S-5855AACA-I4T1U Datasheet, PDF (14/27 Pages) Seiko Instruments Inc – PWM OUTPUT TEMPERATURE SENSOR IC

PWM OUTPUT TEMPERATURE SENSOR IC
S-5855A Series
Rev.1.2_01
 Explanation of Terms
1. Duty ratio accuracy (Dsp5)
Dsp5 shows duty ratio in temperature TSP5 5°C higher than duty ratio change-start temperature TS.
100 %
Dsp5
Duty ratio [%]
5°C
T_S T_SP5
Ta [°C]
Figure 12
2. Duty ratio temperature sensitivity (Ddt(E))
Duty ratio temperature sensitivity (Ddt(E)) is the temperature coefficient of duty ratio calculated from the output duty
ratio at Ta = TSP5 and Ta = TEM5. TEM5 is the temperature decided for each product shown in Table 11, and Dem5 is
the output duty ratio at Ta = TEM5. Ddt(E) is calculated using the following formula.
Ddt(E) = (Dem5 − Dsp5) / (TEM5 − TSP5) [%/°C]
100%
Dsp5
Duty ratio [%]
Dem5
Ddt(E)^*1
T_S TSP5
Ta [°C]
T_EM5
*1. Selectable from −1 %/°C to −4 %/°C in 1 %/°C step
Figure 13
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