CS8441 Cherry Semiconductor Corporation, CS8441 Datasheet - Page 3

• Manufacturer Part Number: CS8441
• Description: 85mA Dual H-Bridge Odometer Driver with Divide by Select
• Manufacturer: Cherry Semiconductor Corporation

SENSOR is a PNP comparator input which accepts a sine wave
input or a square wave input. This input is protected from excur-
sions above V
rent is limited to 1.5mA. It has an active clamp set to zero volts to
prevent negative input voltages from disrupting normal opera-
tion. The sensor input can withstand 150V
current is limited to 1.5mA max using a series resistor of 100k½.
Simultaneously energizing the source and sink on either leg is
not permitted. i.e. Q1 & Q2 or Q3 & Q4 cannot be energized
simultaneously.
Circuit function is not affected by inductive transients due to coil
loads as specified in Transition States section.
The transition states occur as indicated in Table 1 without any
intermediate states permitted.
Table 1: Transition States
The polarity definition for the coil driver outputs is as follows:
Polarity
Positive (+)
Negative (-)
The speed sensor input frequency is divided by one or divided
by two by connecting the divider select input, (Pin 5) as follows:
State
0
1
2
3
4
5
6
7
PACKAGE PIN #
CC
8L PDIP
1
2
3
4
5
6
7
8
as well as any below ground, as long as the cur-
Logic 0 = divide by 2
Logic 1 = divide by 1
Divider Select Input
Coil Driver Outputs
Speed Sensor Input
Output State Table
Connect
Coil +
Gnd
V
CC
Coil A
OFF
OFF
+
+
+
-
-
-
DC
PIN SYMBOL
Gnd
COILA+
COILA-
SENSOR
SELECT
COILB-
COILB+
V
as long as the input
CC
Connect
Coil B
Coil -
OFF
OFF
Gnd
V
Package Pin Description
+
+
+
-
-
-
CC
Circuit Operation
Ground connection.
Output stage, when active, this pin supplies current to COIL A.
Output stage, when active, this pin supplies current to COIL A.
Input signal from wheel speed or engine rpm.
Selects divide by 1 or divide by 2 mode.
Output stage, when active, this pin supplies current to COIL B.
Output stage, when active, this pin supplies current to COIL B.
Supply Voltage.
3
Figure 3: Divide by 2 SELECT Mode
Figure 1: Coil Driver Output
Figure 2: Divide by 1 SELECT Mode
DIVIDE BY TWO MODE SELECT = Gnd
DIVIDE BY ONE MODE SELECT = V
Q1
Q2
FUNCTION
Q3
Q4
Circuit
Resistor
Short
Sense
Resistor
Sense
CC
Circuit
Short
Coil
Gnd
V
CC
Overvoltage
Protection
Circuit
Short
and