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Texas Instruments TRIS TMS37122 Reference Manual
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Texas Instruments TRIS TMS37122 Reference Manual

Texas Instruments TRIS TMS37122 Reference Manual

Tiris automotive devices analog front end ic
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August '01
Chapter 3. Application
TIRIS Automotive Devices
Analog Front End IC TMS37122
Reference Guide
11-09-21-046
August 2001
1

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Summary of Contents for Texas Instruments TRIS TMS37122

  • Page 1 August ’01 Chapter 3. Application TIRIS Automotive Devices Analog Front End IC TMS37122 Reference Guide 11-09-21-046 August 2001...
  • Page 2 Analog Front End IC TMS37122 Texas Instruments (TI) reserves the right to make changes to its products or services or to dis- continue any product or service at any time without notice. TI provides customer assistance in various technical areas, but does not have full access to data concerning the use and appli- cations of customer's products.
  • Page 3 August ’01 Preface About This Guide This manual describes the TIRIS 3D-Analog Front End integrated circuit (TMS37122), it de- scribes the functions and parameters of the 3D-Analog Front End. This circuit enables expan- sion of a current Remote Keyless Entry system to Keyless Entry function. It provides the information that you will need in order to use the integrated circuit in your RFID system.

  • Page 4: Table Of Contents

    Analog Front End IC TMS37122 - Reference Guide August ’01 Document Overview Page Chapter 1: Product Description........6 General Features .................
  • Page 5 August ’01 Preface Figure 18: State Diagram of LF Transmission Mode ........32 Figure 19: Memory Organisation..............33 Figure 20: Default Memory Content ............. 34 Figure 21:VWAKEA Sensitivity Diagram............36 Figure 22: System Schematic for Indoor/Outdoor Detection......37 Figure 23: VWAKEB SENSITIVITY Diagram ..........38 Figure 24: Timing Diagram for Test Mode PTx04 ........
  • Page 6 CHAPTER 1 Product Description Chapter 1: Product Description This chapter introduces the TIRIS 3D-Analog Front End (AFE) low voltage, low current in- terface circuit for microcomputer controlled Automotive Keyless Entry Systems. Topic Page General Features..................7 References....................7 Circuit Description..................8...

  • Page 7: General Features

    August ’01 Chapter 1. Product Description General Features • Analog Front End IC for RF Identification Systems • Supports 120 … 140 kHz Systems • Low Standby Current of typical 5 µA • < 10 mV peak-to-peak sensitivity • Interfaces to up to three antennas •...

  • Page 8: Circuit Description

    Analog Front End IC TMS37122 - Reference Guide August ’01 Circuit Description The 3D-Analog Front End (AFE) circuit TMS37122 is a low voltage, low current interface circuit for microcomputer controlled Automotive Keyless Entry Systems. With few external components it provides a 120 to 140 kHz inductive Low Frequency Channel for high-speed data transfer to a microcomputer or other control circuits.
  • Page 9 August ’01 Chapter 1. Product Description Typically the device is supplied by a 3 V Lithium-battery. A built-in voltage regulator allows a battery charge of appropriate battery types or a battery back-up function. In back-up function it is possible to transmit data back to the base station via one of the low frequency channels without using the UHF Transmitter.

  • Page 10: Figure 3: Typical 3D-Afe Application Including Battery Backup Function

    Analog Front End IC TMS37122 - Reference Guide August ’01 Figure 3: Typical 3D-AFE Application Including Battery Backup Function PASSIVE ENTRY/ PASSIVE START TRANSPONDER WITH BATTERY BACKUP FUNCTION 3-D ANALOG FRONT-END TMS37122 TCLK TDAT VCCO VBAT WDEEN WAKE EOBA CLKA/M Dbat INT/INP INT/INP TIMER...

