AS3956 datasheet(40/107 Pages) AMSCO

номер детали	AS3956

подробное описание детали	NFC Forum Compliant Dynamic Tag

PDF	107 Pages

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производитель	AMSCO [ams AG]

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Page 40

ams Datasheet

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[v1-11] 2018-Nov-14

AS3956 − Detailed Description

Configuration Byte IC_CFG0

Figure 40:

Configuration Byte IC_CFG0

Note(s):

1. This byte can always be accessed for read and write via SPI / I²C and can be accessed for read and write from the RF side if rfcfg_en

is set to 1. Bit arbit_mod can be modified after initialization over SPI / I²C.

Bit slnt_mod enables Silent mode. In this mode, the supply pin

VP_IO is being observed. If voltage is below the level defined

in slnt_vl<2:0>, then Silent mode is activated. This means that

RF part of the IC is turned off and stops being responsive to

incoming RF commands.

Voltage threshold settings on VP_IO are shown in Figure 41.

Figure 41:

Silent Mode Threshold Voltage Levels

Conf. Bit

Name

Default

Function

Note

slnt_mod

1: Enable silent mode

slnt_vl<2>

Silent mode voltage level (see Silent Mode)

slnt_vl<1>

slnt_vl<0>

arbit_mod

i2c_addr3<2>

I²C slave address

i2c_addr2<1>

i2c_addr1<0>

slnt_vl<2:0>

Typ. Voltage Threshold

[V]

000b

1.42

001b

1.62

010b

1.82

011b

2.23

100b

2.53

101b

2.74

110b

3.04

111b

3.65

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