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AS3955 Scheda tecnica(PDF) 26 Page - ams AG

Il numero della parte AS3955
Spiegazioni elettronici  NFC Forum Compliant Dynamic Tag
PDF  102 Pages
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Produttore elettronici  AMSCO [ams AG]
Homepage  http://www.ams.com
Logo AMSCO - ams AG

AS3955 Scheda tecnica(HTML) 26 Page - ams AG

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[v1-04] 2016-Feb-03
AS3955 − Detailed Description
ACK Response
The ACK response of AS3955 is a 4-bit value Ah.
NACK Response
The AS3955 uses all four combinations of NAK values. The usage
of various NAK values is explained in section Error Handling.
Access to UID, SENS_RES and SEL_REQ During
Anti-Collision
UID block, SENSR1, SENSR2 and SELR bytes are stored in a buffer.
The purpose of storing these data into the buffer is faster access
to the data and UID verification during the anti-collision
procedure. Buffer access over SPI / I²C is locked until NFC tag
enters SELECTED state.
Get Version Command
In addition to standard NFC tag commands, AS3955 supports a
custom Get Version command. This command consists of 8 bits
and shall be transmitted only in standalone and Extended mode
when the tag is SELECTED state. The command code and the
tag response are shown resp. in Figure 24 and Figure 25.
Figure 24:
Coding of Get Version Command
b8
b7
b6
b5
b4
b3
b2
b1
011000
0
0



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