Half of the country introduced the need to program the acousto-optic synchronization LED driver

National Semiconductor Corporation Ns (National Semiconductor Corporation, referred to as the country's half) the day before announcing the launch of a "no programming" Boomer acousto-optic synchronous light emitting diode (LED) driver IC LM4970. The chip can provide a number of options, so that system design engineers can use I2C compatible lighting mode control function, but also the use of sound and light synchronization of the automatic control of the lighting mode. If you use the automatic mode, you do not need to use the software or memory storage space, but also to control the light flashing mode, so that the memory can make more space to support other functions. In addition, the design engineer can also use the I2C compatible control bus to open or close each drive, so as to control the brightness of the LED, as well as to change the high-frequency and intermediate frequency band. Due to the chip with internal control function, so it can reduce the number of external components, help narrow the area of the circuit board, cellular mobile phones, MP3 players, personal digital assistants and other portable electronic products more compact and slim size.

LM4970 chip without the real-time control software can also give full play to the lighting effect of LED. Acousto optical synchronous mode three audio input signals can be mixed together, after filtering, and then into three different frequency bands, and each band can be allocated to a particular pulse width modulation (PWM) LED driver. This chip contains three separate pulse width modulation color LED driver, can provide up to 42mA of each LED output drive current. In addition, the function of these three drives can also be set directly through the I2C compatible interface, so that users can set their own preferences in accordance with the LED light-emitting mode, color and light. LM4970 chip is also equipped with brightness control function, so that users can set their own preferences in accordance with the light of each LED. This chip system and if the national semiconductor Boomer audio (such as LM4857) collocation use, can provide highly original 3D stereo sound effect for portable electronic products, also can ensure the decorative light and shining with the rhythm of the music.

LM4970 chip 14 pin LLP package, with 1000 procurement units, single price of US $0.90 (for reference), and has a lot of cash supply. In addition, this chip is also available without lead packaging options.