  • Page 11: Table 1: Description Of The Device's Pins

    August ’01 Chapter 1. Product Description Table 1: Description of the Device’s Pins Pin # Description Device ground pin. It is the ground potential for all device signals. Output of the on-chip voltage regulator. This voltage regulator regulates the VCL voltage down to 3.0 V (nominal). The VCCO voltage is used to supply internal logic, as well as the external Micro-computer VCCO (in Backup Mode).
  • Page 12 Analog Front End IC TMS37122 - Reference Guide August ’01 Table 1: Description of the Device’s Pins Pin # Description Activation pin for Antenna 1 Transmission Mode. When this pin is set, the antenna resonator 1 is initiated to oscillate. The serial data to be transmitted must be applied at MOD pin synchronous to CLKA/M output.

  • Page 13: Chapter 2: Electrical Description

    CHAPTER 2 Electrical Description Chapter 2: Electrical Description This chapter describes the electrical circuitry of the 3D-Analog Front End (AFE) integrated circuit TMS37122 Topic Page General......................15 Power Supply ...................17 2.2.1 VBAT Supply..................17 2.2.1.1 Standard Battery Supply.............17 2.2.1.2 Rechargeable Battery Supply .............17 2.2.1.3 Battery Backup Supply ...............18 2.2.2...
  • Page 14 Analog Front End IC TMS37122 - Reference Guide August ’01 Continued Topic Page 2.10 Configuration Memory................32 2.10.1 Memory Organisation................32 2.10.2 Default Memory Content ..............33 2.10.3 Configuration Options ................35 2.10.3.1 Wake Sensitivity VWAKEA/1 ............35 2.10.3.2 Passive Start Sensitivity VWAKEB/1/2/3 ........36 2.10.3.3 Pulse Position Demodulator Threshold ........38 2.10.3.4 Wake Pattern Detection Flag 'NO_WAKE' .........39 2.10.3.5 Write Distance Expander 2 Flag 'NO_WDE2'......39 2.10.3.6 Write Distance Expander 3 Flag 'NO_WDE3'......39...

  • Page 15: General

    August ’01 Chapter 2. Electrical Description General The TMS37122 consists of the following main function blocks (see Figure 4): RF Limiter (3 fold) 8-bit Trimming Circuit (3 fold) Rectifier (3 fold) VCL Limiter Voltage Regulator (VCCO) with reverse current protection (diode) Clock Regenerator for Pluck Circuit and modulation clock divider.

  • Page 16: Figure 4: Block Schematic Of Tms37122

    Analog Front End IC TMS37122 - Reference Guide August ’01 WDEEN 3D-ANALOG FRONT-END IC TMS37122 VBAT TEST EOBA WAKE PTx04/07 DETECTOR CLKA/M WAKE WAKEI1 DETECTOR 3 WAKEI2 CONTROL UNIT WAKEI3 VWAKE A2/3 WITH EOBA VWAKE B2/3 CONFIGURATION WATCH- LIM3 EEPROM CLKI VBAT TEST...

  • Page 17: Figure 5: Standard Battery Supply - Schematic

    August ’01 Chapter 2. Electrical Description Power Supply 2.2.1 VBAT Supply Most parts of the 3D-AFE are supplied via VBAT input. Typically a 3 V Lithium Battery is used but also the use of rechargeable batteries is possible. Directly at the TMS37122 input a Buffer Capacitor (Cbat) should be provided with short connections to VBAT and GND pin.

  • Page 18: Figure 6: Schematic For Rechargeable Battery Supply

    Analog Front End IC TMS37122 - Reference Guide August ’01 In case of very high field strength VCL decreases due to IC characteristic in the very near distance range. To keep the maximum VCL it is recommended to connect a Schottky diode (e.g.

  • Page 19: Figure 7: Schematic For Battery Backup Supply

    August ’01 Chapter 2. Electrical Description inputs (RF1, RF2, RF3) and GND is recommended to keep maximum VCL. Figure 7: Schematic for Battery Backup Supply VOLT. REG. CL > = 2.2µF Rectifier BAT42 Diode VCCO µC VBAT VBAT Cbat = 22nF Battery 3DSUP03A.CH4 2.2.2...

