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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
Page 1
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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
Features
• NFC Forum compliance for full
interoperability
• ISO 14443A compliant to Level-4
• Data rate transmission up to the
maximum allowed by ISO 14443A
compliance
• Bit rates from 106 kbit/s till 848 kbit/s
• 7 byte UID
• ECMA-340 / ISO/IEC_18092 compliance
• NFCIP-1 target at 106 kbit/s
• Internal user memory for standalone
application
• 1k bit EEPROM (108 bytes of user memory)
• Allows zero-power standby
• Configurable wake-up interrupt (after tag is selected or
using proprietary command)
• Enables long battery life time, or
battery-less designs
• Powered from external magnetic field with the possibility to
draw up to 5mA
• Allows supply of external circuitry
• User configurable regulated voltage extracted from external
magnetic field
• Easy and fast antenna design and
impedance matching
• Integrated resonant capacitor
• Guarantees no reset during reader (PCD)
modulation
• Integrated buffer capacitor
• Design flexibility, easy integration.
• Fits requirements for various embedded
applications and manage of external
microcontroller
• 4-wire Serial Peripheral Interface (SPI) with 32 byte FIFO
• Fits supply requirements for various
applications, including industrial
• Wide SPI power supply range (1.65V to 3.6V)
• Flexibility for wide range of applications
• Wide temperature range: -40ºC to 85ºC
• Small outline, compatibility to common
inlay and card manufacturing lines,
surface-mount assembly
• Available as sorted wafer and Thin Wafer Level Chip Scale
Package
Page 2
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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
AS3953B
Power
Manager
VP_SPI
VDD
LC1
IRQ
AFE
LC2
ams Datasheet
[v1-04] 2016-Jan-07
Logic
POR
EEPROM
Level
Shifters
SPI
VSS
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AS3953B − Pin Assignment
Pin Assignment
9
8
7
6
MISO
MOSI
SCLK
/SS
/SS
A1
AS3953B
SCLK
2
3
4
C1
VSS
1
LC2
VSS
LC1
0
VP_REG
B1
VP_SPI
TEST
10
IRQ
Figure 3:
Pin Assignment (Bottom View)
IRQ
MOSI
MISO
A2
A3
LC2
LC1
B2
B3
AS3953B
WL-CSP
(Top view)
A4
VP_REG
B4
VP_SPI
C4
5
Figure 4:
Pin Description
Pin Number
Pin Name
Pin Type
Description
0
TEST
Internal use
No connection
1
VP_SPI
Supply pad
Positive supply of SPI interface
2
VP_REG
Analog output
3
LC1
4
LC2
5
VSS
6
/SS
7
SCLK
8
MOSI
9
MISO
Digital output /
tristate
Serial Peripheral Interface data output
10
IRQ
Digital output
Interrupt request output (active high)
-
Exposed Pad
Supply
Sorted Die
Page 4
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Regulator output
Analog I/O
Connection to tag coil
Supply pad
Ground, die substrate potential
Serial Peripheral Interface enable (active low)
Digital input
Serial Peripheral Interface clock
Serial Peripheral Interface data input
Exposed pad to be connected to ground (optional)
ams Datasheet
[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
VDD
DC supply voltage
-0.5
5
V
VIN
Input pin voltage except LC1
and LC2
-0.5
5
V
Input pin voltage pins LC1 and
LC2
-0.5
6.5
V
100
mA
100
mA
Norm: Jedec 78
kV
Norm: MIL 883 E method
3015
Peak current induced on pins
LC1 and LC2
Iscr
Input current
(latchup immunity)
-100
Electrostatic Discharge
Electrostatic discharge
(human body model)
ESDHBM
±2
Temperature Ranges and Storage Conditions
Tstrg
Storage temperature
RHNC
Relative humidity
non-condensing
MSL
Moisture sensitivity level
1
tstrg_DOF
Storage time for DOF/dies or
wafers on foil
3
Tstrg_DOF
Storage temperature for
DOF/dies or wafers on foil
RHopen_DOF
Relative humidity for DOF/dies
or wafers on foil in open
package
RHUnopen_
Relative humidity for DOF/dies
or wafers on foil in closed
package
DOF
ams Datasheet
[v1-04] 2016-Jan-07
-55
125
ºC
5
85
%
18
40
Maximum floor life time of
unlimited hours
months
Refer to indicated date of
packing
24
ºC
15
%
Opened package
60
%
Unopened package
Page 5
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AS3953B − Electrical Characteristics
Electrical Characteristics
All in this specification defined tolerances for external
components need to be assured over the whole operation
conditions range and also over lifetime.
Figure 6:
Operating Conditions
Symbol
Ilim
VVP_SPI
TAMB
Parameter
Min
Typ
Max
Units
30
mA
1.65
3.6
V
When logic powered from
RFID interface
1.8
3.6
V
When logic powered from
VP_SPI interface
-40
85
ºC
Limiter current
Note
Till this current limiter
clamps VLC1-LC2 to 5.0V
SPI power supply
Ambient
temperature
DC/AC Characteristics for Digital Inputs and
Outputs
Figure 7:
CMOS Inputs, Valid for Input Pins /SS, MOSI, SCLK
Symbol
Parameter
VIH
High level input
voltage
VIL
Low level input
voltage
ILEAK
Input leakage current
Page 6
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Min
Typ
Max
0.7 * VP_SPI
Units
Note
V
0.3 * VP_
SPI
V
1
μA
ams Datasheet
[v1-04] 2016-Jan-07
AS3953B − Electrical Characteristics
Figure 8:
CMOS Outputs, Valid for Output Pins MISO, IRQ
Symbol
VOH
Parameter
High level output
voltage
VOL
Low level output voltage
CL
Capacitive load
RO
Output resistance
RPD
Pull-down resistance
pad MOSI
ams Datasheet
[v1-04] 2016-Jan-07
Min
Typ
Max
0.85 *
VP_SPI
Units
Note
V
200
10
ISOURCE = 1mA
VP_SPI = 3V
0.15*
VP_SPI
V
50
pF
400
Ω
kΩ
Pull-down can be
enabled while MISO
output is in tristate. The
activation is controlled
by register setting
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AS3953B − Electrical Characteristics
Electrical Specification
Figure 9:
VP_SPI = 3.0 V, Temperature 25ºC (unless noted otherwise)
Symbol
ISB_SPI
VLIM
IS
Parameter
Standby consumption
on VP_SPI
Min
1.8
Limiter voltage
Supply current
Typ
Max
Units
Note
65
100
nA
@ 25ºC; RF field not applied
2.2
2.7
μA
@ 25ºC; RF field applied
5.2
5.7
V
250
VVP_REG
Regulated supply
voltage
VHF_PON
HF_PON threshold
(rising VREG)
2.3
HF_PON hysteresis
0.8
VPOR_HY
VMOD
1.65
1.8
μA
2.01
V
ILC = 30mA (DC)
Internal supply current
measured in test mode on
VREC, 13.56 MHz alternative
pulses with amplitude 2Vpp,
negative peak at VSS, forced
to LC1 and LC2
Set to 1.8V in EEPROM
Configuration word
V
Guaranteed by design only
V
ILC = 1mA
1.2
Modulator ON voltage
drop
V
ILC = 30mA
3.3
CR
Resonance capacitor
25.2
EEEN
EEPROM endurance
100000
cycles
EERET
EEPROM retention
10
years
28
30.8
pF
Measured at 10MHz, 3.0Vpp
(2.5Vpp)
@ 125ºC
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ams Datasheet
[v1-04] 2016-Jan-07
AS3953B − Detailed Description
Detailed Description
Figure 10:
System Block Diagram
ISO 14443A
Reader
SPI
AS3953B
Microcontroller
Circuit
The AS3953B is composed of ISO 14443A PICC Analog Front-end
(PICC AFE), the ISO 14443A PICC Logic (PICC Logic), EEPROM,
SPI Interface, Level Shifters and Power Supply Manager Block
(Power Manager).
The PICC AFE is connected to an external tag coil, which forms
together with integrated resonant capacitor an LC tank with a
resonance at the external electromagnetic field frequency of
13.56 MHz. The PICC AFE has a built in rectifier and regulators.
Output of internal regulator is called VP_INT. It is used to supply
the PICC AFE and usually also the LOGIC and EEPROM (through
Power Supply Manager). Output of external regulator VP_REG
is available on a pin to supply some external circuitry.
Power Manager is controlling power supply of Logic and
EEPROM. The two blocks can be supplied either from VP_INT or
from VP_SPI (SPI power supply). In order to save current on VP_
SPI, VP_INT is used as power supply whenever it is available.
VP_SPI is only used when some activity is started over the SPI
and the VP_INT is too low to be used as a power supply.
The PICC Logic is responsible for PICC-to-PCD communication
up to the Level-4 (block transmission) of ISO 14443A. This
means that anti-collision and other low-level functionality are
implemented there.
The SPI Interface logic contains a 32 byte FIFO for block
transmission data which is exchanged on Level-4 of ISO 14443A
communication. It also contains some control and display
registers.
The EEPROM is used to store the UID, the housekeeping data
(configuration and control bits) and user data. It can be
accessed from both sides (RFID and SPI).
ams Datasheet
[v1-04] 2016-Jan-07
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AS3953B − Detailed Description
PICC AFE
Figure 11 depicts main PICC AFE building blocks.
The PICC AFE is connected to external tag coil, which together
with the integrated resonant capacitor forms an LC tank with
resonance at external electromagnetic field frequency (13.56
MHz). Figure 11 depicts the main PICC AFE building blocks.
Rectifier: Extracts DC power supply from AC voltage induced
on coil terminals.
Limiter: Limits the maximum voltage on coil terminals to
protect PICC AFE from destruction. At voltages that exceed
limiter voltage it starts to absorb current (acts as some sort of
shunt regulator).
Modulator Switch: Is used for communication PICC-to-PCD.
When switched on, it will draw current from coil terminals. This
mechanism is called load modulation. Variation of current in
the modulator switch (ON and OFF state) is seen as modulation
by the PCD.
