AT42QT1110-AU_14 Datasheet, PDF (25/50 Pages) ATMEL Corporation – 11-key QTouch Touch Sensor IC

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.
6.3 All Keys (0xC1)
Returns a 2-byte bit-field report indicating the detection status of all 11 keys.
Table 6-3. Send All Keys Report Format
Byte 0
Byte 1
Bit 7
KEY_7
Bit 6
KEY_6
Bit 5
KEY_5
Bit 4
KEY_4
Bit 3
KEY_3
Bit 2
KEY_10
KEY_2
Bit 1
KEY_9
KEY_1
Bit 0
KEY_8
KEY_0
KEY_n: 0 = key n out of detect, 1 = key n in detect (where n is 0 – 10).
6.4 Device Status (0xC2)
This command returns a 1-byte bit-field report indicating the overall status of the QT1110.
Table 6-4. Device Status Report Format
Byte 0
Bit 7
1
Bit 6
DETECT
Bit 5
CYCLE
Bit 4
ERROR
Bit 3
Bit 2
CHANGE EEPROM
Bit 1
RESET
Bit 0
GUARD
Bits 7 is always 1; the other bits are as follows:
DETECT: 0 = no key in detect, 1 = at least 1 key in detect.
CYCLE: 0 = cycle time is good, 1 = cycle time over-run. A cycle time over-run occurs when it takes longer to
measure and process all the keys than the assigned cycle time.
ERROR: 0 = no key in error state, 1 = at least 1 key in error.
CHANGE: 0 = CHANGE pin is asserted, 1 = CHANGE pin is floating.
EEPROM: 0 = EEPROM is good, 1 = EEPROM has an error. If there are no settings stored in EEPROM, the
EEPROM error bit is set and a zero EEPROM CRC is returned.
RESET: set to 1 after power-on or reset, cleared when “Device Status” is read.
GUARD: 0 = guard channel is not in detect, 1 = guard channel is active or in detect. This bit will be zero if the guard
channel is not enabled.
6.5 EEPROM CRC (0xC3)
This command returns a 1-byte CRC checksum for the setup data in EEPROM.
6.6 RAM CRC (0xC4)
This command returns a 1-byte CRC checksum for the setup data in RAM.
AT42QT1110-MU / AT42QT1110-AU [DATASHEET]
25
9520J–AT42–05/2013