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A: Resolver Offset potentiometer

The Controller Board provides a Resolver circuit. The Resolver circuit can be calibrated via two potentiometers and the signals can be probed via test points.

RV3: used to adjust the Resolver SIN and COS signal offsets. The offset voltage can be measured by probing R-TP1.  In general, offset should be adjusted to in-between signal to avoid clipping at the output.

R-TP1: used to adjust 0.5-3.3V (adjustment in RV3 provides 1.5V on R-TP1).

R-TP2: used to probe SIN offset value.  Amplitude measured at R-TP2 should be between 0.1V and 2.3V for correct operation.

R-TP3: used to probe COS offset value.  Amplitude measured at R-TP3 should be between 0.1V and 2.3V for correct operation.

Resolver Offset potentiometer

A: Resolver Excitation calibration potentiometer

RV4: used to adjust the resolver excitation signal’s voltage amplitude.

R-TP4 is used to probe the excitation signal output of the Resolver Circuit.

Signal will saturate around ±5.5V

Resolver Excitation calibration potentiometer

B: CAN jumper settings

Users can add a 120 Ohm resistor simply by placing the CAN jumper in the ON position, as shown.

CAN jumper settings

C: Potentiometer settings

User potentiometers provide 0V to 3.3V output:

  • POT1 is used for ADC_A5
  • POT2 is used for ADC_B5

Potentiometer settings

D: DSP switches

The user switches SW1 to SW4. These switches are Normally Open and pulled-up to 3.3V. Press and hold to obtain 0 V (release to return to 3.3 V).

  • SW1 – GPIO59
  • SW2 – GPIO58
  • SW3 – GPIO61
  • SW4 – GPIO60

DSP switches

E: DSP output display LEDs

Only ON when the voltage is at 0.

  • LED1 -> GPIO62
  • LED2 -> GPIO63

DSP output display LEDs

F: BOOT selector jumpers

Selector Jumpers: these jumpers are reserved for OPAL-RT technicians or engineers who are experienced with Texas Instruments controllers.

Jumper IDSignal

BOOT selector jumpers

G: JTAG connector

Allows the user to debug/flash the TI controller.


JTAG connector

H: Input/output jumpers

Jumpers allow users to insert a short or leave the circuit open, as needed.

Each jumper controls a specific channel, identified at each jumper on the board (see image opposite).

I: Power LEDsGreen when 3.3V power is functioning