S1C63454 TECHNICAL MANUAL
EPSON
7
CHAPTER 2: POWER SUPPLY AND INITIAL RESET
CHAPTER
2 P
OWER
S
UPPLY
AND
I
NITIAL
R
ESET
2.1 Power Supply
The S1C63454 operating power voltage is as follows:
Table 2.1.1 Operating power voltage
OSC1 oscillation circuit
Crystal oscillation
Crystal oscillation
CR oscillation
OSC3 oscillation circuit
Not use
Use
–
Operating power voltage
1.8 V–6.4 V
2.2 V–6.4 V
2.2 V–6.4 V
The S1C63454 operates by applying a single power supply within the above range between V
DD
and V
SS
.
The S1C63454 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
Oscillation and internal circuits
LCD driver
Power supply circuit
Oscillation system voltage regulator
LCD system voltage circuit
Output voltage
V
D1
V
C1
–V
C5
Note: • Do not drive external loads with the output voltage from the internal power supply circuits.
• V
C3
should be used only when the LCD drive voltage is supplied externally (1/5 bias); when
using the internal LCD system voltage circuit (1/4 bias), short between V
C3
and V
C2
terminals.
• See Chapter 7, "Electrical Characteristics", for voltage values and drive capability.
External
power
supply
Internal
circuits
Oscillation
circuit
LCD system
voltage circuit
Oscillation system
voltage regulator
V
DD
V
V
C5
V
OSC1–4
COM0–16
SEG0–39
D1
D1
V
V
V
V
V
CA
CB
CC
CD
CE
CF
C1
C2
C3
C4
C5
LCD driver
V
SS
+
V –
C1
Fig. 2.1.1 Configuration of power supply