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PDF AS3911B Data sheet ( Hoja de datos )
| Número de pieza | AS3911B | |
| Descripción | NFC Initiator / HF Reader IC | |
| Fabricantes | ams | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AS3911B (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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General Description
AS3911B
NFC Initiator / HF Reader IC
The AS3911B is a highly integrated NFC Initiator / HF Reader IC.
It includes the analog front end (AFE) and a highly integrated
data framing system for ISO 18092 (NFCIP-1) initiator, ISO 18092
(NFCIP-1) active target, ISO 14443 A and B reader (including
high bit rates) and FeliCa™ reader. Implementation of other
standard and custom protocols like MIFARE™ Classic1 is possible
through using the AFE and implementing framing in the
external microcontroller (Stream and Transparent modes).
Compared with concurrent NFC devices designed with the
mobile phone in mind, the AS3911B is positioned perfectly for
the infrastructure side of the NFC system, where users need
optimal RF performance and flexibility combined with low
power.
With ams’ unique Automatic Antenna Tuning technology, the
device is optimized for applications with directly driven
antennas. The AS3911B is alone in the domain of HF Reader ICs
in that it contains two differential low impedance (1Ω) antenna
drivers.
The AS3911B includes several features, which make it
incomparable for low power applications. It contains a low
power capacitive sensor, which can be used to detect the
presence of a card without switching on the reader field.
Additionally, the presence of a card can also be detected by
performing a measurement of amplitude or phase of signal on
antenna LC tank and comparing it to stored reference. It also
contains a low power RC oscillator and wake-up timer, which
can be used to wake the system after a defined time period and
check for the presence of a tag using one or more techniques
of low power detection of card presence (capacitive, phase or
amplitude).
The AS3911B is designed to operate from a wide power supply
range from 2.4 V to 5.5 V; peripheral interface IO pins support
power supply range from 1.65 V to 5.5 V.
Ordering Information and Content Guide appear at end of
datasheet.
1. MIFARE™ and MIFARE™ Classic are trademarks of NXP B.V.
ams Datasheet
[v1-11] 2014-Nov-06
Page 1
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1 page  
AS3911B − Pin Assignment
Pin Number
32-pin QFN
Pin Name
Pin Type
Description
9 VSP_RF
Supply regulator output for antenna drivers
10
RFO1
Analog
output
Antenna driver output
11 RFO2
12
VSN_RF
Supply pad Ground of antenna drivers
13 TRIM1_3
14 TRIM2_3
15 TRIM1_2
16 TRIM2_2
Analog I/O Input to trim antenna resonant circuit
17 TRIM1_1
18 TRIM2_1
19 TRIM1_0
20 TRIM2_0
21 VSS Supply pad Ground, die substrate potential
22 RFI1
Analog input Receiver input
23 RFI2
24 AGD Analog I/O Analog reference voltage
25 CSI Analog input Capacitor sensor input
26
VSN_A
Supply pad Analog ground
27 IRQ
Interrupt request output
Digital output
28 MCU_CLK
Microcontroller clock output
29
MISO
Digital output
/ tristate
Serial Peripheral Interface data output
30 MOSI
Serial Peripheral Interface data input
31
SCLK
Digital input Serial Peripheral Interface clock
32 /SS
Serial Peripheral Interface enable (active low)
# VSS Exposed Pad Ground, die substract potential, connect to VSS on PCB
Pin Description: Pins in bold have different functionality in comparison to the AS3910.
ams Datasheet
[v1-11] 2014-Nov-06
Page 5
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5 Page 
AS3911B − Typical Operating Characteristics
Typical Operating
Characteristics
Thermal Resistance and Max. Power Dissipation
Figure 10:
TCASE vs. Power with different copper area @ TAMB = +25°C
TcasevsPowerQFN32withdifferentcopperarea.Tamb=25°C
100
90
80
70
60
50
40
30
20
0
0,5 1 1,5 2
PowerDissipation[W]
0x0mm
10x10mm
20x20mm
30x30mm
40x40mm
50x50mm
60x60mm
70x70mm
2,5
Figure 11:
RthCA vs. Copper Area
100
90
80
70
60
50
40
30
20
10
0
0
Rth_CA [K/W] vs Copper Area
10 20 30 40 50 60
Area [cm ^2]
ams Datasheet
[v1-11] 2014-Nov-06
Page 11
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11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AS3911B.PDF ] | |
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