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PDF AS3909 Data sheet ( Hoja de datos )
| Número de pieza | AS3909 | |
| Descripción | 13.56 MHz RFID Reader IC | |
| Fabricantes | ams | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AS3909 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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General Description
AS3909/AS3910
13.56 MHz RFID Reader IC,
ISO-14443 A/B
The AS3909/10 is a high performance 13.56MHz HF RFID Reader
IC.
The AS3909/10 is unequalled in the domain of HF Reader ICs; it
contains two differential low impedance (1.5Ω) antenna
drivers.
These drivers are unmatched, which means that the IC can
deliver up to 8 times the output power of a standard HF Reader
IC using the same power supply voltage.
Additionally using this configuration means half of the power
consumption at the same output power.
The IC has an operating voltage down to 2.4V and a low power
operating mode of 5mA. This means the AS3909/10 is ideal for
portable or battery powered applications.
For applications where high power is required the AS3909/10
can attain up to 700mW. This means there is no need for
complex external booster circuitry.
The component count and complexity of the design is further
reduced through the patented automatic modulation depth
adjustment.
The analog front end (AFE) is complemented by a highly
integrated data framing engine for both ISO-14443 A and B.
This includes data rates up to 848kbits with all framing and
synchronization tasks on board. This enables the customer to
build a complete HF RFID Reader using only a low end micro.
The AS3909/10 not only supports reader to tag communication,
but sports Peer to Peer communication using the NFCIP-1 active
communication mode with a data rate of 106kbps.
The IC has a SPI, which enables bi-directional communication
with the external microcontroller.
Other standard and custom protocols, such as ISO -15693 or
Felica can be implemented via transparent mode.
Only available in AS3910: In addition to the above mentioned
advantages, AS3910 also features the ams' unique Automatic
Antenna Tuning (AAT)1 technology. With AAT, the device is
optimized for application with directly driven antenna and
enables the reader to retune itself to deliver maximum output
at 13.56MHz, when the surroundings detunes the antenna.
For further understanding in regards to the contents of the
datasheet, please refer to the Reference Guide located at the end
of the document.
1. Only available in AS3910.
ams Datasheet, Confidential: 2013-Oct [3-02]
AS3909/AS3910 – 1
1 page  
Pin Assignments
Pin Number Pin Name
Pin Type
13 NC/TRIM1_3
14 NC/TRIM2_3
15 NC/TRIM1_2
16 NC/TRIM2_2
Analog input
17 NC/TRIM1_1
18 NC/TRIM2_1
19 NC/TRIM1_0
20 NC/TRIM2_0
21 VSS Supply pad
22 RFI1
Analog input
23 RFI2
24
AGD
Analog Input /
Output
25
AD_IN
Analog input
26
VSN_A
Supply pad
27 INTR
Digital output
28 MCU_CLK
29
SDATAO
Digital Output /
Tristate
30 SDATAI
31
SCLK
Digital input
32 SEN
Exposed Pad
VSUB
Supply
Description
AS3909: NC
AS3910: Input to trim antenna resonant circuit
Ground, die substrate potential
Receiver input
Analog reference voltage
A/D converter input
Analog ground
Interrupt request output
Microcontroller clock output
Serial Peripheral Interface DATA output
Serial Peripheral Interface DATA input
Serial Peripheral Interface Clock
Serial Peripheral Interface Enable
Die substrate potential, to be connected to VSS on
PCB
ams Datasheet, Confidential: 2013-Oct [3-02]
AS3909/AS3910 – 5
5 Page 
Detailed Description
Transmitter
The Transmitter incorporates drivers, which drive external
antenna through pads RFO1 and RFO2. Single sided and
differential driving is possible. The transmitter block
additionally contains a subblock, which modulates transmitted
signal for communication reader to transponder (OOK or
configurable AM modulation).
The AS3909/10 transmitter is indented to directly drive
antennas (without 50Ω cable, usually antenna is on the same
PCB). Operation with 50Ω cable is also possible, but in that case
some of the advanced features are not possible.
Receiver
The receiver detects transponder modulation superimposed on
the 13.56MHz carrier signal. The receiver chain is composed of
a peak detector followed by two stages with gain and filtering
function and a final digitizer stage. The filter characteristics are
adjusted to optimize performance over different ISO modes and
data rates (subcarrier frequencies from 212 kHz to 848 kHz are
supported). The receiver chain input is the RFI1 pin; output of
digitizer stage is demodulated subcarrier signal. Receiver also
contains a subblock, which helps to detect the presence of
external RF field in NFCIP target mode. The receiver chain
incorporates several features, which enable reliable operation
in challenging phase and noise conditions.
Phase and Amplitude Detector
The phase detector observes the phase difference between the
transmitter output signals (RFO1 and RFO2) and the pad signals
RFI1 and RFI2. The pad signals RFI1 and RFI2 are proportional
to the signal on the antenna LC tank. RFI1 and RFI2 signals are
also used to run the self-mixer, which generates output
proportional to their amplitude. The phase detector and self
mixer blocks are used for several purposes:
• Variation of RFI1 and RFI2 phase is used to perform PM
demodulation
• Average phase difference between RFOx pins and RFIx
pins is used to check antenna tuning and inductive
wake-up via MCU
• Output of mixer is used to measure amplitude of signal
present on pins RFI1 and RFI2
A/D Converter
The AS3909/10 contains a built-in A/D Converter. Its input can
be multiplexed from different sources and is used in several
applications (measurement of RF amplitude, calibration of
modulation depth, checking of the antenna LC tank resonance,
ams Datasheet, Confidential: 2013-Oct [3-02]
AS3909/AS3910 – 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AS3909.PDF ] | |
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