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STE2002DIE2 데이터시트(PDF) 11 Page - STMicroelectronics |
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STE2002DIE2 데이터시트(HTML) 11 Page - STMicroelectronics |
11 / 61 page STE2002 Circuit description 11/61 2.6 Temperature coefficient As the viscosity, and therefore the contrast, of the LCD are subject to change with temperature, there's the need to vary the LCD Voltage with temperature. The STE2002 provides the possibility to change the VLCD in a linear fashion against temperature with eight different Temperature Coefficient selectable through the T2, T1 and T0 bits. Only four of them are available with basic instruction set (TC1 & TC0 Bits). Figure 4. LCD voltage Finally, the VLCD voltage at a given (T) temperature can be calculated as: VLCD(T) = VLCDo · [1 + (T-To) · TC] Table 5. Temperature coefficients Name TC1 TC0 Value Unit TC0 0 0 -0.0· 10-3 1/ °C TC2 0 1 -0.7 · 10-3 1/°C TC3 1 0 -1.05· 10-3 1/°C TC6 1 1 -2.1 · 10-3 1/°C Table 6. Temperature coefficients Name TC2 TC1 TC0 Value Unit TC0 0 0 0 -0.0· 10-3 1/ °C TC1 0 0 1 -0.35 · 10-3 1/°C TC2 0 1 0 -0.7 · 10-3 1/°C TC3 0 1 1 -1.05· 10-3 1/°C TC4 1 0 0 -1.4 · 10-3 1/°C TC5 1 0 1 -1.75· 10-3 1/°C TC6 1 1 0 -2.1 · 10-3 1/°C TC7 1 1 1 -2.3· 10-3 1/°C 00h 01h 02h 03h 04h 05h …. 7Fh 00h 01h 02h 7Ch 7Dh 7Eh 03h 04h 7Dh 7Eh 7Fh 05h …. 7Ch A1 A0 B A0 + B PRS = [0;0] PRS = [0;1] VO VLCD 00h 01h 02h 03h 04h 7Dh 7Eh 7Fh 05h 7Ch PRS = [1;0] …. A2 |
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