S1F78100Y2A Epson Electronics America, Inc., S1F78100Y2A Datasheet - Page 54

• Manufacturer Part Number: S1F78100Y2A
• Description: High Precision Voltage Regulators
• Manufacturer: Epson Electronics America, Inc.

FUNCTIONAL DESCRIPTIONS
CR Oscillator
The on-chip CR oscillator network frequency is deter-
mined by the external resistor, R
tween OSC1 and OSC2. This oscillator can be disabled
in favor of an external clock by leaving OSC2 open and
applying an external clock signal to OSC1.
Reference Volatge Generator and Voltage
Regulator
The reference voltage generator supplies a reference
voltage to the voltage regulator to control the output.
This voltage can be switched ON and OFF.
S1F70000 Series
Technical Manual
OSC1
OSC2
Oscillator
V
P
V
REG
OFF
RV
DD
R
OSC
OSC1
OSC2
External clock
R
RV
= 100 k to 1 M
OSC
External clock
Control signal
, connected be-
signal
EPSON
Voltage Multiplier
The voltage multiplier uses the clock signal from the
oscillator to double or triple the input voltage. This re-
quires three external capacitors–two charge-pump ca-
pacitors between CAP1+ and CAP1– and CAP2+ and
CAP2–, respectively, and a smoothing capacitor be-
tween V
Double voltage potential levels
Tripled voltage potential levels
V
V
DD
I
= –5 V
V
(+5V)
GND
(–5V)
= 0 V
V
CC
5 V
O
V
V
= 3V
DD
I
10 F
10 F
= –5 V
I
C1
C2
and V
= 0 V
I
= –15 V
+
+
1
2
3
4
5
6
7
O
V
.
V
V
CAP2
DD
I
= –5 V
+
= 0 V
– = 2V
10 F
C3
I
= –10 V
14
13
12
11
10
9
8
S1F76610 Series
R
1 M
V
OSC
O
= –15 V
R1
R2
100 k
1 M
R
V
to
RV
REG
2–11
+
= –8 V
10 F
C4