Datasheet CS289GN14, CS289GDWFR20, CS289GDWF20 Datasheet (Cherry Semiconductor)

Features

■

Single Supply Operation

■

On-Chip Regulation

■

20mA Output Drive
Capability

Package Options

20L SOIC Wide

(internally fused leads)

14L PDIP

CS289

20mA Air-Core Tachometer Drive Circuit

1

V

Z

V

SINE

V

BIAS

Gnd

C

P

Ð

CP+

NC

V

CC

V

COS

V

REG

SQIN

S

Q

OUT

F/V

OUT

Gnd

Gnd

Gnd

Gnd

Gnd

Gnd

Gnd

1

V

Z

V

SINE

V

BIAS

Gnd

C

P

Ð

C

P

+

NC

Pwr Gnd

V

CC

V

COS

V

REG

SQIN

S

Q

OUT

F/V

OUT

CS289

Description

The CS289 is specifically designed
for use with air-core meter move­ments. The IC has charge pump cir­cuitry for frequency-to-voltage con­version, a shunt regulator for stable

operation, a function generator, and
sine and cosine amplifiers. The
buffered sine and cosine outputs
will typically sink or source 20mA.

Block Diagram

Absolute Maximum Ratings

Supply Voltage (VCC)......................................................................................20V

Operating Temperature ............................................................Ð40¡C to +100¡C

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

Storage Temperature.................................................................Ð65¡C to +150¡C

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

1

Rev. 3/8/99

Cherry Semiconductor Corporation

2000 South County Trail, East Greenwich, RI 02818

Tel: [phone] Fax: [phone]

Email: [e-mail]

Web Site: www.cherry-semi.com

A Company

¨

Pwr Gnd

V

CC

V

COS

V

SQIN F/V OUT

REG

SQOUT

Regulator

Charge

Pump

Function

Generator

V

Z

SINE

V

BIAS

CpÐ GndV

+Ð

CP+

2

Package Pin Description

PACKAGE PIN # PIN SYMBOL FUNCTION

Electrical Characteristics: (VCC= 13.1V, -30¡C ² TA² 85¡C)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

CS289

20L SO

(internally fused leads) 14L PDIP

11V

Z

External Zener reference.

22V

sine

Sine output signal.

34V

BIAS

Test pin or "0" calibration pin.

4, 5, 6, 7, 7 Gnd Analog Ground connection.

14, 15, 16, 17

85C

PÐ

Negative input to charge pump.

96C

P+

Positive input to charge pump.

10 3 NC No Connection

11 8 F/V

OUT

Output voltage proportional to input signal frequency.

