Cherry Semiconductor CS8190EDWFR20 Datasheet

1

Features

■

Direct Sensor Input

■

High Output Torque

■

Low Pointer Flutter

■

High Input Impedance

■ Overvoltage Protection

■ Return to Zero

Package Options

16 Lead PDIP

(internally fused leads)

20 Lead SOIC

(internally fused leads)

CS8190

Precision Air-Core Tach/Speedo Driver

with Return to Zero

1

CP+

2

3

4

5

6

7

8

SQ

OUT

FREQ

IN

Gnd

Gnd

COS+

16

15

14

13

12

11

10

CP-

F/V

OUT

V

REG

Gnd

Gnd

SIN+

9

COS- SIN-

17

18

V

CC

BIAS

19

20

Gnd

Gnd

Gnd

Gnd

CS8190

Description

The CS8190 is specifically designed
for use with air-core meter move­ments. The IC provides all the func­tions necessary for an analog
tachometer or speedometer. The
CS8190 takes a speed sensor input
and generates sine and cosine relat­ed output signals to differentially
drive an air-core meter.

Many enhancements have been
added over industry standard

tachometer drivers such as the
CS289 or LM1819. The output uti­lizes differential drivers which elim­inates the need for a zener reference
and offers more torque. The device
withstands 60V transients which
decreases the protection circuitry
required. The device is also more
precise than existing devices allow­ing for fewer trims and for use in a
speedometer.

Block Diagram

Absolute Maximum Ratings

Supply Voltage (<100ms pulse transient) .........................................VCC= 60V

(continuous)..............................................................VCC= 24V

Operating Temperature .............................................................Ð40¡C to +105¡C

Storage Temperature..................................................................Ð40¡C to +165¡C

Junction Temperature .................................................................Ð40¡C to+150¡C

ESD (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

A Company

¨

Rev. 11/21/96

Cherry Semiconductor Corporation

2000 South County Trail, East Greenwich, RI 02818

Tel: [phone] Fax: [phone]

Email: [e-mail]

Web Site: www.cherry-semi.com

BIAS

SQ

FREQ

CP+

OUT

IN

Gnd

Gnd

Charge Pump

Input

Comp.

+

Ð

Voltage

Regulator

V

REG

7.0V

+

Ð

F/V

CP-

V

Gnd

Gnd

OUT

REG

1

CP+

2

SQ

OUT

Gnd

Gnd

COS+

COS-

V

3

IN

4

5

6

7

8

CC

FREQ

16

15

14

13

12

11

10

9

CP-

F/V

V

REG

Gnd

Gnd

SINE+

SINE-

BIAS

OUT

COS

COS

+

Output

-

V

CC

COS

Ð

+

+

Ð

Func.

Gen.

High Voltage

Protection

Ð

+

SINE

Output

+

Ð

SINE+

SINE-

2

Electrical Characteristics:

-40¡C ² TA² 85¡C, 8.5V ² VCC² 15V unless otherwise specified.

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

CS8190

■ Supply Voltage Section

I

CC

Supply Current VCC= 16V, -40¡C, No Load 50 125 mA

VCCNormal Operation Range

8.5 13.1 16.0 V

■ Input Comparator Section

Positive Input Threshold 1.0 2.0 3.0 V
Input Hysteresis 200 500 mV
Input Bias Current * 0V ² V

IN

² 8V -10 -80 µA
Input Frequency Range 0 20 KHz
Input Voltage Range in series with 1k½ -1 V

CC

V

Output V

SAT

ICC= 10mA 0.15 0.40 V

Output Leakage V

CC

= 7V 10 µA

Low V

CC

Disable Threshold 7.0 8.0 8.5 V

Logic 0 Input Voltage 1 V

* Note: Input is clamped by an internal 12V Zener.

