DRV8846_15 Datasheet, PDF (4/35 Pages) Texas Instruments – DRV8846 Dual H-Bridge Stepper Motor Driver

DRV8846
SLLSEK2 – JUNE 2014
NAME
VINT
VM
VREF
PIN
NO.
17
15
14
Pin Functions (continued)
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I/O
DESCRIPTION
— Internal regulator
PWR Power supply
I
Full-scale current reference
input
Internal supply voltage; bypass to GND with 2.2-μF, 6.3-V capacitor
Connect to motor power supply; bypass to GND with a 0.1- and 10-μF
(minimum) ceramic capacitor rated for VM
Voltage on this pin sets the full scale chopping current; short to VINT
if not supplying an external reference voltage
Table 1. External Components
Component
C_VM
C_VM
C_VINT
R_nFAULT
R_AISEN
R_BISEN
Pin 1
VM
VM
VINT
VCC ⁽¹⁾
AISEN
BISEN
Pin 2
GND
GND
GND
nFAULT
GND
GND
Recommended
10-µF (minimum) ceramic capacitor rated for VM
0.1-µF ceramic capacitor rated for VM
6.3-V, 2.2-µF ceramic capacitor
>5 kΩ
Sense resistor, see applications section for sizing
Sense resistor, see applications section for sizing
(1) VCC is not a pin on the DRV8846, but a VCC supply voltage pullup is required for open-drain output nFAULT; nFAULT may be pulled
up to VINT through a resistor R_nFAULT
4
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