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TI-TMS37157.pdf
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TMS37157
www.ti.com
SWRS083A –SEPTEMBER 2009–REVISED NOVEMBER 2009
PASSIVE LOW FREQUENCY INTERFACE DEVICE WITH EEPROM
AND 134.2 kHz TRANSPONDER INTERFACE
Check for Samples: TMS37157
1
FEATURES
APPLICATIONS
• Wireless Batteryless Sensor Interface using
• Wide Supply Voltage Range 2 V to 3.6 V
Energy Harvesting
• Ultra Low Power Consumption
– Microcontroller and Sensor can be
– Active Mode Max. 150 μA
Powered Through the LF Link
– Power Down Mode 60 nA
– Data is Directly Transmitted Over the LF
• 121 Free Bytes User Memory
Link From the Base Station via the
TMS37157 to the Micrcontroller and Vice
• Low Frequency Halb Duplex (HDX) Interface
Versa.
– HDX Transponder Communication
• Batteryless Configuration Memory
Achieving Maximum Perfomance and
– Memory can be Written Without Battery
Highest Noise Immunity
Support
– Special Selective Addressing Mode Allows
– Microcontroller can Read the Content of the
Anti Collision
Memory When It Gets Connected to a
– Up to 8 kbit/s LF Uplink Data Rate
Battery and Use It for Configuration
– 126 Byte EEPROM:
– Microcontroller can Write the Memory,
Which can be Read Out Later Through the
– 121 Bytes Free Available EEPROM User
LF Link
Memory
• Ultra Low Power Data Logger Memory (Smart
– 32 Bit Unique Serial Number
Metering)
– 8 Bit Selective Address
– Memory Can Be Written By a
– High EEPROM Flexibility
Microcontroller
– Pages are Irreversible Lockable and
– Memory Can Be Read Through LF Interface
Protectable
Without Battery Support
– Battery Check and Battery Charge Function • Multi Purpose LF Interface to a Microcontroller
– Short Range RF Interface to a
– Resonance Frequency: 134.2 kHz
Microcontroller Where Other Frequencies
– Integrated Resonance Frequency Trimming
are Not an Option
– Downlink – Amplitude Shift Keying
– Ultra Low Power Mode can Result in an
– Uplink – Frequency Shift Keying
Overall Power Consumption of 60 nA
• 3 Wire SPI Interface for Accessing the
• Remote Control Application
EEPROM and Exchanging Data With the
– Combination With an UHF Transmitter or IR
Microcontroller Through the LF Interface
Transmitter and a μC
• 0.6mm Pitch, 4mm x 4mm VQFN Package
– Power Management of the TMS37157 can
Power Down the Microcontroller
– The Push Button Detection Circuit can
Power Up a Microcontroller
• Stand Alone LF-Transponder with Memory
– RFID Transponder with Unique ID and 121
Bytes Free Programmable EEPROM User
Memory
– Only Few Additional Components Needed
– No Battery Required
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Copyright © 2009, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
LF Reader
134,2 kHz
TMS37157
Microcontroller
LF DATA
ENERGY
Base Station
Sensor System
Digital or Analog
Sensor
TMS37157
SWRS083A –SEPTEMBER 2009–REVISED NOVEMBER 2009
www.ti.com
DESCRIPTION/ORDERING INFORMATION
The TMS37157 combines a Low Frequency Transponder Interface with an SPI Interface and Power
Management for a connected microcontroller. It is the ideal device for any Configuration, Data Logger-, Sensor-
or Remote Control Application. The Transponder memory is accessible through SPI and LF and, in the second
case, operates without the need for a battery. The use of the Low Frequency Band ensures a communication in
a defined direction and harsh environments.
The TMS37157 manages the Transponder communication and push button interaction. During sleep state the
devices enters a special low power mode with only 60 nA current consumption.
The EEPROM memory is accessible over the LF interface without support from the battery or through SPI by a
microcontroller if a battery is connected. The TMS37157 offers a special battery charge mode.
