CS8191
CS8191
Precision Air-Core Tach/Speedo Driver
with Short Circuit Protection
Description
The CS8191 is specifically designed
for use with 4 quadrant air-core
meter movements. The IC includes
an input comparator for sensing
input frequency such as vehicle
speed or engine RPM, a charge
pump for frequency to voltage con-
version, a bandgap reference for
stable operation and a function
generator with sine and cosine
amplifiers that differentially drive
the motor coils.
The CS8191 has a higher torque
output and better output signal
symmetry than other competitive
parts (CS289, and LM1819). It is
protected against short circuit and
overvoltage (60V) fault conditions.
Enhanced circuitry permits func-
tional operation down to 8V.
Features
s
Direct Sensor Input
s
High Output Torque
s
Wide Output Voltage
Range
s
High Impedance Inputs
s
Accurate down to 10V V
CC
s
Fault Protection
Overvoltage
Short Circuit
s
Low Voltage Operation
Absolute Maximum Ratings
( ² 100ms pulse transient) ...........................................V
CC
= 60V
(continuous) ..................................................................V
CC
= 24V
Operating Temperature Range ........................................................-40¡C to +105¡C
Junction Temperature Range ...........................................................-40¡C to +150¡C
Storage Temperature Range.............................................................-55¡C to +165¡C
Electrostatic Discharge (Human Body Model) ...................................................4kV
Lead Temperature Soldering
Wave Solder (through hole styles only)..................10 sec. max, 260¡C peak
Reflow (SMD styles only)...................60 sec. max above 183¡C, 230¡C peak
Supply Voltage
Package Options
16 Lead PDIP
(internally fused leads)
V
CC
1
V
REG
2
BIAS
3
Gnd
4
Gnd
5
16
15
14
13
12
11
10
9
F/V
OUT
CP+
CP-
Gnd
Gnd
COS+
SINE+
SQ
OUT
Block Diagram
+
Charge Pump
Input
Comp.
Voltage
Regulator
V
REG
COS
Output
Function
Generator
+
Ð
COS-
High Voltage, Short
Circuit Protection
+
+
Ð
SINE-
Ð
Ð
V
REG
7.0V
Gnd
SINE
Output
+
Ð
+
Ð
BIAS
CP+
SQ
OUT
FREQ
IN
F/V
OUT
CP-
COS-
6
SINE-
7
FREQ
IN
8
20 Lead SOIC
(internally fused leads)
V
CC
1
V
REG
2
BIAS
3
20
19
18
17
16
15
14
13
12
11
Gnd
Gnd
COS+
Gnd
F/V
OUT
CP+
CP-
NC
Gnd
Gnd
NC
COS+
SIN+
SQ
OUT
SINE+
NC
4
Gnd
5
Gnd
6
NC
7
COS-
8
SIN-
9
FREQ
IN
10
V
CC
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
Rev 3/9/99
1
A
¨
Company
CHERRY [ CHERRY SEMICONDUCTOR CORPORATION ]
