SL13A-AQFT

SL13A Smart Sensory Tag Chip For Unique Identification, Monitoring and Data Logging General Description The SL13A is a semi-active tag chip optimized for single-cell, battery-powered smart labels with sensor functionality. It also supports fully-passive operation without battery. The chip is ideal for applications using thin and flexible batteries but can also be powered from the RF field (electromagnetic waves from an RFID reader). The chip has a fully integrated temperature sensor with a nonlinearity of ±0.5ºC. The external sensor interface (SEXT ) is an analog input and allows the connection of an external sensor. Ordering Information and Content Guide appear at end of datasheet. Key Benefits & Features The benefits and features of SL13A, Smart Sensory Tag Chip For Unique Identification, Monitoring and Data Logging are listed below: Figure 1: Added Value of Using SL13A Benefits • Versatile data logging with selectable options • Logging storage capacity up to 762 events with time stamp Features • Programmable logging modes • High temperature range: -40°C to 110°C • On-chip 8k-bit EEPROM • Real-time clock (RTC) • On-chip temperature sensor • Supports data logging from various sensors • Analog input for resistive external sensor • Flexible supply options (1) • Fully passive mode: no battery • Semi-passive (BAP) mode: 1.5V or 3V battery • Provides supply for external circuitry • Energy harvesting from reader field providing up to 4mA @3.4V • Long battery life of >1 year (with 25 mAH printed battery) • Standby current (RTC running): 2 μATYP (@1.5V) • Operating current (logging, 20ms): 150 μATYP (@1.5V) • Works with NFC-enabled phones and HF RFID readers • ISO 15693 /NFC-V compliant • cool-Log™ supporting logging functions ams Datasheet [v1-07] 2015-Mar-10 Page 1 Document Feedback SL13A − General Description Benefits Features • Parameter setting via serial interface • SPI port (slave) with access to EEPROM • Precludes manipulation and unauthorized usage of data • Perpetual password-protected EEPROM access from reader • Works in multi-tag environment • Anti-collision capability • Flexible delivery form • 16-LD QFN (5x5 mm) • Tested wafer (8”) Note(s) and/or Footnote(s): 1. After battery is exhausted, the chip will continue working in passive mode (no RTC). Applications The SL13A applications include: • Monitoring and tracking of temperature-sensitive products • Temperature monitoring of medical products • Pharmaceutical logistics • Monitoring of fragile goods transportation Block Diagram The functional blocks of this device for reference are shown below: Page 2 Document Feedback ams Datasheet [v1-07] 2015-Mar-10 SL13A − General Description Figure 2: SL13A Block Diagram Energy Harvesting (up to 4 mA @3.4V) SL13A ANT1 Power Management 13.56 MHz AFE ISO 15693 8k-bit EEPROM VBAT VSS Battery optional ANT2 ANATEST VEXT Logging Logic Temperature Sensor External Sensor Input SEXT Register RTC FIFO CE Din Dout CLK ams Datasheet [v1-07] 2015-Mar-10 SPI Slave MUX 10-bit ADC Page 3 Document Feedback SL13A − Pin and Pad Layout Pin and Pad Layout The SL13A pin and pad layout is described below. VBAT 1 ANA-TEST 2 SEXT DOUT CLK NC Figure 3: QFN 16 Pinout 16 15 14 13 12 VSS 11 DIN SL13A VEXT 3 10 CE 5 6 7 8 ANT2 NC NC 9 ANT1 NC 4 NC Figure 4: Die Pad Layout Die Pad Layout The die size is 2.37mm x 2.24mm. All dimensions are in microns. Origin is on lower left corner of the chip, the values show the pad center position. Page 4 Document Feedback ams Datasheet [v1-07] 2015-Mar-10 SL13A − Pin and Pad Layout Figure 5: Pin Description Pin Number Pin Name 1 VBAT 2 ANA-TEST 3 VEXT Power output for external circuit (rectified RF voltage) 4 NC Not connected 5 ANT1 Antenna coil 6 ANT2 Antenna coil 7 NC Not connected 8 NC Not connected 9 NC Not connected 10 CE SPI enable input 11 DIN SPI data in 12 VSS Negative supply and ground 13 NC Not connected 14 CLK SPI clock 15 DOUT SPI data out 16 SEXT