SM8142
BLOCK DIAGRAM
I
SM8142A
I
SM8142B
EL sheet
EL sheet
VDD
LDR
CHV
OUT1
OUT2
VDD
LDR
CHV
OUT1
OUT2
High Voltage
Switching Circuit
High Voltage
Switching Circuit
Dividing Circuit
Dividing Circuit
Dividing Circuit
Dividing Circuit
Oscillator for
Boosting Voltage
VSS
OCL
Oscillator for
EL Driving
OCE
VSS
Oscillator for
Boosting Voltage and EL Driving
OSC
ENA
PIN DESCRIPTION
Pin nu m b e r
Ver.
VSOP-8
1
2
3
SON-8
7
8
1
A/B
A/B
A/B
A
4
2
B
A
5
6
7
8
3
B
4
5
6
A/B
A/B
A/B
ENA
VDD
OUT2
OUT1
OSC
OCE
I
I
Ip
1
–
O
O
CHV
LDR
VSS
OCL
I
O
–
I
High-voltage DC input
Booster coil driver output
Ground
Coil driver oscillator (oscillator frequency determined by external resistor)
Coil and EL driver oscillator
(oscillator frequency determined by external resistor)
EL driver oscillator (oscillator frequency determined by external resistor)
E n a ble input (HIGH: enable, LOW : disable)
Supply
Output 2
Output 1
Name
I/O
Function
1. Built-in pull-down resistor
NIPPON PRECISION CIRCUITS—3
NPC [ NIPPON PRECISION CIRCUITS INC ]
