Pressure sensors Barometric pressure transmitters for SMT Series/Type: Ordering code: ASB series Date: Version: 2011-05-02 2.2 Content of header bars 1 and 2 of data sheet will be automatically entered in headers and footers! Please fill in the table and then change the color to "white". This ensures that the table disappears (invisible) for the customer PDF. Don't change formatting when entering or pasting text in the table and don't add any cell or line in and to it! Identification/Classification 1 (header 1 + top left bar): Pressure sensors Identification/Classification 2 (header 2 + bottom left header bar): Barometric pressure transmitters for SMT Ordering code: (top right header bar) Series/Type: (top right header bar) ASB series Preliminary data (optional): (if necessary) Preliminary data Department: AS SEN PD Date: 2011-05-02 Version: released / signed: PD 2.2 released / signed: PM released / signed: QM released / signed: PPE EPCOS AG 2009. Reproduction, publication and dissemination of this publication, enclosures hereto and the information contained therein without EPCOS' prior express consent is prohibited Pressure sensors Barometric pressure transmitters for SMT ASB series Preliminary data Description Pressure sensor transmitters based on piezoresistive silicon pressure dies On board compensation circuit for non-linearity and temperature error Miniaturized SMD hybrid package (4.3mm x 4.3mm x 2.4mm) Features Analog ratiometric interface with adjustable output limits (clipping) or digital 14 bit I²C interface Diagnosis functions like loss of Vdd/Vss, bridge connections and short cuts High immunity against electromagnetic influences Plastic free surface mount technology for reflow soldering Conforming to RoHS Directive Options Other output characteristics and / or rated pressure ranges upon request Table of Contents 1. Technical Data .........................................................................................................3 2. Analog Output (VR/V1) ............................................................................................4 3. Digital Output – I²C (D5) ..........................................................................................5 4. Total Error (Temperature Error Multiplier) ................................................................9 5. Board Layout (Recommendation) .............................................................................9 6. Reliability Testing ...................................................................................................10 7. Product Key............................................................................................................11 8. Ordering Codes ......................................................................................................11 9. Packaging...............................................................................................................12 10. Reflow Soldering ....................................................................................................13 Symbols and terms........................................................................................................14 Cautions and warnings ..................................................................................................15 AS SEN PD Please read Cautions and warnings and Important notes at the end of this document. 2011-05-02 Page 2 of 16 Pressure sensors Barometric pressure transmitters for SMT ASB series Preliminary data 1. Technical Data Absolute maximum ratings Parameter Symbol Conditions Min. Max. Unit Tst 1) Temperature ranges Storage temperature range Operating temperature range Top Tc Soldering temperature Tsolder +125 °C -40 +85 °C 2) -40 +125 °C 0 +70 °C +260 °C TN TE Compensated temperature range -40 2) 3),4) Pressure ranges Rated pressure Overpressure pr absolute 0.2 (2.9) pov 4), 5) 2 pr 3 pr Burst pressure 1.2 (17.4) bar (psi) Supply voltage /-current Supply voltage Vsupply Supply current Isupply Signal output current Start up time 6) 5.5 V Iout = 0 2.5 mA Iout 7) 2 mA tSTA 8) 10 ms AS SEN PD Please read Cautions and warnings and Important notes at the end of this document. 