Analog input for external sensor. The input voltage range is 0.3V to 0.6V ams Datasheet [v1-07] 2015-Mar-10 Description Battery input Analog test output Page 5 Document Feedback SL13A − Absolute Maximum Ratings Absolute Maximum Ratings Stresses beyond those listed under “Absolute Maximum Ratings” 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 under Operating Conditions is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Figure 6: Absolute Maximum Ratings Parameter Input Voltage Range Min Max Unit -0.3 3.7 V 1 A Maximum Current V EXT, ANT1, ANT2 ESD Rating, HBM ±2 Maximum Operating Virtual Junction Temperature, TJ Storage Temperature Range, Tstg -65 Package Body Temperature, Tbody Operating Conditions All voltage values are with respect to substrate ground terminal V SS kV 150 °C 150 °C 260 Moisture Sensitivity Level (MSL) Note Norm: IPC/JEDEC J-STD-020 The reflow peak soldering temperature (body temperature) is specified according IPC/JEDEC J-STD-020 “Moisture/Reflow Sensitivity Classification for Non-hermetic Solid State Surface Mount Devices”. °C Represents a maximum floor life time of 168h 3 (Operating free–air temperature range) Figure 7: Operating Conditions Symbol Parameter Min Typ Max Unit V BAT Input Supply Voltage 1.2 1.5 3.3 V TA Operating ambient temperature range -40 110 °C Page 6 Document Feedback ams Datasheet [v1-07] 2015-Mar-10 SL13A − Electrical Characteristics Electrical Characteristics TA = 0°C to 85°C, VBAT = 1.5V, EN = V BAT, R LOAD = ∞, unless otherwise noted. Typical values are at TA = 35°C. (2) Figure 8: Electrical Characteristics Symbol Parameter Conditions Min 1.2 VBAT Operating Input Voltage TA = 35°C VBAT(SU) Minimum Start-Up Input Voltage TA = 35°C IBAT-OP Operating Current into VBAT Sensor and A/D converter active IBAT-SD Shutdown Current into VBAT VBAT = 1.5V; TA = 35°C Output Voltage see note (1) VEXT Typ Max Unit 3.3 V 1.3 100 3.2 V 150 300 μA 100 500 nA 3.4 3.5 V IEXT Maximum Current, External When RF field is present, from the VEXT pin VIL Input Voltage Threshold, Low CE, SCLK, SDATA Vss-0.3 Vss+0.3 V VIH Input Voltage Threshold, High CE, SCLK, SDATA VBAT – 0.3 VBAT + 0.3 V VOL Output Voltage level, Low DIGI_OUT Vss-0.3 Vss+0.3 V VOH Output Voltage level, High DIGI_OUT VBAT – 0.3 VBAT + 0.3 V VS-EXT Sensor Input Voltage Range SEXT 0.3 0.6 V RIN-EXT Sensor Input Impedance SEXT fc Carrier Frequency 4 mA 1 13.553 13.56 MΩ 13.567 MHz TS-R Temperature Sensor Range -20 60 ºC TE-R Extended temperature sensor range -40 74 ºC TS-O Temperature Sensor Offset at 35°C -0.6 0.6 ºC TS-GN Temperature Sensor Gain and nonlinearity error tRTC-I Real-Time Clock, Interval tRTC-AT Real-Time Clock, Accuracy at 35°C ams Datasheet [v1-07] 2015-Mar-10 One-point calibration at 35°C (3) ºC ±0.5 Programmable 1 32,768 Sec see note (4) -0.5 +0.5 % Page 7 Document Feedback SL13A − Electrical Characteristics Symbol Parameter Conditions Min Typ Max Unit +3 % tRTC-AF Real-Time Clock, Accuracy over the specified temperature range EWCYC EEPROM Erase/Write Cycles T = 25°C 10,000 Cycles tDR EEPROM Data Retention Time T = 55°C 10 Years tE/W EEPROM Erase/Write Time TA =0ºC to 55°C 4 tADC ADC Conversion Time CT Internal Tuning Capacitor -3 6 8 ms see note (5) 7 ms Between ANT1 and ANT2 pins 25 pF Note(s) and/or Footnote(s): 1. VEXT is rectified RF voltage, for power supply of external circuits. It is limited to 3.4V, when enough signal is present on the coil. The maximum output current is 5mA and is dependent on the strength of the RF field. 2. Limits are 100% production tested at TA = 35°C. Limits over the operating temperature range are guaranteed by design. 3. During calibration on wafer sort, the chuck temperature variation is ±0.5°C, which amounts to the major part of the accuracy error. 