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參數(shù)資料
| 型號： | LP3958TLX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 顯示驅(qū)動器 |
| 英文描述： | Lighting Management Unit with High Voltage Boost Converter |
| 中文描述： | LED DISPLAY DRIVER, PBGA25 |
| 封裝： | 2.54 X 2.54 MM, 0.60 MM HEIGHT, 0.50 MM PITCH, LEAD FREE, MICRO SMD PACKAGE-25 |
| 文件頁數(shù)： | 12/28頁 |
| 文件大?。?/td> | 1091K |
| 代理商： | LP3958TLX |
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Functionality of Keypad LED
Outputs (KEY1, KEY2, KEY3)
LP3958 has three individual keypad LED output pins. Output
pins can be used in switch mode or constant current mode.
Output mode can be selected with the control register (ad-
dress 00H) bit CC_SW. If the bit is set high, then keypad
LED outputs are in switch mode, otherwise in constant cur-
rent mode. These modes are described later in separate
chapters.
Keypad LED output control can be done in three ways:
1.
Defining the expected balance and brightness in Keypad
register (address 01H)
2.
Direct setting each LED ON/OFF via Keypad control
register (address 00H)
3.
External PWM control
BRIGHTNESS CONTROL WITH KEYPAD REGISTER
If the keypad LED output is used by defining the balance and
brightness in the Keypad register, then one needs to set
EN_KEYP bit high and KEYP_PWM bit high in the Control
register (address 00H). K1SW, K2SW and K3SW are used
to enable each LED output, enabled when written high.
CC_SW defines the LED output mode. A single register is
used for defining the balance and brightness for keypad LED
output:
KEYPAD REGISTER (01H)
Bit
Description
6:4
Balance of KEY1, KEY2 and
KEY3 outputs
3:1
Brightness control
0
Overlapping mode selection:
0 = non-overlapping mode
1 = overlapping mode
Name
BALANCE[2:0]
BRIGHT[2:0]
OVL
Brightness control is logarithmic and is programmed as fol-
lows:
Bright[2:0]
Brightness [%]
Ratio to max
brightness
0
1/64
1/32
1/16
1/8
1/4
1/2
1/1
000
001
010
011
100
101
110
111
0
1.56
3.12
6.25
12.5
25
50
100
The LED balance can be selected as follows. This is valid
only in non-overlapping mode.
Balance
[2:0]
000
001
010
011
100
101
110
111
KEY1
active [%]
100
0
0
50
0
50
33
50
KEY2
active [%]
0
100
0
50
50
0
33
25
KEY3
active [%]
0
0
100
0
50
50
33
25
OVERLAPPING MODE
The brightness is controlled using PWM duty cycle based control method as the following figure shows.
20175597
Overlapping Mode
Since KEY outputs are on simuneltaneously, the maximum load peak current is:
I
MAX
= I(KEY1)
MAX
+ I(KEY2)
MAX
+ I(KEY3)
MAX
NON-OVERLAPPING MODE
The timing diagram shows the splitted KEY1, KEY2 and KEY3 and brightness control effect to splitted parts. Full brightness is
used in the diagram. If for example
1
2
brightness is used, the frame is still 50μs, but all LED outputs’ ON time is 50% shorter and
at the last 25μs all LED outputs are OFF.
L
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LP3958TLX/NOPB | 功能描述:LED照明驅(qū)動器 RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| LP395Z | 功能描述:兩極晶體管 - BJT RoHS:否 制造商:STMicroelectronics 配置: 晶體管極性:PNP 集電極—基極電壓 VCBO: 集電極—發(fā)射極最大電壓 VCEO:- 40 V 發(fā)射極 - 基極電壓 VEBO:- 6 V 集電極—射極飽和電壓: 最大直流電集電極電流: 增益帶寬產(chǎn)品fT: 直流集電極/Base Gain hfe Min:100 A 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PowerFLAT 2 x 2 |
| LP395Z | 制造商:Texas Instruments 功能描述:POWER TRANSISTOR TO-92-3 395 |
| LP395Z/LFT1 | 功能描述:兩極晶體管 - BJT RoHS:否 制造商:STMicroelectronics 配置: 晶體管極性:PNP 集電極—基極電壓 VCBO: 集電極—發(fā)射極最大電壓 VCEO:- 40 V 發(fā)射極 - 基極電壓 VEBO:- 6 V 集電極—射極飽和電壓: 最大直流電集電極電流: 增益帶寬產(chǎn)品fT: 直流集電極/Base Gain hfe Min:100 A 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PowerFLAT 2 x 2 |
| LP395Z/LFT2 | 功能描述:兩極晶體管 - BJT RoHS:否 制造商:STMicroelectronics 配置: 晶體管極性:PNP 集電極—基極電壓 VCBO: 集電極—發(fā)射極最大電壓 VCEO:- 40 V 發(fā)射極 - 基極電壓 VEBO:- 6 V 集電極—射極飽和電壓: 最大直流電集電極電流: 增益帶寬產(chǎn)品fT: 直流集電極/Base Gain hfe Min:100 A 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PowerFLAT 2 x 2 |
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