
CHAPTER 2: POWER SUPPLY AND INITIAL RESET
S1C60N09 TECHNICAL MANUAL
EPSON
5
CHAPTER
2POWER SUPPLY AND INITIAL RESET
2.1 Power Supply
With a single external power supply (
) supplied to VDD through VSS, the S1C60N09 Series generates the
necessary internal voltages (<VS1> for oscillator and internal circuits and <VL1–VL3> for driving LCD)
with the internal power supply circuit.
Supply voltage: S1C60N09 ... 3.0 V S1C60L09 ... 1.5 V
The internal power supply circuit is configured according to the LCD drive voltage specification selected
by mask option. Figure 2.1.1 shows the configuration of the power supply circuit.
VDD
VS1
VL1
VL2
VL3
CA
CB
VSS
3.0 V
C4
C2
C3
C1
0.1
F
0.1
F
0.1
F
0.1
F
VDD
VS1
VL1=1/2VL2
VL2=VSS
VL3=3/2VL2
VSS
4.5 V LCD Panel
1/4, 1/3 or 1/2 duty, 1/3 bias
S1C60N09
VL2 and VSS are shorted internally.
Note:
Voltage
regulator
LCD
voltage
circuit
VDD
VS1
VL1
VL2
VL3
CA
CB
VSS
3.0 V
C3
C2
C1
0.1
F
0.1
F
VDD
VS1
VL1=1/2VL3
VL2=1/2VL3
VL3=VSS
VSS
3 V LCD Panel
1/4, 1/3 or 1/2 duty, 1/2 bias
VL3 and VSS are shorted internally.
Note:
Voltage
regulator
LCD
voltage
circuit
VDD
VS1
VL1
VL2
VL3
CA
CB
VSS
1.5 V
C4
C2
C3
C1
0.1
F
0.1
F
0.1
F
0.1
F
VDD
VS1
VL1=VSS
VL2=2VL1
VL3=3VL1
VSS
4.5 V LCD Panel
1/4, 1/3 or 1/2 duty, 1/3 bias
S1C60L09
VL1 and VSS are shorted internally.
Note:
Voltage
regulator
LCD
voltage
circuit
VDD
VS1
VL1
VL2
VL3
CA
CB
VSS
1.5 V
C3
C2
C1
0.1
F
0.1
F
0.1
F
VDD
VS1
VL1=VSS
VL2=VSS
VL3=2VL1
VSS
3 V LCD Panel
1/4, 1/3 or 1/2 duty, 1/2 bias
VL1 and VSS are shorted internally.
Note:
Voltage
regulator
LCD
voltage
circuit
0.1
F
Fig. 2.1.1 Power supply configuration and external elements
Notes: External loads cannot be driven by the output voltage of the internal power supply circuit.
See Chapter 6, "ELECTRICAL CHARACTERISTICS", for voltage values.