MC556 High Performance Microstepping Driver
MC556 High Performance Microstepping Driver
5
6
3. External terminal instructions
◆
Control Signal Connector
Pin Function
Details
PUL+
Pulse signal: In single pulse (pulse/direction) mode, this input represents
pulse signal, each rising or falling edge active; 4-5V when PUL-HIGH,
0-0.5V when PUL-LOW. For reliable response, pulse width should be
longer than 1.5
μ
s. Series connect resistors for current-limiting when +12V
or +24V used. The same as DIR and ENA signals.
PUL-
DIR+
DIR signal: In single-pulse mode, this signal has low/high voltage levels,
representing two directions of motor rotation; For reliable motion
response, DIR signal should be ahead of PUL signal by 5
μ
s at least.
4-5V when DIR-HIGH, 0-0.5V when DIR-LOW. Please note that rotation
direction is also related to motor-driver wiring match. Exchanging the
connection of two wires for a coil to the driver will reverse motion
direction.
DIR-
ENA+
Enable signal: This signal is used for enabling/disabling the driver. High
level (NPN control signal, PNP and Differential control signals are on the
contrary, namely Low level for enabling.) for enabling the
driver and low level for disabling the driver. Usually left
UNCONNECTED (ENABLED).
ENA-
◆
Main Circuit Connector
Pin Function
Details
+V
Power supply, 20~50 VDC, Including voltage fluctuation and EMF voltage.
GND
Power Ground.
A+, A-
Motor Phase A
B+, B-
Motor Phase B
4. Control Signal Connector Interface
The MC556 can accept differential and single-ended inputs (including open-collector and
PNP output). The MC556 has 3 optically isolated logic inputs which are located on
connector P1 to accept line driver control signals. These inputs are isolated to minimize or
eliminate electrical noises coupled onto the drive control signals. Recommend use line
driver control signals to increase noise immunity of the driver in interference
environments. In the following figures, connections to open-collector and PNP signals are
illustrated.
Figure 2: Connections to open-collector signal (common-anode)