The external resonance circuit with a LF coil and a resonance capacitor can be trimmed to the correct resonance
frequency with the integrated trimming capability achieving an easy way to eliminate part tolerances.
The small RSA 16-pin package together with only a few external components results in a cost efficient design.
2 Submit Documentation Feedback Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s): TMS37157
1
16 15 14 13
12
11
10
9
8765
4
3
2
RF1
TCLK
TDAT
TEN
E
O
B
P
U
S
H
BUSY
CLK_AM
SPI_CLK
SPI_SIMO
VBATI
VBAT
GND
VCL
N
P
O
R
SPI_SOMI
TMS37157
www.ti.com
SWRS083A –SEPTEMBER 2009–REVISED NOVEMBER 2009
PIN CONFIGURATION
TERMINAL FUNCTIONS
TERMINAL
I/O DESCRIPTION
NAME NO.
RF1 1 I Antenna
Test interface - clock input. Data is shifted in and out of the TDAT pin on the rising edge of
TCLK 2 I
TCLK.
TDAT 3 I/O Test interface – bidirectional serial data I/O for configuration and trimming.
TEN 4 I Test interface – enable input.
EOB 5 O End of burst detector. This signal is high when the RF signal of the base station is OFF.
NPOR 6 O Active low power-on-reset (open drain) - can be used to reset the microcontroller.
PUSH 7 I Input of the push button detector – can be used to recognize that a push event has occurred.
Indicates internal control unit activity:
• During initialization
BUSY 8 O
• During transponder operation
• During SPI communication (handshaking)
This output provides clock signals derived from the external antenna resonance circuit to the
CLKA_M 9 O microcontroller. This function can be activated by an SPI command. Two frequencies are
selectable FRES and FRES/4.
SPI_CLK 10 I SPI clock input
SPI_SOMI 11 O SPI data output
SPI_SIMO 12 I SPI data input
VBATI 13 PWR Can be used as μC supply voltage
VBAT 14 PWR Battery supply
GND 15 PWR Ground
VCL 16 PWR Charge capacitor
ORDERING INFORMATION
T
A
PACKAGE
(1) (2)
ORDERABLE PART NUMBER TOPSIDE MARKING
–40°C to 85°C VQFN – RSA Reel of 3000 TMS37157IRSARG4 37157I
(1) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
(2) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
website at www.ti.com.
Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 3
Product Folder Link(s): TMS37157
TMS37157
SWRS083A –SEPTEMBER 2009–REVISED NOVEMBER 2009
www.ti.com
ABSOLUTE MAXIMUM RATINGS
(1)
over operating free-air temperature range (unless otherwise noted)
MIN MAX UNIT
T
A
Operating free air temperature –40 85 °C
T
s
Storage temperature
(2)
–40 125 °C
V
BAT
Battery voltage –0.3 3.6 V
V
CL
V
CL
input voltage 7 V
I
RF
Input current
(3)
10 mA
(1) Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating
conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) One cycle up to 1000h
(3) Continuous
OPERATING CONDITIONS
PARAMETER MIN TYP MAX UNIT
Q
op
Operating system quality factor ≥30
V
BAT
Battery voltage 2 3 3.55 V
IC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE
SUPPLY AND REFERENCE CURRENTS
PARAMETER MIN TYP MAX UNIT
IVBATI Current out of V
BATI
V
BAT
= 2.0 V 16 mA
dVsw2 Voltage drop at SW2 (V
BAT
– V
BATI
) I
BATI
= 16 mA, V
BAT
= 2.0 V 100 mV
I
quiet
Quiescent current TMS37157 idle 60 300 nA
I
