The SX1441 is a Bluetooth System-on-Chip based on the Semtech Bluetooth Sequencer, which includes a fully programmable 8-bit application microcontroller, a high speed UART, SPI interface, RC oscillator, power management unit, and an onchip voice CODEC with DMA interface. The purpose of the SX1441 is to offer a very high level of integration requiring a minimum of external components to build complete voice and data applications whilst maintaining design flexibility. This product has been designed for ultra low power consumption and low cost solutions. By combining the SX1441 with a low power 2.4 GHz radio device such as the XE1413, from Semtech, an ultra low power Bluetooth wireless headset consuming less than 23mW @1.8V (HV3) can be built.