Freescale Semiconductor Evaluation Board MPR031/2 for 2- or 3-pad touch sensor controllers DEMOMPR031 DEMOMPR031 データシート
製品コード
DEMOMPR031
MPR03X
Sensors
22
Freescale Semiconductor
8.4.2
The Noise Half Delta register is used to set the Noise Half Delta for the third level filter. The address of the Noise Half Delta
Register is 0x27.
Register is 0x27.
Figure 28. Noise Half Delta Register
8.4.3
The Noise Count Limit register is used to set the Noise Count Limit for the Third Level Filter. The address of the Noise Half Delta
Register is 0x28.
Register is 0x28.
Figure 29. Noise Count Limit Register
7
6
5
4
3
2
1
0
R
0
0
NHD
W
Reset:
0
0
0
0
0
0
0
0
= Unimplemented
Table 15. Noise Half Delta Register Field Descriptions
Field
Description
5:0
NHD
Noise Half Delta – The Noise Half Delta determines the incremental change when
non-noise drift is detected.
000000 DO NOT USE THIS CODE
000001 Encoding 1 – Sets the Noise Half Delta to 1
~
111111 Encoding 63 – Sets the Noise Half Delta to 63
non-noise drift is detected.
000000 DO NOT USE THIS CODE
000001 Encoding 1 – Sets the Noise Half Delta to 1
~
111111 Encoding 63 – Sets the Noise Half Delta to 63
7
6
5
4
3
2
1
0
R
0
0
0
0
NCL
W
Reset:
0
0
0
0
0
0
0
0
= Unimplemented
Table 16. Noise Count Limit Register Field Descriptions
Field
Description
3:0
NCL
Noise Count Limit – The Noise Count Limit determines the number of samples consecutively
greater than the Max Half Delta necessary before it can be determined that it is non-noise.
0000 Encoding 0 – Sets the Noise Count Limit to 1 (every time over Max Half Delta)
0001 Encoding 1 – Sets the Noise Count Limit to 2 consecutive samples over Max Half Delta
~
1111 Encoding 15 – Sets the Noise Count Limit to 15 consecutive samples over Max Half Delta
greater than the Max Half Delta necessary before it can be determined that it is non-noise.
0000 Encoding 0 – Sets the Noise Count Limit to 1 (every time over Max Half Delta)
0001 Encoding 1 – Sets the Noise Count Limit to 2 consecutive samples over Max Half Delta
~
1111 Encoding 15 – Sets the Noise Count Limit to 15 consecutive samples over Max Half Delta