S5855A datasheet(13/27 Pages) SII

Part #	S5855A

Description	PWM OUTPUT TEMPERATURE SENSOR IC

PDF	27 Pages

Scroll/Zoom	100%

Manufacturer	SII [Seiko Instruments Inc]

Direct Link	http://www.sii.co.jp

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PWM OUTPUT TEMPERATURE SENSOR IC

Rev.1.2_00

S-5855A Series

Seiko Instruments Inc.

Operation

Duty ratio

The following equation is the definition of duty ratio.

Duty ratio = PW / T

× 100 [%]

The definitions of PW and T are shown in Figure 11.

Figure 11

Oscillation frequency

The oscillation frequency is set by the capacitance value of the capacitor CFREQ for the oscillation frequency.

The relationship between the CFREQ capacitance value of each duty ratio temperature sensitivity and the center value

of the oscillation frequency are shown in Table 11.

Table 11

Duty ratio temperature sensitivity

Ddt(s) [%/°C]

CFREQ capacitance value

[nF]

Center value of oscillation frequency

[Hz]

−1

2.2

2300

−2

4.7

2160

−3

6.8

2240

−4

10.0

2030

S5855A Datasheet(PDF) 13 Page - Seiko Instruments Inc