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PDF AS3931 Data sheet ( Hoja de datos )
| Número de pieza | AS3931 | |
| Descripción | 3D Low Power Wake-up Receiver | |
| Fabricantes | austriamicrosystems AG | |
| Logotipo |  |
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Datasheet
AS3931
3D Low Power Wakeup Receiver
1 General Description
The AS3931 is an ultra low power, three channel LF ASK receiver
designed to operate in various applications such as LF identifications
systems and LF tag receivers. AS3931 detects a low frequency
ASK-modulated signal by looking for a digital wakeup pattern and
generates a WAKE signal after successful pattern detection. The
device incorporates an intelligent pattern detection algorithm that
provides reliable operation in presence of strong interference. An
RSSI signal can be generated at the RSSI pin for each receiver
channel.
The product is available in 16-pin TSSOP package.
The AS3931 contains:
Antenna rotation switch
Three independent LF receiver chains
Wakeup output combining the three receiver chains
Low power 32.768kHz crystal oscillator circuit
Serial programming interface
Voltage regulator with 2.4V output, on/off switchable
Each independent LF receiver chain contains:
Input overload protection
Input attenuator
Ultra low power LF amplifier with logarithmic envelope output
Robust data detector with adaptive slicing threshold that
translates the logarithmic envelope into a digital data signal.
Error tolerant digital pattern correlator that detects a given code
sequences in the received data signal and generates a wakeup
signal.
Sophisticated power management logic that powers down the
correlator if no data is received.
2 Key Features
Programmable Serial Data Interface
Flexible carrier frequencies
Three axis wakeup pattern detection
Three axis LF field strength measurement
Antenna rotation for easy calibration
High sensitivity and high dynamic range
Wide operating frequency range
Reliable, interference resistant wakeup decoding
Highly protected differential inputs
Ultra low power consumption
Automotive qualified
16-pin TSSOP package
3 Applications
The device is ideal for LF identification systems, LF tag receivers,
three dimensional LF field strength measurement systems, and Ultra
low power wake up systems.
Figure 1. Typical Application Diagram
VCC
Transmitting
Antenna
CBAT
VCC
LF1N
LF1P
LF2N
LF2P
LF3N
LF3P
GND
RP
VREG
RSSI
SDA
SCL
CS
WAKE
XOUT
XIN
XTAL
CA
CREG
RSSI
DATA
CLOCK
CHIP SEL
WAKE
CB
www.austriamicrosystems.com/AS3931
Revision 6.2
1 - 30
1 page  
AS3931
Datasheet - Absolute Maximum Ratings
5 Absolute Maximum Ratings
Stresses beyond those listed in Table 2 may cause permanent damage to the device. These are stress ratings only. Functional operation of the
device at these or any other conditions beyond those indicated in Section 6 Electrical Characteristics on page 6 is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Table 2. Absolute Maximum Ratings
Parameter
Min Max Units
Notes
Positive supply voltage
(VCC)
-0.5 5.5
V
Analog ground
(GND)
00V
Voltage at any pin except pin 2 to pin 7 (VIN)
Voltage at Pin 2 to Pin 7
(VIN)
GND-0.5
GND-0.5
VCC+0.5
GND+0.5
V
V
Input current (Latchup Immunity)
(Iin)
Electrostatic discharge
(VESD)
Total power dissipation
(Ptot)
-100 +100
mA
1000 V
300 mW
JEDEC 78
Norm: MIL 883 E method 3015
HBM: R=1.5 kΩ, C=100 pF
Storage temperature
(Tstg)
-55 125 ºC
Package body temperature
(Tbody)
The reflow peak soldering temperature (body
temperature) specified is in accordance with IPC/
JEDEC J-STD-020 “Moisture/Reflow Sensitivity
+260 ºC Classification for Non-Hermetic Solid State
Surface Mount Devices”.
The lead finish for Pb-free leaded packages is
matte tin (100% Sn).
Humidity non-condensing
5 85 %
Moisture Sensitive Level
3
Represents a maximum floor life time of 168h
Operating Ambient Temperature Range
(TAMB)
-20
+65
ºC
Recommended Operating Conditions
Positive supply voltage
(VCC)
2.6 5.5
V
Regulator used
Positive supply voltage
(VCC)
2.4 3.5
V
Regulator not used
Analog Ground
(GND)
00V
www.austriamicrosystems.com/AS3931
Revision 6.2
5 - 30
5 Page 
AS3931
Datasheet - Typical Operating Characteristics
7.3 Supply Voltage Dependence of RSSI
Figure 8. RSSI-step [V] @ Vin = 1 mVpp and 2 mV
vs. VCC [V]
410m
390m
370m
350m
330m
310m
290m
270m
250m 2.40 2.60 2.80 3.00 3.20 3.40 3.60
Figure 9. RSSI-step [V] @ Vin = 300 µVpp and offset
vs. VCC [V]
87.0m
83.0m
79.0m
75.0m
71.0m
67.0m
2.00m
1.80m
1.60m
1.40m
1.20m
1.00m
800m
2.40 2.60 2.80 3.00 3.20 3.40 3.60
Figure 10. RSSI-step [V] @ Vin = 1 mVpp and 2 mV vs
VCC [V], reduced stepvs. VCC [V], reduced step
280m
260m
240m
220m
200m
180m
160m
2.40 2.60 2.80 3.00 3.20 3.40 3.60
Figure 11. RSSI-step [V] @ Vin =300 µVpp and offset
57.0m
55.0m
53.0m
51.0m
49.0m
47.0m
45.0m
43.0m
2.10
1.90
1.70
1.50
1.30
1.10
900m 2.40
2.60
2.80
3.00
3.20
3.40
3.60
www.austriamicrosystems.com/AS3931
Revision 6.2
11 - 30
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| PDF Descargar | [ Datasheet AS3931.PDF ] | |
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