3.5 Examples of Connection to Host Controller
3-29
• 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 kΩ to 2.7 kΩ
12 V or less 820 Ω to 1.5 kΩ
5 V or less 180 Ω to 470 Ω
Circuit example of open-controller output
Multi-winding drive unit
V
F = 1.5 V to 1.8 V
Vcc
Tr1
V
F
R1
i
Host controller
150 Ω
4.7 kΩ
Pull-up
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