DRV8842 Datasheet, PDF (3/18 Pages) Texas Instruments – DC MOTOR DRIVER IC

DRV8842
www.ti.com
SLVSAB8D – MAY 2010 – REVISED JANUARY 2012
Table 1. TERMINAL FUNCTIONS
NAME
PIN
POWER AND GROUND
GND
14, 28
VM
4, 11
V3P3OUT
15
CP1
1
CP2
2
VCP
3
CONTROL
IN1
21
IN2
20
I0
23
I1
24
I2
25
I3
26
I4
27
DECAY
19
nRESET
nSLEEP
VREF
STATUS
nFAULT
OUTPUT
ISEN
OUT1
OUT2
16
17
12,13
18
6, 9
5, 10
7, 8
I/O ⁽¹⁾
DESCRIPTION
-
Device ground
-
Bridge A power supply
O
3.3-V regulator output
IO
Charge pump flying capacitor
IO
Charge pump flying capacitor
IO
High-side gate drive voltage
I
Input 1
I
Input 2
I
I
I
Current set inputs
I
I
I
Decay mode
I
Reset input
I
Sleep mode input
I
Current set reference input
OD
Fault
IO
Bridge ground / Isense
O
Bridge output 1
O
Bridge output 2
EXTERNAL COMPONENTS
OR CONNECTIONS
Connect to motor supply (8.2 - 45 V). Both
pins must be connected to same supply.
Bypass to GND with a 0.47-μF, 6.3-V ceramic
capacitor. Can be used to supply VREF.
Connect a 0.01-μF 50-V capacitor between
CP1 and CP2.
Connect a 0.1-μF 16-V ceramic capacitor to
VM.
Logic input controls state of OUT1. Internal
pulldown.
Logic input controls state of OUT2. Internal
pulldown.
Sets winding current as a percentage of
full-scale. Internal pulldown.
Low = slow decay, open = mixed decay,
high = fast decay. Internal pulldown and
pullup.
Active-low reset input initializes the logic and
disables the H-bridge outputs. Internal
pulldown.
Logic high to enable device, logic low to enter
low-power sleep mode. Internal pulldown.
Reference voltage for winding current set.
Both pins must be connected together on the
PCB.
Logic low when in fault condition (overtemp,
overcurrent)
Connect to current sense resistor. Both pins
must be connected together on the PCB.
Connect to motor winding. Both pins must be
connected together on the PCB.
Connect to motor winding. Both pins must be
connected together on the PCB.
(1) Directions: I = input, O = output, OZ = tri-state output, OD = open-drain output, IO = input/output
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