參數(shù)資料
型號(hào)： LP55271TL
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： 顯示驅(qū)動(dòng)器
英文描述： Tiny LED Driver for Camera Flash and 4 LEDs with I2C Programmability, Connectivity Test and Audio Synchronization
中文描述： LED DISPLAY DRIVER, PBGA30
封裝： 2.5 X 3 MM, 0.60 MM HEIGHT, BGA-30
文件頁(yè)數(shù)： 17/21頁(yè)
文件大?。?/td> 826K
代理商： LP55271TL
I
2
C Compatible Interface
(Continued)
10
C
b
Bus Free Time between a STOP and a START Condition
Capacitive Load for Each Bus Line
NOTE:
Data guaranteed by design
1.3
10
μs
pF
200
Test Interface
The test bus can be controlled externally or internally. For
the external control, the LP55271 pins V
only need to
be powered. External control is independent on status of
NRST and V
DDIO
pins. T1 is an input and it has an internal 6
k
pull-down resistor. T2 is an output line for the test result
with an internal 200 k
pull-down resistor. When T1 is low,
T2 is always pulled down; when T1 is high, T2 is indicating
the result of the test.
20202419
High Level Schematic Representation of the Test Interface
The device is capable of detecting a defective unit in three
cases:
Production test 1:
The LP55271 is assembled on a
printed wiring board (PWB), but there is no LEDs con-
nected on current sink outputs. An external 4.2V test
voltage is supplied on the V
DD1
and V
DD2
pins, from
which follows that the reset operating mode is entered
with POR. Test pin T1 is pulled high. The chip will send an
acknowledge “1” onto the T2 pin if the chip is in working
order; otherwise T2 stays low (0). Refer to Test Interface
Timing Diagram.
Production test 2:
The LP55271 is assembled on a
PWB with the external components shown in LP55271
Block Diagram. 4.2V voltage is connected to V
, V
and FB pins (see the figure above), from which follows
that the reset operating mode is entered with POR. Test
pin T1 is pulled high. The chip will send an acknowledge
“1” onto the T2 pin if the chip is in working order; other-
wise T2 stays low (0). If the ACK is “1”, a repetitive test
pattern “0-1-0-1-0-1-0-1-0-1-0-1” is applied to T1 pin and
if the LED corresponding the pattern (see Test Interface
Timing Diagram) is connected properly T2 gives “1”, oth-
erwise T2 stays low. The last “1” disengages the test.
Field test:
Build-in self-test through the I
2
C compatible
control interface. The LP55271 is enabled (NSTBY(bit) =
1, EN_BOOST(bit) = 1) and external test pins T1 and T2
are disconnected. The result can be read through the I
2
C
compatible control interface. LED test is enabled by writ-
ing to address 0Ch hex data 01h. Result can be read
from the same address during the next I
2
C cycle. Note:
I
2
C compatible interface clock signal controls the timing
of the test procedure. For that reason the clock signal
frequency should be 50 kHz or less during the build-in
self-test.
L
www.national.com
17
相關(guān)PDF資料
PDF描述
LP55271TLX Tiny LED Driver for Camera Flash and 4 LEDs with I2C Programmability, Connectivity Test and Audio Synchronization
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參數(shù)描述
LP55271TL/NOPB 功能描述:LED照明驅(qū)動(dòng)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
LP55271TLX 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Tiny LED Driver for Camera Flash and 4 LEDs with I2C Programmability, Connectivity Test and Audio Synchronization
LP55271TLX/NOPB 功能描述:LED照明驅(qū)動(dòng)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
LP5527TL 制造商:Texas Instruments 功能描述:DRIVER FLASH LED I2C POWERWISE
LP5527TL/NOPB 功能描述:LED照明驅(qū)動(dòng)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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