4. The real time oscillator frequency is trimmed on wafer sort at 35°C. 5. The conversion time includes the ADC setup time. Page 8 Document Feedback ams Datasheet [v1-07] 2015-Mar-10 SL13A − Detailed Description Detailed Description The SL13A is designed for use in smart active labels (SAL) and smart passive labels. Smart active labels are defined as thin and flexible labels that contain an integrated circuit and a power source. SAL includes in its definition both “fully active” smart labels, and semi-active smart labels, also known as battery-assisted back-scattered passive labels, both of which enable enhanced functionality and superior performance over existing passive labels. The SL13A can be used in semi-active or fully-passive smart labels. The IC includes sensor functionality and logging of sensor data (see Figure 1 below). The SL13A is operating at 13.56 MHz and is fully ISO 15693 compliant. The chip is supplied from a single-cell battery of typically 1.5V. The on-chip temperature sensor and real-time clock (RTC) accommodate temperature data logging. Supply Arrangement The SL13A is supplied from either the battery or through the electromagnetic waves from a reader. The device is normally supplied from the battery unless the battery voltage is too low - in this case the device is powered from the RF field. This functionality enables the read out of the log data even in case the battery is exhausted. The chip automatically detects whether a 1.5V or 3V battery is connected and adapts accordingly. The voltage step-up converter provides an input voltage for the voltage regulator, which provides a regulated voltage of 2V nominal (internal digital supply). The maximum current available from V EXT for external circuitry is 4mA (only when RF field is present) and is limited to 3.4V. Analog Front End (AFE) The analog front end is designed for 13.56 MHz according to ISO 15693. The incoming data are demodulated from the received ASK (Amplitude Shift Keying) signal which is 10 ~ 30% or 100% modulated. Outgoing data are generated by the SL13A load variation using Manchester coding with one or two sub-carrier frequencies of 423.75 KHz (f c/32) or 484.28 KHz (fc/28). The SL13A is compliant with the ISO 15693 recommendation for radio frequency power and signal interface. ams Datasheet [v1-07] 2015-Mar-10 Page 9 Document Feedback SL13A − Detailed Description Processing and Digital Control The SL13A is fully ISO 15693 compliant. Both data coding modes (1 out of 256 and 1 out of 4) are supported by the SL13A. The reader (interrogator) makes mode selection within the SOF (Start of Frame). The 1-of-256 data coding mode has a data rate of 1.65 kbit/s (fc/8192) meaning that the transmission of one byte takes 4.833 ms. The 1-of-4 coding has a rate of 26.48 kbit/s (fc/512) with the transmission of one byte taken 302.08 μs. Figure 9: Response Data Rate Data Rate One Sub-carrier Two Sub-carrier Low 6.62 kbit/s (fc/2048) 6.67 kbit/s (fc/2032) High 26.48 kbit/s (fc/512) 26.69 kbit/s (fc/508) Serial Interface (SPI) The integrated serial interface (SPI) can be used to read and write the embedded EEPROM and to set the parameters. The SPI interface is a secondary and test interface - the main interface is the RF ISO15693 interface. Real-Time Clock (RTC) The on-chip real-time clock (RTC) is started through the START- LOG command in which the start time is programmed in UTC format. The interval for sensing and data logging can be programmed in the range from 1 second up to 9 hours. The accuracy of the timer is ±3%. Temperature Sensor The on-chip temperature sensor can measure the temperature in the range from -20ºC to 60ºC within the specified accuracy. The reference voltage for the A/D conversion is supplied from an on chip calibrated Bandgap reference. External Sensor The external sensor pin (S EXT ) can be used to connect an external sensor to the A/D converter. The voltage input range is 300mV – 600mV and is fixed. For extra low power applications the CE pin can switch the battery voltage for the time of the external sensor A/D converter, so the current from the battery