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參數(shù)資料
| 型號： | LP55271 |
| 廠商： | National Semiconductor Corporation |
| 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： | 微小的LED照相機閃光燈和4的I2C可編程性，連接測試和音頻同步發(fā)光二極管驅(qū)動器 |
| 文件頁數(shù)： | 6/21頁 |
| 文件大?。?/td> | 826K |
| 代理商： | LP55271 |
Modes of Operation
20202406
RESET:
In the reset mode all the internal registers are reset to the default values. Reset is entered always if input
NRST is LOW or internal Power On Reset (POR) is active. Power on reset will activate during the chip
startup or when the supply voltage V
falls below 1.5V. Once V
rises above 1.5V, POR will inactivate
and the chip will continue to the STANDBY mode. NSTBY control bit is low after POR by default.
The standby mode is entered if the register bit NSTBY is LOW and reset is not active. This is the low power
consumption mode, when all circuit functions are disabled. Registers can be written in this mode and the
control bits are effective immediately after start up.
When NSTBY bit is written high, the internal startup sequence powers up all the needed internal blocks
(V
REF
, Oscillator, etc.). To ensure the correct oscillator initialization, a 10 ms delay is generated by the
internal state-machine. If the chip temperature rises too high, the thermal shutdown (TSD) disables the chip
operation and startup mode is entered until no thermal shutdown event is present.
BOOST STARTUP:
Soft-start for boost output is generated in the boost startup mode. The boost output is raised in a low current
PWM mode during the 10 ms delay generated by the state-machine. The boost startup is entered from
internal startup sequence if EN_BOOST is HIGH or from normal mode when EN_BOOST is written HIGH.
NORMAL:
During normal mode the user controls the chip using the Control Registers. The registers can be written in
any sequence and any number of bits can be altered in a register in one write.
STANDBY:
STARTUP:
L
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| LP5527 | Tiny LED Driver for Camera Flash and 4 LEDs with I2C Programmability, Connectivity Test and Audio Synchronization |
| LP5527TL | Tiny LED Driver for Camera Flash and 4 LEDs with I2C Programmability, Connectivity Test and Audio Synchronization |
| LP5527TLX | Tiny LED Driver for Camera Flash and 4 LEDs with I2C Programmability, Connectivity Test and Audio Synchronization |
| LP55281 | Quad RGB Driver |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LP55271TL | 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 |
| LP55271TL/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 |
| 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 |
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