AT42QT1110-MU Ver la hoja de datos (PDF) - Atmel Corporation

Número de pieza

componentes Descripción

Fabricante

AT42QT1110-MU

11-key QTouch® Touch Sensor IC

Atmel Corporation 

For example, Figure 4-3 on page 12 shows the exchange that takes place to read the 2-byte All Keys report. In this

exchange, the host sends:

0xC1 — 0x00 — 0x00

and the QT1110 returns (simultaneously):

0x55 — Report Byte 0 — Report Byte 1

If CRC is enabled, this exchange is extended to 5 bytes, as shown in Figure 4-4.

Figure 4-4. All Keys Report – CRC Enabled

Host (Sends on MOSI)

Device (Responds on MISO)

Command: 0xC1

Response: 0x55 (“Idle” – Fresh Command)

Simultaneous

Transmission

Command CRC: 0x94

Response: 0x94 (Expected Command CRC)

Null: 0x00

Key Status Report Byte 0

Null: 0x00

Key Status Report Byte 1

Null: 0x00

Report CRC: 0x??

4.1.5.1 Set Instructions

Set Instructions are 2-byte transmissions by the host that are used to send settings to individual locations in the

device memory map.

At the first byte, the QT1110 returns 0x55 (Idle) to confirm that it will interpret the byte as a new command. At the

second byte, the QT1110 returns the Set command it has just received.

For example, to set the Positive Recalibration Delay to 1920 ms, address 5 in the memory map is set to 12 (0x0C).

This is done with the Set command for address 5 (command code 0x95), as shown in Figure 4-5 on page 14.

AT42QT1110-MU / AT42QT1110-AU [DATASHEET]

13

9520J–AT42–05/2013

Share Link: