The controller board holds the Texas Instrument DSP module via a 100-pin DIMM interface. It also offers a number of features designed to make using the OP8665 easier and more flexible.
It allows users to scale 0-16V to 0-3.3V. Analog inputs are scaled using the scaling factor Vo = Vi * ( 1 / 4.74 ), as in this example:
The controller board is powered by the controller interface (OP8665) via the 12V input power supply. It is connected to the interface board through three (3) 40-pin connectors.
Switches and potentiometers let users inject stimulus, a JTAG interface provides access for programming and debugging. The controller board also provides input protection.
|A||Resolver signal calibration potentiometers (3)|
|B||CAN Jumper, to connect or disconnect the CAN to DSP|
|C||Potentiometers, to select controller supply of either a 0V to 3.3V input|
|D||4 push button switches to drive DSP input|
|E||LEDs displaying DSP output|
|F||BOOT selector jumpers. For OPAL-RT technicians’ use or by engineers familiar with TI controller programming.|
JTAG connector for programming or debugging
|H||36 Jumpers for input/output control resolver signal calibration|
ResOffset and ResExc labels are inverted in Version 2.x of 126-0505. Make sure to invert connections as necessary. Failure to do so may result in incorrect results obtained when operating the system.
|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.
|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
|B: CAN jumper settings|
Users can add a 120 Ohm resistor simply by placing the CAN jumper in the ON position, as shown.
|C: Potentiometer settings|
User potentiometers provide 0V to 3.3V output:
|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).
|E: DSP output display LEDs|
Only ON when the voltage is at 0.
|F: BOOT selector jumpers|
Selector Jumpers: these jumpers are reserved for OPAL-RT technicians or engineers who are experienced with Texas Instruments controllers.
|G: JTAG connector|
Allows the user to debug/flash the TI controller.
|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 LEDs||Green when 3.3V power is functioning|