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CS8442XN8 PDF даташит

Спецификация CS8442XN8 изготовлена ​​​​«Cherry Semiconductor Corporation» и имеет функцию, называемую «85mA Dual H-Bridge Odometer Driver with Buffered Speed Signal Output».

Детали детали

Номер произв CS8442XN8
Описание 85mA Dual H-Bridge Odometer Driver with Buffered Speed Signal Output
Производители Cherry Semiconductor Corporation
логотип Cherry Semiconductor Corporation логотип 

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CS8442XN8 Даташит, Описание, Даташиты
CS8442
85mA Dual H-Bridge Odometer Driver
with Buffered Speed Signal Output
Description
Features
The CS8442 is a stepper motor
driver that implements an H-
bridge design to drive two coils in
an eight step sequence each revo-
lution. 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 cir-
cuit, and over voltage conditions.
If a fault is detected, the IC shuts
down.
The buffered speed signal output
(SENSOR OUT) is an open collec-
tor NPN capable of driving a
4.7k½ load connected to a 5V sup-
ply. The signal is a buffered,
inverted version of the speed sen-
sor input voltage (SENSOR IN).
The input voltage can be either a
sine or square wave form.
Absolute Maximum Ratings
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 (TSTG)......................................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
Block Diagram
SENSOR
IN
Input
Comp.
Coil
Driver
A
COILA+
COILA-
s Buffered Speed Sensor
Output
s No Cross-conduction in
either H-bridge
s Guaranteed Monotonic
s On Chip Flyback Diodes
s Fault Protection
Overvoltage
Short Circuit Protection
Load Dump Protection
to 60V
Package Options
8L PDIP
Gnd 1
COILA+
COILAÐ
SENSOR
IN
VCC
COILB+
COILBÐ
SENSOR
OUT
SENSOR
OUT
Rev. 8/2/93
Sequencer
Overvoltage
and Short
Circuit
Protection
Coil
Driver
B
COILB+
COILB-
1
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Web Site: www.cherry-semi.com
A ¨ Company









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CS8442XN8 Даташит, Описание, Даташиты
Electrical Characteristics: Unless otherwise stated, these specifications apply for -40ûC to +105ûC, VCC = 6.5 to 15.5 VDC. All
voltage shall be referenced to Gnd unless otherwise noted. Overvoltage shutdown of coils occurs when VCC >16V.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
s Supply
Supply Voltage Range
Supply Current
Overvoltage Shutdown
TA = -40¡C to +105¡C
TA = -40¡C to +25¡C
VCC = 15.5 VDC
Outputs not loaded
6.5
6.5
16
15.5 a
24.0 a
35 mA
23 V
s Speed Sensor
Input Frequency Range
Switching Threshold
Hysteresis
Input Bias Current
Input Voltage Range
Operating Input Voltage
VIN = 0.8VDC to VCC
10K Ohm Resistor in Series
0
1.6
300
0
Output Saturation Voltage
Output Leakage
Input Clamp Current
ICC=1.3mA
VCC=5.5V
I Clamp at VIN = 0 VDC
s Coil Output Drivers
Coil Load
Coil Inductance
Coil Resistance Temperature
* Energized Coil Voltage
(Both Polarities) A and B
De-Energized Coil Leakage
Current
+25¡C
198
Coefficient
VCC = 6.5 VDC
VCC -1.50
VCC = 10.0 VDC
VCC -1.60
VCC = 15.5 VDC,TA= -20¡C to +105¡C VCC-1.75
VCC = 15.5 VDC,TA= -40¡C to -20¡C VCC-2.00
-0.4
210
400
3.0
±1
8
-15
to VCC
0.4
10
-5.0
Hz
VDC
mV
µA
VDC
VDC
V
µA
mA
222
80
0.39
±100
½
mH
%/¡C
VDC
VDC
VDC
VDC
µA
s Short Circuit Protection
Short Circuit Threshold
Coil A + Coil B
Short Circuit Turn Off Delay
275 400 mA
5 µs
* Voltage across the coils shall be measured at the specific voltages, but shall also be within linearly interpolated limits.
2









