SM8144B Datasheet, PDF (2/6 Pages) Nippon Precision Circuits Inc – EL Sheet Driver

BLOCK DIAGRAM
SM8144B
EL sheet
< _80cm²
VDD
LDR
CHV
OUT1 OUT2
Boosting Block
Switching Circuit
Dividing Circuit
1/4
Dividing Circuit
1/1024
Oscillator for
Boosting and EL driving
VSS
OSC
ENA
ROSC
Oscillation Block
ENA from microcontroller
When ENA is logical "H", SM8144B is active.
PIN DESCRIPTION
Pin number Name
I/O
1
CHV
I
2
LDR
O
3
VSS
–
4
OSC
I
5
ENA
I
6
VDD
–
7
OUT2
O
8
OUT1
O
Function
High-voltage DC input
Booster coil driver output
Ground
Coil and EL driver oscillator (oscillator frequency determined by external resistor)
Enable input (built-in pull-down resistor)
Supply
Output 2
Output 1
NIPPON PRECISION CIRCUITS—2