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PCF8813 Datasheet(PDF) 36 Page - NXP Semiconductors |
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PCF8813 Datasheet(HTML) 36 Page - NXP Semiconductors |
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36 / 72 page  2004 Mar 05 36 Philips Semiconductors Product specification (67 + 1) × 102 pixels matrix LCD driver PCF8813 11.11 Set HV generator stages The PCF8813 incorporates a software-configurable voltage multiplier. After reset (RES) the voltage multiplier is set to 2 × VDD2. Other voltage multiplier factors are set via the set HVgen stages command bits S[1:0]. 11.12 Bias system The bias voltage levels are set in the ratio of R-R-nR-R-R giving a 1/(n + 4) bias system. Different multiplex rates require different n factors. This is programmed by BS[2:0] (see Table 15). For multiplex rates of 1 : 68 the optimum bias value n is given by: resulting in 1/9 bias. Changing the bias system from the optimum value will have a consequence for the contrast and viewing angle. One reason to depart from the optimum would be to reduce the required operating voltage. A compromise between contrast and operating voltage must be found for any particular application. Table 15 Bias system programming Table 16 LCD bias voltage Notes 1. Operation of bias level V4 is given for V4 > VSS + 0.9 V. For higher multiplex rates, VLCD has to be selected accordingly. 2. For multiplex rates equal to or lower than 1 : 24 (n = 2) operation of the bias level V5 is limited to voltages V5 < VDD2,3 − 1.1 V. VLCD has to be selected accordingly. The operating voltage can be set by software through the interface. The binary number VOP representing the operating voltage can be set according to the following formula: Where: VOP is an 8-bit unsigned number used internally for generation of the LCD supply voltage VLCD VCAL is a 5-bit twos complement number set by the module maker; see Table 17 VPR is an 8-bit unsigned number composed of PRS and VPR* set by an interface command. The corresponding voltage at the reference temperature, TCUT, can be calculated as: BS[2] BS[1] BS[0] n RECOMMENDED MULTIPLEX RATES 0007 1 : 100 0016 1 : 80 0 1 0 5 1:65or1:67 0114 1 : 48 1 0 0 3 1:34or1:40 1012 1 : 24 1 1 0 1 1:18or1:16 1 1 1 0 1:10,1:9or1:8 n68 3 – 5.246 5 == = SYMBOL BIAS VOLTAGES BIAS VOLTAGES FOR 1/9 BIAS V1 VLCD VLCD V2 8/9 × VLCD V3 7/9 × VLCD V4(1) 2/9 × VLCD V5(2) 1/9 × VLCD V6 VSS VSS n3 + () n4 + () ----------------- n2 + () n4 + () ----------------- 2 n4 + () ----------------- 1 n4 + () ----------------- V OP V CAL 4:0 [] V PR∗ + = V LCD Tcut () aV OP b × + () = |
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