Demodulator: Is used for communication PICC-to-PCD. It
detects AM modulation of the PCD magnetic field. The
demodulator is designed to accept modulation according to
ISO 14443A; all standard bit rates from 106 kbit/s to 848 kbit/s
are supported. The modulation for bit rate 106 kbit/s is 100%,
whereas for other bit rates it may be less.
Clock Extractor: The clock extractor extracts a digital clock
signal from the PCD carrier field frequency which is used as
clock signal by logic blocks.
HF_PON: Observes rectified regulated voltage VREC. When the
supply voltage is sufficiently high it enables operation of the
PICC AFE and the digital tag logic. A buffer capacitor and HF_
PON hysteresis guarantees that there is no reset during reader
(PCD) modulation.
Internal Regulator: Provides regulated voltage VP_INT to the
PICC AFE and in most cases also to EEPROM and logic blocks.
Typical regulated voltage VP_INT is 2.0V. A buffer capacitor is
also integrated.
External Regulator: Provides regulated voltage on external pin
VP_REG where it can be used to supply some external circuitry.
The regulated voltage and output resistance can be adjusted
using EEPROM settings (see Figure 36). Appropriate external
buffer capacitor is needed in case VP_REG is used in the
application. The current to be provided depends on reader field
strength, antenna size and Q factor, but it is limited to maximum
5mA.
Bias: Provides bias currents and reference voltages to PICC AFE
analog blocks.
Page 10
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ams Datasheet
[v1-04] 2016-Jan-07
AS3953B − Detailed Description
Figure 11:
PICC AFE Block Diagram
VP_REG
Rectifier
Limiter
VREC
VP_INT
External
Regulator
Internal
Regulator
LC1
Modulator
Switch
BIAS
HF
PON
ISO 14443 A
LOGIC
LC2
Demodulator
AS3953B
Clock
Extractor
ams Datasheet
[v1-04] 2016-Jan-07
Page 11
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AS3953B − Detailed Description
Power Manager
Power manager is controlling the positive supply voltage of the
PICC Logic, EEPROM and SPI Interface (VDD). Its inputs are VP_
INT (rectified and regulated supply extracted from PCD field)
and the VP_SPI (SPI power supply from external).
In standby mode, when the AS3953B is not in a PCD field
(condition is that rectified supply voltage is below HF_PON
threshold) and the SPI is not active (/SS is high) the VDD supply
is disconnected not to consume on VP_SPI. The only
consumption on VP_SPI is leakage of level shifters and SPI pins.
When the AS3953B is placed in a PCD field the VDD is connected
to VP_INT. This happens once the VP_INT level is above the HF_
PON threshold.
VP_SPI is connected to VDD only when the AS3953B is not in
the PCD field (rectified supply voltage is below HF_PON
threshold) and the SPI interface is activated by pulling /SS signal
low. The switch to VP_SPI is controlled by /SS signal. The
deactivation is delayed by 0.7ms min., thus the switch stays on
in case the time between successive SPI activations is short.
During EEPROM writing, which is activated over the SPI, the
switch is also active.
At activation of the switch the time between the falling edge
of /SS signal and rising edge of SCLK has to be at least 50μs to
allow charging of internal VDD buffer capacitor and expiration
of POR signal. Please note that the only SPI operations, which
are allowed in this mode, are reading and writing of the EEPROM
and registers.
Figure 12:
Power Manager Concept
VP_INT
PON
VDD
/SS
EEPROM
WRITE
Page 12
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DELAY
VP_SPI
ams Datasheet
[v1-04] 2016-Jan-07
AS3953B − Detailed Description
ISO 14443A Framing Mode
When Framing mode is selected the PICC logic performs receive
and transmit framing according to the selected ISO 14443A bit
rate.
During reception it recognizes the SOF, EOF and data bits,
performs parity and CRC check, organizes the received data in
bytes and places them in the FIFO.
During transmit, it operates inversely, it takes bytes from FIFO,
generates parity and CRC bits, adds SOF and EOF and performs
data encoding.
Default bit rate in the Framing mode is fc/128 (~106 kbit/s).
Higher data rates may be configured by controller by writing
the Bit Rate Definition Register.
In order to respect the PCD-to-PICC frame delay according to
ISO14443-3 at data rate fc/128 bit the PICC logic synchronizes
the response to the beginning of the next response window,
but not earlier than window with n=9.
In this mode the EEPROM can be accessed via SPI when the RF
field is active.
ISO 14443A Level-4 Protocol Mode
When Level-4 Protocol mode is selected the PICC Logic
autonomously execute complete ISO 14443A Level-3
communication and certain commands of Level-4. This also
includes the anti-collision sequence during which the AS3953B
UID number is read by the PCD (7 bytes UID is supported), the
AS3953B is brought in the selected state (ISO14443-4) in which
data exchange between the AS3953B and the PCD can start. On
this level also a reading and writing of the AS3953B EEPROM is
possible.
In case the configuration bit irq_l4 is set an interrupt is
automatically sent to controller once the PICC Logic enters in
ACTIVE(*) state (after sending SAK on Cascade Level 2).
Support of ISO 14443A Level-4
ISO 14443A-4 commands RATS, PPS and DESELECT are
implemented in the PICC Logic. RATS and PPS define
communication parameters, which are going to be used in the
following data exchange by using the block transmission
protocol. The advantage of implementing PPS that defines the
bit rate used for communication, is that all bit rate issues are
handled by the PICC Logic. The MCU gets the information about
the actual receive and transmit bit rate by reading a dedicated
display register. It has to be fast enough to serve receive and
transmit at the maximum bit rate.
Execution of the block transmission protocol is left to the
controller. In case of receiving the block data from the PCD the
PICC Logic provides support by detecting and removing start
bit, stop bit, parity bits and CRC. Parity bits and CRC are also
checked. When the block data is sent to the PCD the PICC Logic
calculates and inserts start bit, parity bits, CRC and stop bit.
ams Datasheet
[v1-04] 2016-Jan-07
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AS3953B − Detailed Description
DESELECT puts the PICC Logic in HALT state. An interrupt is sent
to controller upon reception of DESELECT command to inform
it that PCD stopped the Level-4 communication.
Additionally to supporting the ISO14443-4 transmitting
protocol the PICC Logic accepts also proprietary commands.
Proprietary commands are identified by setting the two MSB
bits of first transmitted byte to ‘01’ (This combination is not
used by ISO 14443A Level-4 protocol). The following custom
commands are implemented:
• Wake-Up: Sends a wake-up interrupt to controller
• Read EEPROM: Reads data from EEPROM
• Write EEPROM: Writes data to EEPROM
Support of ISO 14443A Optional Features
• CID is supported
• NAD is not supported
• Historical bytes are not supported
• Power level indication is not supported
Coding of UID
Anti-collision procedure is based on Unique Identification
Number (UID). The AS3953B supports double UID size (7 bytes).
First three bytes of UID are hard-wired inputs to the PICC Logic
(uid<23:0>). Last 4 bytes of UID are stored in EEPROM UID word.
First Byte of UID (uid0)
First byte of UID is according to [ISO3] ISO/IEC 7816-6 IC
Manufacturer ID. It is coded on bits uid<7:0>. ams IC
Manufacturer ID is 3F(hex).
Second Byte of UID (uid1)
Second byte of UID – uid<15:8> is reserved for ams chip type (IC
Type). Every ams RFID tag IC has its own chip type attributed.
Therefore PCD which has read the RFID tag UID knows to which
tag IC it is talking.
The AS3953B IC type is 10(hex).
Third Byte of UID (uid2)
Third byte of UID – uid<23:16> is set to 00(hex). Figure below
defines the coding of the first three bytes of UID.
Figure 13:
Coding of First Three Bytes of UID
Page 14
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UID Byte
FL Signal Name
Value (hex)
uid0
uid<7:0>
3F
uid1
uid<15:8>
10
uid2
uid<23:16>
00
ams Datasheet
[v1-04] 2016-Jan-07
AS3953B − Detailed Description
The last 4 bytes of UID are read from EEPROM (UID word).Figure
below defines the last four bytes of UID.
Figure 14:
Coding of Last Four Bytes of UID
UID Byte
UID Word Bits
uid3
b7-b0
uid4
b15-b8
uid5
b23-b16
uid6
b31-b24
Coding of ATQA, SAK and ATS
Several bits of responses ATQA, SAK and ATS are defined as
“don’t care” in the ISO 14443A standard. Some others are
defined by optional choices in standard protocol. This section
defines how these bits are set by the AS3953B.
ATQA
ATQA is response to REQA and WUPA commands. Figure below
defines the ATQA coding.
Figure 15:
ATQA Coding
b16
b15
b14
b13
b12
b11
b10
b9
b8
b7
b6
b5
b4
b3
b2
b1
0
0
0
0
0
0
0
0
0
1
0
0
0
1
0
0
UID size
Bit frame anti-collision
Bits b16 to b13 are RFU bits which must be set to ‘0’.
Bits b12 to b9 are proprietary coding and are set to ‘0’.
Bits b8 and b7 indicate double size UID.
Bit b6 is ‘RFU’ bit and is set to ‘0’.
For bit frame anti-collision, the code 00100 is chosen.
ams Datasheet
[v1-04] 2016-Jan-07
Page 15
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AS3953B − Detailed Description
SAK
SAK is response to SELECT command. AS3953B UID has double
size, which defines SAK responses for Cascade Level 1 and
Cascade Level 2.
Cascade Level 1: According to ISO 14443-3, all bits except b3
are “don’t care” for Cascade Level 1. Figure below defines
Cascade Level 1 coding.
Figure 16:
Cascade Level1 Coding
b8
MSB
b7
b6
b5
b4
b3
b2
b1
LSB
Description
0
0
As b6 in
SAK CL2
0
0
1
0
0
Cascade bit set: UID not
complete
Bit b6 in Cascade Level 1 is always set as bit b6 in Cascade Level
2. This is done in accordance to EMVCo Level – 1 Contactless
Digital Test specifications.
Cascade Level 2: According to ISO 14443-3 all bits except b6
and b3 are “don’t care” for Cascade Level 2.
If configuration bit16 [nl4] is set to logic ‘0’ (default state), the
SAK on Cascade Level 2 reports that tag is compliant to level4
(see figure below).
