參數(shù)資料
型號(hào)： TPS60251RTW
廠商： Texas Instruments, Inc.
英文描述： HIGH EFFICIENCY CHARGE PUMP FOR 7 WLEDs WITH I2C INTERFACE
中文描述： 高效電荷泵7，帶有I2C接口個(gè)WLED
文件頁(yè)數(shù)： 14/28頁(yè)
文件大?。?/td> 515K
代理商： TPS60251RTW
www.ti.com
I
AUX
(100%)
1.254
R
IS
1.276
10
6
8000
3.5
10
6
10
(3)
I
AUX
(70%)
1.254
R
IS
1.276
10
6
6000
3.5
10
6
9.333
(4)
I
AUX
(40%)
1.254
R
IS
1.276
10
6
4000
3.5
10
6
8
(5)
I
AUX
(20%)
1.254
R
IS
1.276
10
6
2000
3.5
10
6
8
(6)
SERIAL INTERFACE
The serial interface is compatible with the standard and fast mode I
2
C specifications, allowing transfers at up to
400 kHz. The interface adds flexibility to the WLED driver solution, enabling most functions to be programmed to
new values depending on the instantaneous application requirements. Register contents remain intact as long
as V
CC
remains above UVLO2 (typical 1.3V) and ENA is high.
For normal data transfer, DATA is allowed to change only when CLK is low. Changes when CLK is high are
reserved for indicating the start and stop conditions. During data transfer, the data line must remain stable
whenever the clock line is high. There is one clock pulse per bit of data. Each data transfer is initiated with a
start condition and terminated with a stop condition. When addressed, the TPS60251 device generates an
acknowledge bit after the reception of each byte. The master device (microprocessor) must generate an extra
clock pulse that is associated with the acknowledge bit. The TPS60251 device must pull down the DATA line
during the acknowledge clock pulse so that the DATA line is a stable low during the high period of the
acknowledge clock pulse. Setup and hold times must be taken into account. During read operations, a master
must signal the end of data to the slave by not generating an acknowledge bit on the last byte that was clocked
out of the slave. In this case, the slave TPS60251 device must leave the data line high to enable the master to
generate the stop condition.
Data line
stable;
data valid
DATA
CLK
Change
of data
allowed
TPS60251
SLVS767–APRIL 2007
Figure 14
shows the dimming steps for sub, main, and auxiliary display banks in the 25mA maximum current
application. To satisfy today’s requirements on LED current, the TPS60251 covers low LED current area from
100
μ
A to 1.5mA with 100-
μ
A dimming step (total 16 steps for 25-mA maximum current) for the new LCD panels
which have improved transparency rates. For LED currents in the range from 2mA to 25mA, the device uses 48
dimming steps with 0.5mA step. Also, DM5 has 4 dimming steps once the current path is assigned for auxiliary
applications with maximum 80-mA current.
R
IS
also affects the current for the auxiliary application. The four current levels (20%, 40%, 70%, and 100%) are
determined by the following equations:
Figure 15. Bit Transfer on the Serial Interface
14
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS60251RTWR 功能描述:LED照明驅(qū)動(dòng)器 High Eff Charge Pump 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
TPS60251RTWRG4 功能描述:LED照明驅(qū)動(dòng)器 High Eff Charge Pump 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
TPS60251RTWT 功能描述:LED照明驅(qū)動(dòng)器 High Eff Charge Pump 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
TPS60251RTWT 制造商:Texas Instruments 功能描述:DC/DC Charge Pump Converter IC
TPS60251RTWTG4 功能描述:LED照明驅(qū)動(dòng)器 High Eff Charge Pump 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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