2.7 2011-05-02 Page 3 of 16 Pressure sensors Barometric pressure transmitters for SMT ASB series Preliminary data 2. Analog Output (VR/V1) Parameter Symbol Conditions Min. Typ. Max. Unit Analog output signal (VR/V1) @ Top = 25°C, Vsupply = 5 V, Iout < 0.1 mA Offset (at pr,min) Vout,0 VR: ratiometric V1: 0 … 1000 mV VR: ratiometric Signal span (Full Scale) 9) V1: 0 … 1000 mV Vout,0 + VFS 10) 9), 10) 10 %VCC 2.5 mV 80 %VCC 1000 mV 90 %VCC enabled upon request Diagnostic levels Non-linearity Response time Resolution Basic accuracy Terminal assignment disabled 10), 11) L Simple output ±0.1 % FS t10-90 12) 2 ms rOUT 13) 12 bit Top: 0 … 70°C ±2 ±3 % FS Dimensional drawings Pin Symbol Signal 1 2 3 4 not connected Ground Output signal Supply voltage GND Vout Vsupply VR: ratiometric 0 10) VFS Full scale output at pr,max 9) Output Characteristics Application Circuit Vout,min + VFS Vsupply Vout,min pr,min 2 3 1 4 Vout pr,max Conversion Formula − pr ,min ) Vmeas ⋅ − Vout ,min + p r ,min VFS VSupply ( p r ,max − pr ,min ) = ⋅ (Vmeas − Vout ,min ) + p r ,min VFS VR: p meas = V1 p meas (p r , max AS SEN PD Please read Cautions and warnings and Important notes at the end of this document. 0.1µF GND 2011-05-02 Page 4 of 16 Pressure sensors Barometric pressure transmitters for SMT ASB series Preliminary data 3. Digital Output – I²C (D5) Parameter Symbol Conditions Min. Typ. Max. Unit Digital output pressure signal (D5) @ Top = 25°C, Vsupply = 5 V, Iout < 0.1 mA P out,0 D5: I²C - 14bit 1638 digits D5: I²C - 14bit 13107 digits D5: I²C - 14bit 14745 digits ±0.1 % FS Offset (at pr,min) D Signal span (Full Scale) P D FS Full scale output at pr,max D Non-linearity L Simple output t10-90 12) Response time P out,0 + D P FS 10), 11) 2 ms ±2 Basic accuracy ±3 % FS Digital output temperature signal (D5) @ pr,min , Vsupply = 5 V, Iout < 0.1 mA Offset (at 0°C) Sensitivity Basic accuracy D T D T out,0 D5: I²C - 11bit 512 S D5: I²C - 11bit 10.235 Top: 0 … 70°C ±2 digits digits/K ±3 °C Configuration, digital interface System clock frequency 10 6 Hz Update period 1.5 ms I C address 0x28 hex Sensor connection check active Sensor short check active Sleep Mode active 2 Terminal assignment Pin Symbol Signal 1 GND 2 Vsupply voltage 3 SDA 4 SCL Ground Supply Dimensional drawings Serial Data Serial Clock AS SEN PD Please read Cautions and warnings and Important notes at the end of this document. 2011-05-02 Page 5 of 16 Pressure sensors Barometric pressure transmitters for SMT ASB series Preliminary data Output Characteristics Application Circuit Vsupply Dpout,min + DFS pressure: 2 3 SDA 1 4 SCL Dpout,min pr,min 0.1µF pr,max 2047 digits temperature: GND 512 digits 0 digits -50°C 0°C 150°C Conversion Formula (p pressure: p meas = temperature: Tmeas [°C ] = r , max − p r ,min ) p DFS ( ) p p ⋅ Dmeas − Dout , min + p r , min T Dmeas − 512 10.235 Sleep Mode After the command window, the sensor’s signal processor will power down and fall into sleep mode. To wake up the sensor’s signal processor the master must send a Read_MR (measurement request operation) command or a Write_MR (reduced measurement request operation) command. After completion of the measurement cycle the data can be transmitted via a data fetch operation and the sensor’s signal processor will power down and fall into sleep mode again. POR I²C measurement request operation (Read_MR) Sensor‘s Digital Signal Processor Activity Appr. 4.42 ms Command Window Temperature Pressure Measurement Measurement Power Down DSP Calcs. Write New Data To Output Register reserved Power ON Wakes Sensor‘s Signal Processor Wakes Sensor‘s Signal Processor Serial Interface Activity Read_MR Read_DF Read_DF Invalid Values Sensor‘s Digital Signal Processor Activity POR I²C reduced measurement request operation (Write_MR) Temperature Measurement Power Down Command Window Read_MR Valid Reading Appr. 1.62 ms Pressure Measurement Power Down DSP Calcs. Write New Data To Output Register reserved Power ON Serial Interface Activity Wakes Sensor‘s Signal Processor Write_MR Wakes Sensor‘s Signal Processor Read_DF Invalid Values AS SEN PD Please read Cautions and warnings and Important notes at the end of this document. Temperature Measurement Power Down Read_DF Read_MR Valid Reading 2011-05-02 Page 6 of 16 Pressure sensors Barometric pressure transmitters for SMT ASB series Preliminary data I²C measurement request operation (Read_MR) The Read_MR command forces the sensor to wake up from sleep mode and to perform a complete measurement and calculation cycle. The Read_MR command is only containing the slave address and the READ bit (HIGH state) both sent by the master. After the sensor responds with the slave ACK, the master must create a stop condition. S Start Condition S 6 5 4 3 2 1 0 R A S A Acknowledge (ACK) Device Slave Address (0x28h) Device Slave Address [0:6] S Stop Condition R Read Bit (HIGH) Wait for Slave ACK I²C reduced measurement request operation (Write_MR) The Write_MR command