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AT42QT1111-AU Datasheet(PDF) 11 Page - ATMEL Corporation |
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AT42QT1111-AU Datasheet(HTML) 11 Page - ATMEL Corporation |
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11 / 50 page  11 AT42QT1111-MU / AT42QT1111-AU [DATASHEET] 9571C–AT42–05/2013 4.1.4 SPI Commands There are three types of communication between the SPI master and the QT1111: Control commands (see Section 5. on page 21) To send control instructions to the QT1111 Report requests (see Section 6. on page 23) To reading status information from the QT1111 Setup commands (see Section 7. on page 27) To set configuration options (“Set” instructions) To read configuration options (“Get” instructions) Additionally the NULL command (0x00) is transmitted by the host device as it is receiving data from the QT1111. 4.1.4.1 Control Commands A control command is an instruction sent to the QT1111 that controls operations of the device, and for which no response is required. Examples of control commands are: Reset, Calibrate, Send Setups. With the exception of Send Setups, control commands normally require a single byte exchange, unless CRC checking is enabled, in which case a second byte must be transmitted by the host with the calculated CRC of the command byte. Figure 4-1. Sleep Command – CRC Disabled Figure 4-2. Sleep Command – CRC Enabled When the Send Setups command is received, the QT1111 stops measurement of QTouch sensors and waits for 42 bytes of data to be sent. Only when all 42 bytes have been received (and the CRC byte, if CRC is enabled), the QT1111 applies all the settings to RAM and resumes measurement. In this case, if CRC is enabled, the CRC byte is calculated for all the data sent by the host, including the command byte 0x01. Control Commands are specified in detail in Section 5. on page 21. Host (Sends on MOSI) Device (Responds on MISO) Simultaneous Transmission Command: 0x05 Response: 0x55 ( Idle” Fresh Command) “ – Host (Sends on MOSI) Command: 0x05 Simultaneous Transmission Command CRC: 0x3F Response: 0x3F (Expected Command CRC) Response: 0x55 ( Idle” Fresh Command) “ – Device (Responds on MISO) |
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