LP3944
- Internal Power-on Reset
- Active Low Reset
- Internal Precision Oscillator
- Variable Dim Rates (from 6.25 ms to 1.6s; 160 Hz–0.625 Hz)
Key Specifications
- 8 LED Driver (Multiple Programmable States—On, Off, Input, and Dimming at a Specified Rate)
- 8 Open Drain Outputs Capable of Driving up to 25 mA per LED
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LP3944 is an integrated device capable of independently driving 8 LEDs. This device also contains an internal precision oscillator that provides all the necessary timing required for driving each LED. Two prescaler registers along with two PWM registers provide a versatile duty cycle control. The LP3944 contains the ability to dim LEDs in SMBUS/I2C applications where it is required to cut down on bus traffic.
Traditionally, to dim LEDs using a serial shift register such as 74LS594/5 would require a large amount of traffic to be on the serial bus. LP3944 instead requires only the setup of the frequency and duty cycle for each output pin. From then on, only a single command from the host is required to turn each individual open drain output ON, OFF, or to cycle a programmed frequency and duty cycle. Maximum output sink current is 25 mA per pin and 200 mA per package. Any ports not used for controlling the LEDs can be used for general purpose input/output expansion.
技術資料
| 上位の文書 | タイプ | タイトル | フォーマットオプション | 最新の英語版をダウンロード | 日付 | |
|---|---|---|---|---|---|---|
| * | データシート | LP3944 RGB/White/Blue 8-LED Fun Light Driver データシート (Rev. A) | 2013/04/06 | |||
| ホワイト・ペーパー | Common LED Functions and LED Driver Design Considerations.. | 英語版 | 2020/09/21 | |||
| アプリケーション・ノート | How to Select a RGB LED Driver | 2019/08/08 | ||||
| アプリケーション・ノート | AN-1715 LP3943/LP3944 as a GPIO Expander (Rev. A) | 2013/04/30 | ||||
| ユーザー・ガイド | AN-1344 LP3944 Evaluation Kit (Rev. B) | 2013/04/30 |
設計と開発
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LP3944SW-LINUX — Linux ドライバ、LP3944 用
The Linux driver supports the LP3944 8-LED Fun Light Driver. The Linux driver supports communication through the I2C bus and interfaces with the LED sub-system.
Linux Mainline Status
Available in Linux Main line: Yes
Available through git.ti.com: N/A
Supported Devices:
- lp3944
Linux Source Files
The (...)
| パッケージ | ピン数 | CAD シンボル、フットプリント、および 3D モデル |
|---|---|---|
| WQFN (RTW) | 24 | Ultra Librarian |
購入と品質
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