Supply Current (Note 2) V

CC

= 15.0V 54 mA

V

CC

= 13.1V 60 65 mA

V

CC

= 11.3V 60 65 mA

Regulated Voltage I

REG

= 4.3mA 7.7 8.5 9.3 V

Regulation I

REG

= 0 to 5mA 0.10 0.20 V

Signal Input Current T = 25¡C 0.1 2.0 4.0 mA
Saturation Voltage I

SQ

OUT = 5mA, ISQIN = 500µA 0.20 0.55 V

Leakage Current I

SQ

OUT = 16V, VSQIN = 0V 10 µA

Input Current C

P

+ = 0, T = 25¡C 1 15 nA

F to V Output V

SQ

IN = 0 (zero input), Æ = 0¡ 1.8 2.1 2.4

V

COS

= 0 (Note 1), Æ = 270¡ 6.3 7.1 7.9 V

Linearity E

O

vs. Frequency

V

COS

= 0 (Note 1), Æ = 270¡, T = 25¡C -1.5 1.5 %

V

sine

at Æ = 0¡ VSQIN = 0 (zero input), Æ = 0¡ -0.55 0.00 0.55 V

MAX V

sine+

V

COS

= 0 (Note 1), Æ=90¡ 3.8 4.5 5.8 V

MAX V

sine-

V

COS

= 0 (Note 1), Æ = 270¡ -3.8 -4.5 -5.8 V

Coil Drive Current V

COS

= 0 (Note 1), Æ = 90¡, T = 25¡C 20 25 mA

V

COS

= 0 (Note 1), Æ = 270¡ 20 25 mA

MAX V

COS+

VSQIN = 0 (zero input), Æ = 0¡ 3.8 4.5 5.8 V

MAX V

COS-

V

sine

= 0 (Note 1), Æ = 180¡ -3.8 -4.5 -5.8 V

Coil Drive Current V

SQ

IN = 0 (zero input), Æ = 0¡ 20 25 mA

V

sine

= 0 (Note 1), Æ = 180¡ 20 25 mA

External Voltage Ref. 4.98 5.40 5.85 V

Note 1: V

sine

measured V

sine

to VZ. V

COS

measured V

COS

to VZ. All other voltages specified are measured to ground.

Note 2: Max PWR dissipation ²V

CC

X ICC- (V2I

sine

+ V12 I

COS

).

3

CS289

Typical Performance Characteristics

Output Angle in Polar Form

Charge Pump Output Voltage

V

SINE

, V

COS

(V)

-4.5

-3.5

-2.5

-1.5

V

Z

1.5

2.5

3.5

4.5

4.5V

4.5V

0 45û 90û 135û 180û 225û 270û

V

COS

V

SINE

2.1 3.8 5.45 7.1

Tachometer Angular Deflection (°)

Function Generator Output Voltage

Package Pin Description: continued

PACKAGE PIN # PIN SYMBOL FUNCTION

Note 1: V

sine

measured V

sine

to VZ. V

COS

measured V

COS

to VZ. All other voltages specified are measured to ground.

Note 2: Max PWR dissipation ²V

CC

X ICC- (V2I

sine

+ V12 I

COS

).

20L SO 14L PDIP

12 9 SQOUT Buffered square wave output signal.

13 10 SQIN Speed or RPM input signal.

18 11 V

REG

Voltage regulator output.

19 12 V

COS

Cosine output signal.

20 13 V

CC

Supply voltage.

14 Pwr Gnd Power Ground connection.

COSINE

OUTPUT

Ð

V

Z

+

VP COS Q

SINE OUTPUT

Ð

Q

V

SIN Q

P

+

Relationship of EQ, Q and Frequency

7.1

6

5

4

F/V Output (V)

3

2.1

F/V

OUT

0 45û 90û 135û 180û 225û 270û

Frequency/Output Angle (°)

= 2.0V + FREQ X CT X RT X V

REG

4

CS289

Function Generator Output (Æ): VCC=13.1V, TA=25¡C

Æ=ArcTan (Measured angle after calibration at 180¡C)

For ÆA=45¡, 90¡, 135¡, 180¡, 225¡, 270¡, (Desired angle)

(ÆA-ÆM)²4.0¡

Temperature Sensitivity: VCC=13.1V

ÆÆMT=ÆM(T=25¡C) -ÆM (-20¡C²T²+85¡C)

(ÆÆMT)²3.5¡C, -20¡C²T²+85¡C

Voltage Sensitivity: TA=25¡C

ÆÆMV=ÆM(VCC=13.1V) -ÆM(11.3V²VCC²15V)

(ÆÆMV)²2¡, 11.3V²VCC²15V

V

sine

V

cos

B+

100W

ZENER

5.4V

SINE
80mH

225

80mH
225

B+

15

18V

Gnd

R2
2kW

2kW

1kW

E

Q

TACH INPUT

R

T

180kW
*

C

OUT

1mF

±10%

R1

1kW

C

T

0.01mF

S

Q

OUT

F-V

OUT

NC

C

P

Ð

VZV

SINE

V

BIAS

Gnd

* ADJUST FOR TRIMMING

V

CC

V

COSVREG

S

Q

IN

C

P

+

CS289

Figure 1. Functional Diagram of CS289 Circuit.

The input frequency is buffered through a transistor, then
applied to the charge pump for frequency-to-voltage con­version (Figure 1). The charge pump output voltage, EÆ,
will range from 2.1V with no input (Æ= 0¡) to 7.1V at Æ =
270¡. The charge that appears on CTis reflected to C

OUT

through a Norton amplifier. The frequency applied at
SQIN charges and discharges CTthrough R1and R2. C

OUT

reflects the charge as a voltage across resistor RT.