  • Page 20: Test Mode

    Analog Front End IC TMS37122 - Reference Guide August ’01 The available voltage range depends on the voltage VCL, which can be charged into CL during extended Wake-up Time and the minimum required supply voltage for the oscillation maintenance circuit (Continuous Pluck Circuit). For proper function with minimum 3 V should be calculated.

  • Page 21: Power Supply

    August ’01 Chapter 2. Electrical Description Figure 8: Test Arrangement with Digital Interface Test Box and PC PASSIVE ENTRY/ PASSIVE START TRANSPONDER WITH BATTERY BACKUP FUNCTION 3-D ANALOG FRONT-END TMS37122 RS232 TCLK µC TDAT VCCO VBAT WDEEN WAKE EOBA CLKA/M DIGITAL IEEE INTERFACE...

  • Page 22: Power-On-Reset

    If the Battery Backup function is used, we recommend to use a Low Power Supervisory cir- cuit (Isupply < 1 µA). One device that could be used is: - TPS3836/37 (Texas Instruments) Figure 9: Schematic of Reset Flow VBAT VCCO...

  • Page 23: Limiter Circuits

    August ’01 Chapter 2. Electrical Description Limiter Circuits The TMS37122 has separate Limiter Circuits at the RF inputs, which prevents the high volt- age parts of the circuit from overload (see Figure 10). The circuit limits the positive half-wave with respect to ground. The negative half-wave is clamped to ground by the Rectifier Diode. The peak-to-peak amplitude is therefore approximately two times the VCL voltage.

  • Page 24: Wake Detector

    Analog Front End IC TMS37122 - Reference Guide August ’01 Wake Detector Wake Detector 1…3, which are enabled by the Configuration Memory, are activated by the Control Unit when WDEEN is activated. The first stage of the Wake Detector is an Automatic Gain Control (AGC) Amplifier, which is initially at maximum amplification (see Figure 11).

  • Page 25: End-Of-Burst Detector

    August ’01 Chapter 2. Electrical Description End-of-burst Detector The Base Station transmits after a low frequency (LF) Wake burst data to the Identification Device by means of 100% amplitude modulation (see Figure 12). At the resonant circuit of the Identification Device this results in LF bursts and LF burst pauses or at least LF amplitude drops depending on the duration of transmitted burst pause and the quality factor of the in- volved resonant circuits.

  • Page 26: Control Unit

    Analog Front End IC TMS37122 - Reference Guide August ’01 currence of WAKEI for maximum 17 EOBI pulses. At each negative transition of EOBI a 7- bit counter is reset and starts to count the regenerated RF clock (CLKI). If the counter reaches the Pulse Position Modulation (PPM) threshold before the next negative transition, the counter is stopped and a high bit is shifted in a compare shift register with this transition.

  • Page 27: Figure 13: Overall State Diagram Of Control Unit

    August ’01 Chapter 2. Electrical Description Figure 13: Overall State Diagram of Control Unit CLKI missed WDEEN = LOW for twdg WDEEN = LOW WDEEN Off-Mode = LOW (Iquiet) TX = HIGH and CLKI = CLKI WDEEN = HIGH missed TX = LOW and twdg WAIT...

  • Page 28: Figure 14: Initialization State Diagram Of Tms37122

    Analog Front End IC TMS37122 - Reference Guide August ’01 2.8.1 Off Mode The Control Unit is reset with low level at input WDEEN (see Figure 14). No internal power-on-reset circuit is provided. The circuit is in Off Mode and consumes only the quiescent current (Iquiet).

  • Page 29: Control Unit

    August ’01 Chapter 2. Electrical Description The supply current decreases because only one Wake Detector remains active (Iact). Figure 15: Control Unit Timing Diagram tWAKE RFreader VWAKE RFtrp WDEEN tPdly WAKE_I tWdly EOBI CLKI WAKE EOBA CLKA/M IBAT Iquiet Istby Iinit Iact Iquiet...

