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參數(shù)資料
| 型號： | LP55281TLX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 顯示驅(qū)動器 |
| 英文描述： | Quad RGB Driver |
| 中文描述： | LED DISPLAY DRIVER, PBGA36 |
| 封裝： | 3 X 3 MM, 0.60 MM HEIGHT, 0.50 MM PITCH, MICRO SMD-36 |
| 文件頁數(shù)： | 17/28頁 |
| 文件大?。?/td> | 1313K |
| 代理商： | LP55281TLX |
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LED TEST PROCEDURE
An example of LED test sequence is presented here. Note, that user can use incremental write sequence on I
2
C. The test sequence
consists of the basic setup and measurement phases for all RGB LEDs and Boost voltage.
Basic setup phase for the device:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10. Set the preferred value for BLUE3 (write 3Fh, 7Fh, BFh or FFh to register 08h)
11. Set the preferred value for RED4 (write 3Fh, 7Fh, BFh or FFh to register 09h)
12. Set the preferred value for GREEN4 (write 3Fh, 7Fh, BFh or FFh to register 0Ah)
13. Set the preferred value for BLUE4 (write 3Fh, 7Fh, BFh or FFh to register 0Bh)
14. Set the preferred value for ALED (write 01h - FFh to register 0Ch)
15. Dummy write: 00h to register 0Dh (Only if the incremental write sequence is used)
16. Dummy write: 00h to register 0Eh (Only if the incremental write sequence is used)
17. Set preferred boost voltage (write 00h - FFh to register 0Fh)
18. Set preferred boost frequency (write 00h - 07h to register 10h, PWM frequency can be anything)
19. Enable boost and RGB drivers (write CFh to register 11h)
20. Wait 20 ms for the device and boost startup
Give reset to LP55281 (by power on, NRST pin or write any data to register 60h)
Set the preferred value for RED1 (write 3Fh, 7Fh, BFh or FFh to register 00h)
Set the preferred value for GREEN1 (write 3Fh, 7Fh, BFh or FFh to register 01h)
Set the preferred value for BLUE1 (write 3Fh, 7Fh, BFh or FFh to register 02h)
Set the preferred value for RED2 (write 3Fh, 7Fh, BFh or FFh to register 03h)
Set the preferred value for GREEN2 (write 3Fh, 7Fh, BFh or FFh to register 04h)
Set the preferred value for BLUE2 (write 3Fh, 7Fh, BFh or FFh to register 05h)
Set the preferred value for RED3 (write 3Fh, 7Fh, BFh or FFh to register 06h)
Set the preferred value for GREEN3 (write 3Fh, 7Fh, BFh or FFh to register 07h)
Measurement phase:
1.
2.
3.
4.
5.
Enable LED test and select output (write 1xh to register 12h)
Wait for 128 μs
Read ADC output (read register 13h)
Go to step 1 of measurement phase and define next output to be measured as many times as needed
Disable LED test (write 00h to register 12h) or give reset to the device (see step 1 in basic setup phase)
LED TEST TIME ESTIMATION
Assuming the maximum clock frequencies used in SPI or I
2
C
compatible interfaces, the following table predicts the overall
test sequence time for the test procedure shown above. This
estimation gives the shortest time possible. Incremental write
is assumed with I
2
C. Reset and LED test disable are not in-
cluded.
Test Phase
Time (ms)
I
2
C
SPI
Setup
0.528
20
4.137
24.7
0.024
20
1.831
21.9
Boost startup
14 measurements
Total Time
17
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| LP55281TLX/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 |
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| LP5550SQ | 功能描述:電池管理 RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| LP5550SQ/NOPB | 功能描述:電池管理 RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
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