SCI7631MBA View Datasheet(PDF) - Seiko Epson Corp
Part Name
Description
MFG CO.
'SCI7631MBA' PDF : 34 Pages View PDF
Timing diagram
VI1
PWCR
SCI7630 Series
Measurement circuit
VO
VO
R
PWCR
C
100 kΩ
RST
RST
tpd
PACKAGE MARKINGS
SCI7631, SCI7638 series device packages use the fol-
lowing markings.
7631
Series number
First subcode character
Second subcode character
Code number
FUNCTIONAL DESCRIPTION
Basic Voltage Booster Operation
TR1 switches ON and OFF at half the frequency of the
clock pulses from the built-in RC oscillator. When the
transistor is ON, the circuit stores energy in L. When it
is off, this energy flows through D to change C.
L
D
VI1
VO
Tr1
C
GND
GND
Internal Circuits
RC oscillator
The SCI7631, SCI7638 series use a built-in RC oscilla-
tor to drive the voltage booster circuit. The circuit is
supplied by VI1. All circuit components are on-chip
and thus the drive frequency is set internally. To ensure
50% duty, this frequency is twice that used by the volt-
age booster circuit.
When PS is LOW, the oscillator is disabled and the chip
is in standby mode.
PS
C
R
SCI7000 Series
Technical Manual
EPSON
4–13
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