Figure 17:
Cascade Level 2 Coding (ISO/IEC14443-4 compliant)
b8
MSB
b7
b6
b5
b4
b3
b2
b1
LSB
0
0
1
0
0
0
0
0
Description
UID complete, tag is
compliant to
ISO/IEC14443-4
If configuration bit16 [nl4] is set to logic ‘1’, the SAK on Cascade
Level 2 reports that tag is NOT compliant to Level-4 (see figure
below).
Figure 18:
Cascade Level 2 Coding (NOT ISO/IEC14443-4 compliant)
b8
MSB
b7
b6
b5
b4
b3
b2
b1
LSB
0
0
0
0
0
0
0
0
Page 16
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Description
UID complete, tag is NOT
compliant to
ISO/IEC14443-4
ams Datasheet
[v1-04] 2016-Jan-07
AS3953B − Detailed Description
ATS
ATS is response to ISO 14443-4 command RATS. The content of
the ATS is used to inform the PCD about PICC capability (like
the maximum frame size, support of higher bit rates, etc.)
Several response fields of ATS are stored in EEPROM
configuration word. The AS3953B ATS is composed of following
5 bytes according to [ISO4]: TL, T0, TA(1), TB(1) and TC(1).
TL: This is the length byte. Since ATS is composed of 5 bytes, its
content is 0x05. Figure below defines the coding of the TL byte.
Figure 19:
TL Byte Coding
b8
MSB
b7
b6
b5
b4
b3
b2
b1
LSB
Description
0
0
0
0
0
1
0
1
Coding of ATS byte TL
T0: This is the format byte. Figure below defines the coding of
the T0 byte.
Figure 20:
T0 Byte Coding
b8
MSB
b7
b6
b5
b4
b3
b2
b1
LSB
Description
0
1
1
1
fsci<3>
fsci<2>
fsci<1>
fsci<0>
Coding of ATS byte T0
TC(1)
TB(1)
TA(1)
FCSI
Bit b8 is set to ‘0’.
Bits b7 to b5 indicate presence of bytes TA(1), TB(1) and TC(1)
and hence are all set to ‘1’.
Bits b4 to b1 are called FCSI and codes FCS. The FCS is maximum
size of a frame defined by PICC. It is defined by configuration
bits fsci<3:0>.
TA(1): This codes the bit rate capability of PICC. Supported
higher bit rates of AS3953B are 212, 424 and 848 kbit/s. However
in specific applications, it is advised to report lower capability
to PCD (for example, due to the usage of slow controller or low
power application). Due to this reason the TA(1) response is
configurable using configuration bits.
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AS3953B − Detailed Description
Figure 21:
TA(1) Byte Coding
b8
MSB
dr_sdr
b7
b6
b5
b4
b3
b2
b1
LSB
Description
dr_
picc_8
dr_
picc_4
dr_
picc_2
0
dr_
pcd_8
dr_
pcd_4
dr_
pcd_2
Coding of ATS byte TA(1)
DS (PICC to PCD)
DR (PCD to PICC)
Bit b8 set to ‘0’ codes possibility of having different data rates
for each direction.
TB(1): The interface byte TB(1) conveys information to define
the frame waiting time and the start-up frame guard time. The
interface byte TB(1) consists of two parts:
• The most significant half-byte b8 to b5 is called FWI and
codes frame waiting time (FWT).
• The least significant half byte b4 to b1 is called SFGI and
codes a multiplier value used to define the SFGT. The SFGT
defines a specific guard time needed by the PICC before
it is ready to receive the next frame after it has sent the
ATS. SFGI is coded in the range from 0 to 14. The value of
‘0’ indicates ‘No SFGT needed’.
• The SFGT bits are fixed to default value which is 0x0, while
the FWI bits are defined by configuration bits fwi<3:0>.
Figure below defines the coding of the TB(1) byte.
Figure 22:
TB(1) Byte Coding
b8
MSB
b7
b6
b5
b4
b3
b2
b1
LSB
Description
fwi<3>
fwi<2>
fwi<1>
fwi<0>
0
0
0
0
Coding of ATS byte TB(1)
FWI
SFGI
• TC(1): The interface byte TC(1) specifies a parameter of
the protocol. The interface byte TC(1) consists of two
parts:
• The most significant bits b8 to b3 are set to 000000, all other
values are ‘RFU’.
• The bits b2 and b1 define which optional fields in the
prologue field are supported by the PICC. The PCD is
allowed to skip fields that are supported by the PICC. Bit
b2 indicates support of CID and b1 indicates support of
NAD. The AS3953B value is ‘10’ indicating “CID supported”
and “NAD not supported”.
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AS3953B − Detailed Description
Figure below defines the coding of the TC(1) byte.
Figure 23:
TC(1) Byte Coding
b8
MSB
b7
b6
b5
b4
b3
b2
b1
LSB
Description
0
0
0
0
0
0
1
0
Coding of ATS byte TC(1)
CID
NAD
Proprietary Commands
Proprietary commands have the same format as blocks defined
in ISO 14443-4 with the difference that optional NAD field is
abandoned since NAD is not supported by the AS3953B. The
same format is used for commands sent by PCD and AS3953B
responses. Figure below defines the coding of the Proprietary
commands.
Figure 24:
Proprietary Commands Coding
Prologue Field
PCB
[CID]
1 byte
1 byte
Information
Field
Epilogue
Field
INF
EDC
2 bytes
Prologue field consists of the mandatory Protocol Control Byte
and an optional Card Identifier Byte. Card identifier byte is
according to ISO 14443-4 definition. Epilogue field contains
CRC over transmitted block.
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AS3953B − Detailed Description
Prologue Field for Proprietary Commands
Figure below defines the coding of Prologue field for
Proprietary commands.
Figure 25:
Prologue Field (proprietary commands)
Bit
Value
b8
0
b7
1
b6
0
b5
1
Function
01 indicates proprietary command
b4
Shall be set to this value, other
values are ‘RFU’
CID following if bit is set to ‘1’
b3
1
b2
0
b1
1
Shall be set to this value, other
values are ‘RFU’
The following proprietary commands are implemented:
• Wake-Up: Sends a wake-up interrupt to controller
• Read EEPROM: Reads data from EEPROM
• Write EEPROM: Writes data to EEPROM
Wake-Up Command
Information field of Wake-Up command consists of one byte
only (see figure below). The AS3953B echoes back the same
information field.
Figure 26:
Wake-Up Command
01h
1byte
Figure below defines the coding of the AS3953B reply INF to
Wake-Up command.
Figure 27:
Wake-Up Reply
01h
1byte
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AS3953B − Detailed Description
Word Address Byte
Both proprietary commands related to EEPROM (Read and
Write) use Word Address byte to define the address of EEPROM
word that is accessed. Seven MSB bits of the Address Byte are
used to define the address, while the last bit is “don’t care”.
Note(s): The valid range for the Word Address byte is from 0000
000xb to 0011 111xb (EEPROM words from 00h to 1Fh).
Read EEPROM
The Read EEPROM command is used to read data from the
EEPROM. The request information field contains the following
three bytes:
• Command code byte (02h)
• Address of the first word to be read
• Number of words to be read
Figure below defines coding of Read EEPROM command
information field.
Figure 28:
Read EEPROM Command
02h
Address of First
Word to Be Read
Number of Words
(≤ 8) to Be Read
1byte
1byte
1byte
If the request is normally processed, the reply information field
contains the status word 90h followed by the data. In case of
error, the information field only contains the error status byte.
The following rules apply:
• In case the number of words to be read is higher than 8,
first eight words are read.
• In case the read protected word (its read lock bit is set) is
accessed, an all ‘0’ data is sent out.
• In case the reading starts at valid address and the number
of words to read is such that the reading would be done
beyond the EEPROM addressing space, all ‘0’ data is
returned for non-existing addresses.
• In case the reading starts at non-existing address, error
information field is returned.
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AS3953B − Detailed Description
Figure below defines the coding of the AS3953B reply
information field to Read EEPROM command, if command is
normally processed.
Figure 29:
Read EEPROM Reply (successful)
90h
Data
1byte
4 to 32 bytes
Figure below defines the coding of the AS3953B reply
information field to Read EEPROM command, in case of an
error.
Figure 30:
Read EEPROM Reply (error code)
Information Field
Comment
61h
Error (no diagnostic)
Write EEPROM
The Write EEPROM command is used to write one EEPROM
word (32 bits). The request information field contains 6 bytes:
• Command code byte (04h)
• Address of the word to be written
• Four bytes (32 bits) of data to be written
Figure below defines coding of Write EEPROM command
information field.
Figure 31:
Write EEPROM Command
04h
Address of Word to Be Written
Data
1 byte
1 byte
4 bytes
The AS3953B reply contains one byte informing whether the
writing of EEPROM was executed or whether there was an error.
Prior to actual programming of data in EEPROM, the control
logic checks whether there is enough power available. This is
done by performing so called power check during which a
dummy EEPROM programming is started. If the power check
fails, EEPROM programming is not performed and an error code
is sent. The EEPROM programming is a time consuming
operation.
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AS3953B − Detailed Description
Therefore, if the EEPROM programming is executed, the
AS3953B reply comes after 8ms typical. Figure below defines
the coding of the AS3953B reply to Write EEPROM command.
Figure 32:
Write EEPROM Reply
Information Field
Comment
90h
Writing is normally processed
61h
Writing is not done due to coding
error (error in parity, CRC, nonexistent
address…)
62h
Writing is not done since the word is
locked
64h
Writing is not done due to power
check fail
Passing of Block Data to Controller
After the PICC Logic has passed the anti-collision procedure and
replied with SAK on Cascade Level 2 it passes in ACTIVE(*) state.
On this level it expects that blocks received from the PCD have
the format according to ISO 14443A-4. The ISO 144443A Logic
recognizes the command by observing the first received byte.
Based on content of this byte command is either processed by
the AS3953B or the complete block data is put in the FIFO for
further processing by the controller. The figure below displays
the decision criteria.
