CS289GDWF20 datasheet(5/6 Pages) CHERRY

Teilenummer	CS289GDWF20

Bauteilbeschribung	20mA Air-Core Tachometer Drive Circuit

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Hersteller	CHERRY [Cherry Semiconductor Corporation]

Direct Link	http://www.cherrycorp.com/

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5

IIN

0.7V

2.1V

IOUT/EQ

CP

RT

CT

1k

W

10k

W

TRIM

CP

VF/V

OUT = 2.1 + Frequency x CT x RT (VREG -0 .7)

The above equations were used in calculating the follow-

ing values, where VF/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

Tachometer Application

RPM

60

x # OF CYL.

2

= Frequency

Typical values shown above apply to a nominal value of

VREG of 8.5 volts. It must be realized that trimming of RT

will be necessary to compensate for variations in regula-

tor voltage from one unit to another.

An alternative to this adjustment is to replace R2 with a

potentiometer, as shown in Figure 2.

Partial schematic shown in Figure 3 represents one met-

hod for use with DC applications instead of frequency.

Figure 2: Alternate Trimming Method

Figure 3: DC Application

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