active
Operating current TMS37157 active 150 μA
I
charge
Battery charge current 2 mA
MODULATION CAPACITOR
PARAMETER MIN NOM MAX UNIT
CM Modulation capacitor L = 2.66 mH 110 pF
FRONT END CONTROL
PARAMETER MIN NOM MAX UNIT
t
reset
TMS37157 front-end reset time 14 ms
t
Hdet
High bit detection threshold time f
TX
= 134.2kHz 64/f
TX
us
CHARACTERISTICS OF TRANSPONDER SECTION
PARAMETER MIN NOM MAX UNIT
t
prebit
Prebit time f
L
= 134.7kHz 1.9 ms
t
trans
High bit transition time of start byte 0x7E 2 ms
t
high
High bit time f
H
= 123.7kHz 0.129 ms
t
low
Low bit time f
L
= 134.7kHz 0.118 ms
T
resp
Response time 12 ms
VCL/VBAT CHECKER
PARAMETER MIN NOM MAX UNIT
High Level V
BAT
checker threshold voltage 2.9 V
Low Level V
BAT
checker threshold voltage 2.1 V
4 Submit Documentation Feedback Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s): TMS37157
TMS37157
www.ti.com
SWRS083A –SEPTEMBER 2009–REVISED NOVEMBER 2009
VCL/VBAT CHECKER (continued)
PARAMETER MIN NOM MAX UNIT
V
charge
V
BAT
charge voltage 3.4 V
Vch V
CL
checker threshold voltage 3.1 V
TRIMMING CAPACITORS AND SWITCHES
PARAMETER MIN NOM MAX UNIT
T
step
Trimming steps 128
C
Tmin
Minimum trimming capacitor 0 pF
C
T1
Trimming capacitor 1 0.6 pF
C
T2
Trimming capacitor 2 1.2 pF
C
T3
Trimming capacitor 3 2.4 pF
C
T4
Trimming capacitor 4 4.7 pF
C
T5
Trimming capacitor 5 9.4 pF
C
T6
Trimming capacitor 6 18.8 pF
C
T7
Trimming capacitor 7 37.6 pF
C
T
Maximum trimming capacitor (CT = CT1+ CT2+ … + CT7) 63.5 74.4 85.9 pF
RF LIMITER
PARAMETER MIN NOM MAX UNIT
V
RFlim
RF limiter voltage 10.5 12 14 V
V
CLlim
Limited V
CL
voltage Limited V
CL
voltage is the result of the RF 5.75 5.9 6.5 V
limiter in the application circuit
CONTROL AND SPI INTERFACE
PARAMETER MIN NOM MAX UNIT
Busy low time See SPI Comm. 30-70 μs
Busy high time See SPI Comm. 10-30 ms
PARAMETER MIN NOM MAX UNIT
V
OL
Low level output voltage, SPI_SOMI, V
BAT
= 2.0…3.6V, R
L
= 100 kΩ 0.05 × 0.07 × V
BUSY VBAT VBAT
V
OH
High level output voltage, V
BAT
= 2.0…3.6V, R
L
= 100 kΩ 0.93 × 0.95 × V
SPI_SOMI, BUSY VBAT VBAT
V
IL
Low level input voltage, SPI_SIMO, V
BAT
= 2.0…3.6V, R
L
= 100 kΩ 0.1 × V
SPI_CLK VBAT
V
IH
High level input voltage, SPI_SIMO, V
BAT
= 2.0…3.6V, R
L
= 100 kΩ 0.9 × VBAT V
SPI_CLK VBAT
ACTIVATION LIMIT OF TMS37157
PARAMETER MIN NOM MAX UNIT
Vact Activation level for transponder f = 134.2 kHz
(1)
5.75 5.9 6.5 V
response
(1) At beginning of the response the voltage V
CL
must be just limited. Only in this case the function is guaranteed if components and I
C
parameters are at the limit, see Figure 1 . The voltage is measured at V
CL
just before the Transponder starts with the response protocol.
The longest in the application used downlink telegram with maximum number of high bits should be used. The low and high bit response
frequency should be at the lowest value which occurs in the application. In case of an additional power phase (Programming) the level
has to be after that additional power phase.
Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 5
Product Folder Link(s): TMS37157
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