Hardware Overview
2012 Microchip Technology Inc.
DS52080A-page 23
2.2.10
The Matrix Board Interface
The matrix board interface facilitates the following functions:
• Connects the appropriate signals to the correct pins on the Plug-In Module (PIM)
• Disconnects signals and provides isolation on signal paths that, in a particular
hardware configuration, are not being used
The matrix board header has two rows of pins. One row (pins 1-25) hosts signals from
different signal sources, the other (pins 26-50) hosts connections to the PIM.
is a block diagram that describes the matrix board interface.
FIGURE 2-2:
MATRIX BOARD BLOCK DIAGRAM
2.2.10.1
INTERNAL AND EXTERNAL OP AMP MATRIX BOARDS
The dsPICDEM MCLV-2 Development Board uses discrete op amps (U5) to amplify the
shunt resistor signals. Alternatively, some PIC24 MCUs or dsPIC DSCs are designed
with op amps on-board that can be used for this purpose. To accommodate these two
basic configurations, the dsPICDEM MCLV-2 Development Board includes two matrix
boards.
• The Internal Op Amp Configuration Matrix Board configures the development
board to use op amps that are internal to the PIC24 MCU or dsPIC DSC. This
matrix board bypasses the current feedback circuitry on the dsPICDEM MCLV-2
Development Board and directly connects the shunt resistor signals to appropriate
pins of the PIM.
• The External Op Amp Configuration Matrix Board configures the development
board to use the current feedback circuitry on the dsPICDEM MCLV-2 Develop-
ment Board. This matrix board disconnects the shunt resistor signals from the PIM
pins and connects the current feedback circuitry output to the appropriate PIM
pins.
Shunt resistor signals (Direct)
Reconstructed motor neutral voltage
Feedback signals (Hall sensor/
DC bus voltage
Potentiometer
Matrix
PIM
Board
Phase voltage/Shunt resistor)
Note:
Unless specified in the PIM information sheet, all PIMs are compatible only
with the External Op amp Configuration matrix board. Certain PIMs are
designed to work only with the Internal Op amp Configuration matrix
boards. In this case, the corresponding PIM information sheet (available at
www.microchip.com/pims
) will explicitly state this.
