AS3909/AS3910
13.56 MHz RFID Reader IC,
ISO-14443 A/B
General Description
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
Figure 1:
Standard Products
Part Number
AS3909
AS3910
AAT
No
Yes
NC
Trim Pins
Connect to external trim caps as mentioned in
Calibrate Antenna
Resonance
Key Benefits & Features
The benefits and features of this device are listed below:
Figure 2:
Added Value of Using AS3909/10
Benefits
Stable Modulation Index
Enabling Ultra Low Power Applications
No communication holes
Measuring signal strength on RFI pins
Features
Close loop adjustment of ASK modulation for accurate control
of modulation depth in case of ISO-14443B protocol
Low power (3.5μA) NFC target mode
AM/PM demodulator
Accurate RF envelope measurement (8 bit A/D)
High output power at 3.3V power supply:
• Up to 700mW in case regulator is externally shorted
• Up to 500mW in case differential output and antenna
trimming is used
• Up to 125mW in case of single ended output and antenna
trimming is used
Squelch feature which performs gain reduction to compensate
for noise generated by transponder processing
Automatic Antenna tuning (AAT)
(1)
Transparent mode
Amplitude and phase measurement
Supporting 13.56 MHz and 27.12MHz Quartz oscillator with fast
start-up
Supply voltage range from 2.4V to 3.6V
Wide temperature range: -40ºC to 85ºC
32-pin QFN (5x5mm) for AS3910 and 32-pin TQFN (5x5mm) for
AS3909
Enables various antenna configurations
Increases EMD immunity
Enable tuning of the Antenna LC Tank
For support of other standards and custom
protocols (ISO-15693, FeliCa, ...)
Enabling Inductive wakeup in combination
with MCU
Note(s) and/or Footnote(s):
1. Only available in AS3910.
AS3909/AS3910 – 2
ams Datasheet, Confidential: 2013-Oct [3-02]
General Description
Applications
The AS3909/10 is ideal for applications where the reader
antenna is directly driven (no 50Ω cable). It also includes several
unique features, which make it especially suitable for low power
and battery powered applications.
Block Diagram
The functional blocks of this device for reference are
shown below:
Figure 3:
AS3909/10 HF RFID Reader IC Block Diagram
XTO
XTI
Oscillator
Regulators
Bias
Logic
FIFO
FIFO
Transmitter
RFO1
RFO2
Control Logic
SPI
SPI Interface
A/D Converter
Phase &
Amplitude
Detector
Framing
Receiver
RFI1
RFI2
External Field
Detector
AS3909/10 HF RFID Reader IC Block Diagram
Note:
The main differences between AS3909 and AS3910 are elaborated in sections
General Description, Pin Assignments, Detailed
Description, Direct Commands, Clear
and
Active Receive – Use in ISO-14443B Anticollision.
ams Datasheet, Confidential: 2013-Oct [3-02]
AS3909/AS3910 – 3
Pin Assignments
Pin Assignments
Figure 4:
Pin Assignments (Top View)
The AS3909/10 pin assignments are described below.
MCU_CLK
MCU_CLK
SDATAO
SDATAO
SDATAI
SDATAI
VSN_A
VSN_A
26
AD_IN
32
31
30
29
28
27
26
25
24
23
22
32
31
30
29
28
27
TIO
EN
TEST
XTO
XTI
VSN_D
VSP_A
VDD
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
AGD
RFI2
RFI1
VSS
NC
NC
NC
NC
TIO
EN
TEST
XTO
XTI
VSN_D
VSP_A
VDD
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
AD_IN
25
24
23
22
SCLK
SCLK
INTR
INTR
SEN
SEN
AGD
RFI2
RFI1
VSS
TRIM2_0
TRIM1_0
TRIM2_1
TRIM1_1
AS3909
21
20
19
18
17
AS3910
21
20
19
18
17
VSN_RF
VSN_RF
VSP_RF
VSP_RF
TRIM1_3
TRIM2_3
TRIM1_2
Figure 5:
Pin Description
Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
Pin Name
TIO
EN
TEST
XTO
XTI
VSN_D
VSP_A
VDD
VSP_RF
RFO1
Pin Type
Digital bi-directional
Digital input with
pull-down
Analog output
Analog input
Supply
Analog Input /
Output
Supply
Analog Input /
Output
Analog output
Test IO pin
Enable input
Test input
Description
Xtal oscillator output
Xtal oscillator input
Digital ground
Analog supply, regulator output
External positive supply
Supply, regulator output for antenna drivers
Antenna driver output
Ground of antenna drivers
RFO2
VSN_RF
Supply
AS3909/AS3910 – 4
ams Datasheet, Confidential: 2013-Oct [3-02]
TRIM2_2
RFO1
RFO2
RFO1
RFO2
NC
NC
NC
NC
Pi n A s s i g n m e n t s
Pin Number
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
Exposed Pad
Pin Name
NC/TRIM1_3
NC/TRIM2_3
NC/TRIM1_2
NC/TRIM2_2
Pin Type
Description
Analog input
NC/TRIM1_1
NC/TRIM2_1
NC/TRIM1_0
NC/TRIM2_0
VSS
RFI1
Analog input
RFI2
AGD
AD_IN
VSN_A
INTR
Digital output
MCU_CLK
SDATAO
SDATAI
SCLK
SEN
VSUB
Supply
Digital input
Digital Output /
Tristate
Analog Input /
Output
Analog input
Supply pad
Supply pad
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
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