The LP3943 is an integrated device capable of independently driving 16 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 LP3943 contains the ability to dim LEDs in SMBUS/I²C applications where it is required, to cut down on bus traffic.

Traditionally, dimming LEDs using a serial shift register such as 74LS594/5 requires a large amount of traffic on the serial bus. The LP3943 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 to an ON or OFF state, 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.

For all available packages, see the orderable addendum at the end of the data sheet.

• Internal Power-On Reset
• Active Low Reset
• Internal Precision Oscillator
• Variable Dim Rates (From 6.25 ms to 1.6 s; 160 Hz to 0.625 Hz)
• 16 LED Drivers (Multiple Programmable States: ON, OFF, Input, and Dimming at a Specified Rate)
• 16 Open-Drain Outputs Capable of Driving up to 25 mA per LED

• Number of channels (#)
• 16
• LED current per channel (mA)
• 25
• LED configuration
• Parallel
• Program memory
• No
• Programmable ramp control
• No
• Vin (Min) (V)
• 2.3
• Vin (Max) (V)
• 5.5
• Iout (Max) (A)
• 0.2
• Features
• I2C control
• Iq (Typ) (mA)
• 0.35
• Shutdown current (Typ) (uA)
• 2
• Operating temperature range (C)
• -40 to 85
• Rating
• Catalog

LP3943的完整型号有：LP3943ISQ、LP3943ISQ/NOPB、LP3943ISQX/NOPB，以下是这些产品的关键参数及官网采购报价：

LP3943ISQ，工作温度：-40 to 85，封装：WQFN (RTW)-24，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SNPB，TI官网LP3943ISQ的批量USD价格：1.26（1000+）

LP3943ISQ/NOPB，工作温度：-40 to 85，封装：WQFN (RTW)-24，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LP3943ISQ/NOPB的批量USD价格：.976（1000+）

LP3943ISQX/NOPB，工作温度：-40 to 85，封装：WQFN (RTW)-24，包装数量MPQ：4500个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LP3943ISQX/NOPB的批量USD价格：.813（1000+）

LP3943ISQEV — RGB/白光/蓝光 16 LED 趣味闪烁光驱动器

RGB/White/Blue 16-LED Fun Light Driver

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LP3943SW-LINUX — 用于 LP3943 的 Linux 驱动程序

The Linux driver supports the LP3943 16-LED Fun Light Driver. The Linux driver supports communication through the I2C bus and interfaces with the GPIO and PWM sub-systems.

Linux Mainline Status

Available in Linux Main line: Yes
Available through git.ti.com: N/A

Supported Devices:

• lp3943

Linux Source (...)

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PSpice for TI 可提供帮助评估模拟电路功能的设计和仿真环境。此功能齐全的设计和仿真套件使用 Cadence 的模拟分析引擎。PSpice for TI 可免费使用，包括业内超大的模型库之一，涵盖我们的模拟和电源产品系列以及精选的模拟行为模型。

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