LP3943ISQ

• Internal power-on reset
• Low effective reset
• Internal precision oscillator
• Dimmed interest rate variable (160 Hz, 0.625 Hz from 6.25 ms to 1.6s)

illustrate

The LP3943 is an integrated device capable of independently driving 16 LEDs. The device also contains an internal precision oscillator that provides all the necessary timing required to drive each LED. Two prescaler registers and two PWM registers provide a common duty cycle control. The LP3943 contains SMBus/I for LED brightness²C, where the ability of the application to cut bus communication is required.

Traditionally, LED brightness using serial shift registers such as the 74LS594/5 would require a lot of traffic on the serial bus. LP3943, instead of just setting the frequency and duty cycle for each output pin. From then on, only a single command of one host must be set to each open-drain output, shutdown, or cyclic programming frequency and duty cycle. The maximum output sink current is 25 mA per pin at 200 mA per pack. The controlled LEDs do not use any ports and can be used for general-purpose input/output expansion.

Main specifications

• 16 LED drivers (national on, off, multiple programmable inputs, and dimming at specified speed)
• 16 open-drain outputs capable of driving up to 25% of LED current

apply

• Custom blinking LED lights for cellular phones
• Portable applications
• Digital cameras
• Light
• Universal I/O expander
• toy