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AS3956 Datasheet(PDF) 13 Page - ams AG

Part # AS3956
Description  NFC Forum Compliant Dynamic Tag
PDF  107 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS3956 Datasheet(HTML) 13 Page - ams AG

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ams Datasheet
Page 13
[v1-11] 2018-Nov-14
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AS3956 − Detailed Description
Analog Frontend (AFE)
The AFE is connected to external tag coil, which together with
the integrated resonant capacitor forms an LC tank resonating
at the external electromagnetic field frequency (13.56 MHz).
Figure 12 depicts the main AFE building blocks.
Figure 12:
PICC AFE Block Diagram
Rectifier extracts DC power supply from the AC voltage
induced on coil terminals.
Limiter limits the maximum voltage on coil terminals to protect
AFE from destruction. At voltages that exceed limiter voltage it
starts to absorb current (acts as some sort of shunt regulator).
Modulator Switch is used for communication the NFC tag to a
NFC device. When switched on it will draw current from coil
terminals. This mechanism is called load modulation. Variation
of current in the modulator switch (ON and OFF state) is seen
as modulation by the NFC device.
Detailed Description
HF
PON
RECTIFIER
MODULATOR
SWITCH
LIMITER
DEMODULATOR
CLOCK
EXTRACTOR
LC1
LC2
NFC Type 2
Tag Logic
EXTERNAL
REGULATOR
BIAS
VP_REG
INTERNAL
REGULATOR
VP_INT
VREC



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