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AS3953B − Detailed Description
Figure 33:
First Byte of the ISO 14443-4 PCD Block
First Byte
1110 0000
Comment
Action of PICC Logic
Replies with ATS (1)
RATS
1110 not(0000)
Block is put in FIFO
1101 xxxx
PPS
Replies with PPS response
(second character is CID)(1)
1100 x 010
DESELECT
Replies and go to Halt
See note (2)
Block is put in FIFO
1111 xxxx
WTX, S(PARAMETERS), RFU (1)
Block is put in FIFO since controller needs it to
implement chaining
01xx xxxx
Proprietary command
Proprietary command is processed
00xx xxxx
I-block
10xx xxxx
R-block
1100 x not(010)
Block is put in FIFO
Note(s):
1. RATS and PPS are only processed by the AS3953B logic in case they are sent according to the ISO 14443-4 specification (RATS is first
command sent after entry in ACTIVE(*) state, optionally followed by PPS). In case RATS or PPS are sent once the AS3953B logic is in
PROTOCOL state the information received is saved into FIFO and not acted upon.
2. Compatible with old and new S(PARAMETERS) definition: Old: 1100 x000 is S(PARAMETERS) block according to the ISO 14443-4/AM2.
New: 1111 x000 is S(PARAMETERS) block according to the modification SC17/WG8.
As shown in Figure 33, the block data is put in the FIFO
whenever the two MSB bits are 00 or 10 and also in the case
when the four MSB bits are 1111. Therefore the implemented
communication between the PCD and a tag implemented by
the AS3953B and a controller does not need to follow the Block
transmission protocol defined in the ISO 14443-4.
Use of CID
As mentioned above the AS3953B decides depending on
content of the first byte of received message to either execute
received message as a command or to put it in the FIFO. The
second byte of the message comprises a CID number which is
attributed by PCD. PCD will use CID number in case more PICCs
are brought to Level-4 of communication at the same time.
CID is only checked for messages (commands) that are executed
by the AS3953B. In case CID does not match such a command
is rejected (no action is taken).
Messages that are based on first byte are put in FIFO and are
not filtered by CID. It is left to controller to check for the CID
and decide whether or not to reply (CID number is stored in the
RATS Register).
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AS3953B − Detailed Description
ISO 14443A Level-3 Protocol Mode
Level-3 Protocol mode is intended for implementation of
custom protocols for which coding on Level-4 of ISO 14443A
communication according to Figure 33 is not appropriate. In
this mode Level-2 and Level-3 behavior of the PICC logic is
identical to ISO 14443A Level-4 Protocol mode, while on Level-4
all received data blocks are put in FIFO.
In case the configuration bit irq_l4 is set an interrupt is
automatically sent to controller once the PICC Logic enters in
ACTIVE(*) state (after sending SAK on Cascade Level 2).
In this mode the EEPROM can be accessed via SPI when the RF
field is active.
Transparent Mode
In the Transparent Mode the AS3953B logic is bypassed, AFE
input and output signals are directly available on SPI interface
pins when /SS signal is high.
• Modulator switch is controlled by pin MOSI (high is
modulator on)
• Clock extractor output is sent to pin MISO
• Demodulator output is sent to pin IRQ
When /SS signal is low the SPI interface pins resume its normal
functionality. In this mode the EEPROM can be accessed via SPI
when the RF field is active.
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AS3953B − Detailed Description
EEPROM
The AS3953B contains an EEPROM block which can be accessed
from both RFID and SPI interface. EEPROM contains 1024 bits
(128 bytes) organized in 32 words of 32 bits. Words in EEPROM
are number from 0 to 31(1F[hex]). Bits in a word are numbered
from 0 to 31.
Most of the EEPROM is used to store user data (27 words – 864
bits), five words are used to store some housekeeping
information (part of the AS3953B UID, configuration bits which
define the AS3953B operating options, lock bits, which control
the possibility to write EEPROM words).
Figure 34:
EEPROM Organization
Word Address [hex]
Content
Access Properties
0
UID
RO
1
Fabrication Data
RO
2
Configuration Word
RW
3
Write Lock Word
OTP
4
Read Lock Word
OTP
5: 1F
User Data
RW
Access Properties:
RO: Read only, writing to this word is not possible
RW: Reading and writing to this word is possible, writing is
disabled once the lock bit is set
OTP: One time programmable. A bit of this word once set to ‘1’
cannot be set back to ‘0’.
UID Word
The UID word contains four LSB bytes of 7 byte UID which is
used during anti-collision and selection process. Every IC is
programmed by a unique number during fabrication process at
ams. For details on UID, please refer to Coding of UID.
Fabrication Data Word
This word stores some IC manufacturer data which is
programmed and locked during fabrication process at ams.
Configuration Word
The Configuration word is used to define the AS3953B
operating options. It is delivered by ams with default setting.
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AS3953B − Detailed Description
Figure 35:
Configuration Word (Bits 31 to 16)
Configuration Bit
Name
Default
Function
b31
fsci<3>
0
b30
fsci<2>
0
b29
fsci<1>
1
b28
fsci<0>
0
b27
fwi<3>
0
b26
fwi<2>
1
b25
fwi<1>
1
b24
fwi<0>
0
b23
dr_sdr
0
1: Only the same bit rate for both directions
supported (TA(1) of ATS)
b22
dr_picc_8
0
1: DR=8 PICC-to-PCD supported (848kbit/s)
(TA(1) of ATS)
b21
dr_picc_4
0
1: DR=4 PICC-to-PCD supported (424kbit/s)
(TA(1) of ATS)
b20
dr_picc_2
0
1: DR=2 PICC-to-PCD supported (212kbit/s)
(TA(1) of ATS)
b19
dr_pcd_8
0
1: DR=8 PCD-to-PICC supported (848kbit/s)
(TA(1) of ATS)
b18
dr_pcd_4
0
1: DR=4 PCD-to-PICC supported (424kbit/s)
(TA(1) of ATS)
b17
dr_pcd_2
0
1: DR=2 PCD-to-PICC supported (212kbit/s)
(TA(1) of ATS)
b16
nl4
0
1: SAK on Cascade Level 2 reports that tag is not
ISO 14443-4 compatible
b15
nfc
0
1: SAK on Cascade Level 2 reports that tag is NFC
passive target
FSCI. Default value (2h) codes maximum size of
frame accepted by PICC to 32 bytes which is the
size of the FIFO. Please note that the AS3953B can
support larger frame sizes in case FIFO is read
during the receiving.
FWI (default value (6h) defines frame waiting time
of ~19.3ms)
Note(s):
1. Configuration bits b31 to b15 define AS3953B response to SAK and ATS command in ISO 14443A Protocol modes, while bits b14 to
b0 actually change performance.
2. Incase both nl4 and nfc are set, the nl4 setting prevails.
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AS3953B − Detailed Description
Figure 36:
Configuration Word (Bits 14 to 0)
Configuration Bit
Name
Default
Function
b14
irq_pu
0
1: Send a power-up IRQ (after power-up
initialization is finished)
b13
irq_l4
0
1: Send an IRQ at entry in ACTIVE(*) state (after
sending SAK on Cascade Level 2) (2)
b12
mod_1
0
b11
mod_0
0
b10
rxncrc
0
1: Rx – CRC is not checked, CRC part of message is
also put in FIFO (3)
b9
rxbs
0
1: Rx – Bit stream mode, received bits are put in
FIFO (no parity and CRC check) (3)
b8
txncrc
0
1: Tx – Do not generate CRC (3)
b7
txbs
0
1: Tx – Bit stream mode, bits put in FIFO are sent
without parity and CRC generation (3)
b6
fdel<1>
0
b5
fdel<0>
0
b4
vreg<1>
0
00: ISO 14443A Level-4 Protocol mode
01: ISO 14443A Level-3 Protocol mode
10: Framing mode
11: Transparent mode
PCD-to-PICC delay adjustment (4)
b3
vreg<0>
0
b2
rreg<1>
0
b1
rreg<0>
0
b0
dr8
0
00: 1.8V
10: 2.7V
01: 2.0V
11: 3.3V
External Regulated voltage (VP_
REG) setting
00: disabled
10: 50Ω
01: 100Ω
11: 25Ω
External Regulator enable and
output resistance setting
Reserved for internal use
Note(s):
1. Configuration bits b31 to b15 define AS3953B response to SAK and ATS command in ISO 14443A Protocol mode, while bits b14 to
b0 actually change performance.
2. Applicable in ISO 14443A Level-3 and Level-4 Protocol modes.
3. Applicable in ISO 14443A Level-3 Protocol mode and Framing mode, in Protocol mode applicable for frames which are put in FIFO.
4. Configuration bits fdel<1:0> are used to adjust frame delay time PCD-to-PICC. Delays caused by reader and tag resonant tanks and
AFE processing are compensated by PICC logic.Figure below defines PCD-to-PICC frame delay compensation using fdel bits.
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AS3953B − Detailed Description
Figure 37:
PCD-to-PICC Frame Delay Compensation
fdel<1:0>
Delay [ns]
Delay [number of 13.56 MHz periods]
00
442.5
6
01
295.0
4
10
147.5
2
11
590.0
8
OTP Words
Write and Read Lock Words are OTP (One Time Programmable).
This means that once they are set to ‘1’, they cannot be reset
back to ‘0’. Since setting of OTP bits is an irreversible operation,
it is strongly recommended to perform it in controlled
environment.
Write Lock Word
The Write Lock Word contains write lock bits. Each EEPROM
word has a corresponding lock bit in the Write Lock Word. Once
a certain lock bit is set to ‘1’, the content of corresponding word
cannot be modified any more (it becomes read only), EEPROM
write commands issued either through PICC interface or
through SPI interface are rejected. The lock bit of a certain
number protects the word with the same number (e.g. b5 of lock
word protects word 5). Since lock bits are OTP they cannot be
reset back to ‘0’ once they are set to ‘1’.Therefore once a certain
word is locked it cannot be unlocked any more. The lock bits for
page 0 is “don’t care” since word 0 is always read only. Please
note that setting lock bit b2 locks the Lock Word itself, therefore
once this bit is set the lock configuration cannot be modified
any more.
