AS3953B
14443 High Speed Passive Tag
Interface
General Description
The AS3953B NFC interface IC (NFiC) delivers low cost, ultra low
power NFC forum functionality to multiple different
applications. The AS3953B is a analog front-end with integrated
14443A data framing and SPI interface. It is designed to create
a fast data link between an ISO 14443A reader device (PCD) and
a microcontroller. The AS3953B is
passively powered
meaning
that it can be supplied from the PCD magnetic field, eliminating
the need of a continual external supply. This makes the AS3953B
perfect for wireless communication to a low-power battery
powered device.
The AS3953B is used with an appropriate antenna coil
connected to the terminals LC1 and LC2, and behaves as a
normal passive ISO 144443A tag (PICC). After the anti-collision
protocol is passed, the PCD sends a
Wake-Up
command, which
wakes up the microcontroller by sending an interrupt. From this
point onwards, the AS3953B serves as a data link between the
microcontroller and the PCD. AS3953B can also operate as
NFCIP-1 target at 106kbit/s.
The AS3953B includes an onboard EEPROM that can be
accessed either from the PCD or from the microcontroller via
the SPI interface. This built-in flexibility makes it ideal for two
types of applications:
•
Where personalization data is programmed by the PCD
(even in case the SPI side is not powered) and it is later
read by microcontroller through SPI interface.
•
Where log data is stored periodically by the
microcontroller and can then be read by the PCD even
when the microcontroller is not powered.
A regulated power supply voltage extracted from the PCD field
is also available on a pin and can be used as power supply for
external circuitry. For example, an external microcontroller and
a sensor could be powered from the PCD field combined with
pass through data rates up to 848kbit/s, which means the
AS3953B is ideal for contactless passive programming of MCU
systems. The AS3953B can also operate as a stand-alone ISO
14443A tag.
The AS3953B supports ISO 14443A up to Level-4, meaning a
contactless smart card or an NFC forum compatible tag (Tag
Type 4) can be built. Having a NFC Forum compatible tag
interface allows the AS3953B to be used in an application where
a standard NFC enabled phone is used as a PCD.
Ordering Information
and
Content Guide
appear at end of
datasheet.
ams Datasheet
[v1-04] 2016-Jan-07
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AS3953B −
General Description
Key Benefits & Features
The benefits and features of AS3953B,14443 High Speed Passive
Tag Interface are listed below:
Figure 1:
Added Value of Using AS3953B
Benefits
•
NFC Forum compliance for full
interoperability
•
Data rate transmission up to the
maximum allowed by ISO 14443A
compliance
•
ECMA-340 / ISO/IEC_18092 compliance
•
Internal user memory for standalone
application
•
Allows zero-power standby
•
Enables long battery life time, or
battery-less designs
•
Allows supply of external circuitry
•
Easy and fast antenna design and
impedance matching
•
Guarantees no reset during reader (PCD)
modulation
•
Design flexibility, easy integration.
•
Fits requirements for various embedded
applications and manage of external
microcontroller
•
Fits supply requirements for various
applications, including industrial
•
Flexibility for wide range of applications
•
Small outline, compatibility to common
inlay and card manufacturing lines,
surface-mount assembly
Features
•
ISO 14443A compliant to Level-4
•
Bit rates from 106 kbit/s till 848 kbit/s
•
7 byte UID
•
NFCIP-1 target at 106 kbit/s
•
1k bit EEPROM (108 bytes of user memory)
•
Configurable wake-up interrupt (after tag is selected or
using proprietary command)
•
Powered from external magnetic field with the possibility to
draw up to 5mA
•
User configurable regulated voltage extracted from external
magnetic field
•
Integrated resonant capacitor
•
Integrated buffer capacitor
•
4-wire Serial Peripheral Interface (SPI) with 32 byte FIFO
•
Wide SPI power supply range (1.65V to 3.6V)
•
Wide temperature range: -40ºC to 85ºC
•
Available as sorted wafer and Thin Wafer Level Chip Scale
Package
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ams Datasheet
[v1-04] 2016-Jan-07
AS3953B −
General Description
Applications
The device is ideal for applications like
•
Passive wake-up
•
Multipurpose HF interface to a controller
•
Low power or passive programming
•
Ultra low power data logger
•
RFID programmable configuration EEPROM, ISO 14443A
smart card, NFC Forum tag type 4
•
Bluetooth and Wi-Fi pairing
Block Diagram
The functional blocks of this device are shown below:
Figure 2:
AS3953B Block Diagram
VP_REG
VP_INT
Power
Manager
VDD
LC1
AFE
LC2
POR
Logic
EEPROM
AS3953B
VP_SPI
IRQ
Level
Shifters
SPI
VSS
ams Datasheet
[v1-04] 2016-Jan-07
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AS3953B −
Pin Assignment
Pin Assignment
Figure 3:
Pin Assignment (Bottom View)
10
9
8
7
6
/SS
A1
IRQ
MOSI
A2
MOSI
MISO
SCLK
IRQ
/SS
AS3953B
MISO
A3
A4
SCLK
B1
VP_REG
B4
TEST
LC2
B2
LC1
B3
VP_REG
VP_SPI
0
VSS
VP_SPI
C4
LC1
LC2
1
2
3
4
Figure 4:
Pin Description
Pin Number
Pin Name
Sorted Die
0
1
2
3
4
5
6
7
8
9
10
-
TEST
VP_SPI
VP_REG
LC1
Analog I/O
LC2
VSS
/SS
SCLK
MOSI
MISO
IRQ
Exposed Pad
Digital output /
tristate
Digital output
Supply
Digital input
Supply pad
Ground, die substrate potential
Serial Peripheral Interface enable (active low)
Serial Peripheral Interface clock
Serial Peripheral Interface data input
Serial Peripheral Interface data output
Interrupt request output (active high)
Exposed pad to be connected to ground (optional)
Connection to tag coil
Internal use
Supply pad
Analog output
No connection
Positive supply of SPI interface
Regulator output
Pin Type
VSS
C1
AS3953B
WL-CSP
(Top view)
5
Description
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[v1-04] 2016-Jan-07
AS3953B −
Absolute Maximum Ratings
Absolute Maximum Ratings
Stresses beyond those listed in
Absolute Maximum Ratings
may
cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any
other conditions beyond those indicated in
Operating
Conditions
is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect device
reliability.
Figure 5:
Absolute Maximum Ratings
Symbol
Parameter
Min
Max
Units
Comments
Electrical Parameters
V
DD
V
IN
DC supply voltage
Input pin voltage except LC1
and LC2
Input pin voltage pins LC1 and
LC2
Peak current induced on pins
LC1 and LC2
I
scr
Input current
(latchup immunity)
-100
-0.5
-0.5
-0.5
5
5
6.5
100
100
V
V
V
mA
mA
Norm: Jedec 78
Electrostatic Discharge
ESD
HBM
Electrostatic discharge
(human body model)
±2
kV
Norm: MIL 883 E method
3015
Temperature Ranges and Storage Conditions
T
strg
RH
NC
MSL
t
strg_DOF
T
strg_DOF
Storage temperature
Relative humidity
non-condensing
Moisture sensitivity level
Storage time for DOF/dies or
wafers on foil
Storage temperature for
DOF/dies or wafers on foil
Relative humidity for DOF/dies
or wafers on foil in open
package
Relative humidity for DOF/dies
or wafers on foil in closed
package
40
18
-55
5
1
3
24
months
ºC
125
85
ºC
%
Maximum floor life time of
unlimited hours
Refer to indicated date of
packing
RH
open_DOF
15
%
Opened package
RH
Unopen_
DOF
60
%
Unopened package
ams Datasheet
[v1-04] 2016-Jan-07
Page 5
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