■ Voltage Regulator Section

Output Voltage 6.25 7.00 7.50 V
Output Load Current 10 mA
Output Load Regulation 0 to 10 mA 10 50 mV
Output Line Regulation 8.5V ² V

CC

² 16V 20 150 mV

Power Supply Rejection V

CC

= 13.1V, 1Vp/p 1kHz 34 46 dB

■ Charge Pump Section

Inverting Input Voltage 1.5 2.0 2.5 V
Input Bias Current 40 150 nA
V

BIAS

Input Voltage 1.5 2.0 2.5 V

Non Invert. Input Voltage I

IN

= 1mA 0.7 1.1 V
Linearity* @ 0, 87.5, 175, 262.5, + 350Hz -0.10 0.28 +0.70 %
F/V

OUT

Gain @ 350Hz, CT= 0.0033µF, RT= 243k½ 7 10 13 mV/Hz

Norton Gain, Positive I

IN

= 15µA 0.9 1.0 1.1 I/I
Norton Gain, Negative I

IN

= 15µA 0.9 1.0 1.1 I/I

* Note: Applies to % of full scale (270¡)

■ Function Generator Section: -40¡ ² T

A

² 85¡C, VCC= 13.1V unless otherwise noted.

Return to Zero Threshold T

A

= 25¡C 5.2 6.0 7.0 V

Differential Drive Voltage 8.5V ² V

CC

² 16V 5.5 6.5 7.5 V

(V

COS

+ - V

COS

-) Q = 0¡

Differential Drive Voltage 8.5V ² V

CC

² 16V 5.5 6.5 7.5 V

(V

SIN

+ - V

SIN

-) Q = 90¡

Differential Drive Voltage 8.5V ² V

CC

² 16V -7.5 -6.5 -5.5 V

(V

COS

+ - V

COS

-) Q = 180¡

Differential Drive Voltage 8.5V ² V

CC

² 16V -7.5 -6.5 -5.5 V

(V

SIN

+ - V

SIN

-) Q = 270¡

Differential Drive Current 8.5V ² V

CC

² 16V 33 42 mA

Zero Hertz Output Angle -1.5 0.0 1.5 deg

3

PACKAGE LEAD # LEAD SYMBOL FUNCTION

CS8190

Electrical Characteristics:

continued

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

Package Lead Description

Typical Performance Characteristics

0 45 90 135 180 225 270 315

Output Voltage (V)

Degrees of Deflection (°)

7

6

5

4

3
2

1

0

-1

-2

-3

-4

-5

-6

-7

COS

SIN

045

90

135 180 225 270 315

F/V Output (V)

Frequency/Output Angle (°)

7

6

5

4

3

2

1

0

Figure 2: Charge Pump Output Voltage vs Output Angle

Figure 1: Function Generator Output Voltage

vs Degrees of Deflection

F/V

OUT

= 2.0V + 2 FREQ ´ CT´ RT´ (V

REG

- 0.7V)

■ Function Generator Section: continued

Function Generator Error * V

CC

= 13.1V -2 0 +2 deg

Reference Figures 1 - 4 Q = 0¡ to 305¡

Function Generator Error 13.1V ² V

CC

² 16V -2.5 0 +2.5 deg

Function Generator Error 13.1V ² V

CC

² 11V -1 0 +1 deg

Function Generator Error 13.1V ² V

CC

² 9V -3 0 +3 deg

Function Generator Error 25¡C ² T

A

² 80¡C -3 0 +3 deg

Function Generator Error 25¡C ² T

A

² 105¡C -5.5 0 +5.5 deg

Function Generator Error Ð40¡C ² T

A

² 25¡C -3 0 +3 deg

Function Generator Gain T

A

= 25¡C, Q vs F/V

OUT

60 77 95 ¡/V

* Note: Deviation from nominal per Table 1 after calibration at 0 and 270¡.

16L 20L

1 1 CP+ Positive input to charge pump.
22SQ

OUT

Buffered square wave output signal.

3 3 FREQ

IN

Speed or rpm input signal.

4, 5, 12, 13 4 - 7, 14 - 17 Gnd Ground Connections.

6 8 COS+ Positive cosine output signal.
7 9 COS- Negative cosine output signal.
810VCCIgnition or battery supply voltage.

9 11 BIAS Test point or zero adjustment.
10 12 SIN- Negative sine output signal.
11 13 SIN+ Positive sine output signal.
14 18 V

REG

Voltage regulator output.

15 19 F/V

OUT

Output voltage proportional to input signal frequency.

16 20 CP- Negative input to charge pump.