National Semiconductor has announced a programming-free Boomer A/S synchronous LED driver IC, the LM4970. The chip offers multiple options that allow system designers to use both I2C-compatible light mode control and optional sound. Light synchronization automatically controls the light mode.
With the automatic mode, you can control the flashing mode without using software or occupying memory storage space, allowing the memory to free up more space to support other functions. In addition, design engineers can turn each driver on or off with an I2C-compatible control bus to flexibly control the brightness of the LEDs and to change the high and mid frequency bands.
Thanks to the internal control function, this chip can reduce the number of external components, help reduce the board area, and make the cellular mobile phone, MP3 player, personal digital assistant and other portable electronic products smaller. thin.
The LM4970 chip can fully utilize the LED lighting effects without real-time control of the software. The acousto-optic sync mode mixes the three audio input signals together, filters them into three different frequency bands, and each band can be assigned to a specific pulse width modulation (PWM) LED driver. .
The chip contains three separate pulse-width modulated color LED drivers that deliver up to 42mA of output drive current per LED. In addition, the functions of these three drivers can also be set directly through the I2C compatible interface, so that users can set the LED's illumination mode, color and lightness according to their own preferences. The LM4970 chip also features a brightness control function that allows the user to set the dimming of each LED to their liking.
The LM4970 is available in a 14-pin LLP package and is priced at $0.90 each in 1,000-unit quantities (available for reference only) and is available from stock. In addition, this chip is available in a lead-free package.
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