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.

• 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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• Number of channels (#)
• 8
• 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

LP3944的完整型号有：LP3944ISQ/NOPB、LP3944ISQX/NOPB，以下是这些产品的关键参数及官网采购报价：

LP3944ISQ/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-3-260C-168 HR，引脚镀层/焊球材料：SN，TI官网LP3944ISQ/NOPB的批量USD价格：0.814（1000+）

LP3944ISQX/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-3-260C-168 HR，引脚镀层/焊球材料：SN，TI官网LP3944ISQX/NOPB的批量USD价格：0.678（1000+）

LP3944SW-LINUX — 用于 LP3944 的 Linux 驱动程序

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 (...)

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