Oki ML63611, User Manual

Page: 210 / 271

ML63611 User’s Manual
Chapter 15 Power Supply Circuit (POWER)
15 – 6
OPTION B (D): 1.5 V (3.0 V), With regulator
circuit for LCD bias
OPTION A (C): 1.5 V (3.0 V), Without regulator
circuit for LCD bias
15.3.4 Operation of the OPTION B Power Supply Circuit
The battery voltage (V
DD
) is supplied to the different voltage regulator circuits (V/R1, V/R2, and V/R3) of the
OPTION B. The output voltages of the voltage regulator circuits are used as the internal logic power supply
(V
CH
), the power supply voltage (V
XT
) for the low-speed generator circuit, and the reference voltage (V
DD1
) for the
LCD bias generator circuit. Further, the battery voltage is connected directly to the power supply of the high-
speed clock generator circuit.
The output voltage of the voltage regulator V/R1 is supplied as the power supply (V
CH
) for the internal logic
circuits during low-speed clock operation.
The output voltage of the voltage regulator circuits V/R2 and V/R3 are always supplied respectively as the power
supply voltage (V
XT
) for the low-speed clock generator circuit and the reference voltage (V
DD1
) for the LCD bias
generator circuit.