode. Internal pulldown.
AVREF 12 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 I Bridge B current set reference input
(e.g., V3P3OUT).
STATUS
Logic low when in fault condition (overtemp,
nFAULT 18 OD Fault
overcurrent)
OUTPUT
ISENA 6 IO Bridge A ground / Isense Connect to current sense resistor for bridge A
ISENB 9 IO Bridge B ground / Isense Connect to current sense resistor for bridge B
AOUT1 5 O Bridge A output 1
Connect to motor winding A
AOUT2 7 O Bridge A output 2
BOUT1 10 O Bridge B output 1
Connect to motor winding B
BOUT2 8 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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