DRV8818_15 Datasheet, PDF (16/31 Pages) Texas Instruments – DRV8818 Stepper Motor Controller IC

DRV8818
SLVSAX9D – SEPTEMBER 2011 – REVISED JANUARY 2015
9 Application and Implementation
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NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
The DRV8818 is used for bipolar stepper motor control. The microstepping motor driver provides precise
regulation of the coil current and ensures a smooth rotation from the stepper motor.
9.2 Typical Application
Figure 9 shows a common system application of the DRV8818.
0.1 µF
VCC
10 kŸ
10 kŸ
VCC
10 kŸ
10 kŸ
VCC
100 mŸ _{1 ISENA}
2 _HOMEn
3 _DIR
AOUT1
4 _AOUT1
5 _DECAY
1000 pF
47 kŸ
6 _RCA
7 _GND
8 _VREF
1000 pF 9 _RCB
47 kŸ
10 _VCC
BOUT1 ¹¹ BOUT1
12 _USM1
13 _USM0
100 mŸ _{14 ISENB}
DRV8818
VMA ²⁸
SLEEPn ²⁷
ENABLEn ²⁶
AOUT2 ²⁵
CP2 ²⁴
CP1 ²³
VCP ²²
GND ²¹
VGD ²⁰
STEP ¹⁹
BOUT2 ¹⁸
RESETn ¹⁷
SRn ¹⁶
VMB ¹⁵
VM
0.1 µF
VM
+
100 uF
AOUT2
0.22 µF
VM
0.22 µF
0.22 µF
AOUT1
AOUT2
Stepper Motor
+
±
BOUT2
VM
0.1 µF
Figure 9. Typical Application Schematic
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