MPR121_10 FREESCALE [Freescale Semiconductor, Inc], MPR121_10 Datasheet - Page 18

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

MPR121
18
AUTO-CONFIG LSL REGISTER
The last setting required to set up the auto-configuration system is the AUTO e Register.
AUTO-CONFIG CONTROL REGISTER
This register represents the target level for the auto-configuration. The value can be calculated by:
For a 1.8 V system, this value is 140 or 0x8C.
This register represents the lower limit for the auto-configuration. The value can be calculated by:
For a 1.8 V system, this value is 101 or 0x65.
Table 16. AUTO-CONFIG LSL Register Field Descriptions
Table 15. AUTO-CONFIG Target Level Register Field Descriptions
Field
LSL
Reset:
Reset:
7:0
Field
7:0
TL
W
W
R
R
7
0
7
0
T
AFES
Lower Limit – The Lower Limit for the auto-configuration baseline search is set to this value.
00000000 – Lower Limit set to 0
00000001 – Lower Limit set to 1
~
11111111 – Lower Limit set to 255
T
arg
arg
= Unimplemented
= Unimplemented
Target Level – The Target Level for the auto-configuration baseline search is set to
this value.
00000000 – Target Level set to 0
00000001 – Target Level set to 1
~
11111111 – Target Level set to 255
et
et
=
6
0
6
0
Figure 15. AUTO-CONFIG Control Register
=
Figure 14. AUTO-CONFIG LSL Register
V
------------------------- - 256 0.65
V DD 0.7
------------------------- - 256 0.9
DD
V
V
DD
DD
–
–
0.7
5
0
5
0
⋅
RETRY
⋅
⋅
⋅
4
0
4
0
LSL
Description
Description
3
0
3
0
BVA
90% of USL
65% of USL
2
0
2
0
ARE
1
0
1
0
Freescale Semiconductor
ACE
0
0
0
0
Sensors