AS3956 datasheet(31/107 Pages) AMSCO

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ams Datasheet

Page 31

[v1-11] 2018-Nov-14

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AS3956 − Detailed Description

Fabrication Data FAB_CFG1

Figure 28:

Fabrication Data FAB_CFG1

Note(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 29:

Fabrication Data FAB_CFG2

Note(s):

1. This byte can be set only during the production in a chip test mode.

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

0: Test mode is disabled

mod_r

1: The modulator switch resistance is decreased

i2c_pu

1: Enable pull-ups for SDA and SCL when I²C is used

miso_pd1

1: Pull down on MISO when \SS is high

Do not change from default

rfu

Reserved for future use

rfu

Reserved for future use

rfu

Reserved for future use

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