S1C63666 TECHNICAL MANUAL
EPSON
9
CHAPTER 2: POWER SUPPLY AND INITIAL RESET
CHAPTER
2 P
OWER
S
UPPLY
AND
I
NITIAL
R
ESET
2.1 Power Supply
The S1C63666 operating power voltage is as follows:
Table 2.1.1 Operating voltage
Operating mode
Normal mode
Halver mode
Normal mode
Maximum operating frequency
4 MHz (OSC3)
32 kHz (OSC1 only)
32 kHz (OSC1 only)
Operating voltage
2.4 V to 3.6 V
2.4 V to 3.6 V
1.5 V to 3.6 V
The S1C63666 operates by applying a single power supply within the above range between V
DD
and V
SS
.
The S1C63666 itself generates the voltage necessary for all the internal circuits by the built-in power
supply circuits shown in Table 2.1.2.
Table 2.1.2 Power supply circuits
Circuit
OSC1 circuit
Internal circuits
(low-speed operation)
OSC3 and internal circuits
(high-speed operation)
LCD driver
Power supply
Voltage regulator for
OSC1 oscillation circuit
Low-speed operation
voltage regulator
High-speed operation
voltage regulator
LCD system voltage
circuit
Output voltage
V
OSC
V
D1L
V
D3
V
C1
–V
C3
Note: • Do not drive external loads with the output voltage from the internal power supply circuits.
• See Chapter 7, "Electrical Characteristics", for voltage values and drive capability.
External
power
supply
LCD system
voltage regulator
LCD driver
CC
CD
V
DDA
V
DD
V
D2
V
C1
V
C2
V
C3
CA
CB
V
OSC
V
D1
V
SS
V
SSA
V
C1
V
C1
V
C2
V
C3
V
D1L
V
OSC
V
D3
V
D2
=1/2 V
DD
V
D1
Voltage
halver
Voltage booster
LCD system voltage circuit
LPWR
VDC3
VDC2
VDC0
VDC1
Low-speed operation
voltage regulator
Voltage regulator for
OSC1 oscillation circuit
OSC1
oscillation circuit
CPU,
internal circuits
R/f
converter
High-speed operation
voltage regulator
OSC3
oscillation circuit
+
Fig. 2.1.1 Configuration of power supply
Содержание S1C63666
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