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
Freescale Semiconductor
Freescale Semiconductor
13
5.3
Filtered Data
Each electrode has an associated filtered output. This output is generated through register settings and a low pass filter
implementation (
implementation (
).
5.3.1
The Filtered Data Low register contains the data on each of the electrodes. It is paired with the Filtered Data High register for
reading the 10 bit A/D value. The address of the ELE0 Filtered Data Low register is 0x02. The address of the ELE1 Filtered Data
Low register is 0x04. The address of the ELE2 Filtered Data Low register is 0x06.
reading the 10 bit A/D value. The address of the ELE0 Filtered Data Low register is 0x02. The address of the ELE1 Filtered Data
Low register is 0x04. The address of the ELE2 Filtered Data Low register is 0x06.
Figure 18. Filtered Data Low Register
5.3.2
The Filtered Data High register contains the data on each of the electrodes. It is paired with the Filtered Data Low register for
reading the 10 bit A/D value. The address of the ELE0 Filtered Data High register is 0x03. The address of the ELE1 Filtered Data
High register is 0x05. The address of the ELE2 Filtered Data High register is 0x07.
reading the 10 bit A/D value. The address of the ELE0 Filtered Data High register is 0x03. The address of the ELE1 Filtered Data
High register is 0x05. The address of the ELE2 Filtered Data High register is 0x07.
Figure 19. Filtered Data High Register
7
6
5
4
3
2
1
0
R
FDLB
W
Reset:
0
0
0
0
0
0
0
0
= Unimplemented
Table 7. Filtered Data Low Register Field Descriptions
Field
Description
7:0
FDLB
Filtered Data Low Byte – The Filtered Data Low Byte displays the lower 8 bits of
the 10 bit filtered A/D reading.
00000000 Encoding 0
~
11111111 Encoding 255
the 10 bit filtered A/D reading.
00000000 Encoding 0
~
11111111 Encoding 255
7
6
5
4
3
2
1
0
R
0
0
0
0
0
0
FDHB
W
Reset:
0
0
0
0
0
0
0
0
= Unimplemented
Table 8. Filtered Data High Register Field Descriptions
Field
Description
7:0
FDHB
Filtered Data High Bits – The Filtered Data High Bits displays the higher 2 bits of
the 10 bit filtered A/D reading.
00 Encoding 0
~
11 Encoding 3
the 10 bit filtered A/D reading.
00 Encoding 0
~
11 Encoding 3