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SCI7654 Datasheet(PDF) 5 Page - Epson Company |
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SCI7654 Datasheet(HTML) 5 Page - Epson Company |
5 / 10 page 5 SCI7654M0A/C0A FUNCTIONAL DESCRIPTION Clock Generator Circuit As the SCI7654 has a built-in clock generator circuit, it requires no external source at all. The clock rate changes depending on the FC pin signal level, and the Low Output or High Output mode can be selected. This allows a frequency selection according to the current capacitance and load current when the booster output impedance changes depending on the clock rate and external booster capacitance. Voltage Converter Circuit The voltage converter receives a clock from the clock generator, and boosts the VIN input power voltage quadruple, triple or double. Four converter circuits are required for quadruple boosting, three converts are required for triple boosting, and dual converters are required for double boosting. Voltage step-up diagram (during -5V input) Reference Voltage Circuit The SCI7654 has a built-in reference voltage circuit for the voltage regulator. The temperature coefficient of reference voltage can be changed using pins TC1 and TC2, and a voltage having one of four types of temperature gradients can be output at VREG pin for LCD driving. VDD (0V) VIN (-5V) -10V -15V -20V 10V 15V 20V double boosting triple boosting quadruple boosting TC1 TC2 Reference Voltage, VREF (V) Temperature Coefficient, CT (%/˚C) Mode Min. Typ. Max. Min. Typ. Max. CT0 H(VDD) H(VDD) -1.55 -1.5 -1.45 -0.07 -0.04 0 CT1 H L(VIN) -1.70 -1.5 -1.30 -0.25 -0.15 -0.07 CT2 L(VIN) H -1.90 -1.5 -1.10 -0.45 -0.35 -0.20 CT3 L L -2.15 -1.5 -0.85 -0.75 -0.55 -0.30 FC pin Mode Clock Rate Current Consumption Output Ripple H (VDD) Low Output 4.0 kHz (Typ.) IOP VRP L (VIN) High Output 16.0 kHz (Typ.) Approx. 4 times of IOP Approx. 1/4 time of VRI |
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