  • Page 30: Figure 16: Wake Pattern Detection State Diagram

    Analog Front End IC TMS37122 - Reference Guide August ’01 or Passive Start Wake Pattern is received. Figure 16: Wake Pattern Detection State Diagram CLKI missed for twdg WDEEN Off-Mode = LOW (Iquiet) CLKI = CLKI missed TX = LOW and twdg WDEEN = HIGH Standby-...

  • Page 31: Fsk Modulator

    August ’01 Chapter 2. Electrical Description demodulation function. If the Wake Pattern B (Passive Start) is detected, the circuit first checks, if the RF Amplitude is above the threshold VWAKEB. VWAKEB is typically configured higher than VWAKEA so that an Identification Device outside the car will not reach this RF level. It will enter the Telegram Waiting loop (tTelegr) and then return to Standby Mode (see Figure 17).

  • Page 32: Configuration Memory

    Analog Front End IC TMS37122 - Reference Guide August ’01 The LF Transmission Mode can also be entered directly from the OFF Mode. For this purpose the TX input must be set to high before the WDEEN is set. Releasing TX while WDEEN = high will switch to Transparent Mode.

  • Page 33: Figure 19: Memory Organisation

    August ’01 Chapter 2. Electrical Description Figure 19: Memory Organisation NIBBLE Bit 3 Bit 0 Bit 3 Bit 0 Bit 3 Bit 0 Bit 3 Bit 0 Bit 3 Bit 0 PPM THRESHOLD VWAKE B/ 2/3 VWAKE B/ 1 VWAKE A/ 1 CLKA WDE3 WDE2...

  • Page 34: Figure 20: Default Memory Content

    Analog Front End IC TMS37122 - Reference Guide August ’01 Figure 20: Default Memory Content NIBBLE Bit 3 Bit 0 Bit 3 Bit 0 Bit 3 Bit 0 Bit 3 Bit 0 Bit 3 Bit 0 PPM THRESHOLD VWAKE B/ 2/3 VWAKE B/ 1 VWAKE A/ 1 WDE2...

  • Page 35: Table 3: Wake Sensitivity Vwakea/1 Options

    August ’01 Chapter 2. Electrical Description 2.10.3 Configuration Options 2.10.3.1 Wake Sensitivity VWAKEA/1 A three-dimensional antenna arrangement typically consists of 2 ferrite antennas, positioned in an angle of 90 degree and an air coil antenna. Preferably the air coil antenna is connected to RF1 because for key fob and card applications this antenna has the optimum orientation with respect to the Base Station antennas.

  • Page 36: Figure 21:Vwakea Sensitivity Diagram

    Analog Front End IC TMS37122 - Reference Guide August ’01 Figure 21:VWAKEA Sensitivity Diagram SPECmin SPECnom SPECmax CONFIGURATION 2.10.3.2 Passive Start Sensitivity VWAKEB/1/2/3 If the system includes Passive Start function, it can be helpful to implement an indoor/outdoor detection to avoid erroneous start of the engine by inside person in case Identification Device is outside.

  • Page 37: Figure 22: System Schematic For Indoor/Outdoor Detection

    August ’01 Chapter 2. Electrical Description Figure 22: System Schematic for Indoor/Outdoor Detection Passive Start Sensitivity (VWAKEB1, VWAKEB2/3) PE Wake Pattern Passive Entry Sensitivity (VWAKEA/1, VWAKEA/2/3) PS Wake Pattern 3DPSAP1.DRW Table 4: Passive Start Sensitivity Options Passive Start Sensitivity VWAKEB/1/2/3 VWAKEB/1/2/3 VWAKEB/1/2/3 min [mVpp]...

