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AT42QT1110-AU Datasheet(PDF) 11 Page - ATMEL Corporation |
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AT42QT1110-AU Datasheet(HTML) 11 Page - ATMEL Corporation |
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11 / 50 page  11 AT42QT1110-MU / AT42QT1110-AU [DATASHEET] 9520J–AT42–05/2013 When the QT1110 is expecting a CRC byte, it returns (on MISO) the calculated CRC byte which it expects to receive. This is sent simultaneously with the QT1110 receiving the CRC byte from the master (that is, during the same byte exchange). This allows both devices to confirm that the data was sent correctly. All data returned by the QT1110 is also be followed by a CRC byte, allowing the master to confirm the integrity of the data transmission. 4.1.4 SPI Commands There are three types of communication between the SPI master and the QT1110: Control commands (see Section 5. on page 22) To send control instructions to the QT1110 Report requests (see Section 6. on page 24) To reading status information from the QT1110 Setup commands (see Section 7. on page 28) 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 QT1110. 4.1.4.1 Control Commands A control command is an instruction sent to the QT1110 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 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) |
Similar Part No. - AT42QT1110-AU_14 |
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