CS3717A Datasheet, PDF (4/8 Pages) Cherry Semiconductor Corporation – 1A H-Bridge Stepper Motor Driver

Typical Performance Characteristics
Source Saturation Voltage vs. Output Current
(Recirculation Period)
Source Saturation Voltage vs. Output Current
(Conduction Period)
4
3
2
1
0
0.2
0.4
0.6
0.8
I (A)
Sink Saturation Voltage vs. Output Current
4
3
2
1
0
0.2
0.4
0.6
0.8
I (A)
Comparator Threshold vs. Junction Temperature
4
3
2
1
0
0.2
0.4
0.6
0.8
I (A)
100
80
60
40
20
0
20 40 60 80 100 120 140 160
T_J (C)
Application Information
The application diagram shows a typical application in
which two CS3717A's control a two phase bipolar stepper
motor.
Programming
Control of the motor
The stepper motor can rotate in either direction according
to the sequence of the input signals. It is possible to
obtain a full step, a half step and quarter step operation.
The amplitude of the current flowing in the motor wind-
ing is controlled by the logic inputs IN0 and IN1. The
truth table (page 3) shows three current levels and an off
state. A high level on the “Direction” logic input sets the
direction of that current from OUTA to OUTB; a low level
from OUTB to OUTA.
It is recommended that unused inputs are tied to V_CC or
(Gnd) as appropriate to avoid noise problems.
The current levels can be varied continuously by chang-
ing V_REF.
Full step operation
Both windings of the stepper motor are energized all the
time with the same current I_MA = I_MB.
IN0 and IN1 remain fixed at whatever torque value is
required.
Calling A the condition with winding A energized in one
direction and A in the other direction, the sequence for
full step rotation is:
AB→AB→AB→AB etc.
4