SM8142
BLOCK DIAGRAM
ꢀ SM8ꢀ42A
ꢀ SM8ꢀ42B
EL sheet
EL sheet
VDD
LDR
CHV
OUT1
OUT2
VDD
LDR
CHV
OUT1
OUT2
High Voltage
High Voltage
Switching Circuit
Switching Circuit
Dividing Circuit
Dividing Circuit
Dividing Circuit
Dividing Circuit
Oscillator for
Boosting Voltage
Oscillator for
EL Driving
Oscillator for
Boosting Voltage and EL Driving
OCE
VSS
OSC
ENA
VSS
OCL
PIN DESCRIPTION
Pin numbe r
Ver.
Na me
I / O
Function
VSOP-8
SON-8
1
2
3
7
8
1
A/B
A/B
A/B
A
CHV
LDR
VS S
OCL
I
O
–
I
High-voltage DC input
Booster coil driver output
Ground
Coil driver oscillator (oscillator frequency determined by external resistor)
4
5
2
3
Coil and EL driver oscillator
(oscillator frequency determined by external resistor)
B
OS C
I
I
A
OCE
ENA
EL driver oscillator (oscillator frequency determined by external resistor)
1
B
Ip
Enable input (HIGH: enable, LOW: disable)
6
7
8
4
5
6
A/B
A/B
A/B
VDD
–
O
O
Supply
OUT2
OUT1
Output 2
Output 1
1. Built-in pull-down resistor
NIPPON PRECISION CIRCUITS—3
NPC [ NIPPON PRECISION CIRCUITS INC ]