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CS8442XN8 Даташит, Описание, Даташиты
PACKAGE PIN #
8L PDIP
1
2
3
4
5
6
7
8
Package Pin Description
PIN SYMBOL
FUNCTION
Gnd
COILA+
COILA-
SENSOR IN
SENSOR OUT
COILB-
COILB+
VCC
Ground connection.
Output stage, when active, supplies current to COIL A.
Output stage, when active, supplies current to COIL A.
Input signal from wheel speed or engine rpm.
Buffered and inverted output of SENSOR IN signal.
Output stage, when active, supplies current to COIL B.
Output stage, when active, supplies current to COIL B.
Supply Voltage.
Application Information
Speed Sensor
SENSOR IN is a PNP comparator input that accepts a sine or
square wave input. Signals in excess of VCC or Ground will not
damage the input as long as the input current is limited to
1.5mA. An active clamp at 0V prevents negative input voltages
from disrupting normal operation. The input can withstand 150
VDC as long as the input current does not exceed 1.5mA. This is
possible if a 100k½ resistor is placed in series with the SENSOR
IN.
SENSOR OUT is an open collector NPN transistor that produces
a buffered and inverted version of the SENSOR IN signal. It is
capable of driving a 4.7k½ load connected to a 5V supply.
Sequencer
The eight step sequencer moves the two H bridge output drivers
through 8 sequential states (Table 1, Figure 1). In State 0, current
flows from COILA+ out through COIL A and back in through
COILA-. The same polarity also holds for COIL B. In State 1,
COIL A outputs turn off while COIL B outputs continue con-
ducting with the same polarity. In State 2, current flows from
COIL A- out through the coil and back in COIL A+. COIL B out-
puts continue with their original polarity. COIL A outputs
maintain this polarity through States 3 and 4 during which
COIL B outputs are first turned off and then reversed. COIL BÕs
reversed polarity continues in Stages 5 and 6. COIL AÕs outputs
are turned off in Stage 5 and then turned back on (positive
polarity) in Stage 6. In Stage 7, COIL B is off and COILA outputs
continue with a positive polarity.
Table 1: Transition States
State
0
1
2
3
4
5
6
7
Output State Table
Coil A
+
OFF
-
-
-
OFF
+
+
Coil B
+
+
+
OFF
-
-
-
OFF
The polarity definition for the coil driver outputs is as
Polarity
Positive (+)
Negative (-)
Connect
Coil +
VCC
Gnd
Connect
Coil -
Gnd
VCC
follows:
H Bridge Outputs A and B
Each H-bridge output stage consists of 4 power NPN transistors
with fly back diodes (Figure 2). Each half bridge has a composite
saturation voltage of 1.5V at VCC=15.5V and IOUT = 85mA.
The output stage is designed to prevent cross conduction: i.e., at
no time can Q1 and Q2 or Q3 and Q4 conduct. This dead zone
time minimizes fly back energy and helps protect the output
stages from damage.
Protection Circuitry
The CS8442 is protected from short circuit, over voltage and
thermal runaway conditions. When any of these faults is detect-
ed, an internal flip-flop is set and both H bridges are disabled.
When the fault condition is removed, the Flip-Flop is reset after
the first positive going edge from the speed sensor input.
STATE #
0
1
2
3
4
5
6
7
0
+
COIL A
Ð
+
COIL B
Ð
Short
Circuit
VCC
Sense
Q1 Q3 Resistor
Overvoltage
and
Coil
Short
Circuit
Protection
Q2 Q4 Short
Circuit
Gnd
Sense
Resistor
Figure 1: State Diagram for Coil Outputs
Figure 2: Coil Driver Output
3










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Номер в каталогеОписаниеПроизводители
CS8442XN885mA Dual H-Bridge Odometer Driver with Buffered Speed Signal OutputCherry Semiconductor Corporation
Cherry Semiconductor Corporation

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