Texas Instruments | TMS37157 Passive Low-Frequency Interface IC Performance With Neosid Antennas (Rev. A) | Application notes | Texas Instruments TMS37157 Passive Low-Frequency Interface IC Performance With Neosid Antennas (Rev. A) Application notes

Texas Instruments TMS37157 Passive Low-Frequency Interface IC Performance With Neosid Antennas (Rev. A) Application notes
Application Report
SWRA382A – April 2013
TMS37157 Passive Low-Frequency Interface IC
Performance With Neosid Antennas
Kostas Aslanidis and Andre Frantzke
..................................................................................................
ABSTRACT
The Texas Instruments low-frequency transponder technology provides the possibility to use the
TMS37157 (PaLFI) IC in combination with various antennas to meet application performance
requirements.
For cost optimization purposes, off the shelf antennas can be used from various coil manufacturers.
This application report describes the performance measured with the antennas available from Neosid
Pemetzrieder GmbH & Co. KG http://www.neosid.de/
Contents
1
Introduction .................................................................................................................. 2
2
TMS37157 Dual Interface IC .............................................................................................. 2
3
Test Setup ................................................................................................................... 5
4
Neosid ........................................................................................................................ 8
5
Contacts and References ................................................................................................ 12
Appendix A
ANNEX ............................................................................................................. 13
List of Figures
1
TMS37157 System Concept ............................................................................................... 3
2
TMS37157 System Block diagram
3
TMS37157 Application Example .......................................................................................... 4
4
Performance Test Set-Up .................................................................................................. 5
5
TMS37157 Internal and External Voltage Regulator ................................................................... 6
6
Voltage and Current Test Arrangement .................................................................................. 6
7
eZ430-TMS37157 EVM Reader
8
RI-RFM-007B RF Power Module ......................................................................................... 7
9
Neosid Antenna Functional Performance Summary
.......................................................................................
..........................................................................................
...................................................................
3
7
9
All trademarks are the property of their respective owners.
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1
Introduction
10
11
12
13
14
1
www.ti.com
.............................................................
PaLFI EVM Reader at 5 V USB Power Supply ........................................................................
PaLFI EVM Reader at 12 V ext. Power Supply .......................................................................
RI-RFM-007 + RI-ANT-S01C at 12 V Power Supply .................................................................
RI-RFM-007 + RI-ANT-G02E at 12 V Power Supply .................................................................
Neosid Antenna Induced Voltage/Current Performance
10
11
11
12
12
Introduction
The Texas Instruments low frequency half-duplex (HDX) transponder technology allows the possibility to
improve the communication distance and performance between the transponder and reader.
This document provides information and measurement results based on different system RF power levels
and antenna dimensions.
The type of antennas used for the tests, are off the shelf antennas from Neosid Pemetzrieder GmbH &
Co. KG (http://www.neosid.de) and some additional form factors to show the performance difference and
capabilities.
2
TMS37157 Dual Interface IC
2.1
IC Overview
The TMS37157 TI RFID transponder IC Passive Low-Frequency Interface (PaLFI) is designed to work in
the low-frequency band (134.2 kHz) and uses the HDX RFID communication protocol.
The IC provides a dual communication interface:
• One interface is used for the communication over the RF interface
• One for the communication over the SPI interface
The IC fully operates as a passive RFID transponder without any need for external power supply. For
additional functionality, the IC can be directly connected to a MSP430 microcontroller via the SPI
interface. Depending on the system parameters and antennas used on the both reader and tag side, the
PaLFI can supply external modules and components (e.g., uC, sensors, LED, etc.) with power derived
from the magnetic field over various distances. This application report shows how to define the
parameters to meet the system performance requirements.
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Figure 1 shows a top level system overview and Figure 2 illustrates a block diagram of the IC.
TX/RX
Modules
EEPROM
Connected
to MSP430
RFID
Interface
LED / Switch
Dig. / Analog
Sensor
SPI
LR
CR
AFE
Transponder
Wacke up
EEPROM
MSP430
Power mode
Vcc
CL
VBAT
BAT
CAP
RFID
Connected to
EEPROM
Figure 1. TMS37157 System Concept
TMS37157
RF
EEPROM
ROM
CRC
GEN.
ENCR.
TRP
INTF.
LR
CLKA/M
CR
VBATI
CL
VOLT.
REG.
