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dsPICDEM? MC1 Motor Control Development Board
1.2.9
CAN bus
One of the CAN modules is connected to J9 via a Microchip MCP2551 CAN
Transceiver IC. A 120R terminating resistor may be connected across the bus lines by
installing LK8. A pull-down resistor ensures the TX stays inactive during RESET or if
the CAN module is not being used.
The second CAN module is available on the digital prototyping header on RG0 and
RG1. As these pins are used for the RS-485 RX and TX control, the RS-485 and the
second CAN module may not be used at the same time.
1.2.10
LCD Display
A 16x2 LCD display (U7) is included on the board. Communication to the display is via
the standard 4-bit interface method based on the well known Hitachi style communication
standard.
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The LCD data lines are on RD0-RD3.
The Enable line is on RD13.
The Read/Write is on RC1.
The Data/Command Select (LCDRS) is on RC3.
1.2.11
LEDs
Four general purpose LEDs (D6-D9) are provided on the board. These are connected
to RA9, RA10, RA14 and RA15, respectively.
A single LED (D2) is provided to indicate the +5V supply is on.
A single LED (D5) is provided to indicate direction of rotation. This is connected to RD7.
When using a quadrature encoder via J5, RD7 may be automatically driven by the QEI
module to indicate direction. Otherwise, this line must be driven as a port pin.
1.2.12
Push Button Switches
Four general purpose push button switches are provided (S4-S7). These are
connected to RG6-RG9, respectively.
A RESET switch is also provided (S1) and connected to the MCLR line of the dsPIC
device.
A TRIP switch (S3) is provided which is wire ORed with an active low FAULT signal
from J1. The resulting signal (FAULT) is connected to the FLTA input of the PWM mod-
ule and the OCFB input of the Output Compare module. When correctly configured in
software, the TRIP switch will therefore, cause all the PWM channels to be driven to
their inactive state and OC channels 5-8 to be tri-stated. Thus, the power stage may be
shut down independent of software intervention. To configure the OC channels to use
this feature, the OCM bits of OCxCON (x = 5-8) should all be set. To configure the PWM
module to use this feature, the appropriate bits in the FLTACON register should be set.
1.2.13
Potentiometers
Two potentiometers (VR1 and VR2) are provided on the board.
VR2 is permanently connected to the AN7 input of the ADC.
VR1 is only brought to the analog prototyping header J6 as POT1 owing to analog
channel constraints. If the user is not using the VPH_#1 analog feedback signal from
J1, then VR2 may be easily connected to AN12 by placing a 0.1" jumper across J6.
Alternatively, VR2 may be connected to any other spare analog channel by soldering a
wire link between the appropriate pins of J6.
DS70098A-page 8
? 2003 Microchip Technology Inc.
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