into the sensor will flow only for this short time (max 5ms). This can be enabled when the External-sensor flag is set to 1 and the bit 19 in the Internal calibration data is set. Page 10 Document Feedback ams Datasheet [v1-07] 2015-Mar-10 SL13A − Detailed Description A/D Converter An integrated 10-bit dual slope converter is used for the temperature, battery and external sensor voltage conversions. EEPROM Organization and Security The EEPROM is organized into 3 areas - the System area, User area and Measurement area. The System area has a fixed size and can be accessed only by the proprietary commands. It is protected by the Level 1 password - the System password. The User and Measurement areas reside in the same address space (256 blocks), but have separated passwords - the User password and the Measurement password. The User and Measurement are can be accessed by the standard ISO15693 read and write commands. The User area size can be set by the Initialize command. The minimum User area size is 1 block, the maximum is 256 blocks. The size of the Measurement area is 256 blocks minus User area. All blocks are 32 bits wide. The password protection restricts only the write-type commands. Read commands are always open. The password protection can be activated for every area individually by writing a value not equal to 0 to the password blocks. The chip also supports a One-time use secure mode. When this mode is used, all Measurement blocks are automatically locked by the chip with the Start Log command. Those blocks cannot be unlocked anymore even if the Level 3 (measurement) password is known. This mode is intended for high security applications where the 32-bit password does not provide enough confidence. Fully Passive Operation The chip can be used in fully passive mode without a battery supply. In this mode all functions are active only when the antenna is in a RF field. For extended operation range in fully passive mode, connect a 2.2μF capacitor between the VEXT and V SS pins. The chip can be used also without this capacitor. ams Datasheet [v1-07] 2015-Mar-10 Page 11 Document Feedback SL13A − Functional Description Functional Description Figure 11 shows the command overview. Figure 14 shows the different states and their interactions. Initializing the Chip A virgin chip (not initialized) can be initialized either through the SPI bus or through the electromagnetic field from a reader in the standby mode. The power source is either from a battery (V BAT ) or extracted from the RF field via the AFE circuit. After the initializing procedure, the chip will enter the ready mode. If the External-Sensor flag is set, an external analog output sensor can be connected to the S EXT pin. Ready State In the ready mode, all parameters can be set, read and changed through a reader with the appropriate passwords. Active State In active mode, the real-time clock (RTC) is running, the desired parameters are set and the on-chip temperature sensor is in standby. Logging State A log flag from the timer will enable the logging mode in which the sensor and the A/D converter will be activated, and the measured value will be stored in the EEPROM together with the time of the event. If the External Sensor flag is set, the external sensor will also be activated and the measured data stored. The A/D converter can be multiplexed between internal temperature sensor, external sensor or battery voltage. After the event, the chip will return to the active mode. During the time of the logging procedure, the chip will not be able to receive any RF command. If an RF command is sent during this time, the chip will ignore it and will not send any reply. Page 12 Document Feedback ams Datasheet [v1-07] 2015-Mar-10 SL13A − Functional Description Passive State In passive mode, the chip waits for the presence of an RF field or for CE signal to go high. Current consumption from the battery in passive mode is