Read Lock Word
The Read Lock Word contains read lock bits. Each EEPROM word
has a corresponding lock bit in the Read Lock Word. Once a
certain lock bit is set to ‘1’, the content of corresponding word
cannot be read through PICC interface, it can only be read
through SPI interface. The lock bit of a certain number protects
the word with the same number (e.g. b5 of lock word protects
word 5). Since lock bits are OTP they cannot be reset back to ‘0’
once they are set to ‘1’. Therefore once a certain word is locked
it cannot be unlocked any more. The lock bits for pages 0 to 4
are “don’t care”; these pages can be read through PICC interface
even in case their corresponding lock bits are set.
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AS3953B − Application Information
Application Information
SPI Interface
Communication between the AS3953B and controller is done
through a 4-wire Serial Peripheral Interface (SPI) and additional
interrupt signal. The AS3953B is an SPI slave device; it requests
controller attention by sending an interrupt (IRQ pin).
Figure 38:
SPI and Interrupt Signals
Name
Signal
Signal Level
/SS
Digital input with pull-up
CMOS
SPI enable (active low)
MOSI
Digital input
CMOS
Serial data input
MISO
Digital output with
tristate
CMOS
Serial data output
SCLK
Digital input
CMOS
Clock for serial communication
Digital output
CMOS
Interrupt output pin
IRQ
Description
While signal /SS is high the SPI interface is in reset, while it is
low the SPI interface is enabled. It is recommended to keep
signal /SS high whenever the SPI interface is not in use. MOSI is
sampled at the falling edge of SCLK. All communication is done
in blocks of 8 bits (bytes). First three bits of first byte transmitted
after high to low transition of /SS define SPI operation mode.
MSB bit is always transmitted first (valid for address and data).
Read and Write modes support address auto incrementing,
which means that in case after the address and first data byte
some additional data bytes are sent (read), they are written to
(read from) addresses incremented by ‘1’.
SPI interface supports the following modes:
• Read and write of the SPI Interface internal registers
• Read and write of the EEPROM
• Read and write of the FIFO
• Sending direct commands
Please note that the only SPI operations, which are allowed
when logic and EEPROM are supplied from VP_SPI, are reading
and writing of EEPROM and registers (see also Power Manager)
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AS3953B − Application Information
Figure 39:
SPI Modes
MODE Pattern (communication bits)
MODE
MODE
Trailer
MODE Related Data
M2
M1
M0
C4
C3
C2
C1
C0
Register
Write
0
0
0
A4
A3
A2
A1
A0
Data byte (or more bytes in
case of auto incrementing)
Register
Read
0
0
1
A4
A3
A2
A1
A0
Data byte (or more bytes in
case of auto incrementing)
EEPROM
Write
0
1
0
0
0
0
0
0
Word
Address byte
4 bytes of
word data
4 bytes of
word data (or
multiple
words in case
of auto
incrementing
EEPROM
Read
0
1
1
1
1
1
1
1
Word
Address byte
FIFO Load
1
0
0
0
0
0
0
0
One or more bytes of FIFO
data
FIFO Read
1
0
1
1
1
1
1
1
One or more bytes of FIFO
data
COMMAND
Mode
1
1
C5
C4
C3
C2
C1
C0
MISO output is usually in tristate, it is only driven when output
data is available. Due to this the MOSI and the MISO can be
externally shorted to create a bidirectional signal.
During the time the MISO output is in tristate, it is possible to
switch on a 10 kΩ pull-down by activating option bits miso_pd1
and miso_pd2 in IO Configuration Register.
Figure 40:
Signal to Controller
Separate SPI Input and Output Signals to Controller
MOSI
MOSI
MISO
ams Datasheet
[v1-04] 2016-Jan-07
MOSI
µC
AS3953B
MISO
Bi-directional Data IO Signal to Controller
AS3953B
I/O
µC
MISO
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AS3953B − Application Information
Writing of Data to Addressable Registers
(Register Write Mode)
Following figures show cases of writing a single byte and
writing multiple bytes with auto-incrementing address. After
the SPI operation mode bits, the address of register to be
written is provided. Then one or more data bytes are transferred
from the SPI, always from the MSB to the LSB. The data byte is
written in register on falling edge of its last clock. In case the
communication is terminated by putting /SS high before a
packet of 8 bits composing one byte is sent, writing of this
register is not performed. In case the register on the defined
address does not exist or it is a read only register no write is
performed.
Note(s): When the AS3953B is powered via vp_SPI and not via
field; the registers and EEPROM can be readout. When CS is set
to low, after 50us of the falling edge, the Registers and the
EEPROM can be readout. Nevertheless, if there is no activity for
1ms, there is a timeout and the logic goes to sleep, hence losing
the values in the registers. (EEPROM values are retained).
Figure 41:
Writing of a Single Register
/SS
SCLK
MOSI
X
0
0
Three leading
bits indicate
Mode
0
A4
A3
A2
SCLK rising
edge Data is
transfered from
µC
A1
A0
D7
D6
D5
D4
SCLK falling
edge Data is
sampled
D3
D2
D1
X
D0
/SS rising
edge signals
end of WRITE
Mode
Data is moved to
Address
A4-A0
Figure 42:
Writing of Register Data with Auto-Incrementing Address
/SS
SCLK
MOSI
X
0 0 0
A A A A A D D D D D D D D D D D D D D D D D D
4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6
Three leading
bits indicate
Mode
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Data is moved
to Address
<A4-A0>
Data is moved to
Address
<A4-A0> + 1
D D D D D D D D D D
1 0 7 6 5 4 3 2 1 0
Data is moved to
Address
<A4-A0> + (n-1)
Data is moved to
Address
<A4-A0> + n
X
/SS raising edge
signals end of
WRITE Mode
ams Datasheet
[v1-04] 2016-Jan-07
AS3953B − Application Information
Reading of Data from Addressable Registers
(Register Read Mode)
After the SPI operation mode bits the address of register to be
read has to be provided from the MSB to the LSB. Then one or
more data bytes are transferred to MISO output, always from
the MSB to the LSB. As in case of the write mode also the read
mode supports auto-incrementing address.
MOSI is sampled at the falling edge of SCLK (like shown in the
following diagrams); data to be read from the AS3953B internal
register is driven to MISO pin on rising edge of SCLK and is
sampled by the master at the falling edge of SCLK.
In case the register on defined address does not exist all ‘0’ data
is sent to MISO.
In the following figure example for reading of single byte is
given.
Figure 43:
Reading of a Single Register
/SS
SCLK
MOSI
X
0
0
MISO
A4
A3
A2
A1
SCLK rising
edge Data is
transfered
from µC
X
A0
D
7
X
Three leading
bits indicate
Mode
ams Datasheet
[v1-04] 2016-Jan-07
1
SCLK falling
edge Data is
sampled
D
6
SCLK rising
edge Data is
moved from
Address
<A4-A0>
D
5
D
4
SCLK falling
edge Data is
transfered to
µC
D
3
D
2
D
1
D
0
X
/SS rising
edge signals
end of READ
Mode
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AS3953B − Application Information
Writing and Reading of EEPROM Through SPI
EEPROM data can be read and written also through SPI
interface. Due to possible conflict with RFID interface trying to
access the EEPROM in ISO 14443A - level4 mode, access is
granted to SPI only in case the PICC AFE is not active.
In all other modes defined in Mode Definition Registers, the
EEPROM can be accessed via SPI when the RF field is active.
Activity of the PICC AFE can be checked by observing hf_pon bit
of RFID Status Display Register. In case PICC AFE is activated
while the EEPROM writing or reading operation is going on, this
operation is interrupted, and l_ee_spi IRQ is sent.
Word Address Byte
Both EEPROM modes (Read and Write) use Word Address byte
to define the address of EEPROM word which is accessed. 7 MSB
bits of the Address Byte are used to define the address; while
the last bit is “don’t care” (utilized to synchronize EEPROM
access).
Note(s): The valid range for the Word Address byte is from 0000
000xb to 0011 111xb (EEPROM words from 00h to 1Fh).
Figure below defines the EEPROM Word Address byte.
Figure 44:
EEPROM Word Address Byte
EEPROM Word
Address
B7
B6
B5
B4
B3
B2
B1
B0
WA6
WA5
WA4
WA3
WA2
WA1
WA0
x
EEPROM Write
In order to program an EEPROM word six bytes have to be sent
(mode byte, word address byte and 4 bytes of word data, all of
them MSB first)). Actual programming of EEPROM is started with
rising edge of /SS signal which terminated the EEPROM Write
command. During EEPROM programming the controller is not
allowed to start another SPI activity. Controller is informed
about the end of EEPROM programming by sending an
interrupt (an interrupt flag is set in the Auxiliary Interrupt
Register). I_eew flag is set in case EEPROM programming is
normally finished; in case of an error (writing to write protected
word, writing to non-existent address) an error flag (I_er_eew)
is set. Typical EEPROM programing time for one word is 8ms.
Note(s): Word data is sent MSB first which is opposite to RFID
EEPROM programming where LSB is sent first.
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AS3953B − Application Information
EEPROM Read
In order to read data from EEPROM first a mode byte is sent,
followed by the word address byte (MSB first). Then one or more
words of data with address auto incrementing (packets of 4
bytes) are transferred to MISO output, always from the MSB to
the LSB. MOSI is sampled at the falling edge of SCLK; data to be
read from the AS3953B EEPROM is driven to MISO pin on rising
edge of SCLK and is sampled by the master at the falling edge
of SCLK. In case the word on defined address does not exist all
‘0’ data is sent to MISO.
Please note that SCLK frequency should not exceed 1MHz
during EEPROM Read (limited by EEPROM read access time).
Figure 45:
Reading of EEPROM Page
/SS
SCLK
MOSI
X
0 1 1 1 1
MISO
1
W W W W W W W
1 1 A A A A A A A x
6 5 4 3 2 1 0
B B B B B B B B B B
3 3 2 2 2 2 2 2 2 2
1 0 9 8 7 6 5 4 3 2
X
1µs min
ams Datasheet
[v1-04] 2016-Jan-07
X
MSB Byte from
Address
<WA6-WA0>
X
B B B B B B B B B B
9 8 7 6 5 4 3 2 1 0
X
LSB Byte from
Address
<WA6-WA0>
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AS3953B − Application Information
Loading Transmitting Data into FIFO
Loading the transmitting data into the FIFO is similar to writing
data into an addressable registers. Difference is that in case of
loading more bytes all bytes go to the FIFO. The command mode
code 10 indicates FIFO operations. In case of loading
transmitting data into FIFO all bits <C5 – C0> are set to ‘0’. Then
a bit-stream, the data to be sent (1 to 32 bytes), can be
transferred.
