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ST25R3911B датащи(PDF) 11 Page - STMicroelectronics

номер детали ST25R3911B
подробное описание детали  Automatic antenna tuning system providing tuning of antenna LC tank
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST25R3911B датащи(HTML) 11 Page - STMicroelectronics

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ST25R3911B
Functional overview
71
1.1.1
Transmitter
The transmitter incorporates drivers that drive external antenna through pins RFO1 and
RFO2. Single sided and differential driving is possible. The transmitter block additionally
contains a sub-block that modulates transmitted signal (OOK or configurable AM
modulation).
The ST25R3911B transmitter is intended to directly drive antennas (without 50 Ω cable,
usually antenna is on the same PCB). Operation with 50 Ω cable is also possible, but in that
case some of the advanced features are not available.
1.1.2
Receiver
The receiver detects transponder modulation superimposed on the 13.56 MHz carrier
signal. The receiver contains two receive chains (one for AM and another for PM
demodulation) composed of a peak detector followed by two gain and filtering stages and a
final digitizer stage. The filter characteristics are adjusted to optimize performance for each
mode and bit rate (sub-carrier frequencies from 212 kHz to 6.8 MHz are supported). The
receiver chain inputs are the RFI1 and RFI2 pins. The receiver chain incorporates several
features that enable reliable operation in challenging phase and noise conditions.
1.1.3
Phase and amplitude detector
The phase detector is observing the phase difference between the transmitter output signals
(RFO1 and RFO2) and the receiver input signals (RFI1 and RFI2). The amplitude detector is
observing the amplitude of the receiver input signals (RFI1 and RFI2) via self-mixing. The
amplitude of the receiver input signals (RFI1 and RFI2) is directly proportional to the
amplitude of the antenna LC tank signal.
The phase detector and the amplitude detector can be used for the following purposes:
PM demodulation by observing RFI1 and RFI2 phase variation
Average phase difference between RFOx pins and RFIx pins is used to check and
optimize antenna tuning
Amplitude of signal present on RFI1 and RFI2 pins is used to check and optimize
antenna tuning
1.1.4
A/D converter
The ST25R3911B contains a built in Analog to Digital (A/D) converter. Its input can be
multiplexed from different sources and is used in several applications (measurement of RF
amplitude and phase, calibration of modulation depth…). The result of the A/D conversion is
stored in the A/D Converter Output Register and can be read via SPI.
1.1.5
Capacitive sensor
The capacitive sensor is used to implement low power detection of transponder presence, it
measures the capacitance between two copper patches connected to the CSI and CSO
pins. The capacitance changes with the presence of an object (card, hand). During
calibration the reference capacitance (representing parasitic capacitance of the
environment) is stored. In normal operation the capacitance is periodically measured and
compared to the stored reference value, if the measured capacitance differs from the stored
reference value by more than a register defined threshold, then an interrupt is sent to the
external controller.


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