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PDF AS3955 Data sheet ( Hoja de datos )
| Número de pieza | AS3955 | |
| Descripción | NFC Forum Compliant Dynamic Tag | |
| Fabricantes | ams | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AS3955 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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General Description
AS3955
NFC Forum Compliant Dynamic Tag
AS3955 NFC Dynamic Tag IC is the ultimate solution to easily
add NFC functionality to electronic devices. Thanks to a high
sensitivity ISO14443A frontend and high integrated resonance
capacitor, AS3955 offers standalone NFC passive tag
functionality in a small footprint. Fast system integration and
high speed data transfer are guaranteed by the available SPI
and I²C interfaces and by the optimized protocols (Tunneling
Mode and Extended Mode), allowing bidirectional
communication between the device microcontroller and an
external NFC compliant device or ISO14443A reader device
(PCD).
AS3955 is able to operate fully powered by the RF field, without
any external supply. This, combined with an advanced energy
harvesting feature, greatly increases battery life time or even
allows battery-less designs.
AS3955 is used with an appropriate antenna coil connected to
the terminals LC1 and LC2, and behaves as a standard passive
ISO 14443A tag (PICC). After the anti-collision protocol stage,
based on configuration, AS3955 can operate as a standalone
NFC Forum Type 2 Tag or, when tunneling mode is activated, as
a bridge between the PCD and the microcontroller, e.g. to
emulate a custom or standard ISO14443A Level 3 or Level 4 PICC
or a NFC Forum tag. A configurable wake-up signal notifies the
microcontroller on ongoing RF activities, in order to minimize
overall power consumption.
AS3955 includes an embedded EEPROM memory that can be
accessed from the PCD through the RF link or from the
microcontroller through the SPI or I²C interfaces. Part or all
memory can be protected by a 32-bit password, or permanently
locked.
AS3955 supports ISO 14443A up to Level 4 and is designed
according to EMVCo requirements, to enable the emulation of
contactless smart cards or NFC Forum compliant Type 2 or Type
4 Tags.
AS3955 is designed for high reliability, and can operate in a wide
power supply range from 1.65V to 5.5V, in a wide temperature
range from -40 °C to 125 °C. EEPROM memory reaches
automotive grade quality with endurance of 100,000 cycles and
data retention of 10 years at 125 °C.
Ordering Information and Content Guide appear at end of
datasheet.
ams Datasheet
[v1-01] 2015-Apr-29
Page 1
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AS3955 − General Description
AS3955 is composed of NFC-A Analog Front End (AFE), NFC Type
2 Tag Logic, EEPROM, SPI / I²C Interface and Power Supply
Manager Block (Power Manager).
The AFE is connected to an external tag coil which forms,
together with integrated resonant capacitor, a LC tank
resonating with the external electromagnetic field frequency
of 13.56 MHz. The AFE has built-in rectifier and regulators. The
output of the internal regulator (VP_INT) is used to supply the
AFE and also the Logic and EEPROM (through Power Supply
Manager). A regulator output VP_REG is available on a pin to
supply external circuitry by harvesting energy from the RF field.
The Power Manager is controlling the power supply of Logic
and EEPROM. The two blocks can be supplied either from
VP_INT or from VP_IO (SPI / I²C power supply) depending on
the power mode of the chip. AS3955 offers a power mode where
VP_IO supply is switched to VP_INT whenever the RF field is
present. VP_IO is typically used when some activity is started
over the SPI / I²C and the VP_INT is too low to be used as a power
supply.
The Logic is responsible for handling the anti-collision
sequence, when acting as NFC Type 2 Tag, and other data
transfer. The interface logic contains also a 32-byte buffer for
block transmission between NFC device and AS3955.
The EEPROM is used to store the UID, configuration and control
bits, and user data which can be accessed also via the SPI / I²C.
ams Datasheet
[v1-01] 2015-Apr-29
Page 5
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AS3955 − Electrical Characteristics
Figure 11:
EEPROM Endurance Over Temperature
2,500,000
Endurance EEPROM
2,000,000
1,500,000
1,000,000
500,000
0
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130
Temperature [°C]
Figure 12:
EEPROM Data Retention Over Temperature
10,000
1,000
100
10
1
0
25
Data retention EEPROM
50 75 100 125 150
Temperature [°C]
ams Datasheet
[v1-01] 2015-Apr-29
Page 11
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11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AS3955.PDF ] | |
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