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100
90
80
70
Ta = 25°C
60
V
= –2.0V
I
50
40
30
20
10
0
0
1
2
3
4
I
O
Multiplication efficiency/input current vs.
Output current
FUNCTIONAL DESCRIPTION
RC Oscillator
The on-chip RC 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
SCI7000 Series
Technical Manual
40
36
Peff
32
28
24
20
I
I
16
12
8
4
0
5
6
7
8
9 10
[mA]
, connected be-
OSC
External clock
External clock
signal
EPSON
Voltage Multiplier
The voltage multiplier uses the clock signal from the
oscillator to double the input voltage. This requires two
external capacitors—a charge-pump capacitor, C1, be-
tween CAP1+ and CAP1–, and a smoothing capacitor,
C2, between V
and V
.
I
O
V
= 0 V
DD
5 V
V
= –5 V
I
1
2
1MΩ
3
4
Doubled potential levels
V
CC
V
= 0 V
DD
(+5V)
GND
V
= –5 V
I
(–5V)
V
= (2V
O
SCI7660 Series
8
+
C2
10µF
7
V
= –10V (2V
)
O1
I
6
C1
+
10µF
5
) = –10 V
I
1–7
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