SM8146AD1 データシートの表示（PDF） - Nippon Precision Circuits
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SM8146AD1 Datasheet PDF : 19 Pages
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SM8146AD1
EL Brightness Adjustment
The SM8146AD1 EL brightness can be adjusted using a combination of two methods: (1) EL drive voltage
control and (2) EL drive frequency control.
(1) EL Brightness Adjustment using EL Drive Voltage
This dimming function changes the EL brightness in response to the EL drive voltage determined by the num-
ber of input pulses on the DIM pin. An internal counter is used to count the number of DIM input pulses and
the OUT1/OUT2 EL drive voltage amplitude level changes in response, varying the EL brightness. The 3-bit
internal counter provides 8-step adjustment (DATA 0 to 7). On the 7th pulse (DATA = 7), the EL sheet is turned
OFF. On the 8th pulse (DATA = 0), the voltage is set to the default value (maximum brightness). Since the
default value provides the maximum brightness, the DIM pin should be connected to GND when the dimming
function is not used.
Table 1. OUT1/OUT2 pins voltage amplitude and DIM pin input pulse count
DATA
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
DIM pin input pulse count
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
OUT1/OUT2 pins voltage amplitude
85V
78V
71V
64V
57V
50V
43V
0V
DATA
7
DATA
0
DATA
1
DATA
6
Standby
DATA
2
DATA
5
DATA
4
DATA
3
DIM pin pulse input
ENA pin = "High" "Low"
ENA pin = "Low" "High"
Transition diagram of IC internal state by ENA and DIM pins
20
18
16
14
12
10
8
6
4
2
0
0
Voltage amplitude
Brightness
123456
DIM pin input pulse
100
90
80
70
60
50
40
30
20
10
0
7
DIM pin input pulse count vs. EL brightness, OUT1/OUT2 pins voltage amplitude
SEIKO NPC CORPORATION —6
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