Cherry Semiconductor CS8442XN8 Datasheet
1
Features
■ Buffered Speed Sensor
Output
■ No Cross-conduction in
either H-bridge
■ Guaranteed Monotonic
■
On Chip Flyback Diodes
■ Fault Protection
Overvoltage
Short Circuit Protection
Load Dump Protection
to 60V
Package Options
8L PDIP
CS8442
85mA Dual H-Bridge Odometer Driver
with Buffered Speed Signal Output
Description
Block Diagram
Absolute Maximum Ratings
The CS8442 is a stepper motor
driver that implements an Hbridge design to drive two coils in
an eight step sequence each revolution. Each H-bridge is capable of
delivering 85mA to the load.
The sequencer function insures
that the odometer is monotonic
and that cross-conduction of each
H bridges does not occur. Before
the beginning of each sequence,
both bridges are turned off. This
Òdead zoneÓ minimizes the fly
back energy generated in the
inductive loads. In addition, on
board clamp diodes across each
output protect the output drive
transistors from excessive fly back
voltages.
The CS8442 is fault protected
against reverse battery, short circuit, and over voltage conditions.
If a fault is detected, the IC shuts
down.
The buffered speed signal output
(SENSOR OUT) is an open collector NPN capable of driving a
4.7k½ load connected to a 5V supply. The signal is a buffered,
inverted version of the speed sensor input voltage (SENSOR IN).
The input voltage can be either a
sine or square wave form.
CS8442
Supply Voltage (VCC) (continuous) -40ûC to +105ûC ..................Ð0.5 to 24V
(100ms pulse transient) -40ûC to +105ûC ......................Ð0.5 to 60V
Input Voltage (VIN) ..............................................................Ð0.3 to VCC+0.3V
Storage Temperature Range (T
STG
)......................................Ð65¡C to +150¡C
Junction Temperature.............................................................Ð40¡C to +150¡C
Speed Sensor Output .....................................................................................7V
ESD (Human Body Model) .........................................................................2kV
Lead Temperature Soldering
Wave Solder (through hole styles only)........10 sec. max, 260¡C peak
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Email: info@cherry-semi.com
Web Site: www.cherry-semi.com
A Company
¨
Rev. 8/2/93
SENSOR
IN
Input
Comp.
Coil
Driver
A
COILA+
COILA-
1
Gnd
COILA+
COILAÐ
SENSOR
IN
V
CC
COILB+
COILBÐ
SENSOR
OUT
SENSOR
OUT
Sequencer
Overvoltage
and Short
Circuit
Protection
Coil
Driver
B
COILB
+
COILB-
2
CS8442
Electrical Characteristics: Unless otherwise stated, these specifications apply for -40ûC to +105ûC, V
CC
= 6.5 to 15.5 VDC. All
voltage shall be referenced to Gnd unless otherwise noted. Overvoltage shutdown of coils occurs when V
CC
>16V.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
* Voltage across the coils shall be measured at the specific voltages, but shall also be within linearly interpolated limits.
■ Supply
Supply Voltage Range TA= -40¡C to +105¡C 6.5 15.5 a
TA= -40¡C to +25¡C 6.5 24.0 a
Supply Current VCC= 15.5 VDC 35 mA
Outputs not loaded
Overvoltage Shutdown 16 23 V
■ Speed Sensor
Input Frequency Range 0 400 Hz
Switching Threshold 1.6 3.0 VDC
Hysteresis 300 mV
Input Bias Current VIN= 0.8VDC to V
CC
±1 µA
Input Voltage Range 0 8 VDC
Operating Input Voltage 10K Ohm Resistor in Series -15 VDC
to V
CC
Output Saturation Voltage ICC=1.3mA 0.4 V
Output Leakage VCC=5.5V 10 µA
Input Clamp Current I Clamp at VIN= 0 VDC -0.4 -5.0 mA
■ Coil Output Drivers
Coil Load +25¡C 198 210 222 ½
Coil Inductance 80 mH
Coil Resistance Temperature Coefficient 0.39 %/¡C
* Energized Coil Voltage
(Both Polarities) A and B VCC= 6.5 VDC VCC-1.50 VDC
VCC= 10.0 VDC VCC-1.60 VDC
VCC= 15.5 VDC,TA= -20¡C to +105¡C VCC-1.75 VDC
VCC= 15.5 VDC,TA= -40¡C to -20¡C VCC-2.00 VDC
De-Energized Coil Leakage ±100 µA
Current
■ Short Circuit Protection
Short Circuit Threshold 275 400 mA
Coil A + Coil B
Short Circuit Turn Off Delay 5 µs
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