MPR121_10 FREESCALE [Freescale Semiconductor, Inc], MPR121_10 Datasheet - Page 27

• Manufacturer Part Number: MPR121_10
• Description: Proximity Capactive touch Senosr controller
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Sensors
Freescale Semiconductor
NOISE HALF DELTA (NHD)
NOISE COUNT LIMIT (NCL)
Table 24. Noise Count Limit Register Field Descriptions
Table 23. Noise Half Delta Register Field Descriptions
Field
NCL
7:0
Reset:
Reset:
Field
NHD
5:0
W
W
R
R
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.
00000000 Encoding 0 – Sets the Noise Count Limit to 1 (every time over Max Half Delta)
00000001 Encoding 1 – Sets the Noise Count Limit to 2 consecutive samples over Max Half Delta
~
11111111 Encoding 255 – Sets the Noise Count Limit to 255 consecutive samples over Max Half Delta
7
0
0
7
0
= Unimplemented
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
= Unimplemented
6
0
0
6
0
Figure 26. Noise Count Limit Register
Figure 25. Noise Half Delta Register
5
0
5
0
4
0
4
0
NCL
Description
Description
3
0
3
0
NHD
2
0
2
0
1
0
1
0
0
0
0
0
MPR121
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