CS8190EDWF20G ON Semiconductor, CS8190EDWF20G Datasheet - Page 8

• Manufacturer Part Number: CS8190EDWF20G
• Description: IC TACH/SPEEDO DRVR PREC 20SOICW
• Manufacturer: ON Semiconductor
• Type: Driverr

Specifications of CS8190EDWF20G

• Applications: Automotive
• Mounting Type: Surface Mount
• Package / Case: 20-SOIC (7.5mm Width)
• Operating Supply Voltage: 13.1 V
• Supply Current: 125 mA
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Design Example
inaccuracies due to IC tolerances or meter movement
pointer placement.
regulator. The maximum output current from the voltage
regulator is 10 mA. R3 must ensure that the current does not
exceed this limit.
the input signal. Time for one cycle at maximum frequency
is 2.85 ms. To ensure that C
Maximum meter Deflection = 270°
Maximum Input Frequency = 350 Hz
Let C
RT should be a 250 kW potentiometer to trim out any
Resistor R3 sets the output current from the voltage
Choose R3 = 3.3 kW
The charge current for C
C
1. Select R
2. Select R3 and R4
CP
Speedo Input
Battery
GND
must charge and discharge fully during each cycle of
CP
q + 970
= 0.0033 mF, find R
600 PIV
R T +
1.0 A
D1
T
V REG * 0.7 V
Notes:
1.
2.
3.
4.
5.
6.
7. Gauge coil connections to the IC must be kept as short as possible (≤ 3.0 inch) for best pointer stability.
R3
and C
970
C2 (> 2000 mF) is needed if return to zero function is required.
The product of C4 and R
C4 Range; 20 pF to 0.2 mF.
R4 Range; 100 kW to 500 kW.
The IC must be protected from transients above 60 V and reverse battery conditions.
Additional filtering on the FREQ
500 mW
3.3 kW
FREQ
3.0 kW
R1
3.9,
R T + 243 kW
CP
10 kW
350 Hz
R2
CP
± 30 PPM/°C
CP
C CP
270°
is
0.0033 mF
D2
50 V,
500 mW
Zener
T
+ 1.90 mA
is charged, assume that the
0.1 mF
C3
Figure 9. Speedometer or Tachometer Application
C1
C
0.0033 mF
CP
R T + 270°
T
0.1 mF
2000 mF
have a direct effect on gain and therefore directly affect temperature compensation.
C2
1.0 kW
IN
R4
lead may be required.
http://onsemi.com
COSINE
CS8190
1
8
CP+
SQ
FREQ
GND
GND
COS+
COS−
V
CC
OUT
(R3 + R4) C
minimum input period.
ripple voltage and response time of the meter movement.
capacitor C2. This is selected by increasing the input signal
frequency to its maximum so the pointer is at its maximum
deflection, then removing the power from the circuit. C2
should be large enough to ensure that the pointer always
returns to the 0° position rather than 360° under all operating
conditions.
used to produce a Speedometer and Odometer circuit.
Air Core
Gauge
Choose R4 = 1.0 kW.
Discharge time: t
Charge time: t
C4 is selected to satisfy both the maximum allowable
With C4 = 0.47 mF, the F/V ripple voltage is 44 mV.
The last component to be selected is the return to zero
Figure 10 shows how the CS8190 and the CS8441 are
IN
200 W
3. Determine C4
F/V
SINE+
SINE−
V
BIAS
GND
GND
CP−
REG
OUT
CP
T + 10%
SINE
C4 +
CHG
time constant is less than 10% of the
Speedometer
DCHG
C4
= (R3 + R4)C
= 14.2 ms
C CP(VREG * 0.7 V)
+
= R3 × C
= 10.9 ms
0.47 mF
350 Hz
DV MAX
1
CP
CP
+ 285 ms
= 4.3 kW. × 0.0033 mF
R
= 3.3 kW × 0.0033 mF
T
Trim Resistor
± 20 PPM/°C