User Manual

9570H–AT42–02/10

AT42QT1110-MZ/AT42QT1110-AZ

6. Report Requests

6.1 Introduction

The host can request reports from the QT1110, as summarized in Table 6-1.

Note that SPI communications are full-duplex, so the host must transmit on the MOSI pin to

keep the communications active, while reading data from the QT1110 on the MOSI pin. Failure

to do this within 100 ms will cause the device to assume that the exchange has been abandoned

and reset the SPI interface. The host should therefore send one or two “NULL” bytes, as

appropriate, on the MOSI line as it receives the 1- or 2-byte report data from the device.

6.2 First Key (0xC0)

This command returns 1-byte report in the format shown in Table 6-2.

DETECT: 0 = no key in detect; 1 = there is a key in detect.

NUMKEY: indicates the number of keys in detect:

0 = only one key is in detect (specified by “KEY_NUM”)

1 = more than one key in detect.

ERROR: 0 = there are no keys in an error state; 1 = at least one key is in error state.

KEY_NUM: the key number (0 to 10) of the key in detect (if there is only one), or the number of

the first key to go into detection when there are more than one.

Table 6-1. Report Requests

Command Code Note Data Returned

Send First Key 0xC0 Returns the first detected key 1 byte

Send All keys 0xC1 Returns all keys 2-byte bitfield

Device Status 0xC2 Returns the device status 1-byte bitfield

EEPROM CRC 0xC3 Returns the EEPROM CRC 1 byte

RAM CRC 0xC4 Returns the RAM CRC 1 byte

Error Keys 0xC5 Returns the error keys 2-byte bitfield

Signal for Key “k”' 0x2k Returns the signal for key “k” 2-byte number

Reference for Key “k” 0x4k Returns the reference for key “k” 2-byte number

Status for Key “k” 0x8k Returns error conditions/touch indication 1 byte

Detect Output States 0xC6 Returns the detect output states 1 byte

Last Command 0xC7 Returns the last command sent to QT1110 1 byte

Setups 0xC8 Returns the setup data 42 bytes

Device ID 0xC9 Returns the device ID 1 byte

Firmware Version 0xCA Returns the firmware version 1 byte

Table 6-2. Send First Key Report Format

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

Byte 0 DETECT NUMKEY ERROR

KEY_NUM