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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.
Oscillator
OSC1
OSC1
R
OSC
OSC2
OSC2
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.
V
DD
P
OFF
RV
V
REG
S1F70000 Series
Technical Manual
, connected be-
OSC
External clock
External clock
signal
Control signal
R
= 100 kΩ to 1 MΩ
RV
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
and V
.
I
O
V
= 0 V
DD
1
C1
+
10 µF
2
3
5 V
C2
+
10 µF
4
5
6
7
V
= –5 V
I
+
C3
10 µF
Double voltage potential levels
V
CC
(+5V)
V
= 0 V
DD
GND
V
= –5 V
I
(–5V)
V
– = 2V
CAP2
Tripled voltage potential levels
V
= 0 V
DD
V
= –5 V
I
V
= 3V
= –15 V
O
I
S1F76610 Series
14
R
RV
R1
13
100 kΩ
R
OSC
to
1 MΩ
12
R2
1 MΩ
11
+
C4
10 µF
10
9
V
= –8 V
REG
V
= –15 V
8
O
= –10 V
I
2–11
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