  • Page 38: Figure 23: Vwakeb Sensitivity Diagram

    Analog Front End IC TMS37122 - Reference Guide August ’01 Figure 23: VWAKEB SENSITIVITY Diagram SPECmin SPECnom SPECmax CONFIGURATION 2.10.3.3 Pulse Position Demodulator Threshold Four bits are provided defining the Pulse Position Demodulation Threshold Count (cHdet) for decoding the PPM Wake Pattern. The resulting Threshold Time (tHdet) depends on the used system frequency: tHdet = cHdet / fTXThe numbers in below table are given for the nominal TIRIS System Frequency (fTX=134.2 kHz),the default cHdet is 56:...

  • Page 39: Table 5: Counter Definition For Pulse Position Demodulation

    August ’01 Chapter 2. Electrical Description Table 5: Counter Definition for Pulse Position Demodulation Pulse Position Modulation PPM Threshold Chdet Thdet Nom.[µs] 2.10.3.4 Wake Pattern Detection Flag 'NO_WAKE' If the NO_WAKE flag is set no Wake Pattern check is performed and the Control Unit switches directly to Transparent Mode if VWAKE-A threshold is exceeded.

  • Page 40: Passive Entry Wake Pattern

    Analog Front End IC TMS37122 - Reference Guide August ’01 the clock information (e.g. Manchester Coding). During Transmission Mode (TX=high) the clock CLKM is available even if CLKA is disabled. 2.10.3.8 Passive Entry Wake Pattern The desired Wake Pattern for the Passive Entry function can be selected as desired. If a sep- arate transponder for Immobilizer function is in the system, pattern should be avoided, which are similar to a Challenge telegram.

  • Page 41: Table 6: Counter Definition For Pulse Position Demodulation

    August ’01 Chapter 2. Electrical Description Table 6: Counter Definition for Pulse Position Demodulation Telegram Duration ttelegr ctelegr nom.[ms] 4096 30.5 8192 61.0 12288 91.6 16384 122.1 20480 152.6 24576 183.1 28672 213.7 32768 244.2 36864 274.7 40960 305.2 45056 335.7 49152 366.3...

  • Page 42: Table 7: Wake Pattern Waiting Time Options

    Analog Front End IC TMS37122 - Reference Guide August ’01 Table 7: Wake Pattern Waiting Time Options Wake Pattern Waiting Time cwait ttwait nom.[ms] 1024 2048 15.3 3072 22.9 4096 30.5 5120 38.2 6144 45.8 7168 53.4 8192 61.0 9216 68.7 10240 76.3...

  • Page 43: Figure 24: Timing Diagram For Test Mode Ptx04

    August ’01 Chapter 2. Electrical Description Figure 24: Timing Diagram for Test Mode PTx04 VBAT WDEEN TEST MODE PTx04 TDAT DATA NIBBLE TCLK 2 3 4 5 VBAT trVPP tPRG tfVPP 3DTMOD4A.DRW 2.10.5 Memory Read The result of programming function is checked with Read Test Mode PTx07 (see Figure 25). After shifting in the Test Mode (07hex), the Row and Nibble address, the Tester Unit con- nected to TDAT must be switched to input.

  • Page 44: Resonant Circuit Trimming

    Analog Front End IC TMS37122 - Reference Guide August ’01 Figure 25: Timing Diagram for Test Mode PTx07 VBAT WDEEN TEST MODE DATA OUT PTx07 TDAT NIBBLE undefined BIT 1 BIT 2-4 TCLK 2 3 4 5 1 2 3 4 VBAT 3DTMOD7.DRW 2.11...

  • Page 45: Resonance Frequency Measurement

    August ’01 Chapter 2. Electrical Description - PTx16 H-Bit frequency of Antenna 1 without plucking - PTx18 L-Bit frequency of Antenna 1 without plucking - PTx28 L-Bit frequency of Antenna 2 without plucking - PTx38 L-Bit frequency of Antenna 3 without plucking 2.11.1 Resonance Frequency Measurement The first action in the trimming process is a measurement of the base resonant circuit frequen-...

