2 POWER SUPPLY, RESET, AND CLOCKS
S1C17M12/M13 TECHNICAL MANUAL
Seiko Epson Corporation
2-1
(Rev. 1.2)
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 (PWG)
2.1.1 Overview
PWG is the power generator that controls the internal power supply system to drive this IC with stability and low
power. The main features of PWG are outlined below.
• Embedded V
D1
regulator
- The V
D1
regulator generates the V
D1
voltage to drive internal circuits, this makes it possible to keep current
consumption constant independent of the V
DD
voltage level.
- The V
D1
regulator supports two operation modes, normal mode and economy mode, and setting the V
D1
regulator into economy mode at light loads helps achieve low-power operations.
Figure 2.1.1.1 shows the PWG configuration.
V
DD
V
D1
V
SS
V
SS2
C
PW1
C
PW3
+
V
DD2
C
PW2
+
PWG
Internal circuits
I/O ports
(P50–54)
V
D1
regulator
V
D1
VD1ECO
I/O ports
(except for P40–47, P50–54)
I/O ports
(P40–47)
Figure 2.1.1.1 PWG Configuration
2.1.2 Pins
Table 2.1.2.1 lists the PWG pins.
Table 2.1.2.1 List of PWG Pins
Pin name
I/O
Initial status
Function
V
DD
P
–
Power supply (+), I/O power supply (except for P50–54)
V
DD2
P
–
I/O power supply (P50–54)
V
SS
P
–
GND (except for P40–47, P50–54)
V
SS2
P
–
GND (P40–47, P50–54)
V
D1
A
–
Embedded regulator output pin
For the V
DD
and V
DD2
operating voltage ranges and recommended external parts, refer to “Recommended Operat-
ing Conditions, Power supply voltage V
DD
, V
DD2
” in the “Electrical Characteristics” chapter and the “Basic Exter-
nal Connection Diagram” chapter, respectively.