Digilent DMC60C Довідковий посібник - Сторінка 10

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+3.3V Supply Voltage

+3.3V Supply Current

+5V Supply Voltage

+5V Supply Current

Digital Input Signal Logic High Threshold

A, B, Index, Fwd/Rev Limit)

Digital Input Signal Logic Low Threshold (Encoder A,

B, Index, Fwd/Rev Limit)

All expansion port digital input pins tolerate input voltages up to 5.5V. Each of these pins is

clamped to the 3.3V supply through a 200 ohm resistor and a Schottky diode

11 Limit Switches

The DMC60C expansion port includes pins for attaching both forward and reverse limit switches.

These input pins can be individually configured to interface with a normally open or normally closed

switch using Digilent's web-based configuration utility on the RoboRio or by sending the appropriate

CAN frame on the CAN bus. Additionally, the enable/disable state of the limit switch inputs can be

overridden by the CAN control frame.

By default, both the forward and reverse limit switch inputs are enabled and configured to interface

with normally open switches. When a limit switch is active the DMC60C will not allow the motor

output to be driven in the associated direction. Any attempt to drive the output in the direction of an

active limit switch will result in the neutral duty cycle being applied to the H-Bridge.

The onboard Microcontroller uses internal pull-ups on both pins, and as a result, no external pull-ups

are required. The diagrams that follow show how to wire switches to the forward and reverse limit

switch inputs.

3.135

4.75

(Encoder

2.64

3.3

3.465

0.050

5.0

5.25

0.100

5.5

0.66