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PCF8578U/2 数据表(PDF) 13 Page - NXP Semiconductors |
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PCF8578U/2 数据表(HTML) 13 Page - NXP Semiconductors |
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13 / 44 page ![]() 1998 Sep 08 13 Philips Semiconductors Product specification LCD row/column driver for dot matrix graphic displays PCF8578 Fig.8 LCD drive mode waveforms for 1 : 16 multiplex rate. MSA836 VDD V2 V V V V 3 4 5 LCD T frame ROW 1 R1 (t) VDD V2 V V V V 3 4 5 LCD ROW 2 R2 (t) VDD V2 V V V V 3 4 5 LCD COL 1 C1 (t) VDD V2 V V V V 3 4 5 LCD COL 2 C2 (t) dot matrix 1:16 multiplex rate state 1 (OFF) state 2 (ON) 0.2 Vop 0.2 Vop 0 V Vop Vop V state 1 (t) 0.2 Vop 0.2 Vop 0 V Vop Vop V state 2 (t) 0.6 Vop 0.6 Vop Vstate 1 (t) = C1(t) R1(t): Von(rms) Vop = 1 16 16 1 16 1 () 16 = 0.316 Vstate 2 (t) = C2(t) R2(t): Voff(rms) Vop = 16 1 16 1 () 16 = 0.254 2 2 () general relationship (n = multiplex rate) Von(rms) Vop = 1 n n 1 n 1 () n Voff(rms) Vop = n 1 n 1 () n 2 2 () |
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