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MPR121 数据表(PDF) 53 Page - Freescale Semiconductor, Inc

部件名 MPR121
功能描述  Proximity Capactive touch Senosr controller
PDF  57 Pages
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制造商  FREESCALE [Freescale Semiconductor, Inc]
网页  http://www.freescale.com
标志 FREESCALE - Freescale Semiconductor, Inc

MPR121 数据表(HTML) 53 Page - Freescale Semiconductor, Inc

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MPR121
Sensors
Freescale Semiconductor
53
Section E
Section F
CONCLUSION
In many applications for the MPR121, the default settings presented in this document will be sufficient for both design time
activities as well as in the production implementation.
Register Address
Register Name
Value
Application Note
0x5E
Electrode Configuration
0x0C
AN3890
Description: This register controls the number of electrodes being enabled and the mode the device is in. There
are only two modes, Standby (when the value is 0x00) and Run (when the value of the lower bit is
non-zero). The default value shown enables all 12 electrodes by writing decimal 12 or hex 0x0C to
the register. Typically other registers cannot be changed while the part is running so this register
should always be written last.
Variation: During debug of a system, this register will change between the number of electrodes and 0x00
every time a register needs to change. In a production system, this register will only need to be
written when the mode is changed from Standby to Run or vise versa.
Register Address
Register Name
Value
Application Note
0x7B
AUTO-CONFIG Control Register 0
0x0B
AN3889
0x7D
AUTO-CONFIG USL Register
0x9C
AN3889
0x7E
AUTO-CONFIG LSL Register
0x65
AN3889
0x7F
AUTO-CONFIG Target Level Register
0x8C
AN3889
Description: These are the settings used for the Auto Configuration. They enable AUTO-CONFIG and
AUTO_RECONFIG. In addition they set the target range for the baseline. The upper limit is set to
190, the target is set to 180 and the lower limit is set to 140.
Variation: In most cases these values will never need to be change, but if a case arises, a full description is
found in application note AN3889.



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