Description

Low Power Wiring Guidelines

The generic 23-pin I/O assignments illustrated below are described in Table 2. This is the wiring

diagram configuration shown in Figure 5. Most inputs and outputs (I/O) can be configured through

parameter settings to operate as a digital switch input, an analog input, or in one case a 12 V power

supply. The alternative uses are listed in Table 2 and further details in the type Tables 4–13.

Rotor Position feedback (Pins 12, 16, 17, 18)

All four wires (+5 V, Feedback A, Feedback B, and I/O ground) should be bundled together as they

run between the motor and controller logic connector. These can often be run with the rest of the low

current wiring harness. The encoder cables should not be run near the motor cables. In applications

where this is necessary, shielded cable should be used with the ground shield connected to the I/O

ground (pin 12) at only the controller side. In extreme applications, common mode filters (e.g. ferrite

beads) could be used.

CANbus (Pins 13 and 20)

It is recommended that the CAN wires be run as a twisted pair. However, many successful applications

at 250 kbit/s are run without twisting, simply using two lines bundled in with the rest of the low

current wiring. The CANbus wiring should be kept away from the high current cables and cross

them at right angles when necessary.

All other low power wiring

The remaining low power wiring should be run according to standard practices. When designing

the vehicle’s wiring and routing, keep the input lines such as throttle, temperature, and the above

mentioned motor feedback signals separate from controller’s output lines such as the coil driver

outputs. Avoid routing the low-power wiring parallel to the high power (and current) battery and

motor cables.

Protected voltages

The low-power pins’ protected voltage ratings listed in Table 3 are absolute and therefore are not

intended for normal operation. To prevent damage to the controller, do not connect (short circuit)

the Coil Return (pin 2) to battery negative. Further, do not connect (short circuit) the I/O Ground

(pin 12) to battery positive.

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