MPR121_10 FREESCALE [Freescale Semiconductor, Inc], MPR121_10 Datasheet - Page 17

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

Sensors
Freescale Semiconductor
AUTO-CONFIG USL REGISTER
AUTO-CONFIG TARGET LEVEL REGISTER
As this register represents the upper limit for the auto-configuration the value can be calculated by:
For the 1.8 V system, this value is 156 or 0x9C.
Table 14. AUTO-CONFIG USL Register Field Descriptions
Reset:
Reset:
Field
USL
7:0
W
W
R
R
7
0
7
0
= Unimplemented
= Unimplemented
Upper Limit – The Upper Limit for the auto-configuration baseline search is set to
this value.
00000000 – Upper Limit set to 0
00000001 – Upper Limit set to 1
~
11111111 – Upper Limit set to 255
Figure 13. AUTO-CONFIG Target Level Register
6
0
6
0
Figure 12. AUTO-CONFIG USL Register
VSL
=
5
0
5
0
V DD 0.7
------------------------- - 256
V
DD
–
4
0
4
0
⋅
USL
T_L
Description
3
0
3
0
2
0
2
0
1
0
1
0
0
0
0
0
Equation 8
MPR121
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