VCL
SIMO
S
P
I
CONTROL
UNIT
VCCD
SOMI
SPI_CLK
BUSY
GND
Q CL
CLEAR
VBATI ON
S
VBAT
BATBATI
PUSH
VBAT
BAT
VBATI
CBAT
Figure 2. TMS37157 System Block diagram
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TMS37157 Dual Interface IC
2.2
Applications
•
•
•
•
•
•
•
•
2.3
www.ti.com
Medical
– Configuration of hearing aids, implants
– Batteryless operation of implants and sensors
Wireless, battery-less sensor interface
– Wireless operation of sensors attached to containers, and other objects
Configuration interface (PLC, CD/DVD Player)
– End of production line configuration of electronic devices; configuration of already packaged goods
in the warehouse
Stand alone LF RFID transponder with memory
– Works as stand alone device without microcontroller
Metering
– PaLFI in, e.g., E-meters works without battery: Counter values can be read even if battery is empty,
or remains switched off
Semi-active transponder
Wireless charging
Wireless activation and deactivation (wake-up) of remote devices
TMS37157 System Description
A typical RFID system consists basically of two main components:
• Reader
• Transponder
The proper definition and design of the transponder and reader system parameters will provide the best
possible system performance.
The TMS37157 operates as a typical RFID system, but offers additional functionality that can be executed
using the MSP430 microcontroller connected directly to the PaLFI via the SPI interface. A typical
application with an active UHF transceiver can be seen in Figure 3.
Digital or Analog
Sensor
CC1101
UHF Transceiver
CC1101
TRS202
MSP430
RS232 Driver
MSP430
TPS71299
TMS3705
LF Base Station
134,2 kHz
ENERGY
LF DATA
PaLFI
TMS37157
LF Transponder
with EEPROM
Dual LDO
Reader/Writer
Sensor System
Figure 3. TMS37157 Application Example
2.4
TMS37157 Product Collaterals and Support
http://www.ti.com/tool/ez430-tms37157
• Data Sheet and Manual
• Application Reports
• Example source code in C for all transponder functions
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Test Setup
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•
•
•
•
•
SPI library for using the TMS37157 with an MSP430
Reader/writer base station source code in C
GUI
Recommended application circuit
Antenna design support
Further information can be found at:
• http://www.ti.com/product/tms37157
• http://www.ti.com/product/tms3705
• http://focus.ti.com/wireless/docs/wirelessoverview.tsp?familyId=2003&sectionld=646&tabId=2
735
• http://www.ti.com/product/msp430f2274
• 80mA, 10V, 3.2μA Quiescent Current Low-Dropout Linear Regulator in SC70 or SON 2x2 Data Sheet
(SBVS116)
• http://www.ti.com/product/ri-rfm-007b
• http://focus.ti.com/paramsearch/docs/parametricsearch.tsp?family=rfid&sectionId=475&tabId=2104&fa
milyId=1354&paramCriteria=no
3
Test Setup
3.1
Test Setup
A simple test set-up can be used to measure the system performance (voltage and current) over distance.
PC
TI EVM /
GUI
Reader
A
N
T
E
N
N
A
Distance
Volt /
Current
meter
PaLFI Board
and Antenna
Figure 4. Performance Test Set-Up
3.2
Voltage Regulator
For applications where a current up to 4 mA is required, the internal regulator can be used as described in
the product documents.
For applications where a higher current is required, an external voltage regulator is recommended. As an
example, the TPS71433 can be used. For more information, see the 80mA, 10V, 3.2μA Quiescent Current
Low-Dropout Linear Regulator in SC70 or SON 2x2 Data Sheet (SBVS116).
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Test Setup
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P3.1_UCB0SMO 10
P3.2
P3.3
AVSS
AVCC
P4.0
P4.1
P4.2
P4.3
P4.4
P4.5
P3.1
P4.0
P4.1
P4.2
RF1
TCLK
TDAT
TEN
470p/NPO/2%
P1.3
MOSFET-NCH_SOT-23
C11
Antenna
R11
1M
GND GND
10M
C14
10uF
SPI_SIMO
SPI_SOMI
PAD SPI_CLK
CLKA_M
12
11
10
9
GND
Int: Internal regutator used (VBAT)
EOBA
NPOR
PUSH
BUSY
C12
220nF
C13
100nF
GND GND
VCL
GND
VBAT
VBAT1
1
2
3
4
TCLK
TDAT
TEN
L1
GND
I2C
TMS37157
GND
R1
VCC_BAT
current mesasurement
16
15
14
13
n3
GND
C5
na
RF1
Output Voltage
(2.1V/3V)
5
C6
VCL
1K
Q1
5
6
7
8
82 4143_MINIMELF
N
OUT
GND
R3
P4.5
JP1
1
2
4
2
GND
21
GND
11
12
13
14
15
16
17
18
19
20
P3.1_UCB0SOMI
P3.1_UCB0CLK
U4
TPS71433
Ext: External voltage regulator
TPS71xxx connected to VCL
P4.5
GND
Figure 5. TMS37157 Internal and External Voltage Regulator
3.3
Measurement Set-Up
A variable resistor is used to simulate the load on the output.
