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AT42QT2100 Datasheet(PDF) 19 Page - ATMEL Corporation |
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AT42QT2100 Datasheet(HTML) 19 Page - ATMEL Corporation |
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19 / 44 page  19 AT42QT2100 [DATASHEET] 9554E–AT42–01/13 5. SPI Commands 5.1 Introduction Each communication exchange between the QT2100 and the host device consists of 3 bytes transmitted each way. The host controls the clock signals and the timing of the exchange. The data sent by the host indicates the command mode and the device settings where appropriate. There are four command modes, selectable through bits 5 – 7 of the first byte (byte 0, Req bits): Normal Exchange mode (Req = 000) Custom Threshold command mode (Req = 100) Send Signal command mode (Req = 001) Device Version command mode (Req = 010) The device settings sent by the host in its three command bytes becomes effective immediately after all three bytes are received by the QT2100. The response to these three bytes is three data bytes containing key detection information. 5.2 Normal Exchange Mode 5.2.1 Introduction The Normal Exchange mode (Req = 000) is the normal mode for communication between the host and the device. Data is sent every time an SPI communication occurs in Normal Exchange mode. If one of the other commands is sent by the host, the corresponding response will be sent during the subsequent 3-byte exchange. This Normal Exchange response forms the default (start-up) QT2100 data. 5.2.2 Host Data In Normal Exchange mode (Req = 000) the host sends the 3-byte data in Table 5-1. Table 5-1. Normal Exchange Mode – Host Command Bytes Host Byte Bit 7 6 5 4 3 2 1 0 0 Req = 000 PROX SLD AKS 1 0 MOD DI LPB LP Mode 2 Resolution CalW CalK Cal Key Num Note: Bits labelled 0 should not be altered |
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