MPR121 datasheet(18/57 Pages) FREESCALE

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MPR121

Sensors

Freescale Semiconductor

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.

AUTO-CONFIG LSL REGISTER

Figure 14. AUTO-CONFIG LSL Register

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.

The last setting required to set up the auto-configuration system is the AUTO e Register.

AUTO-CONFIG CONTROL REGISTER

Figure 15. AUTO-CONFIG Control Register

Table 15. AUTO-CONFIG Target Level Register Field Descriptions

Field

Description

7:0

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

543210

LSL

Reset:

000000

= Unimplemented

Table 16. AUTO-CONFIG LSL Register Field Descriptions

Field

Description

7:0

LSL

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

543210

AFES

RETRY

BVA

ARE

ACE

Reset:

000000

= Unimplemented

Tet

arg

0.7

–

-------------------------- 256 0.9

⋅⋅

90% of USL

Tet

arg

0.7

–

-------------------------- 256 0.65

⋅⋅

65% of USL

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