At a certain distance between the reader and the PaLFI board, the resistor value at the output is changed
until the desired voltage has been reached. At that position and resistor setting, the current through the
resistor can be recorded. The same circuit and test procedure can be used to measure the induced
voltage and current in both cases using an external or the internal voltage regulator.
5
R7
IN
OUT
GND
Device/
Sensor
100k
4
2
GND
R4
100k
TPS71433
P4.
P4.
P4.
U1
CL4148_MINIMELF
This measurement has to be repeated for different distances and antenna/power combination.
GND
IC2
TMS37157
GND
R11
1M
GND
TCLK
TDAT
1
2
3
4
100nF
10uF
RF1
TCLK
TDAT
I
U
GND
R
VCL
GND
VBAT
VBATI
220nF
C14
GND GND
GND
C12
C13
16
15
14
13
GND
10M
GND
R1
VCC BAT
SPI_SIMO
SPI_SOMI
PAD SPI_CLK
12
11
10
Figure 6. Voltage and Current Test Arrangement
3.4
eZ430 TMS37157 5 V Power Supply Over USB
The reader module is supplied only with 5 V from the USB. The detailed description can be found in the
device-specific user’s guide.
6
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Test Setup
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Figure 7. eZ430-TMS37157 EVM Reader
3.5
eZ430 TMS37157 12 V External Power Supply
The Reader module is connected to the PC via USB, but is supplied with 5 V-12 V from an external power
source. In this case, remove the 0-Ω resistors from the R34 position and solder the same resistor on
position R35.
The detailed description can be found in the device-specific user’s guide.
3.6
eZ430 TMS37157 High Power Reader Module (RI-RFM-007B)
This option describes an easy way to get fast access to a high power reader. The TI RI-RFM-007B high
power module can be used in combination with the PaLFI EVM reader. In that case the PaLFI EVM reader
module will be used as the controller to control the RF power module. Small modifications on the EVM
HW and a FW update will be needed. For modifications of the EVM module, see Section A.4.
You can choose the reader antenna dimensions to be used. TI does offer a portfolio on reader antennas
for high power readers, but you can design your own antenna, too.
Neosid does have experience on antenna design and will support the design activities.
For volume production, the RI-RFM-007B can be used with any other control module supporting the PaLFI
functionality.
Figure 8. RI-RFM-007B RF Power Module
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Neosid
4
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Neosid
Neosid is a company specialized in antenna production and design. The company has many years of
experience on RFID antenna design and already offers standard antennas for the PaLFI device.
Neosid provides design support forPaLFI antennas and also offers low-volume samples for test purposes.
4.1
Neosid Antenna Specification
The specification and data sheets of the antennas used for the measurements and additional form factors
can be found in the ANNEX 1 Neosid Antenna Specification or at:
http://www.neosid.de/produkte/induktivitaeten/transponderspulen/.
4.2
Neosid Antenna Test Execution
Several tests have been executed to generate a performance overview of the Neosid antennas used in
combination with the PaLFI device.
• Communication distance over functionality (detection and data communication range)
• Induced Current and Voltage over distance
4.2.1
Neosid Antenna Functional Performance
Table 1 provides an overview of the measured communication distance of the Neosid standard PaLFI
antennas using the EVM reader. To increase the performance, the Reader is set to an operating voltage
of 5 V and 12 V. The tested system functionality is: Read Single Block, Write Configuration and Flash LED
as described in the eZ430-TMS37157 Development Tool User's Guide (SLAU281).
