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Part No.	AT42QT1110-AU_14
Manufacturer	ATMEL
Size	693 Kbytes
Pages	50 pages
Description	11-key QTouch Touch Sensor IC

Datasheet Summary with AI

1. Introduction: QT1110 Communication Overview

· This document describes communication with the QT1110 capacitive touch controller.
· It uses the SPI interface.
· Key concepts include: Control Commands, Report Requests, Set Instructions, and Get Instructions.

2. Report Requests

· Used to retrieve status information (e.g., key status, sensor readings).
· The host sends a command byte, and the QT1110 returns a series of data bytes (potentially preceded by a "busy" marker).
· With CRC enabled, the communication involves extra bytes for CRC checks.

3. Set Instructions

· Used to write data to the QT1110's memory map (configuration settings, etc.).
· The Host transmits the Set command byte.
· The QT1110 responds with the same command byte ("echo") and a "busy" marker byte.
· Data is *not* applied until the CRC check is successful.

4. Get Instructions

· Used to read data from the QT1110's memory map.
· The Host sends a Get command byte.
· The QT1110 responds with the data byte located at the specified address.

5. CRC (Cyclic Redundancy Check)

· Optional but highly recommended for data integrity.
· Requires calculating and transmitting CRC bytes during command sequences.
· The QT1110 calculates a CRC value which it transmits during the communication. The Host must compare its calculated CRC value with the value provided by the QT1110.

Key Terminology & Commands

· Control Commands: Initiate specific actions like resetting or measuring.
· Report Requests: Retrieve sensor data or status.
· Set Instructions: Write configuration data to memory.
· Get Instructions: Read data from memory.
· Null Byte (0x00): Used as a placeholder or marker during communication.
· "Idle" Marker (0x55): Indicates that the device is ready for the next command.
· CRC: Used for data validation.

Important Notes

· The documentation is highly technical and assumes a level of familiarity with SPI communication and embedded systems.
· CRC is critical for reliable operation.
· The order of bytes and their significance are crucial to understanding the communication process.