Figure 46 shows how to load the transmitting data into the FIFO.
Figure 46:
Loading of FIFO
/SS
SCLK
MOSI
X
1
0
10 pattern
indicates FIFO
mode
0
0
0
SCLK rising
edge Data is
transfered
from µC
0
0
SCLK falling
edge Data is
sampled
1 to 32
bytes
0
Start of
payload Data
X
/SS rising edge
signals end of
COMMAND Mode
Reading Received Data from FIFO
Reading received data from the FIFO is similar to reading data
from an addressable registers. Difference is that in case of
reading more bytes they all come from the FIFO. The command
mode code 10 indicates FIFO operations. In case of reading the
received data from the FIFO all bits <C5 – C0> are set to ‘1’. On
the following SCLK rising edges the data from FIFO appears as
in case of read data from addressable registers. In case the
command is terminated by putting /SS high before a packet of
8 bits composing one byte is read that particular byte is
considered read.
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AS3953B − Application Information
Direct Command Mode
Direct Command Mode has no arguments, so a single byte is
sent. SPI operation mode bits 11 indicate Direct Command
Mode. The following six bits define command code, sent MSB
to the LSB. The command is executed on falling edge of last
clock.
Figure 47:
Sending a Direct Command
/SS
SCLK
MOSI
X
1
1
Two leading
ONE indicate
COMMAND
Mode
ams Datasheet
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C5
C4
C3
SCLK rising
edge Data is
transfered from
µC
C2
C1
SCLK falling
edge Data is
sampled
C0
X
/SS rising edge signals
start of command
execution
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AS3953B − Application Information
SPI Timing
Figure 48:
Timing Parameters
Symbol
Parameter
Min
Typ
Max
Units
Note
General Timing (VDD = VDD_IO = VDD_D = 3.3V, Temperature 25°C)
TSCLK=TSCLKL+TSCLKH, during
EEPROM read the SCLK period
has to be increased to 1μs (this
limitation is imposed by
EEPROM read access time)
TSCLK
SCLK period
200
ns
TSCLKL
SCLK low
80
ns
TSCLKH
SCLK high
80
ns
TSSH
SPI reset (/SS high)
50
ns
TNCSL
/SS falling to SCLK
rising
25
ns
first SCLK pulse
TNCSH
SCLK falling to /SS
rising
80
ns
last SCLK pulse
TDIS
Data in setup time
10
ns
TDIH
Data in hold time
10
ns
Read Timing (VDD = VDD_IO = VDD_D = 3.3V, Temperature 25°C, CLOAD ≤ 50pF)
TDOD
Data out delay
20
ns
TDOHZ
Data out to high
impedance delay
20
ns
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AS3953B − Application Information
Figure 49:
SPI General Timing
/SS
...
t NCSL
t SCLKH
tSCLKL
t NCSH
SCLK
...
tDIS
MOSI
tDIH
DATAI
...
DATAI
DATAI
...
MISO
Figure 50:
SPI Read Timing
/SS
...
SCLK
...
MOSI
...
DATAI
MISO
DATAO
t DOD
ams Datasheet
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...
DATAO
tDOHZ
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AS3953B − Application Information
Interrupt Interface
There are two interrupt registers implemented in the AS3953B
(Main Interrupt Register and Auxiliary Interrupt Register). Main
Interrupt Register contains information about seven interrupt
sources, while one bit references to interrupt sources detailed
in Auxiliary Interrupt Register.
When an interrupt condition is met the source of interrupt bit
is set in the Main Interrupt Register and the IRQ pin transitions
to high.
The controller then reads the Main Interrupt Register to
distinguish between different interrupt sources. In case the bit
l_aux is pointing to the Auxiliary Interrupt Register, this register
also needs to be read. After an interrupt register (main or
auxiliary) is read its content is reset to ‘0’. Exception to this rule
is the bit pointing to auxiliary register. This bit is only cleared
when the auxiliary interrupt register is read. IRQ pin transitions
to high after the interrupt bit(s) which caused its transition to
high has been read. Please note that there may be more than
one interrupt register bit set in case the controller did not
immediately read the Interrupt registers after the IRQ signal is
set and another event causing interrupt occurred.
FIFO Water Level and FIFO Status Register
The AS3953B contains a 32 byte FIFO. In case of transmitting
the Control logic shifts data which was previously loaded by the
external controller to the Framing Block and further to the
Transmitter. During reception, the demodulated data is stored
in the FIFO and the external controller can download received
data.
Transmit and receive capability of the AS3953B is not limited
by of the FIFO size due to a FIFO water level interrupt system.
During transmission an interrupt is sent (interrupt due to FIFO
water level in the Main Interrupt Register) when the content of
data in the FIFO which still need to be sent is lower than the
FIFO water level for transmit. The external controller can now
add more data in the FIFO. The same stands for receive mode.
In case the number of received bytes increases over the FIFO
water level for receive an interrupt is sent to inform the external
controller that data has to be downloaded from FIFO.
The external controller has to serve the FIFO faster than data is
transmitted or received. A general rule is that the SCLK
frequency has to be at least double than the actual data rate in
receive or transmit.
FIFO water level is set to ¾ of FIFO for reception and to ¼ of
FIFO for transmission. This means that in case of getting an
interrupt during reception there are already 24 bytes in the
FIFO, which have to be read out to liberate space for following
data bytes. Same stands for transmission, water level interrupt
is sent when there are 8 bytes left in FIFO, therefore up to 24
additional bytes can be loaded.
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AS3953B − Application Information
During FIFO operation (FIFO read or FIFO load) the water level
detection system is blocked to avoid spurious water level
interrupts (these might occur when for example number of
bytes has increased above water level during loading and
immediately after that dropped again below water level due to
Tx process which runs in parallel). Due to this the FIFO
loading/reading rate has to be higher than Tx / Rx bit rate, once
FIFO loading/reading is finished the /SS pin has to be pulled to
VDD (logic remains in FIFO load/read mode as long as /SS
remains low).
In case loading/reading of FIFO is not much faster than Tx / Rx
processes low the following two cases have to be considered:
• FIFO underflow IRQ is not blocked, in case loading in FIFO
is slower than transmission process the FIFO underflow
IRQ is produced.
• In case of slow FIFO loading it is possible that the content
of FIFO is increased above water level but it is below when
FIFO loading is finished. In such case a water level IRQ is
issued after termination of FIFO loading. Same stands for
FIFO reading.
• In case of slow FIFO loading it is possible that the content
of FIFO stays below water level during complete FIFO
loading operation. In such case water level IRQ is not
issued after termination of FIFO loading. Same stands for
FIFO reading.
• In case it is known that the receive data frame is smaller
than the FIFO size the water level interrupt does not have
to be served. In such case the water level interrupt can be
masked.
• After data is received the external controller needs to
know how long the receive data string was before
downloading data from the FIFO: This information is
available in the FIFO Status Register 1 and FIFO Status
Register 2 which display number of bytes in the FIFO which
were not read out.
The FIFO Status Register 2 additionally contains two bits which
indicate that the FIFO was not correctly served during reception
or transmission process (FIFO overflow and FIFO underflow).
FIFO overflow is set when too much data is written in FIFO. In
case this bit is set during reception the external controller did
not react on time on water level IRQ and more than 32 bytes
were written in the FIFO. The received data is corrupted in such
a case. During transmission this means that controller has
written more data than FIFO size. The data to be transmitted is
corrupted.
FIFO underflow is set when data was read from empty FIFO. In
case this bit is set during reception the external controller read
more data than was actually received. During transmission this
means that controller has failed to provide the quantity of data
defined in number of transmitted bytes registers on time.
ams Datasheet
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AS3953B − Application Information
ISO 14443A Frame Data in FIFO
Data in ISO 14443A frames is organized in bytes; each byte is
terminated by parity bit. Data bits in a byte are numbered from
b1 to b8 where b1 is LSB bit, LSB is sent first.
Data sent over SPI is also organized in bytes, bits in a byte are
marked D0 to D7, where D0 is LSB bit, MSB is sent first.
During receive the framing engine checks the parity bit and
removes it from data frame, only the data bytes are put in FIFO.
During transmission the process is inversed, only the data bytes
are put in FIFO, while the framing engine adds the parity bits.
The ISO 14443A data bits b1 to b8 are mapped to FIFO data bits
D0 to D7, which means that the order of receiving/transmitting
bits in a byte is inversed (the ISO 14443A bytes are sent LSB first
while the SPI bytes are sent MSB first).
The only exceptions to this rule are the Rx and Tx bit stream
modes. In these modes the meaning of byte is lost. In order to
simplify processing the order of bits is the same on ISO 14443A
and FIFO side.
This means that during reception with bit rxbs set the first
received bit is also the first bit read out of FIFO. In case the last
FIFO byte is not complete the bits which are not part of received
data are padded with ‘0’.
The same stands for transmission with bit txbs set: the first bit
written in FIFO is also the first bit sent.
Direct Commands
Figure 51:
List of Direct Commands
Command Byte Value
[hex]
Command
Comments
C2, C3
Set Default
Puts the AS3953B in default state
C4, C5
Clear
Stops all activities and clears FIFO
C8
Transmit
Starts a transmit sequence
D0
Go2halt
Puts PICC logic in HALT state
Set Default
This direct command puts the AS3953B in the same state as
power-up initialization. All registers are initialized to the default
state.
Clear
This direct command stops all current activities (transmission
or reception) and clears FIFO.
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AS3953B − Application Information
Transmit
This direct command transmits the data stored in the FIFO. In
Protocol modes it is only accepted on Level-4 of
communication. Before triggering transmission using Transmit
command direct command Clear has to be sent, followed by
definition of number of transmitted bytes and writing data to
be transmitted in FIFO.
Execution of this direct command is only enabled when the
AS3953B antenna coil is in a PCD field (VP_INT is above HF_PON
threshold).
Go2halt
Puts PICC logic in HALT state.
