ST25R3911B datasheet(93/116 Pages) STMICROELECTRONICS

93 / 116 page

1.3.58

Capacitance measurement configuration register

Address: 3Ah

Type: RW

Table 89. Capacitance measurement configuration register

Bit

Name

Default

Function

Comments(1)

cm_d3

Definition of Δcm (difference to reference that triggers

interrupt)

cm_d2

cm_d1

cm_d0

cm_aam

0: Exclude the IRQ measurement

1: Include the IRQ measurement

Include/exclude the measurement that

causes IRQ (having difference > Δcm to

reference) in auto-averaging

cm_aew1

00: 4

01: 8

10: 16

11: 32

Define weight of last measurement

result for auto-averaging

cm_aew0

cm_ae

0: Use Capacitance measurement reference register

1: Use capacitance measurement auto-averaging as

reference

Select reference value for capacitance

measurement Wake-Up mode

1. Default setting takes place at power-up and after set default command.

1.3.59

Capacitance measurement reference register

Address: 3Bh

Type: RW

Table 90. Capacitance measurement reference register

Bit

Name

Default

Function

Comments(1)

cm_ref7

cm_ref6

cm_ref5

cm_ref4

cm_ref3

cm_ref2

cm_ref1

cm_ref0

1. Default setting takes place at power-up and after set default command

ST25R3911B

Registers

DS11793 - Rev 6

page 93/116

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