ST7586S datasheet(25/63 Pages) SITRONIX

25 / 63 page

ST7586S

Ver-1.1a

25/63

2009/11/30

Temperature Gradient Selection Circuit

SET V0 with temperature compensation (Temperature

≠ 24°C)

There are 16-line slopes in each temperature step, and customer can select one line slope of temperature compensation

coefficient for each temperature step. Each temperature step is 8°C. Please see Fig. 11 as below.

Fig. 11

Temperature Compensation Coefficient Selection

In instruction Temperature Gradient Compensation each parameter MTx, where x=0, 1, 2,…, E, F has a setting value

between 0 and 15. MTx=0 results in Mx=0V increment on V0, MTx=1 results in Mx=5mV increment,…, MTx=15 results in

Mx=15x5mV=75mV increment. Note that each MTx individually corresponds to a temperature interval; the Mx means

temperature gradient slope coefficient. The relations between Mx and V0 quantity due to temperature V0(T) are described in

the equation shown in Table 3.

Temerature Range

Equation V0(T) at temperature=T°C

-40°C ≦ T < -32°C

V0(T) = V0(T24) + (-32 - T) x M0 + (M1 + M2 + M3 + M4 + M5 + M6 + M7) x 8

-32°C ≦ T < -24°C

V0(T) = V0(T24) + (-24 - T) x M1 + (M2 + M3 + M4 + M5 + M6 + M7) x 8

-24°C ≦ T < -16°C

V0(T) = V0(T24) + (-16 - T) x M2 + (M3 + M4 + M5 + M6 + M7) x 8

-16°C ≦ T < -8°C

V0(T) = V0(T24) + (-8 - T) x M3 + (M4 + M5 + M6 + M7) x 8

-8°C ≦ T < 0°C

V0(T) = V0(T24) + (0 - T) x M4 + (M5 + M6 + M7) x 8

0°C ≦ T < 8°C

V0(T) = V0(T24) + (8 - T) x M5 + (M6 + M7) x 8

8°C ≦ T < 16°C

V0(T) = V0(T24) + (16 - T) x M6 + M7 x 8

16°C ≦ T < 24°C

V0(T) = V0(T24) + (24 - T) x M7

24°C ≦ T < 32°C

V0(T) = V0(T24) - (T - 24) x M8

32°C ≦ T < 40°C

V0(T) = V0(T24) - (T - 32) x M9 – M8 x 8

40°C ≦ T < 48°C

V0(T) = V0(T24) - (T - 40) x M10 – (M9 + M8) x 8

48°C ≦ T < 56°C

V0(T) = V0(T24) - (T - 48) x M11 – (M10 + M9 + M 8) x 8

56°C ≦ T < 64°C

V0(T) = V0(T24) - (T - 56) x M12 – (M11 + M10 + M9 + M8) x 8

64°C ≦ T < 72°C

V0(T) = V0(T24) - (T - 64) x M13 – (M12 + M11 + M10 + M9 + M8) x 8

72°C ≦ T < 80°C

V0(T) = V0(T24) - (T - 72) x M14 – (M13 + M12 + M11 + M10 + M9 + M8) x 8

80°C ≦ T < 88°C

V0(T) = V0(T24) - (T - 80) x M15 – (M14 + M13 + M12 + M11 + M10 + M9 + M8) x 8

Table 3

ST7586S Datasheet(PDF) 25 Page - Sitronix Technology Co., Ltd.

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