Execution of this direct command is only enabled when the
AS3953B antenna coil is in a PCD field (VP_INT is above HF_PON
threshold) and PICC Logic is in one of the two ISO 14443A
Protocol modes.
Registers
The 6-bit register addresses below are defined in the
hexadecimal notation. The possible address range is from 00h
to 3Fh.
There are two types of registers implemented in the AS3953B:
configuration registers and display registers. The configuration
registers are used to configure the AS3953B. They can be
written and read through the SPI (RW). The display registers are
read only (RO); they contain information about the AS3953B
internal state, which can be accessed through the SPI.
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AS3953B − Application Information
Overview of Registers
Figure 52:
List of the SPI Interface Internal Registers
Address [hex]
Content
Type
00
IO Configuration Register
RW
01
Mode Definition Register
RW
02
Bit Rate Definition Register
RW
04
RFID Status Display Register
RO
05
RATS Register
RO
08
Mask Main Interrupt Register
RW
09
Mask Auxiliary Interrupt Register
RW
0A
Main Interrupt Register
RO
0B
Auxiliary Interrupt Register
RO
0C
FIFO Status Register 1
RO
0D
FIFO Status Register 2
RO
10
Number of Transmitted Bytes Register 1
RW
11
Number of Transmitted Bytes Register 2
RW
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AS3953B − Application Information
IO Definition Register
Figure 53:
IO Configuration Register
Address# 00h : IO Configuration
Bit
Name
Default
Function
7
miso_pd2
x
1: Pull-down on MISO, when \SS
is low and MISO is not driven by
the AS3953B
6
miso_pd1
x
1: Pull-down on MISO when \SS
is high
5
RFU
4
RFU
3
RFU
2
RFU
1
RFU
0
RFU
Type: RW
Comments
Note(s):
1. This register is directly supplied by VP_SPI. Its initial state is unknown.
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AS3953B − Application Information
Mode Definition Registers
Figure 54:
Mode Definition Register
Address# 01h : Mode Definition
Bit
Name
Default
Function
7
RFU
6
RFU
5
r_mod_1
See note (1)
4
r_mod_2
See note (1)
3
r_rxncrc
See note (1)
1: Rx – CRC is not checked,
CRC part of message is
also put in FIFO
00: ISO 14443A Level-4
Protocol mode
01: ISO 14443A Level-3
Protocol mode
10: Framing mode
11: Transparent mode
2
r_rxbs
See note (1)
1: Rx – Bit stream mode,
received bits are put in
FIFO (no parity and CRC
check)
1
r_txncrc
See note (1)
1: Tx – Do not generate
CRC
See note (1)
1: Tx – Bit stream mode,
bits put in FIFO are sent
without parity and CRC
generation
0
r_txbs
Type: RW
Comments
ISO mode in case of register
control;
If ISO 14443A Protocol mode is
selected through registers,
logic is forced in Level-4
mode.
Applicable in ISO 14443A
Level-3 Protocol mode and
Framing mode. In Protocol
mode, applicable for frames
which are put in FIFO.
Note(s):
1. Default value is loaded from EEPROM configuration word bits b12 to b7 during power-up initialization.
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AS3953B − Application Information
Figure 55:
Bit Rate Definition Register
Address# 02h : Bit Rate Definition
Bit
Name
Default
7
tx_rate3
0
6
tx_rate2
0
5
tx_rate1
0
4
tx_rate0
0
3
rx_rate3
0
2
rx_rate2
0
1
rx_rate1
0
0
rx_rate0
0
Type: RW
Function
Comments
Bit rate for Tx
For coding see Figure 56
Bit rate for Rx
For coding see Figure 56
Note(s):
1. Default setting is set at power-up and after Set Default command. In ISO 14443A Level-4 Protocol mode, this value is rewritten after
receiving PPS command.
Figure below defines the coding of the Bit Rate.
Figure 56:
Bit Rate Coding
Rate3
Rate2
Rate1
Rate0
Bit Rate [kbit/s]
0
0
0
0
fc/128 (~106)
0
0
0
1
fc/64 (~212)
0
0
1
0
fc/32 (~424)
0
0
1
1
fc/16 (~848)
Comments
Other combinations RFU
Note(s):
1. In case a bit rate which is not supported is selected, the Tx / Rx operation is disabled.
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AS3953B − Application Information
Display Registers
Figure 57:
RFID Status Display Register
Address# 04h : RFID Status Display
Bit
Name
7
hf_pon
6
state<2>
5
state<1>
4
state<0>
Function
Type: R
Comments
1: PICC AFE is active
AFE Power-on signal
000: POWER OFF
001: IDLE
010: READY 011 – ACTIVE
101: HALT
110: READYX
111: ACTIVEX
100: L4
PICC Logic state
3
RFU
2
RFU
1
RFU
0
RFU
Note(s):
1. The information read from this register can be false during reception (the logic state change during reception and the readout of
status can be done just at the moment when the status is changing).
2. The RFID Status Display Register is not a real register. By reading this register, controller has access to specific RFID logic internal
signals in order to observe its internal state.
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AS3953B − Application Information
Figure 58:
RATS Register
Address# 05h : RATS
Bit
Name
7
fsdi3
6
fsdi2
5
fsdi1
4
fsdi0
3
cid3
2
cid2
1
cid1
0
cid0
Function
Type: R
Comments
RATS FSDI bits
Displays maximum frame size that
PCD can handle (set by PCD in
RATS command)
RATS CID bits
Displays attributed CID number
(set by PCD in RATS command)
Note(s):
1. At power-up and after Set Default, content of this register is set to ‘0’.
2. The RATS Register is used only in ISO 14443A-4 Protocol mode. It contains information sent by PCD in RATS command. The register
informs the controller about maximum frame size that the PCD can handle and the attributed CID number.
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AS3953B − Application Information
Interrupt Register and Associated Registers
Figure 59:
Mask Main Interrupt Register
Address# 08h : Mask Main Interrupt
Bit
7
Name
M_pu
Default
Function
Comments
1
Mask power-up IRQ
This bit is set to ‘0’ during
power-up initialization in case
EEPROM configuration bit irq_
pu is set to ‘1’
This bit is set to ‘0’ during
power-up initialization in case
EEPROM configuration bit irq_
l4 is set to ‘1’
6
M_wu_l4
1
Mask wake-up IRQ at entry in
ACTIVE(*) state
5
M_wu
0
Mask wake-up IRQ triggered
by sending Wake-Up
command
4
M_rxs
0
Mask IRQ due to start of
receive
3
M_rxe
0
Mask IRQ due to end of
receive
2
M_txe
0
Mask IRQ due to end of
transmission
1
M_wl
0
Mask IRQ due to FIFO water
level
0
RFU
0
Type: RW
Note(s):
1. Default setting is set at power-up and after Set Default command.
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AS3953B − Application Information
Figure 60:
Mask Auxiliary Interrupt Register
Address# 09h : Mask Auxiliary Interrupt
Bit
Name
Default
Function
7
M_des
0
Mask IRQ due to reception of
DESELECT command
6
M_er_fr
0
Mask Framing error IRQ
5
M_er_par
0
Mask Parity error IRQ
4
M_er_crc
0
Mask CRC error IRQ
3
M_er_fifo
0
Mask FIFO error IRQ
2
M_eew
0
Mask IRQ due to successful
termination of EEPROM
programming
1
M_er_eew
0
Mask error during EEPROM
programming IRQ
0
M_ee_spi
0
Mask IRQ due to interruption
of EEPROM access due to PICC
interface activation
Type: RW
Comments
Note(s):
1. Default setting is set at power-up and after Set Default command.
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AS3953B − Application Information
Figure 61:
Main Interrupt Register
Address# 0Ah : Main Interrupt
Function
Type: R
Bit
Name
Comments
7
I_pu
6
I_wu_l4
5
I_wu
Wake-up IRQ triggered by sending
Wake-Up command
4
I_rxs
IRQ due to start of receive
Applicable when receive frame is
put in FIFO
3
I_rxe
IRQ due to end of receive
Applicable when receive frame is
put in FIFO
2
I_txe
IRQ due to end of transmission
Applicable when data from FIFO is
sent
During receive informing that
FIFO is almost full and has to be
read out.
During transmit informing that
FIFO is almost empty and that
additional data has to be send
Power-up IRQ
Wake-up IRQ at entry in ACTIVE(*) state
1
I_wl
IRQ due to FIFO water level
0
I_aux
IRQ due to event displayed in the
Auxiliary Interrupt Register
Note(s):
1. At power-up and after Set Default command, content of this register is set to ‘0’.
2. After Main Interrupt Register is read, with the exception of bit0, the register content is set to ‘0’. The bit0 is set to ‘0’ only after the
corresponding interrupt register is read.
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AS3953B − Application Information
Figure 62:
Auxiliary Interrupt Register
Address# 0Bh : Auxiliary Interrupt
Type: R
Bit
Name
Function
Comments
7
I_des
IRQ due to reception of DESELECT
command
6
I_er_fr
Framing error
5
I_er_par
Parity error
4
I_er_crc
CRC error
In case of parity or/and CRC error
the receive data is still put in FIFO,
error IRQ is additionally send.
