AT42QT1481_14 Datasheet, PDF (37/73 Pages) ATMEL Corporation – 48-Key QMatrix FMEA IEC/EN60730 Touch Sensor IC

Table 4-5. Command Summary (Continued)
Hex Name
Description
#/Cmd
0x16
Sleep
Enter sleep at end of each matrix scan
if no activity and if sleep is also
1
enabled in Setups
Get signal, ref, Norm DI for key k {0 –
47}
0x4k
Data for 1 key
1
Signal: 2 bytes; Ref: 2 bytes; Norm DI:
1 byte
0x8k
Status for key k Get status byte for key k {0 – 47}
1
Force calibration of key k where k =
0 – 47. Command must be repeated
0xCk
CAL key k
twice consecutively without any
2
intervening command in 110 ms to
execute
# Rtnd Rtn Range
1
0xE9
CRC
–
Description
Page
Returns 1's complement of command to
acknowledge; wakes on INT to scan matrix before
returning to sleep. Sleep disabled on receipt of any
31
other valid command.
0 – 0xFF
Signal and ref are Tx as 2 bytes, LSByte first.
7
16 16-bit CRC (of command + return data) is
31
Each byte
appended to return
Bits 7 – 5: reserved
Bit 4: 1 = FMEA KGTT test failed on this key
Bit 3: 1 = key is in detect
3
0 – 0xFF
16 ^{Bit 2: 1 = (Ref < LSL)}
32
Bit 1: 1 = key is in calibration
Bit 0: 1 = calibration of this key failed
16-bit CRC (of command + return data) is
appended to return
Used in Run mode. Normal sensing of other keys
not affected. CAL of k only takes place in the key’s
1
0x10 – 0x3F
– ^{normal timeslot.}
32
Returns the ones complement of the command
char, once the calibration is scheduled.