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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).
• A few internal circuits are driven with V
Figure 2.1.1.1 shows the PWG2 configuration.
C
PW1
C
CV
C
PW3
C
PW2
C
PW4
Note: The 32-pin package model cannot be placed into super economy mode, as it does not have the
V
, C
, and C
D2
V1
V2
2.1.2 Pins
Table 2.1.2.1 lists the PWG2 pins.
Pin name
V
DD
V
DDA
V
SS
V
D1
V
D2
C
, C
V1
V2
For the V
and V
operating voltages and recommended external parts, refer to "Recommended Operating
DD
DDA
Conditions, Power supply voltage V
chapter and the "Basic External Connection Diagram" chapter, respectively.
Notes: • Be sure to avoid using the V
• The V
pin must be connected to a power supply (to V
DDA
S1C17W03/W04 TECHNICAL MANUAL
(Rev. 1.2)
, this makes it possible to operate them with a voltage different from V
DDA
PWG2
DCCCLK[1:0]
Divider
V
DD
C
*
V1
V
C
*
SS
V2
DC-DC converter
V
DD
V
V
*
SS
D2
V
DD
V
SS
V
D1
V
SS
V
DDA
Figure 2.1.1.1 PWG2 Configuration
pins.
Table 2.1.2.1 List of PWG2 Pins
I/O
Initial status
P
–
P
–
P
–
A
–
A
–
A
–
and Analog power supply voltage V
DD
and V
D1
D2
Seiko Epson Corporation
2 POWER SUPPLY, RESET, AND CLOCKS
OSC1CLK
MODCMPIE
Interrupt
control circuit
MODCMPIF
PWGMOD[2:0]
∗ The V
, C
, and C
pins do not exist in the 32-pin package.
D2
V1
V2
Power supply (+)
Analog power supply (+)
GND
DC-DC converter output pin
DC-DC converter stabilization capacitor connect pin
DC-DC converter charge pump capacitor connect pins
DDA
pin outputs for driving external circuits.
if not used).
DD
Internal circuits
Clock
generator
Interrupt
controller
V
D1
ADC12A/
P30–P35 and P44–P45
ports
Function
" in the "Electrical Characteristics"
.
DD
2-1
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