Table 1. Neosid Antenna Functional Performance
NEOSID Part #
Reader
eZ430-TMS37157 at
5V USB supply
eZ430-TMS37157 at
12V External supply
Read Page
65
98
Configuration
53
85
Flash LED
42
74
Read Page
115
170
Configuration
94
140
Flash LED
75
120
Read Page
45
68
Configuration
42
64
Flash LED
39
61
Read Page
49
69
Configuration
47
67
Flash LED
42
62
Read Page
61
87
Configuration
53
71
Flash LED
35
61
Read Page
85
112
Configuration
67
92
Flash LED
55
86
Read Page
50
92
Configuration
42
75
Flash LED
38
58
Read Range [mm]
00 6172 44
88 840 62
88 840 65
88 8040 61
88 8040 71
88 8040 72
88 8040 66
Read Page
Configuration
Flash LED
8
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4.2.2
Neosid Antenna Functional Performance Summary
Figure 9 gives an overview of the communication (operating) distance using the PaLFI IC with the Neosid
00 6172 44 antenna and different reader RF power and antenna geometry.
Figure 9. Neosid Antenna Functional Performance Summary
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Neosid
4.2.3
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Neosid Antenna Induced Voltage/Current Performance
Figure 10 illustrates how to read the diagrams.
Figure 10. Neosid Antenna Induced Voltage/Current Performance
10
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Neosid
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Figure 11. PaLFI EVM Reader at 5 V USB Power Supply
Figure 12. PaLFI EVM Reader at 12 V ext. Power Supply
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Contacts and References
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Figure 13. RI-RFM-007 + RI-ANT-S01C at 12 V Power Supply
Figure 14. RI-RFM-007 + RI-ANT-G02E at 12 V Power Supply
5
Contacts and References
•
•
•
•
•
•
12
http://www.neosid.de/
http://www.ti.com/product/tms37157
80mA, 10V, 3.2μA Quiescent Current Low-Dropout Linear Regulator in SC70 or SON 2x2 Data Sheet
(SBVS116)
eZ430-TMS37157 Development Tool User's Guide (SLAU281)
http://www.ti.com/rfid/
http://www.neosid.de/produkte/induktivitaeten/transponderspulen/
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Appendix A ANNEX
A.1
Neosid Antenna Specification
Rx/Tx-Antennas
Series Ms 32ka [10µH-39 mH]
L
Q≥
fL,Q [kHz]
fres ≥
RDC ≤
Imax
S
Art. Nr.:
[mH]
[MHz]
[Ω]
[mA]
[mV/A/m]
2.66
55
125/134
0,6
26
50
35
00 6172 44
Gluing with PCB by HSF optional
S-measurement with Helmholtz coil at *125 kHz, *1 21,8 kHz
Flat Top
Lötflächen - Empfehlung:
3.6
2,8
2,5
12,0
1,6
11,6
Series Ms 32c [10µH-39mH]
L
[mH]
Q≥
fL,Q
[kHz]
2.66
-
125
Gluing with PCB by HSF optional
fres ≥
[MHz]
RDC ≤
[Ω]
Imax
[mA]
0,5
20
30
S*
[mV/A/m]
Art. Nr.:
88 8040 61
measurement
Swith Helmholtz coil at *125 kHz, *1 21,8 kHz
14,5
14,8
2,75
2,4
Flat Top
1,6
3,2
Series Ms 62
L
[mH]
Q≥
fL,Q [kHz]
fres ≥
[MHz]
RDC ≤
[Ω]
Imax
[mA]
S
[mV/A/m]
Art. Nr.:
2.66
60
125/134
0,5
3
200
-
88 8040 62
Gluing with PCB by HSF optional
S-measurement with Helmholtz coil at *125 kHz, *1 21,8 kHz
34,8
Y
Lötflächen - Empfehlung 3,5 : 1
10,5
30,0
9,8
7,2
5,5
A
3,5
Z
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E
26,5
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Air Coil Antenna Specification
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Series Sd 8
Q≥
fL,Q [kHz]
fres ≥
[MHz]
RDC ≤
[Ω]
Imax
[mA]
S*
[mV/A/m]
Art. Nr.:
2.66
120
125
0.7
12
150
-
88 8040 72
<9,9
L
[mH]
<8,2
L-Wert
...
...
...
Fertigungs- Code
nach DIN- IEC 62 z.B.: D5 = 5.1993
NEOSID
Ansicht von oben
(ohne Haube)
W
...
...
...
H
15+ 0,5
7,2 -0,3
E
18
9.
