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2 Power Supply, Reset, and Clocks
The power supply, reset, and clocks in this IC are managed by the embedded power generator, system reset control-
ler, and clock generator, respectively.
2.1 Power Generator (PWG2)
2.1.1 Overview
PWG2 is the power generator that controls the internal power supply system to drive this IC with stability and low
power. The main features of PWG2 are outlined below.
• High-efficiency DC-DC converter for driving internal circuits
• Supports four operating modes including automatic transition to power-saving operations (normal mode, econo-
my mode, automatic mode, and super economy mode).
Figure 2.1.1.1 shows the PWG2 configuration.
V
DD
C
C
V1
PW1
C
CV
C
V2
C
PW3
V
D2
C
PW2
V
D1
V
SS
2.1.2 Pins
Table 2.1.2.1 lists the PWG2 pins.
Pin name
V
DD
V
SS
V
D1
V
D2
C
, C
V1
V2
For the V
operating voltage and recommended external parts, refer to "Recommended Operating Conditions,
DD
Power supply voltage V
DD
gram" chapter, respectively.
Note: Be sure to avoid using the V
S1C17W18 TECHNICAL MANUAL
(Rev. 1.2)
PWG2
DCCCLK[1:0]
Divider
V
SS
DC-DC converter
V
DD
V
SS
V
DD
V
SS
Figure 2.1.1.1 PWG2 Configuration
Table 2.1.2.1 List of PWG2 Pins
I/O
Initial status
P
–
P
–
A
–
A
–
A
–
" in the "Electrical Characteristics" chapter and the "Basic External Connection Dia-
and V
pin outputs for driving external circuits.
D1
D2
Seiko Epson Corporation
2 POWER SUPPLY, RESET, AND CLOCKS
OSC1CLK
MODCMPIE
Interrupt
control circuit
MODCMPIF
PWGMOD[2:0]
Function
Power supply (+)
GND
DC-DC converter output pin
DC-DC converter stabilization capacitor connect pin
(Not available in the 64-pin/80-pin package)
DC-DC converter charge pump capacitor connect pins
(Not available in the 64-pin/80-pin package)
Internal circuits
Clock
generator
Interrupt
controller
V
D1
2-1
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