CS4101
Speedometer/Odometer or Tachometer Application
R3
Speedo
Input
R2
C3
C
T
2
3
4
5
6
7
8
R4
1
CP+
SQ
OUT
FREQ
IN
BIAS
Gnd
Gnd
NC
COS+
COS-
V
CC
CP-
20
F/V
OUT
19
V
REG
18
C4
+
R
T
CS4101
NC
17
Gnd
16
Gnd
15
NC
14
SIN+
13
SINE-
12
F
GEN
11
Battery
D1 R1
D2
C1
C2
9
10
COSINE
SINE
Air Core
Gauge
200W
Speedometer
Figure 6
R1 - 3.9, 500mW
R2 - 10k�½
R3 - 3k�½
R4 - 1k�½
R
T
- Trim Resistor +/- 20 PPM/DEG. C
C1 - 0.1µF
C2 - 1. Stand alone Speedo or Tach "0" µF
2. Stand alone Speedo or Tach with return to Zero, 2000µF
3. With CS-8441 application, 10µF
C3 - 0.1µF
C4 - 0.47µF
C
T
- 0.0033µF, +/- 30 PPM/¡C
D1 - 1A, 600 PIV
D2 - 50V, 500mW Zener
Note 1: For 58% Speed Input T
MAX
² 5/f
MAX
where
T
MAX
= C
T
(R3+R4)
f
MAX
= maximum speed input frequency
R3
Speedo
Input
R2
C3
C
T
R4
1
2
3
4
5
6
7
8
CP+
SQ
OUT
FREQ
IN
BIAS
Gnd
Gnd
NC
COS+
COS-
V
CC
CP-
20
F/V
OUT
19
V
REG
18
C4
+
R
T
CS4101
NC
17
Gnd
16
Gnd
15
NC
14
SIN+
13
SINE-
12
F
GEN
11
Battery
D1 R1
D2
C1
9
10
COSINE
SINE
Air Core
Gauge
200W
Speedometer
C2
1
CS8441
Air Core
Stepper Motor
200W
Odometer
Figure 7
Note 1: The product of C
T
and R
T
have a direct effect on
gain and therefore directly effect temperature
compensation
Note 2: C4 Range; 20pF to .2µF
Note 3: R4 Range; 100k�½ to 500k�½
Note 4: The IC must be protected from transients above
60V and reverse battery conditions
Note 5: Additional filtering on the FREQ
IN
lead may be
required
7
CHERRY [ CHERRY SEMICONDUCTOR CORPORATION ]
