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HD66789 Datasheet(PDF) 11 Page - Renesas Technology Corp |
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HD66789 Datasheet(HTML) 11 Page - Renesas Technology Corp |
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11 / 156 page  HD66789 Preliminary Rev.0.12, May 09 2003, page 11 of 156 Signals Number of Pins I/O Connected to Functions VcomR 1 I Variable resistor or open Reference voltage for VcomH. When adjusting VcomH externally, VcomH internal adjusting circuit must be halted by register setting and place a variable resistor between VREG1OUT and GND to make an adjustment. Otherwise, leave open and adjust VcomH by internal register setting. VcomH 1 O Stabilizing capacitor High level of Vcom during Vcom AC drive. Connect to a stabilizing capacitor. VcomL 1 O Stabilizing capacitor or open Vcom voltage when Vcom AC drive is not selected. Low level of Vcom during Vcom AC drive. Voltage can be adjusted with internal registers. Connect to a stabilizing capacitor. When VCOMG bit is set to LOW, a stabilizing capacitor is not necessary because VcomL output is halted. C11+, C11- 2 - Step-up capacitor Step-up capacitor connection pins for step-up circuit 1. When the internal step-up circuit is not used, leave open. C12+, C12- C21+, C21- C22+, C22- 6 - Step-up capacitor Step-up capacitor connection pins for step-up circuit 2. Capacitor connection will be necessary depending on the step- up scale. When the internal step-up circuit is not used, leave open. OSC1, OSC2 2 I or O Resistor for the oscillator Connect an external resistor for R-C oscillation. When supplying clock signals externally, it must be supplied through OSC1 and leave OSC2 open. FLM 1 O MPU or open Frame head pulse with amplitude between GND and Vcc. Use when writing data to RAM in synchronization with FLM. When FLM is not used, leave open. Vci 1 I Power supply Power supply for analogue circuits. In this case, a power supply for the VciOUT amplifier. Connect an external power supply of 2.5~3.3V. VciLVL 1 I Power supply Generates a reference voltage (VciOUT, REGP) in accordance to the ratio set with VC2~0 registers. Connect to the same power supply as the Vci, which has separate wiring from the VciLVL on the FPC. REGP 1 I/O Test pin Test pin for VREG1OUT. Leave open. VciOUT 1 I Stabilizing capacitor, Vci1 Internal reference voltage with amplitude between Vci and GND. Set with VC bit. Vci1 1 I VciOUT Reference voltage for the step-up circuit 1. Connect to an external power supply of 2.75V or less when the internal reference voltage is not used. VLOUT1 1 O Stabilizing capacitor, DDVDH Output twice stepped-up Vci1 voltage from the step-up circuit 1. Connect to a stabilizing capacitor. VLOUT1 = 4.0~5.5V DDVDH 1 I VLOUT1 Power supply for source driver liquid crystal output portion. A reference voltage for the step-up circuit 2. |
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