5

s CIRCUIT DESCRIPTION

q C-R Oscillator

The SCI7661C/M contains a C-R oscillator for internal

connected between the OSC1 pin and OSC2 pin.

q Voltage Converters

qReference Voltage Generator and Voltage Regulator

The reference voltage generator produces reference

voltage needed for operation of regulator circuit. The

voltage regulator is used to regulate a boosted output

voltage and its circuit contains a power-off function which

uses signals from the system for on-off control of the

q Temperature Gradient Selector Circut

0.30

0.25

50

0

-50

0.20

0.15

0.10

0.05

0.00

V

-5V

V

-10V

-0.1%/

°C

-0.4%/

°C

-0.6%/

°C

V

-15V

I

Ta(

°C)

0

-50

0

50

100

510

15

20

Fig:13 Regulated Output Saturation

Temperature(Ta)

Osc1

Osc2

Osc1

Osc2

C-R Oscillation

External Clock Operation

Open

External Clock

(+5V)

(-5V)

GND

Typical Doubled Voltage Relations

Typical Tripled Voltage Relations

RV

Voltage Regulator

Control signal