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AN3433 датащи(PDF) 4 Page - STMicroelectronics

номер детали AN3433
подробное описание детали  Optimizing wakeup time and power consumption in CR95HF and STRFNFCA devices
PDF  34 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3433 датащи(HTML) 4 Page - STMicroelectronics

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Reference information
AN3433
4/34
Doc ID 019046 Rev 2
1
Reference information
1.1
Reference documents
CR95HF: 13.56 MHz Multi-protocol Contactless Transceiver IC with SPI and UART serial
access datasheet
STRFNFCA: Near field communication transceiver datasheet
1.2
Terms and acronyms
1.3
Notation conventions
The following symbols correspond to:
>>>: Frame sent by the host to CR95HF or STRFNFCA
<<<: Frame sent by the CR95HF or STRFNFCA to the host
Table 1.
List of terms and acronyms
Term
Meaning
AFE
Analog Front End
DAC
Digital-to-analog converter
DFT
Design for Test
NVM
Non Volatile Memory
RFID
Radio frequency identification
RFU
Reserved for Future Use
WFE
Wait For Event
Table 2.
List of characteristic values
Symbol
Definition
Value
CalRef
Tag Calibration Reference level and
DAC threshold level for device setup
DacDataH
High Level detection limit
DacDataL
Low Level detection limit
MaxSleep
Number of inactivity periods (tINACTIVE) before a timeout.
SwingCnt
Number of 13.56 MHz periods in the RF burst
tDAC
DAC set up time
tHFO
Period of RF carrier (13.56 MHz)
73 ns
tINACTIVE
Inactivity period, delay between two wakeups for RF burst
emissions in a Tag Detection sequence
tINACTIVE =
(WuPeriod+1)*tREF
tLFO
Period of device Low frequency oscillator (32 kHz)
31.25 µs



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