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Please see the included schematic, parts list, and board layouts I used for implementing motor drivers
with the DRV8818 chip. This board includes header pins for connecting a microprocessor in the future.
Currently I have only populated one of the four circuits to validate the design. I began testing the design
by configuring the I/O pins via the H1 header.
Figure 1 – Schematic for 1 of 4 Motor Drivers
Figure 2 – Header Pins
U1
H1
U5
H2
FAN
C1
R1
C2
R2
C3
C4
J1
J2
Jumper
C5
R3
R4
drv8818
male
female
stepper driver
S2082E-20-ND
S6104-nd
LM340
A19423-ND
A99613-ND
A100453CT-ND
C1608X6S1V224K
ERJ-3GEYJ684V
C1608C0G1H560J
ERJ-3GEYJ684V
C1608C0G1H560J
C1608X6S1V224K
XG8S-0331
XG8S-0331
C1608X6S1V224K
5V 1A regulator
5V fan connector on board
5V fan connector on fan
5V fan wire crimps
5V cooling fan
0.22uF CAP
680kohm
56pF
680kohm
56pF
0.22uF CAP
0.1 spacing male header
0.1 spacing male header
jumper for 0.1 spacing
0.22uF
current sense 0.22ohm 1watt
current sense 0.22ohm 1watt
Part List
Figure 3 – Entire Board Layout
SOT223
603
603
603
603
603
603
603
1206
1206
Figure 4 – Board Layout for Motor Driver 1
Motor connected to the circuit: http://www.interinar.com/public_docs/23KM-K723-23V.pdf
Figure 5 – Motor Diagram
Motor Pin
Pin 6
Pin 4
Pin 3
Pin 1
Board Connection
A1 (Orange)
A2 (Red)
B1 (Blue)
B2 (Yellow)
Table 2 – Motor Wiring
Pre Power Up Verifications:
1) Verified power and ground were not shorted.
2) Verified pins on chip were not shorted, mechanical connection, and electrical connection.
3) Verified shorts did not exist in unexpected locations due to population errors.
I/O Configuration:
1) Vm equal to 15V
2) Vcc equal to 5V
3) SLEEPn equal to 5V
4) USM0 equal to ground
5) USM1 equal to ground
6) ENABLEn equal to ground
7) STEP was left opened and I was planning on connecting it to Vcc to rotate the motor shaft.
8) RESETn equal to 5V
9) SRn equal to ground
10) Vref equal to 3.3V
11) DECAY set equal to 3.3V
12) DIR equal to ground
13) HOME was left opened as it’s to be monitored
Test:
I tried toggling the STEP to 5V to see if the motor would rotate. The motor did not rotate and the shaft
was able to be manually turned.
After the Test:
1) Verified motor windings still had continuity.
2) Verified no visible sign of a damaged component due to heating.
3) Re-verified the schematic and board layout.