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SCI7661C Datasheet(PDF) 5 Page - Epson Company |
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SCI7661C Datasheet(HTML) 5 Page - Epson Company |
5 / 9 page 5 SCI7661COA/MOA s CIRCUIT DESCRIPTION q C-R Oscillator The SCI7661C/M contains a C-R oscillator for internal oscillation. It consists of an external resistor ROSC connected between the OSC1 pin and OSC2 pin. q Voltage Converters The voltage converters doubleÅ^triple the input supply voltage (VIN) using clocks generated by the C-R oscillator qReference Voltage Generator and Voltage Regulator The reference voltage generator produces reference voltage needed for operation of regulator circuit. The voltage regulator is used to regulate a boosted output voltage and its circuit contains a power-off function which uses signals from the system for on-off control of the Vreg output. q Temperature Gradient Selector Circut The SCI7661C/M provides the Vreg output with a temperature gradient suitable for LCD driving. 0.30 0.25 50 0 -50 0.20 0.15 0.10 0.05 0.00 V OUT= -5V V OUT= -10V CT: -0.1%/ °C CT: -0.4%/ °C CT: -0.6%/ °C V OUT= -15V I OUT(mA) Ta( °C) 0 -50 0 50 100 510 15 20 Fig:13 Regulated Output Saturation Resistance(RSAT)Vreg—VOUT —IOUT Fig:14 Output Voltage(vreg)vs. Temperature(Ta) Osc1 Osc2 Osc1 Osc2 ROSC C-R Oscillation External Clock Operation Open External Clock VCC VDD=0V VDD=0V VIN=-5V VIN=-5V CAP2=2VIN=-10V VOUT=3VIN=-15V (+5V) (-5V) GND Typical Doubled Voltage Relations Typical Tripled Voltage Relations VDD Poff Vreg RV Voltage Regulator Control signal RRV = 100kΩ to 1MΩ |
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