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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST7568 датащи(PDF) 43 Page - Sitronix Technology Co., Ltd. |
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ST7568 датащи(HTML) 43 Page - Sitronix Technology Co., Ltd. |
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43 / 73 page  ST7568 Ver 2.2 43/73 2008/01/04 GD3=WD3, LD3, DD3, BD3 GA2=WD2, LD2, DD2, BD2 GA1=WD1, LD1, DD1, BD1 GA0=WD0, LD0, DD0, BD0 LCD bias voltage Symbol Bias voltage for 1/8 bias Symbol Bias voltage for 1/8 bias VLCDIN VLCDIN V3 2/8 X VLCDIN V1 7/8 X VLCDIN V4 1/8 X VLCDIN V2 6/8 X VLCDIN VSS VSS Set VOP value: The operation voltage VLCD can be set by software. V0=( a + VOP×b ) (1) The parameters are explained in table 4.The maximum voltage that can be generated is depending on the VDD voltage and the display load current. Two overlapping VLCD ranges are selectable via the command “Booster control”. For the LOW (PS=0) range a=a1 and for the HIGH (PRS=1) range a=a2 with steps equal to “b” in both ranges. Note that the charge pump is turned off if VOP [6;0] and the bit PRS are all set to zero. The V0 Temperature Gradient is -0.05%/ oC Table 4 Typical values for parameter for the HV-Generator programming SYMBOL VALUE UNIT a1 2.94(PRS=0) V a2 6.75(PRS=1) V b 0.03 V 00 01 02 03 04 05 06 ..... 7E 7F 00 7D 01 02 03 04 05 06 ..... 7E 7D 7F a1+b b a2 VL2 LOW(PRS=0) HIGH(PRS=1) VOP [6:0](programmed) {00 hex … 7F hex} Fig.21 VOP programming of ST7568 |
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