MPR121 datasheet(35/57 Pages) FREESCALE

35 / 57 page

MPR121

Sensors

Freescale Semiconductor

TOUCH STATUS REGISTER 1

Figure 39. Touch Status Register1

FILTER DATA HIGH

Figure 40. Filtered Data High Register

543210

ROVCF

EPROXS

E11S

E10S

E9S

E8S

Reset:

000000

= Unimplemented

Table 27. Touch Status Register 1 Field Descriptions

Field

Description

OVCF

Over Current Flag – The Over Current Flag will be set any time the wrong value of

Rext is connected to the MPR121’s Rext pin. This is to protect the part from high

current that could result from an incorrect resistor value.

0 – Correct Rext resistor value

1 – Incorrect Rext resistor value

EPROXS

Electrode PROX Status – The Electrode PROX Status bit shows touched nor not

touched.

0 – Not Touched

1 – Touched

E11S

Electrode 11 Status – The Electrode 11 Status bit shows touched or not touched.

0 – Not Touched

1 – Touched

E10S

Electrode 10 Status – The Electrode 10 Status bit shows touched or not touched.

0 – Not Touched

1 – Touched

E9S

Electrode 9 Status – The Electrode 9 Status bit shows touched or not touched.

0 – Not Touched

1 – Touched

E8S

Electrode 8 Status – The Electrode 8 Status bit shows touched or not touched.

0 – Not Touched

1 – Touched

543210

0000

FDHB

Reset:

000000

= Unimplemented

Table 28. 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

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