AT42QT1111-AU_14 Datasheet, PDF (25/50 Pages) ATMEL Corporation – 11-key QTouch Touch Sensor IC

6.7 Error Keys (0xC5)
This command returns a 2-byte bit-field report indicating the error status of all 11 keys. Note that disabled keys do
not report errors.
Table 6-5. 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 status good, 1 = key n in error (where n is 0–10).
6.8 Signal for Key k (0x2k)
This command returns a 2-byte report containing the most recent measured signal for key k. The signal is returned
as a 16-bit number, MSB first.
Table 6-6. Signal for Key k Report Format
Byte 0
Byte 1
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Signal MSB
Signal LSB
Bit 2
Bit 1
Bit 0
6.9 Reference for Key k (0x4k)
This command returns a 2-byte report containing the reference signal for key k. The reference is returned as a 16-bit
number, MSB first.
Table 6-7. Reference for Key k Report Format
Byte 0
Byte 1
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Reference MSB
Reference LSB
Bit 2
Bit 1
Bit 0
6.10 Status for Key k (0x8k)
This command returns a 1-byte report containing the status for key k.
Table 6-8. Status for Key k Report Format
Byte 0
Bit 7
DETECT
Bit 6
LBL
Bit 5
MBL
Bit 4
Bit 3
Bit 2
AKS_EN
Bit 1
CAL
Bit 0
KEY_EN
DETECT: 0ut of detect, 1 = in detect.
LBL: 0 = lower burst limit is good, 1 = lower burst limit has error.
MBL: 0 = maximum burst limit is good, 1 = maximum burst limit has error. The maximum burst limit is fixed at 2048
pulses.
AT42QT1111-MU / AT42QT1111-AU [DATASHEET]
25
9571C–AT42–05/2013