cd3269a0 document

The CD3272 and CD3269 operate together as a chipset to enable remote button detection via a microphone bias line. The CD3269 is a MEMS microphone interface and button decoder device which transmits remote button activity of a switch-resistor network back to the CD3272. The CD3272 is powered from a battery and controlled by a host device. It provides regulated downstream power (2.7V or 2.0V) to the CD3269 and MEMS microphone through the microphone bias line. The CD3272 also decodes the button information from the CD3269 and switch-resistor network to provide communication to the host device via I2C interface (SCL, SDA) and interrupt (INT\). The CD3269 is physically located at the microphone and button end of the microphone bias line and the CD3272 is located at the host end of the line.