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4552 Datasheet(PDF) 47 Page - Renesas Technology Corp |
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4552 Datasheet(HTML) 47 Page - Renesas Technology Corp |
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47 / 145 page  Rev.3.02 Dec 22, 2006 page 47 of 142 REJ03B0023-0302 4552 Group (5) LCD power supply circuit Select the LCD power supply circuit suitable for the using LCD panel. The LCD power supply circuit is fixed by the followings; • The internal dividing resistor is controlled by bit 0 of register L2. • The internal dividing resistor is selected by bit 3 of register L1. • The bias condition is selected by bits 0 and 1 of register L1. qInternal dividing resistor The 4552 Group has the internal dividing resistor for LCD power supply. When bit 0 of register L2 is set to “0”, the internal dividing resis- tor is valid. However, when the LCD is turned off by setting bit 2 of register L1 to “0”, the internal dividing resistor is turned off. The same six resistor (r) is prepared for the internal dividing re- sistor. According to the setting value of bit 3 of register L1 and using bias condition, the resistor is prepared as follows; • L13 = “0”, 1/3 bias used: 2r ✕ 3 = 6r • L13 = “0”, 1/2 bias used: 2r ✕ 2 = 4r • L13 = “1”, 1/3 bias used: r ✕ 3 = 3r • L13 = “1”, 1/2 bias used: r ✕ 2 = 2r qVLC3/SEG0 pin The selection of VLC3/SEG0 pin function is controlled with the bit 3 of register L2. When the VLC3 pin function is selected, apply voltage of VLC3 < VDD to the pin externally. When the SEG0 pin function is selected, VLC3 is connected to VDD internally. q VLC2/SEG1, VLC1/SEG2 pin The selection of VLC2/SEG1 pin function is controlled with the bit 2 of register L2. The selection of VLC1/SEG2 pin function is controlled with the bit 1 of register L2. When the VLC2 pin and VLC1 pin functions are selected and the internal dividing resistor is not used, apply voltage of 0<VLC1<VLC2<VLC3 to these pins. Short the VLC2 pin and VLC1 pin at 1/2 bias. When the VLC2 pin and VLC1 pin functions are selected and the internal dividing resistor is used, the dividing voltage value gen- erated internally is output from the VLC1 pin and VLC2 pin. The VLC2 pin and VLC1 pin have the same electric potential at 1/2 bias. When SEG1 and SEG2 pin functions are selected, use the inter- nal dividing resistor. In this time, VLC2 and VLC1 are connected to the generated dividingg voltage. Fig. 36 LCD power supply circuit example (1/3 bias condition selected) VLC3 VLC2 VLC1 SEG0 SEG1 SEG2 VLC3 VLC2 VLC1 VLC3 SEG1 SEG2 a) Register L2=(0000)2 b) Register L2=(1000)2 VLC3 VLC2 VLC1 VLC3 VLC2 VLC1 VLC3 VLC2 VLC1 c) Register L2=(1110)2 d) Register L2=(1111)2 VLC3 VLC2 VLC1 |
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