AS3955 datasheet(39/111 Pages) AMSCO

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ams Datasheet

Page 39

[v1-01] 2015-Apr-29

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AS3955 − Detailed Description

Configuration Byte IC_CFG0

Figure 43:

Configuration Byte IC_CFG0

Note(s) and/or Footnote(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 44.

Figure 44:

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

1: RF has priority access to EEPROM over

SPI / I²C

i2c_addr3<2>

I²C slave address

i2c_addr2<1>

i2c_addr1<0>

slnt_vl<2:0>

Voltage Threshold

Abs. Accuracy

000b

1.42V

±15mV

001b

1.62V

Linearly

increasing over

range

010b

1.82V

011b

2.23V

100b

2.53V

101b

2.74V

110b

3.04V

111b

3.65V

±25mV

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