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dsPIC33CK Low-Voltage Motor Control Board User’s Guide
DS50002927A-page 38
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2020 Microchip Technology Inc.
3.2.7 External Temperature Sensor Interface
The Motor Control Board provides an optional external temperature sensor interface
circuit. This circuit can be used to interface a thermistor for measuring motor winding
temperature, etc. As shown in
Figure 3-6 , the temperature sensor and resistor R98
form a +3.3V analog supply voltage divider, setting the voltage proportional to the
temperature at the analog input of the dsPIC DSC. To reduce the noise, temperature
feedback can be further filtered by the RC filter, R93 and C57. This circuit is not
populated by default. When used, populate the connector J9 with
Part Number B2B-EH-A(LF)(SN) or similar, and components, R98, R93 and C57,
appropriately.
FIGURE 3-6: EXTERNAL TEMPERATURE INTERFACE CIRCUIT
3.2.8 User Interface
The dsPIC33CK Low-Voltage Motor Control Board user interface has three
push buttons, along with a potentiometer and LEDs. The potentiometer (POT1) can be
used for setting the speed reference, LEDs (LD11, LD12) are for status indication and
the general purpose push buttons (SW1, SW2 and SW3) can be used to start and stop
the motor. The LEDs, LD4 to LD9, indicate the presence of PWM outputs, which are
used for controlling the motor control inverter. Additionally, test pads (TP11, TP12 and
TP13) are provided on the unused pins of the dsPIC33CK256MP508, which can be
configured and used as general purpose inputs or outputs based on application
requirements.
For details, refer to
Section 2.3 “User Interface Hardware” .
AGND
DNP
R98
AGND
TEMP_EXT
DNP
R93
DNP
C57
1
2
DNP
J9
+3.3 VA
TEMP_EXT
TP21