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參數(shù)資料
| 型號： | SM8131B |
| 廠商： | Seiko NPC Corporation |
| 英文描述： | The SM8131B is a charge pump DC/DC converter that switches between 1 and 1.5 automatically. |
| 中文描述： | 該SM8131B是一個電荷泵DC / DC轉(zhuǎn)換器，1至1.5自動切換。 |
| 文件頁數(shù)： | 8/21頁 |
| 文件大?。?/td> | 218K |
| 代理商： | SM8131B |
SM8131B
NIPPON PRECISION CIRCUITS INC.—8
EN input signal and LED drive current setting (disable interval)
The LED drive current setting due to EN input is set by the 4-bit counter (16 steps). On the 17th pulse, the
counter DATA
=
1 and the current is reset to the maximum current value. When the counter DATA
=
16, I
LED
=
0mA and the LED drive circuit shuts down.
When both EN1 and EN2 are held LOW for an extended interval, the internal enable signal
“
CE
”
goes LOW
and the device enters power-save mode. In this mode, the EN input internal counter is reset and subsequent ris-
ing-edge pulses on EN restart the counter from DATA
=
1.
SEL inputs and LED control groups
The DIN1 to DIN6 6-channel LED drive pins can be divided into two groups of drive pins (EN1 control and
EN2 control drive pins) by the state of select inputs SEL1 and SEL2. Two groups with separate LED drive cur-
rent control using EN1 and EN2 allows a single device to independently adjust the backlight brightness of 2
screens. With a MODE 6:0 setting, EN2 is not used and should be connected to GND. Also, any unused DIN
LED drive pins should be connected to GND.
LED drive current setting disable interval
Table. SEL setting and LED drive pin grouping
SEL input
LED control signal
MODE
SEL1
SEL2
DIN1
DIN2
DIN3
DIN4
DIN5
DIN6
6
:
0 setting
L
L
EN1
EN1
EN1
EN1
EN1
EN1
5
:
1 setting
L
H
EN1
EN1
EN1
EN1
EN1
EN2
4
:
2 setting
H
L
EN1
EN1
EN1
EN1
EN2
EN2
3
:
3 setting
H
H
EN1
EN1
EN1
EN2
EN2
EN2
EN1 input
11 12 13 14 15 16 17 18 19 20 21
I
LED
disable signal
LED current
I
LED
off
11 12 13 1415 16
1
2
3
4
5
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SM8131B00B | 制造商:NPC 制造商全稱:Nippon Precision Circuits Inc 功能描述:The SM8131B is a charge pump DC/DC converter that switches between 1 and 1.5 automatically. |
| SM8132A | 制造商:NPC 制造商全稱:Nippon Precision Circuits Inc 功能描述:White LED Driver IC |
| SM8132AB | 制造商:NPC 制造商全稱:Nippon Precision Circuits Inc 功能描述:White LED Driver IC |
| SM8132AW | 制造商:NPC 制造商全稱:Nippon Precision Circuits Inc 功能描述:White LED Driver IC |
| SM8133B | 制造商:NPC 制造商全稱:Nippon Precision Circuits Inc 功能描述:White LED Driver IC |
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