  • Page 46: Figure 26Timing Diagram For Test Mode Ptx18

    Analog Front End IC TMS37122 - Reference Guide August ’01 Figure 26Timing Diagram for Test Mode PTx18 VBAT WDEEN PERIOD DURATION MEASUREMENT >/= 10 PULSES TEST MODE PTx18 TDAT TCLK 2 3 4 5 VBAT 3DTMD18B.DRW...

  • Page 47: Figure 27: Timing Diagram For Test Mode Ptx14

    August ’01 Chapter 2. Electrical Description 2.11.2 Trimming EEPROM Programming Using the known typical parameters of the external components, IC input capacitance (CRF1, CRF2, CRF3) and the result from first resonance frequency measurement a necessary parallel capacitor can be calculated. From this it can be determined which internal trimming capaci- tors must be switched on.

  • Page 48: Chapter 3: Application

    Analog Front End IC TMS37122 - Reference Guide August ’01 Chapter 3: Application This chapter describes the various functions of the integrated circuit and how they can be used in actual applications. Topic Page Passive Entry Function ................49 Passive Start Function ................52 Battery Backup Function ................54 Immobilizer Function................56 Anti-Collision Function ................56...

  • Page 49: Passive Entry Function

    CHAPTER 3 Application Passive Entry Function The standard application of 3D-AFE is the Passive (Keyless) Entry function. The car driver approaches the car and triggers the Base Station by pulling the door handle or by another trig- ger mechanism. The Base Station transmits the Passive Entry (PE) Wake Pattern, a Command and a Challenge using typically an outdoor Antenna, for example in the outside mirror.

  • Page 50: Figure 28: Passive Entry Wake Pattern Detection

    Analog Front End IC TMS37122 - Reference Guide August ’01 Figure 28: Passive Entry Wake Pattern Detection BASE COMMAND + CHALLENGE WAKE-UP PASSIVE ENTRY WAKE PATTERN STATION TIME DATA TXCT- 0 0 1 0 0 0 0 0 0 0 0 0 0 0 DEVICE WDEEN WAKEI...

  • Page 51: Figure 29: Passive Entry Challenge/Response Timing

    August ’01 Chapter 3. Application Figure 29: Passive Entry Challenge/Response Timing PE COMMAND INIT ENCR WAKE WAKE PATTERN CHALLENGE BASE STATION TXCT- DEVICE WDEEN. VCL. WAKEI. WAKE. EOBA. CLKA/M RESPONSE 3DTIM02A.CH4...

  • Page 52: Passive Start Function

    Analog Front End IC TMS37122 - Reference Guide August ’01 Passive Start Function A further application of 3D-AFE is the Passive Start function. The car driver is already seated in the car and triggers the Base Station by pushing a button at the dashboard or at the middle console.

  • Page 53: Figure 30: Passive Start Wake Pattern Detection

    August ’01 Chapter 3. Application Figure 30: Passive Start Wake Pattern Detection BASE COMMAND + CHALLENGE WAKE-UP PASSIVE START WAKE PATTERN STATION TIME DATA TXCT- 0 0 1 0 0 0 0 0 0 0 0 0 0 0 DEVICE WDEEN WAKEI VWAKEA.

  • Page 54: Battery Backup Function

    Analog Front End IC TMS37122 - Reference Guide August ’01 Battery Backup Function It is assumed that the system is configured to work with Battery Backup Supply (see Figure 7) that means VCCO is able to supply VBAT. Battery voltage is so low that the Supervisory Circuit has reset the Microcomputer (see Figure 9).

  • Page 55: Figure 31: Timing Diagram For Battery Backup Function

    August ’01 Chapter 3. Application Figure 31: Timing Diagram for Battery Backup Function PE/ PS BACKUP COMMAND INIT ENCR WAKE WAKE PATTERN CHALLENGE BASE STATION TXCT- DEVICE VBAT RESET WDEEN. WAKE. EOBA CLKA/M 3DTIM03A.DRW...