A
4
5
12,7
Series SM-W903 [1µH-65mH]
L
[mH]
Q≥
fL,Q [kHz]
fres ≥
[MHz]
RDC ≤
[Ω]
Imax
[mA]
S*
[mV/A/m]
Art. Nr.:
2.66
70
125/134
1,0
16
60
-
88 8040 66
S-measurement with Helmholtz coil at *125 kHz, *1 21,8 kHz
A.2
2,8
3,6
11
,0
10,7
ø10,0
5,6
2,9
9,5
Air Coil Antenna Specification
Table 2. Air coil 22mm
Min
DI [mm]
Max
Comment
14.3
DO [mm]
Q
Nom
22
60
Inductance [mH]
2.66
Wire ø [mm]
0.1
at 134.2kHz
Table 3. Air coil 77mm
Min
DI [mm]
14
Max
Comment
55
DO [mm]
Q
Nom
77
60
Inductance [mH]
2.66
Wire ø [mm]
0.1
TMS37157 Passive-Low Frequency Interface IC Performance With Neosid
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at 134.2kHz
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PaLFI Reference Circuit / Design
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A.3
PaLFI Reference Circuit / Design
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PaLFI EVM Power Module HW Modifications
A.4
PaLFI EVM Power Module HW Modifications
A.4.1
•
•
•
A.4.2
•
•
•
•
•
16
www.ti.com
Reader Modules
RI-RFM-008B: http://focus.ti.com/docs/prod/folders/print/ri-rfm-008b.html
RI-RFM-007B: http://focus.ti.com/docs/prod/folders/print/ri-rfm-007b.html
Reader Antenna:
http://focus.ti.com/paramsearch/docs/parametricsearch.tsp?family=rfid&amp;sectionId=475&amp;tabId
=2104&amp;familyId=1354amp;paramCriteria=no
Parts Needed
RI-ACC-ADR2 Board (found in ez430-TMS37157 kit)
RI-RFM-007B Module (available through distribution)
see the Series 2000 Reader System High Performance Reader Frequency Module RI-RFM-007B
Reference Guide (SCBU022)
RI-ANT-x0xx Antenna (available through distribution)
see the Antenna Reference Guide (SCBU025)
Recommended Components
– 330 Ω resistor (for current limiting TXCT activity LED)
– 1kΩ resistor
– 2.2kΩ resistor
– One LED (your choice of color and size, for TXCT activity indication)
– Board Headers for mounting RFM (0.100CTR Double Row Style)
– Four 4x40 Standoffs (for mounting RFM to circuit board)
Small Circuit Board
– 15” x 10” or greater size (similar to picture at end of presentation)
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PaLFI EVM Power Module HW Modifications
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+5V
(J4 Pin 9)
RI-ACC-ADR2
(PaLFI Base Station)
Reader Modules
330
+ 12 V
+ 12 V
Jumper
(for power measurement)
J4 Pin 10
J4 Pin 3
SCIO
R33
TXCT
J4 Pin 4
RXDAT
J4 Pin 2
RXCLK
Note:
Change needed on board!
Pin 2 (TXCT)
Pin 4 (RXDAT)
1K
Pin 6 (RXCLK)
2.2K
J4 Pin 5, 6
•
Pin 1, 7, 9
Implement change on RI-ACC-ADR2 board - remove R33 and connect J4 pin2 with via
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PaLFI EVM Power Module HW Modifications
•
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Use modified Firmware that can handle the RXCLK / RXDAT signals
– Firmware file for RI-ACC-ADR2 Reader use copy paste to save this file: PaLFI_Power_RFM.hex
MSP430 FET Tool (MSP-FET430UIF)
Remove USB board to access
Jp3 JTAG connector.
A.4.3
•
18
Product Information
http://focus.ti.com/docs/prod/folders/print/tms37157.html?DCMP=Palfi&amp;HQS=Other+BA+palfib
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Products
Applications
Audio
www.ti.com/audio
Automotive and Transportation
www.ti.com/automotive
Amplifiers
amplifier.ti.com
Communications and Telecom
www.ti.com/communications
Data Converters
dataconverter.ti.com
Computers and Peripherals
www.ti.com/computers
DLP® Products
www.dlp.com
Consumer Electronics
www.ti.com/consumer-apps
DSP
dsp.ti.com
Energy and Lighting
www.ti.com/energy
Clocks and Timers
www.ti.com/clocks
Industrial
www.ti.com/industrial
Interface
interface.ti.com
Medical
www.ti.com/medical
Logic
logic.ti.com
Security
www.ti.com/security
Power Mgmt
power.ti.com
Space, Avionics and Defense
www.ti.com/space-avionics-defense
Microcontrollers
microcontroller.ti.com
Video and Imaging
www.ti.com/video
RFID
www.ti-rfid.com
OMAP Applications Processors
www.ti.com/omap
TI E2E Community
e2e.ti.com
Wireless Connectivity
www.ti.com/wirelessconnectivity
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