
SCI7654M
0A
/C
0A
6
Function Status
Regulator
ON
OFF (*2)
ON
Mode
PS1
PS2
PS3
POFF1
POFF2
Oscillator
ON
OFF
OFF
Booster
ON
OFF (*1)
ON
Description
H(V
DD
)
L
H
L(V
IN
)
L
H
All circuits are turned ON.
All circuits are turned OFF.
Slave side (booster and regulator)
in parallel connection
Master side (for booster only)
in parallel connection; first stage
in serial connection (*3)
PS4
L
H
ON
ON
OFF
*1 When the booster circuit is OFF, approximately V
IN
+0.6V voltage appears at V
OUT
pin.
*2 When the regulator is OFF, the V
REG
pin is set to the high-impedance status.
*3 The mode selected depends on the line connection at the second stage of serial connection.
Voltage Regulator Circuit
The circuit receives a voltage from V
RI
pin, stabilizes it, and outputs at any voltage. The output is adjustable with
a ratio of R1 and R2 external divider resistors. Although the sum of divider resistors is desirable to be minimum
to prevent an interference due to external noise, 100 to 1 megohms are recommended as the current
consumption may be increased by the divider resistors.
Power Off Control
The SCI7654 has an automatic power-off function, and can turn on or off each function depending on the external
signals entered in POFF1 and POFF2 pins.
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
OUT
V
RI
V
REG
RV
V
DD
FC
TC1
TC2
C2P
C2N
C3N
C1N
C1P
V
IN
POFF1
POFF2
R
2
R
1