SM8143A Datasheet, PDF (2/6 Pages) Nippon Precision Circuits Inc – EL Sheet Driver

BLOCK DIAGRAM
SM8143A
EL sheet
< _80cm²
VDD
LDR
CHV
OUT1 OUT2
Boosting Block
Switching Circuit
Dividing Circuit
1/4
Dividing Circuit
1/1024
VSS ENA
Oscillator for
Boosting
Oscillator for
EL driving
OCL
OCE
ROCL
Oscillation Block
ROCE
ENA from microcontroller
When ENA is logical "H", SM8143A is active.
Note: Brightness and operating current are adjusted with R_OCL .
EL driving frequency is adjusted with R_OCE .
PIN DESCRIPTION
Pin number Name
I/O
1
N.C.
–
2
CHV
I
3
N.C.
–
4
LDR
O
5
N.C.
–
6
VSS
–
7
N.C.
–
8
OCL
I
9
OCE
I
10
ENA
I
11
VDD
–
12
N.C.
–
13
OUT2
O
14
N.C.
–
15
OUT1
O
16
N.C.
–
Function
No connection (must be open)
High-voltage DC input
No connection (must be open)
Booster coil driver output
No connection (must be open)
Ground
No connection (must be open)
Coil driver oscillator (oscillator frequency determined by external resistor)
EL driver oscillator (oscillator frequency determined by external resistor)
Enable input (built-in pull-down resistor)
Supply
No connection (must be open)
Output 2
No connection (must be open)
Output 1
No connection (must be open)
NIPPON PRECISION CIRCUITS—2