3.5 Examples of Connection to Host Controller
3-29
3
Wi
ring and
C
onne
ctio
n
• Precaution when host controller uses open collectors with customer-supplied power.
The multi-winding drive unit may malfunction depending on the relationship between
the pull-up voltage (Vcc) and the pull-up resistance (R1).
Before wiring, confirm that the specifications of the host controller satisfy the values
shown in the following table.
Pull-up voltage (Vcc)
Pull-up resistance (R1)
24 V
1.8 k
Ω
to 2.7 k
Ω
12 V or less
820
Ω
to 1.5 k
Ω
5 V or less
180
Ω
to 470
Ω
Circuit example of open-controller output
Multi-winding drive unit
VF = 1.5 V to 1.8 V
Vcc
Tr1
VF
R1
i
Host controller
150
Ω
4.7 k
Ω
Pull-up