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MPR121 serial communication

Posted: 08 Oct 2009 ?? ?Print Version ?Bookmark and Share

Keywords:serial communication? MPR121 communication? touch sensor?

The MPR121 uses an I?C Serial Interface. The I?C protocol implementation and the specifics of communicating with the Touch Sensor Controller are detailed in this application note.

The MPR121 operates as a slave that sends and receives data through an I2C 2-wire interface. The interface uses a Serial Data Line (SDA) and a Serial Clock Line (SCL) to achieve bi-directional communication between master(s) and slave(s). A master (typically a microcontroller) initiates all data transfers to and from the MPR121, and it generates the SCL clock that synchronizes the data transfer.

The MPR121 SDA line operates as both an input and an open-drain output. A pull-up resistor, typically 4.7 k, is required on SDA. The MPR121 SCL line operates only as an input. A pull-up resistor, typically 4.7 k, is required on SCL if there are multiple masters on the 2-wire interface or if the master in a single-master system has an open-drain SCL output.

View the PDF document for more information.

Click here to view related datasheets.

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