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STE2002 Datenblatt(PDF) 10 Page - STMicroelectronics |
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STE2002 Datenblatt(HTML) 10 Page - STMicroelectronics |
10 / 61 page Circuit description STE2002 10/61 2.5 LCD voltage generation The LCD Voltage at reference temperature (To = 27°C) can be set using the VOP register content according to the following formula: VLCD(T=To) = VLCDo = (Ai+VOP · B) (i=0,1,2) with the following values: Note that the three PRS values produce three adjacent ranges for VLCD. If the VOP register and PRS bits are set to zero the internal voltage generator is switched off. The proper value for the VLCD is a function of the Liquid Crystal Threshold Voltage (Vth) and of the Multiplexing Rate. A general expression for this is: For MUX Rate m = 65 the ideal VLCD is: VLCD(to) = 6.85 · Vth then: Table 4. LCD voltage values Symbol Value Unit Note Ao 2.95 V PRS = [0;0] A1 6.83 V PRS = [0;1] A2 10.71 V PRS = [1;0] B0.0303V To 27 °C V LCD 1m + 21 1 m --------- – ⎝⎠ ⎛⎞ ⋅ --------------------------------------- V th ⋅ = V op 6.85 V th A i – ⋅ () 0.03 -------------------------------------------- = |
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