  • Page 56: Immobilizer Function

    Analog Front End IC TMS37122 - Reference Guide August ’01 Immobilizer Function The current Immobilizer function could be desired additional (backup) or instead of Passive Start function. In this case the 3D-AFE together with a Microcomputer could even replace a TIRIS Transponder because compatibility can be achieved.

  • Page 57: Figure 32: Timing Diagram Of Anti-Collision Function

    August ’01 Chapter 3. Application Figure 32: Timing Diagram of Anti-Collision Function COMMAND (CAR NUMBER) INIT BASE ENCR REQUEST RESPONSE WAKE WAKE PATTERN STATION CHALLENGE TXCT- DEVICE WDEEN VCL. WAKE. EOBA. CLKA/M 3DTIM06A.CH4...

  • Page 58: Chapter 4: Product Specification Data

    Analog Front End IC TMS37122 - Reference Guide August ’01 Chapter 4: Product Specification Data This chapter describes all of the product specifications that you need to know in order to in- tegrate the device into your system. Topic Page Absolute Maximum Ratings..............59 Recommended System Operating Conditions........60 4.2.1...

  • Page 59: Absolute Maximum Ratings

    CHAPTER 4 Product Specification Data Absolute Maximum Ratings Parameter Sign Note Unit Operating free-air ºC temperature Storage Temperature ºC Battery Voltage VBAT -0.3 1.1 x Input Voltage MOD, TX -0.3 VBAT TEN, TCLK, 1.1 x Input Voltage -0.3 TDAT VBAT WAKE, CLKA/M High Level Output Current µA...

  • Page 60: Recommended System Operating Conditions

    Analog Front End IC TMS37122 - Reference Guide August ’01 Recommended System Operating Conditions 4.2.1 Base Station - Test Station Conditions Parameter Sign Note Unit Transmitter frequency 134.2 Wake-up Time tWAKE Wake-up Time tWAKE Backup Mode Data Rate 100% AM, PPM 2000 4000 bits/s...

  • Page 61: Recommended Operating Conditions For Ic

    August ’01 Chapter 4. Product Specification Data 4.2.3 Recommended Operating Conditions for IC 4.2.3.1 Identification Device Antennas Parameter Sign Note Unit Inductance of antenna for LR1,LR2, 25 ºC CR1,2,3 = 2.37 2.47 2.57 fRES=134.2kHz 470 pF +/- 5% Capacitance of LR1, LR2, Quality factor 4.2.3.2 Resonant Circuit Capacitor...
  • Page 62 Analog Front End IC TMS37122 - Reference Guide August ’01 4.2.3.4 Parameter Sign Note Unit Battery Voltage VBAT versus DG Battery Voltage Test VBAT Tst Power Supply Ripple Vripple mVpp WDEEN, MOD, 0.95 x 1.05 x High level input voltage TX,VBAT= VBAT VBAT...

  • Page 63: General

    August ’01 Chapter 4. Product Specification Data 4.2.4 IC Characteristics over Operating Free-air Temperature Range 4.2.4.1 General IC Characteristics Parameter Sign Note Unit 16-pin Package TSSOP 4.2.4.2 Input Capacitances Parameter Sign Note Unit Effective Input VCL = 5 V Capacitance CRF1 25 ºC (CRFx=CIx+ dCI/dV)

  • Page 64: Trimming Capacitors And Switches

    Analog Front End IC TMS37122 - Reference Guide August ’01 4.2.4.4 Trimming Capacitors and Switches Parameter Sign Note Unit Trimming Steps Tstep Min. Trimming Capacitor Trimming Capacitor 1 25 ºC Trimming Capacitor 2 25 ºC Trimming Capacitor 3 25 ºC Trimming Capacitor 4 25 ºC Trimming Capacitor 5...

