AS3955 datasheet(30/111 Pages) AMSCO

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[v1-01] 2015-Apr-29

AS3955 − Detailed Description

Fabrication Data FAB_CFG1

Figure 30:

Fabrication Data FAB_CFG1

Note(s) and/or Footnote(s):

1. This byte can be set only during production.

The fdel bits define frame delay time (FDT) adjustment and

represent a time compensation in number of clocks of carrier

frequency. The osct bits are trimming bits for the internal

oscillator.

Fabrication Data FAB_CFG2

Figure 31:

Fabrication Data FAB_CFG2

Note(s) and/or Footnote(s):

1. This byte can be set only during production.

Conf. Bit

Name

Default

Function

Note

fdel<3>

PCD to PICC frame delay time compensation;

frame compensation defined as fdel*1/fc

fdel<2>

fdel<1>

fdel<0>

osct<1>

Oscillator trimming bits

osct<0>

decc<1>

Decoder compensation register

decc<0>

Conf. Bit

Name

Default

Function

Note

test_mode

mod_r

1: decreased modulator switch resistance

miso_pd2

1: pull down on MISO, when \SS is low and

MISO is not driven by the AS3955

miso_pd1

1: pull down on MISO when \SS is high

rfu

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