Datasheet

36
9502A–AT42–07/08
AT42QT2160
8. Setups Block
Setups data is sent from the host to the QT2160 using the I
2
C-compatible interface. The setups block is memory mapped
onto this interface. Thus each setup can be accessed by reading/writing the appropriate address. Setups can be accessed
individually or as a block.
Table 8-1. Setups Table
Address Bytes Parameter Symbol
Valid
Range Bits
Key
Scope
Default
Value Description Page
12 1 LP Mode LP_MODE 0 - 255 8 16 1
0: SLEEP mode (no capacitive
sensing)
1- 255: Low Power mode,
increments in steps of 16ms
27
13 1 Burst Repetition BREP 1...63 6 16 1 Range is 1...63 burst repetitions 27
15 1 Neg Drift Comp NDRIFT 0...127 7 16 20
Range is in 0.16s increments, 1 =
0.16s/reference level
28
16 1 Pos Drift Comp PDRIFT 0...127 7 16 5
Range is in 0.16s increments, 1 =
0.16s/reference level
28
17 1 Normal DI Limit NDIL 1...31 5 16 3
Normal DI limit: take the operand
and add 2 to get the value
29
18 1 Neg recal delay NRD 0...255 8 16
255
(40.8s)
Range is in 0.16s increments; 0 =
infinite; default = 40.8s
Range is {infinite, 0.16...40.8s}
29
19 1
Drift Hold
Time/Awake
Timeout
DHT/AWAKE 2...255 8 16 25 (4s)
Range in 0.2s increments; default
= 4s
30
20 1 Slider Control
HYST 0...15 4 Slider
0 (1
position)
0...8: hysteresis for slider’s
reported position
31
NUM_KEYS 0, 2...8 4 Slider 5 (5 keys)
0: disables slider mode
2...8: number of keys in slider
Slider Keys start at X0 and are on
Y0
21 1 Slider Options
RESOLUTIO
N
0...6 3 Slider 25 (4s)
Resolution of reported slider touch
position
8 bits (0) to 2 bits (6)
31
22...37 16 Key Control KEY_CONT 0...3 3 1 0 (AKS off)
0: AKS disabled
1...3: AKS groups
32
38...53 16 Neg threshold NTHR 1...255 8 1 10 32
54...69 16 Burst Length BL 0...255 8 1
4 (16
pulses)
0: Key disabled
1...255: Burst length = BL x 4
32