CS8191 View Datasheet(PDF) - Cherry semiconductor
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CS8191 Datasheet PDF : 8 Pages
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Speedometer/Odometer or Tachometer Application
Battery
D1 R1
Ground
D2
C1
R2
C3
Typical Speedometer
Input
1 VCCPC+
2 VREG
3 BIAS
4 Gnd
5 Gnd
6 COS-
7 SINE-
8 FREQIN
F/VOUT16
CP+ 15
CP- 14
Gnd 13
Gnd 12
COS+ 11
SINE+ 10
SQOUT 9
SINE
C4+
RT
R4
R3
CT
COSINE
Air Core
Gauge
Speedometer
Figure 6
R1 - 3.9, 500mW
R2 - 10k½
R3 - 3k½
R4 - 1k½
RT - Trim Resistor +/- 20 PPM/DEG. C
C1 - 0.1µF
C2 - With CS-8441 application, 10µF
C3 - 0.1µF
C4 - 0.47µF
CT - 0.0033µF, +/- 30 PPM/¡C
D1 - 1A, 600 PIV
D2 - 50V, 500mW Zener
Note 1: The product of CT and RT have a direct effect on gain and
therefore directly effect temperature compensation.
Note 2: C4 Range; 20pF to .2µF.
Note 3: R4 Range; 100k½ to 500k½.
Battery
D1 R1
Ground
D2
C1
R2
C3
Typical Speedometer
Input
C2
1 VCCPC+
2 VREG
3 BIAS
4 Gnd
5 Gnd
6 COS-
7 SINE-
8 FREQIN
F/VOUT16
CP+ 15
CP- 14
Gnd 13
Gnd 12
COS+ 11
SINE+ 10
SQOUT 9
SINE
C4+
RT
R4
R3
CT
COSINE
1
CS8441
Air Core
Gauge
Speedometer
Figure 7
Air Core
Stepper Motor
200W
Odometer
Note 4: The IC must be protected from transients above 60V and reverse
battery conditions.
Note 5: Additional filtering on the FREQIN lead may be required.
In some cases a designer may wish to use the CS8191 only
as a driver for an air-core meter having performed the F/V
conversion elsewhere in the circuit.
Figure 8 shows how to drive the CS8191 with a DC voltage
ranging from 2V to 6V. This is accomplished by forcing a
voltage on the F/VOUT lead. The alternative scheme shown
in figure 9 uses an external op amp as a buffer and operates
over an input voltage range of 0V to 4V.
An alternative solution is to use the CS4101 which has a
separate function generator input lead and can be driven
directly from a DC source. Figure 8 and 9 are not tempera-
ture compensated.
100kW
VREG
CS8191
CP-
VIN
100kW
0V to 4V DC
100kW
CS8191
BIAS +
CP- -
+
10kW
-
F/VOUT
10kW
VIN
2V to 6V DC
N/C
BIAS
F/VOUT
100kW
100kW
Figure 8. Driving the CS8191 from an external DC voltage.
Figure 9. Driving the CS8191 from an external DC voltage using an Op
Amp Buffer.
7
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