Circuit Description

Charge Pump

Function Generator/Sine and Cosine Amplifiers

The output waveforms of the sine and cosine amplifiers
are derived by On-Chip Amplifier/Comparator circuitry.
The various trip points for the circuit (i.e. 90¡, 180¡, 270¡)
are determined by an internal resistor divider connected
to the voltage regulator. The voltage EÆ is compared to
the divider network by the function generator circuitry.
Use of an external zener reference at VZallows both sine
and cosine amplifiers to swing positive and negative with
respect to this reference. The output magnitudes and
directions have the relationship as shown in Typical
Characteristics diagrams.

Note: Pin connections referenced are for the 14L DIP.

5

V

F/V

OUT

= 2.1 + Frequency x CTx RT(V

REG

-0 .7)

The above equations were used in calculating the follow­ing values, where V

F/V

OUT

= 7.1V at =270¡ and CT= 0.01 F.

4 cylinder: Freq = 200Hz, RT= 320k½
6 cylinder: Freq = 300Hz, RT= 220k½
8 cylinder: Freq = 400Hz, RT= 150k½

CS289

Tachometer Application

RPM

60

x

# OF CYL.

2

= Frequency

Typical values shown above apply to a nominal value of
V

REG

of 8.5 volts. It must be realized that trimming of R

T

will be necessary to compensate for variations in regula­tor voltage from one unit to another.

An alternative to this adjustment is to replace R2with a
potentiometer, as shown in Figure 2.

Partial schematic shown in Figure 3 represents one met­hod for use with DC applications instead of frequency.

Figure 2: Alternate Trimming Method

Figure 3: DC Application

10kW

IN

COS

NC V

REG

V

BIAS

V

Q

S

Ð

P

C

OUT

Q

S

+

P

C

OUT

F-V

Gnd

R

T

TRIM

C

P

I

OUT/EQ

OUT

R

Ð

+

P

P

C

C

T

Gnd F-V

0.7V

2.1V

C

P

1kW

C

T

I

IN

6

Part Number Description

CS289GDWF20 20 Lead SO Wide (internally fused leads)
CS289GDWFR20 20 Lead SO Wide (internally fused leads)

(tape & reel)

CS289GN14 14 Lead PDIP

CS289

Thermal Data 14L 20L SOIC

PDIP Wide (internally fused leads)

R

QJC

typ 48 17 ¡C/W

R

QJA

typ 85 90 ¡C/W

D

Lead Count Metric English

Max Min Max Min
14L PDIP 19.69 18.67 .775 .735
20L SO Wide 13.00 12.60 .512 .496

(internally fused leads)

Package Specification

PACKAGE DIMENSIONS IN mm (INCHES)

Ordering Information

PACKAGE THERMAL DATA

Rev. 3/8/99

© 1999 Cherry Semiconductor Corporation

Cherry Semiconductor Corporation reserves the
right to make changes to the specifications without
notice. Please contact Cherry Semiconductor
Corporation for the latest available information.

Surface Mount Wide Body (DW); 300 mil wide

1.27 (.050) BSC

7.60 (.299)

7.40 (.291)

10.65 (.419)

10.00 (.394)

D

0.32 (.013)

0.23 (.009)

1.27 (.050)

0.40 (.016)

REF: JEDEC MS-013

2.49 (.098)

2.24 (.088)

0.51 (.020)

0.33 (.013)

2.65 (.104)

2.35 (.093)

0.30 (.012)

0.10 (.004)

Plastic DIP (N); 300 mil wide

0.39 (.015)
MIN.

2.54 (.100) BSC

1.77 (.070)

1.14 (.045)

D

Some 8 and 16 lead
packages may have
1/2 lead at the end
of the package.
All specs are the same.

.203 (.008)

.356 (.014)

REF: JEDEC MS-001

3.68 (.145)

2.92 (.115)

8.26 (.325)

7.62 (.300)

7.11 (.280)

6.10 (.240)

.356 (.014)

.558 (.022)