AS3980
UHF RFID Single Chip Reader EPC
Class1 Gen2
General Description
The AS3980 is an UHF RFID reader IC enabling battery-powered,
small form-factor handheld and embedded UHF reader systems
for a single tag environment of EPC Class1 Gen2 compliant UHF
RFID tags. The device directly supports ISO 18000-6C/ EPC
Class1 Gen2 transponders in a single-tag environment. The
AS3980 operates at very low power, which means that this
advanced RFID reader IC is suitable for use in portable and
battery-powered equipment such as mobile phones. AS3980
requires only an external simple 8-bit
μC
to create a complete
RFID reader system. AS3980 is highly integrated and
implements the RFID functions on chip thus eliminating a need
for a complex RFID co-processor. Packaged in a 7 x 7 mm QFN
outline, the IC benefits from fabrication process technology
unique to ams AG to deliver very high sensitivity and providing
high immunity to the effects of antenna reflections and
self-jamming. This is critical in mobile and embedded
applications, in which antenna design is often compromised by
cost or size constraints. High sensitivity enables end-product
designs to achieve their required read range while using a
simpler and cheaper antenna, thus reducing system
bill-of-materials cost.
Ordering Information
and
Content Guide
appear at end of
datasheet.
Key Benefits & Features
The benefits and features of AS3980, UHF RFID Single Chip
Reader EPC Class1 Gen2 are listed below:
Figure 1:
Added value of using AS3980
Benefit
Optimized for battery operation
ISO 18000-6C implemented in HW.
Low coding effort and MCU requirements
High PSRR
Flexible modulation method
Small package footprint – saving PCB area
Feature
Supply voltage range: 3.0V to 3.6V:
• Limited operation possible down to 2.7V
• Peripheral I/O supply range: 1.65V to 5.5
Basic protocol support for ISO 18000-6C (EPC Class1 Gen2):
• Reception mode M8 on 40kHz link frequency
Integrated supply regulators
ASK or PR-ASK modulation
48-pin QFN (7x7x0.9 mm) package
ams Datasheet, Confidential: 2014-Apr-29 [v2-00]
AS3980 – 1
General Description
Benefit
Avoidance of communication holes
Tag movement detection support
Wide temperature range
Automatic I/Q selection
Feature
Phase bit for tag tracking with 8-bit linear RSSI
-40ºC to 85ºC
Applications
The AS3980 device is well suited for:
• Embedded consumer/industrial applications with cost
constraints such as beverage dispensing.
• Hand-held readers.
• Mobile UHF RFID readers.
• Battery-powered stationary readers.
• FMCG and brand protection
• Product authentication
Block Diagram
The functional blocks of this device for reference are
shown below:
Figure 2:
AS3980 Block Diagram
AS3980
Analog Front-End
IQ
Mixer
MIXS_IN
RX
Filter
Gain
Amplifiers
Digitizer
I
IRQ
Q
EN
RSSI
RFOPX
PA
Balu
n
RFONX
OSCI
Oscillato
r&
Timing
System
OSCO
+3.3 V
Supply
Regulators and
References
Serial Conversion
and
CRC Parity Check
VCO /
PLL
0 dBm
Shaping
I
Q
MCU
Interface
SPI
SCLK
MOSI
MISO
NCS
Protocol & Logic
RX
Decoder Bit
Framing
TCXO
20 MHz
TX Framing
DUAL 24
Byte FIFO
Registers
AS3980 – 2
ams Datasheet, Confidential: 2014-Apr-29 [v2-00]
Pi n A s s i g n m e n t
Pin Assignment
T
he AS3980 pin assignments are described below.
Figure 3:
Pin Diagram
AS3980 Pin Assignment:
This figure
shows the pin assignment and location
viewed from top.
