User Interface
5
SLAU675 – February 2016
Copyright © 2016, Texas Instruments Incorporated
DRV10964 Evaluation Module
5
User Interface
5.1
Jumpers
Descriptions for the jumpers are provided in the following list:
•
FR:
Motor direction selector. Upon start-up, the DRV10964 device spins the motor in the direction
indicated by the FR input pin. The direction of commutation is as described in the following table.
Connection
Direction Description
VCC – FR
U
→
W
→
V
GND – FR
U
→
W
→
V
•
CMTMOD:
The FGS pin is used to configure the output of the FG pin. Based on the configuration of
the FGS pin and the frequency of FG (FG_FREQ), the motor speed is calculated as shown in the
following table.
Connection
Description
VCC – FR
RPM = (FG_FREQ × 60 ×3) / Number of pole pairs
GND – FGS
RPM = (FG_FREQ × 60) / Number of pole pairs
5.2
PWM Configuration With the TLC555 Timer
The PWM signal is generated with circuitry based on TI’s TLC555 low-power timer. PWM is generated
based on input from the potentiometer. The PWM signal generated by the circuitry on the EVM is
approximately 25 kHz and is adjustable from 5% to 95% duty cycle using the potentiometer (
R5
). External
PWM input can be applied to test point PWMIN by removing resistor R6.
Figure 2. PWM Configuration for DRV10964 EVM