  • Page 65: Clock Regenerator/ Pluck Logic

    August ’01 Chapter 4. Product Specification Data 4.2.4.6 Clock Regenerator/ Pluck Logic Parameter Sign Note Unit Clock Regenerator Vreg VCL = 2.5 V Sensitivity Clock Regenerator Vreg VCL = 6 V Sensitivity 4.2.4.7 RF Limiter Parameter Sign Note Unit Ilim = 10 µA RF Limiter Voltage VRFlim RF Limiter Voltage...

  • Page 66: Supply And Reference Currents

    Analog Front End IC TMS37122 - Reference Guide August ’01 4.2.4.10 Supply and Reference Currents Parameter Sign Note Unit VBAT = 4 V Quiescent Current Iquiet WDEEN = 0 V Stand-by current, VBAT = 4 V Istby µA 3 Antennas WDEEN = 4V Stand-by current, VBAT = 4 V...

  • Page 67: Figure 33: Measurement System:timing, Dynamic Current & Sensitivity

    August ’01 Chapter 4. Product Specification Data Figure 33: Measurement System:Timing, Dynamic Current & Sensitivity SIGNAL GENERATOR f_RES V_wakeA (B, C) 50Ohm TDAT ON / OFF 3D ANALOG FRONTEND IC TCLK f mod TMS 37122 CLKA VCCO WAKE EOBA WDEEN VBAT VBAT MODULATION...
  • Page 68 Analog Front End IC TMS37122 - Reference Guide August ’01 4.2.4.11.2 Wake Sensitivity A/Antenna 1 Parameter Sign Note Unit Configurable Wake Sensitivity A typical range VwakeA/1 mVpp Range/ Antenna 1 25 ºC, VBAT=3V Wake Sensitivity A/ Configured to VwakeA/1 mVpp Antenna 1 highest sensitivity Wake Sensitivity A...
  • Page 69 August ’01 Chapter 4. Product Specification Data Parameter Sign Note Unit Wake Sensitivity B RESB Resolution/Ant. 2 and 3 /2/3 Wake Sensitivity B VstepB 11.0 17.5 mVpp Step Size/ Ant. 2 and 3 /2/3...

  • Page 70: Clka Sensitivity

    Analog Front End IC TMS37122 - Reference Guide August ’01 4.2.4.12 CLKA Sensitivity Parameter Sign Note Unit Clock Regenerator VWakeA/ Vclka mVpp Sensitivity, CLKA 4.2.4.13 EOBA Sensitivity Parameter Sign Note Unit Vmax= Modulation Depth for valid VwakeA, EOBA (a=50%) Note1 Modulation Depth for idle Vmax=VwakeA, m(idle)
  • Page 71 August ’01 Chapter 4. Product Specification Data 4.2.4.15 Test Interface Parameter Sign Note Unit with respect to DG Pull-down Resistor, TCLK RTCLK kΩ 25 ºC with respect to DG Pull-down Resistor, TEN RTEN kΩ 25 ºC with respect to DG, Pull-down Resistor, TDAT RTDAT kΩ...

  • Page 72: Control Interface

    Analog Front End IC TMS37122 - Reference Guide August ’01 4.2.4.16 Control Interface Parameter Sign Note Unit Input capacitance WDEEN, MOD, TX VIL = 0 V, Low Level Input Current VBAT = 4 V VIH = 4 V, High Level Input Current VBAT = 4 V VBAT = 2 …...

  • Page 73: Pulse Position Demodulator

    August ’01 Chapter 4. Product Specification Data 4.2.4.18 Pulse Position Demodulator Parameter Sign Note Unit High Bit Detection cHdet Threshold Count (PPM) fRES = 134.2 kHz, High Bit Detection tHdet tHdet = cHdet / 59.6 µs Threshold Time (PPM) fRES 4.2.4.19 Electrostatic Discharge The component withstands the following electrostatic discharges at each pin: ±2 kV Human Body Model (MIL STD 883 compliant)