SCI7661C
OA
/M
OA
q
Temperature Gradient Assignment
V
reg
Output
Temp. Gradient
CR oscillation
TC1
TC2
P
off
ON
-0.4%/°C
ON
1(V
DD
)
L(V
OUT
)
L(V
OUT
)
ON
-0.1%/°C
ON
1
L
H(V
DD
)
ON
-0.6%/°C
ON
1
H(V
DD
)
L
ON
-0.6%/°C
OFF
1
H
H
OFF(Hi-Z)
-
OFF
0(V
IN
)
L
L
OFF(Hi-Z)
-
OFF
H
L
0
OFF(Hi-Z)
-
OFF
L
H
0
OFF(Hi-Z)
-
ON
H
H
0
NOTE: The potential at Low level is different between the P
off
pin and the TC1/TC2 pin.
Remarks
Cascade connection
Without regulation
s
BASIC EXTERNAL CONNECTION
q
Voltage Doubler and Tripler
A doubled voltage can be obtained at V
OUT
(CAP2-)
by disconnecting capacitor C
2
from the tripler
configuration and shorting CAP2- (pin4) and V
OUT
-
(pin 8).
C
1
10µF
5V
C
2
10µF
+
−
+
−
q
Voltage Tripler+Regulator
V
reg
output is given a temperature gradient, after
boosted output V
OUT
regulated. In this connection,
both V
OUT
and V
reg
can be taken out at the same
time.
1
2
3
4
5
6
7
+
–
14
13
12
11
10
9
8
R
OSC
1MΩ
5V
C
1
10µF
C
2
10µF
+
−
+
−
1
2
3
4
5
6
7
+
V
IN
=-5V
V
OUT
=-15V
V
IN
=-5V
14 R
OSC
R
1
RRV
+
C
4
13
−
10µF
12
R
2
1MΩ
100kΩ
11
~1MΩ
10
Shield wire
9
V
reg
=-8V=
8
V
OUT
=-15V
R
RV
−
R V
RV
1
C
3
10µF
C
3
10µF
Voltage Tripler
Tripler+Regulator
(-0.4%/°C selected as temperature gradient)
q
Parallel Connection
Parallel connection of n circuits can reduce R
OUT
to about
1/n, that output impedance R
OUT
can be reduced by
connecting serial configuraiton. A single smoothing
capacitor C
3
can be used commonly for all parallely
connected circuit.
In parallely connection, a regulated output can be
obtained by applying the regulation circuit to only one of
the n parallely connected circuit.
5V
C
1
+
10µF
−
C
2
−
10µF
+
1
2
3
4
5
6
7
14
13 R
OSC
12
1MΩ
11
10
9
8
+
−
C
1
10µF
C
2
10µF
+
−
+
−
1
2
3
4
5
6
7
V
IN
=-5V
C
3
10µF
14
C
4
+
13 R
OSC
10µF
−
12
R
RV
1MΩ
11
100kΩ
10
~1MΩ
9
8
Vreg=-10V
V
OUT
=-15V
Parallel Connection
q
Cascade Connection
Cascade connection of SCI7661C/M (by connecting V
IN
and V
OUT
of one stage to V
DD
and V
IN
respectively of
the next stage) further increase the output voltage. Note, however, that the serial connection increases the
output impedance.
V'
DD
=V
IN
=-15V
10µF
+
−
5V
1
2
3
4
5
6
7
14
13
12
11
10
10µF
1MΩ
10µF
+
−
+
−
1
2
3
4
5
6
7
14
13
12
11
10
9
8
V'
OUT
=-20V
+
100kΩ
1MΩ
−
10µF
9 V
OUT
=-10V
=V
IN
'
8
+
−
~
V'
reg
=-15V
V
IN
=-5V
10µF
+
−
10µF
Serial Connection
6
EPSON [ EPSON COMPANY ]