3
I_er_fifo
FIFO error (overflow/underflow)
See FIFO Status Register 2
2
I_eew
IRQ due to successful termination of
EEPROM programming
In case EEPROM write command
was sent through SPI
1
I_er_eew
Error during EEPROM programming
(writing to write protected word,
writing to nonexistent address)
In case EEPROM write command
was sent through SPI
0
I_ee_spi
IRQ due to interruption of EEPROM
access due to PICC interface activation
Note(s):
1. At power-up and after Set Default command content of this register is set to 0.
2. After Auxiliary Interrupt Register has been read its content is set to 0.
Figure 63:
FIFO Status Register 1
Address# 0Ch : FIFO Status 1
Bit
Name
Function
7
RFU
6
RFU
5
fifo_b5
4
fifo_b4
3
fifo_b3
2
fifo_b2
1
fifo_b1
0
fifo_b0
Type: R
Number of data bytes (binary coded) in
the FIFO which were not read out
Comments
Valid range is from 000000 to
100000
000000 means that there are no
data bytes to be read out
Note(s):
1. At power-up and after direct commands Set Default and Clear content of this register is set to 0.
ams Datasheet
[v1-04] 2016-Jan-07
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AS3953B − Application Information
Figure 64:
FIFO Status Register 2
Address# 0Dh: FIFO Status 2
Bit
Name
7
Type: R
Function
Comments
RFU
Set when more bytes than the
actual content of FIFO are read
6
fifo_unf
FIFO underflow
5
fifo_ovr
FIFO overflow
4
fifo_ncp
Last FIFO byte is not complete
3
fifo_lb2
2
fifo_lb1
1
fifo_lb0
0
np_lb
Number of bits in last FIFO byte in case
it was not complete (fifo_npc=1)
MSB bits valid
Parity bit is missing in last byte
This is a framing error
Note(s):
1. At power-up and after direct commands Set Default and Clear content of this register is set to 0.
Definition of Number of Transmitted Bytes
Figure 65:
Number of Transmitted Bytes Register 1
Address# 10h : Number of Transmitted Bytes 1
Bit
Name
7
RFU
6
RFU
5
RFU
4
Type: RW
Default
Function
Comments
ntx9
0
3
ntx8
0
Number of full bytes to be
transmitted in one
command, MSB bits
Maximum supported number of
bytes is 1023
2
ntx7
0
1
ntx6
0
0
ntx5
0
Note(s):
1. Default setting is set at power-up and after Set Default command.
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AS3953B − Application Information
Figure 66:
Number of Transmitted Bytes Register 2
Address# 11h: Number of Transmitted Bytes 2
Bit
Name
Default
7
ntx4
0
6
ntx3
0
5
ntx2
0
4
ntx1
0
3
ntx0
0
2
nbtx2
1
nbtx1
0
nbtx0
Function
Type: RW
Comments
Number of full bytes to be
transmitted in one
command, LSB bits
Maximum supported number of
bytes is 1023
Number of bits in the split
byte 000 means that all
bytes all full
Applicable in Level-3 Protocol
mode in case configuration bit
txbs is set (bit stream Tx)
Framing mode
Note(s):
1. Default setting is set at power-up and after Set Default command.
ams Datasheet
[v1-04] 2016-Jan-07
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AS3953B − Package Drawings & Markings
Package Drawings & Markings
Figure 67:
Thin WL-CSP 10-Bumps Package Diagram
RoHS
Green
Note(s):
1. Pin1=A1.
2. ccc coplanarity.
3. All dimensions are in μm.
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AS3953B − Package Drawings & Markings
Figure 68:
Package Marking
AS3953B
XXXX
Figure 69:
Package Code
XXXX
Tracecode
ams Datasheet
[v1-04] 2016-Jan-07
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AS3953B − Ordering & Contact Information
Ordering & Contact Information
The devices are available as standard products shown in figure
below.
Figure 70:
Ordering Information
Ordering Code
Package
Marking
Delivery Form
Delivery Quantity
AS3953B-BTWM
Thin WL-CSP
AS3953B
Mini Reel
1000 pcs/reel
AS3953B-BTWT
Thin WL-CSP
AS3953B
Tape & Reel
12000 pcs/reel
AS3953B-BSWB
Sorted Wafer
NA
Wafer Box
Buy our products or get free samples online at:
www.ams.com/ICdirect
Technical Support is available at:
www.ams.com/Technical-Support
Provide feedback about this document at:
www.ams.com/Document-Feedback
For further information and requests, e-mail us at:
[email protected]
For sales offices, distributors and representatives, please visit:
www.ams.com/contact
Headquarters
ams AG
Tobelbaderstrasse 30
8141 Unterpremstaetten
Austria, Europe
Tel: +43 (0) 3136 500 0
Website: www.ams.com
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AS3953B − RoHS Compliant & ams Green Statement
RoHS Compliant & ams Green
Statement
RoHS: The term RoHS compliant means that ams AG products
fully comply with current RoHS directives. Our semiconductor
products do not contain any chemicals for all 6 substance
categories, including the requirement that lead not exceed
0.1% by weight in homogeneous materials. Where designed to
be soldered at high temperatures, RoHS compliant products are
suitable for use in specified lead-free processes.
ams Green (RoHS compliant and no Sb/Br): ams Green
defines that in addition to RoHS compliance, our products are
free of Bromine (Br) and Antimony (Sb) based flame retardants
(Br or Sb do not exceed 0.1% by weight in homogeneous
material).
Important Information: The information provided in this
statement represents ams AG knowledge and belief as of the
date that it is provided. ams AG bases its knowledge and belief
on information provided by third parties, and makes no
representation or warranty as to the accuracy of such
information. Efforts are underway to better integrate
information from third parties. ams AG has taken and continues
to take reasonable steps to provide representative and accurate
information but may not have conducted destructive testing or
chemical analysis on incoming materials and chemicals. ams AG
and ams AG suppliers consider certain information to be
proprietary, and thus CAS numbers and other limited
information may not be available for release.
ams Datasheet
[v1-04] 2016-Jan-07
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AS3953B − Copyrights & Disclaimer
Copyrights & Disclaimer
Copyright ams AG, Tobelbader Strasse 30, 8141
Unterpremstaetten, Austria-Europe. Trademarks Registered. All
rights reserved. The material herein may not be reproduced,
adapted, merged, translated, stored, or used without the prior
written consent of the copyright owner.
Devices sold by ams AG are covered by the warranty and patent
indemnification provisions appearing in its General Terms of
Trade. ams AG makes no warranty, express, statutory, implied,
or by description regarding the information set forth herein.
ams AG reserves the right to change specifications and prices
at any time and without notice. Therefore, prior to designing
this product into a system, it is necessary to check with ams AG
for current information. This product is intended for use in
commercial applications. Applications requiring extended
temperature range, unusual environmental requirements, or
high reliability applications, such as military, medical
life-support or life-sustaining equipment are specifically not
recommended without additional processing by ams AG for
each application. This product is provided by ams AG “AS IS”
and any express or implied warranties, including, but not
limited to the implied warranties of merchantability and fitness
for a particular purpose are disclaimed.
ams AG shall not be liable to recipient or any third party for any
damages, including but not limited to personal injury, property
damage, loss of profits, loss of use, interruption of business or
indirect, special, incidental or consequential damages, of any
kind, in connection with or arising out of the furnishing,
performance or use of the technical data herein. No obligation
or liability to recipient or any third party shall arise or flow out
of ams AG rendering of technical or other services.
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AS3953B − Document Status
Document Status
Document Status
Product Preview
Preliminary Datasheet
Datasheet
Datasheet (discontinued)
ams Datasheet
[v1-04] 2016-Jan-07
Product Status
Definition
Pre-Development
Information in this datasheet is based on product ideas in
the planning phase of development. All specifications are
design goals without any warranty and are subject to
change without notice
Pre-Production
Information in this datasheet is based on products in the
design, validation or qualification phase of development.
The performance and parameters shown in this document
are preliminary without any warranty and are subject to
change without notice
Production
Information in this datasheet is based on products in
ramp-up to full production or full production which
conform to specifications in accordance with the terms of
ams AG standard warranty as given in the General Terms of
Trade
Discontinued
Information in this datasheet is based on products which
conform to specifications in accordance with the terms of
ams AG standard warranty as given in the General Terms of
Trade, but these products have been superseded and
should not be used for new designs
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AS3953B − Revision Information
Revision Information
Changes from 1.1 to current revision 1-04 (2016-Jan-07)
Page
1.1 to 1-02 (2015-Nov-20)
Content was updated to the latest ams design
Added benefits to the Key Features
2
Updated Figure 4
4
Updated Figure 9
8
Added Package Drawings & Markings section
56
Updated Figure 68
58
1-02 (2015-Nov-20) to 1-03 (2015-Nov-24)
Updated Figure 5
5
Updated text under Figure 33
24
Updated text under ISO 14443A Level-3 Protocol Mode
25
1-03 (2015-Nov-24) to 1-04 (2016-Jan-07)
Updated Figure 67
56
Note(s):
1. Page and figure numbers for the previous version may differ from page and figure numbers in the current revision.
2. Correction of typographical errors is not explicitly mentioned.
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AS3953B − Content Guide
Content Guide
1
2
3
3
General Description
Key Benefits & Features
Applications
Block Diagram
4
5
Pin Assignment
Absolute Maximum Ratings
6
6
8
Electrical Characteristics
DC/AC Characteristics for Digital Inputs and Outputs
Electrical Specification
9
9
10
12
13
13
14
15
15
19
23
24
25
25
26
26
26
26
29
29
29
Detailed Description
Circuit
PICC AFE
Power Manager
ISO 14443A Framing Mode
ISO 14443A Level-4 Protocol Mode
Coding of UID
Coding of ATQA, SAK and ATS
ATQA
Proprietary Commands
Passing of Block Data to Controller
Use of CID
ISO 14443A Level-3 Protocol Mode
Transparent Mode
EEPROM
UID Word
Fabrication Data Word
Configuration Word
OTP Words
Write Lock Word
Read Lock Word
30
30
32
Application Information
SPI Interface
Writing of Data to Addressable Registers
(Register Write Mode)
Reading of Data from Addressable Registers
(Register Read Mode)
Writing and Reading of EEPROM Through SPI
Loading Transmitting Data into FIFO
Reading Received Data from FIFO
Direct Command Mode
SPI Timing
Interrupt Interface
FIFO Water Level and FIFO Status Register
ISO 14443A Frame Data in FIFO
Direct Commands
Set Default
Clear
Transmit
Go2halt
Registers
33
34
36
36
37
38
40
40
42
42
42
42
43
43
43
ams Datasheet
[v1-04] 2016-Jan-07
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AS3953B − Content Guide
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44
45
46
48
50
54
Overview of Registers
IO Definition Register
Mode Definition Registers
Display Registers
Interrupt Register and Associated Registers
Definition of Number of Transmitted Bytes
56
58
59
60
61
62
Package Drawings & Markings
Ordering & Contact Information
RoHS Compliant & ams Green Statement
Copyrights & Disclaimer
Document Status
Revision Information
ams Datasheet
[v1-04] 2016-Jan-07