MPR121 datasheet(53/57 Pages) FREESCALE

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MPR121

Sensors

Freescale Semiconductor

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.

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.

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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