DRV8811_15 Datasheet, PDF (21/32 Pages) Texas Instruments – DRV8811 Stepper Motor Controller IC

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11 Layout
DRV8811
SLVS865I – SEPTEMBER 2008 – REVISED JANUARY 2015
11.1 Layout Guidelines
The VMA and VMB pins should be bypassed to GND using low-ESR ceramic bypass capacitors with a
recommended value of 0.1 μF rated for VM. This capacitor should be placed as close to the VMA and VMB pins
as possible with a thick trace or ground plane connection to the device GND pin.
The VMA and VMB pins must be bypassed to ground using an appropriate bulk capacitor. This component may
be an electrolytic and should be located close to the DRV8811.
A low-ESR ceramic capacitor must be placed in between the CP1 and CP2 pins. TI recommends a value of 0.22
μF rated for VM. Place this component as close to the pins as possible.
A low-ESR ceramic capacitor must be placed in between the VM and VCP pins. TI recommends a value of 0.22
μF rated for 16 V. Place this component as close to the pins as possible.
Ensure proper connection of the DRV8811 PowerPAD to the PCB. The PowerPAD should be connected to a
copper plane that is connected to GND. The copper plane should have a large area to allow for thermal
dissipation from the DRV8811.
11.2 Layout Example
GND
GND
100 PŸ
VCC
100 PŸ
ISENA
HOMEn
DIR
AOUT1
DECAY
RCA
GND
VREF
RCB
VCC
BOUT1
USM1
USM0
ISENB
GND
GND
VMA
SLEEPn
ENABLE
AOUT2
CP2
CP1
VCP
GND
VGD
STEP
BOUT2
RESETn
SRn
VMB
0.1 µF
VM
0.22 µF
0.22 µF
0.22 µF
GND
VM
0.1 µF
Figure 14. Layout Example Schematic
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