SCI7660C
0B
/M
0B
Recommended circuit in low voltage operation
*D1
1MΩ
1
2
3
4
8
7
6
5
+
–
R
L
C
L
C2=22µF
–
+
C1=10µF
*D1(V
F
(I
F
=1mA)≤0.6V)
s
CIRCUIT DESCRIPTION
q
C-R Oscillator
The SCI7660C
0B
/M
0B
contains a C-R oscillator for
internal oscillation. It consists of an external resistor
R
OSC
connected between the OSC1 pin and OSC2 pin.
q
Voltage Converters
OSC2
C-R Oscillation
OSC1
Rosc
OSC2
OSC1
External Clock
Open
External Clock Operation
The voltage converters double the input supply voltage (V
I
) using clocks generated by the C-R oscillator.
A doubled voltage can be obtained with a booster capacitor between CAP+ and CAP–, and with a external
smoothing capacitor between V
I
and V
O
.
5V
1
1MΩ
2
V
1
= – 5V
3
4
7
6
C1
5
8
C2
10µF
V
CC
(+5V)
GND
(–5V)
10µF
V
0
= – 10V
(2V
1
)
V
DD
=0V
V
1
= – 5V
V
0
=2V
1
= – 10V
Typical doubled voltage relations
3
EPSON [ EPSON COMPANY ]
