CS3717A Datasheet, PDF (3/8 Pages) Cherry Semiconductor Corporation – 1A H-Bridge Stepper Motor Driver

Truth Table
IN0
IN1
Output Current
H
H
No Current
L
H
Low Current
H
L
Medium Current
L
L
High Current
PACKAGE PIN #
16L
(Internally Fused Leads)
1
2
3
4, 5, 12, 13
6
7
8
9
10
11
14
15
16
Package Pin Description
PIN SYMBOL
FUNCTION
OUT B
Pulse
V_DDB
Gnd
V_CC
IN1
DIRECTION
IN0
Comp In
V_REF
V_DDA
OUT A
Sense
Output connection with OUTA. The output stage is a ÒHÓ bridge
formed by four transistors and four diodes suitable for switching
applications.
A parallel RC network connected to this pin sets the OFF time of
the lower power transistors. The pulse generator is a monostable
triggered by the rising edge of the output of the comparators
(t_OFF = 0.69 R_TC_T).
Supply voltage input for half output stage.
Ground connection. Also conducts heat from die to printed
circuit copper.
Supply voltage input for logic circuitry.
This pin and IN0 are logic inputs which select the outputs of the
three comparators to set the current level. Current also depends on
the sensing resistor and reference voltage. See truth table.
This TTL-compatible logic input sets the direction of current
flow through the load. A high level causes current to flow from
OUTA (source) to OUTB (sink). A Schmitt trigger on this input
provides good noise immunity and a delay circuit prevents out-
put stage short circuits during switching.
See IN1.
Input connected to the three comparators. The voltage across the
sense resistor is fed back to this input through the low pass filter
R_CC_C. The lower power transistors are disabled when the sense
voltage exceeds the reference voltage of the selected comparator.
When this occurs the current decays for a time set by R_TC_T,
t_OFF = 0.69 R_TC_T.
A voltage applied to this pin sets the reference voltage of the
three comparators, thus determining the output current (also
dependent on R_Sense and the two inputs IN 0 and IN 1).
Supply voltage input for half output stage.
See OUTB.
Connection to lower emitters of output stage for insertion of
current sense resistor.
3