COMN_A
COMP_A
LF_CEXT
V
DD_IO
38
V
DD_LF
VOSC
V
DD_A
SCLK
37
AGD
ADC
39
CD1
41
CD2
40
48
47
46
45
44
43
COMP_B
COMN_B
V
DD_LFI
NC
MIXS_IN
NC
V
DD_TXPAB
CBV
CBIB
V
DD_MIX
V
EXT
V
DD_B
42
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
49 (exposed pad)
36
35
34
33
32
AS3980
31
30
29
28
27
26
25
CLSYS
MOSI
MISO
NCS
IRQ
EN
OSCO
OSCI
V
DD_D
OAD
OAD2
VSN
NC
NC
NC
V
DD_RF
V
EXT_RF
VSN
VSN
VSN
NC
VSN
Figure 4:
Pin Description
Pin Number
Pin Name
48-pin QFN
1
2
3
4
5
6
7
8
9
10
COMP_B
COMN_B
V
DD_LFI
NC
MIXS_IN
NC
V
DD_TXPAB
CBV
CBIB
V
DD_MIX
Supply pad
Analog I/O
Analog I/O
Analog I/O
Analog input
Analog I/O
Analog I/O
Supply pad
Internal node, connect de-coupling capacitor to V
DD_LFI
Internal node, connect de-coupling capacitor to V
DD_LFI
Positive supply for LF input stage, connect to V
DD_MIX
Not connected
Single ended mixer input
Not connected
Bias positive supply. Connect to V
DD_MIX
Internal node, connect de-coupling capacitor to V
DD_MIX
Internal node, connect de-coupling capacitor to ground
Mixer positive supply, internally regulated
Pin Type
Description
ams Datasheet, Confidential: 2014-Apr-29 [v2-00]
RFONX
RFOPX
AS3980 – 3
Pin Assignment
Pin Number
Pin Name
48-pin QFN
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
V
EXT
V
DD_B
V
DD_RF
V
EXT_RF
VSN
NC
NC
VSN
VSN
NC
NC
VSN
RFONX
RFOPX
VSN
OAD2
OAD
V
DD_D
OSCI
OSCO
EN
IRQ
NCS
MISO
MOSI
CLSYS
SCLK
Supply pad
Analog output
Analog output
Supply pad
Analog I/O
Analog I/O
Analog I/O
Analog input
Analog I/O
Digital input
Digital output
Digital input
Digital output
/ tri-state
Digital input
Digital output
Digital input
Supply pad
Supply pad
Supply pad
Analog I/O
Analog I/O
Supply pad
Supply pad
Main positive supply input, input to regulators
Buffer positive supply, internally regulated
RF positive supply, internally regulated
RF positive supply regulator input
Negative supply
Not connected
Not connected
Negative supply
Negative supply
Not connected
Not connected
Negative supply
Low power linear negative RF output (~0dBm)
Low power linear positive RF output (~0dBm)
Negative supply
Analog or digital received signal output
Analog or digital received signal output
Positive supply for logic, internally regulated
Crystal oscillator input or short to ground in case external
TCXO is used
Crystal oscillator output or external 20MHz clock input
Enable input
Interrupt request output
Serial Peripheral Interface Enable (active low)
Serial Peripheral Interface DATA output
Serial Peripheral Interface DATA input
Clock Output for MCU
Serial Peripheral Interface Clock
Pin Type
Description
AS3980 – 4
ams Datasheet, Confidential: 2014-Apr-29 [v2-00]
Pi n A s s i g n m e n t
Pin Number
Pin Name
48-pin QFN
38
39
40
41
42
43
44
45
46
47
48
49
V
DD_IO
ADC
CD2
CD1
AGD
VOSC
V
DD_A
LF_CEXT
V
DD_LF
COMP_A
COMN_A
Exposed Pad
Supply pad
Analog input
Analog I/O
Analog I/O
Analog I/O
Analog I/O
Analog I/O
Analog output
Analog I/O
Analog I/O
Analog I/O
Supply pad
Positive supply for peripheral communication, connect to
host positive supply
ADC input for external power detector support
Internal node de-coupling capacitor
Internal node de-coupling capacitor
Analog reference voltage
Internal node de-coupling capacitor
Analog part positive supply, internally regulated
PLL Loop filter
Positive supply for LF processing, internally regulated
Internal node, connect de-coupling capacitor to V
DD_LFI
Internal node, connect de-coupling capacitor to V
DD_LFI
Exposed pad of the package
Pin Type
Description
ams Datasheet, Confidential: 2014-Apr-29 [v2-00]
AS3980 – 5
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