forces the sensor to wake up from sleep mode and to perform only a pressure measurement and calculation cycle. (Please Note: Obsolete, maybe invalid, temperature data is used to calculate the pressure data. For using updated temperature data, please use the I²C measurement request operation – Read_MR) The Write_MR command is faster then the Read_MR command, but perhaps results are insufficient. The Write_MR command is only containing the slave address and the WRITE bit (LOW state) both sent by the master. After the sensor responds with the slave ACK, the master must create a stop condition. S Start Condition S 6 5 4 3 2 1 0 W A S A Acknowledge (ACK) Device Slave Address (0x28h) Device Slave Address [0:6] S Stop Condition W Write Bit (LOW) Wait for Slave ACK I²C data fetch operations th For data fetch operations, the I²C master must start with the 7bit slave address (0x28h) with the 8 bit high (READ request). The sensor (I²C slave node) sends an acknowledge (ACK) indicating success. The sensor sends up to 4 data bytes depending on the master’s NACK. S 6 5 4 3 2 1 0 R A 15 14 13 12 11 10 9 8 A 7 6 5 4 3 2 1 0 A 10 9 8 7 6 5 4 3 A 2 1 0 x x x x x N S Pressure Data [13:8] Device Slave Address [0:6] Wait for Slave ACK S Start Condition Device Slave Address (0x28h) Master ACK Pressure Data [7:0] Temperature Data [10:3] Master ACK R Read Bit Status Bit A Acknowledge (ACK) Pressure Data AS SEN PD Please read Cautions and warnings and Important notes at the end of this document. x T. Data [2:0] reserved Master ACK Master NACK Temperature Data N reserved S Stop Condition No Acknowledge (NACK) 2011-05-02 Page 7 of 16 Pressure sensors Barometric pressure transmitters for SMT ASB series Preliminary data I²C Status Bits The sensor offers a full siute of diagnostic features to ensure robust system operation. The diagnostic states are indicated by a transmission of the status of the 2 MSBs of the pressure high byte data. Status Bits 00 01 10 11 Definition Normal operation, good (fresh) data packet Reserved Stale data: Data that has already been fetched since the last measurement cycle Internal error occured I²C data fetch example S 0 1 0 1 0 0 0 1 A 0 0 0 0 0 1 1 0 A 0 1 1 0 0 1 1 0 A 0 1 0 1 1 0 0 1 A 1 0 1 x x x x x N S Device Slave Address 0x28h Pressure Data 00011001100110 = 0x666h = 1638d 0 mbar (rel.) Temperature Data 01011001101 = 0x2CDh = 717d 20°C Status Bits 00 normal operation, fresh data package S Start Condition Device Slave Address (0x28h) R Read Bit Status Bit A Acknowledge (ACK) Pressure Data x Temperature Data N No Acknowledge (NACK) reserved S Stop Condition I²C protocol limitations Please note: • Sending a start-stop condition without any transition on the CLK line (no clock pulses in between) creates a communication error for the next communication, even if the next start condition is correct and the clock pulse is applied. An additional start condition must be sent, which results in restoration of proper communication. • The restart condition – a falling SDA edge during data transmission when the CLK line is still high – creates the same situation. The next communication fails, and an additional start condition must be sent for correct communication. • A falling SDA edge is not allowed between the start condition and the first rising SCL edge. If using an I²C address with the first bit 0, SDA must be held low from the start condition through the first bit. • If a data fetch is performed before or during the first measurement after power-on reset (POR), the fetched data is invalid, even though the status bits report it as “valid” or “stale”. AS SEN PD Please read Cautions and warnings and Important notes at the end of this document. 2011-05-02 Page 8 of 16 Pressure sensors Barometric pressure transmitters for SMT ASB series Preliminary data 4. Total Error (Temperature Error Multiplier) The output accuracy over the whole temperature range can be calculated by multiplying the basic accuracy with a temperature dependant factor as shown in the following graph. Temperature error multiplier 2,0 1,9 1,8 1,7 1,6 1,5 Temperature error multiplier 1,4 1,3 1,2 1,1 1,0 0,9 0,8 0,7 0,6 0,5 0,4 0,3 0,2 0,1 125 120 115 110 105 95 100 90 85 80 75 70 65 60 55 50 45 40 35 30 25 20 15 5 10 0 -5 -10 -15 -20 -25 -30 -35 -40 0,0 Temperature [°C] 5. Board Layout (Recommendation) AS SEN PD Please read Cautions and warnings and Important notes at the end of this document. 2011-05-02 Page 9 of 16 Pressure sensors Barometric pressure transmitters for SMT ASB series Preliminary data 6. Reliability Testing Performed Tests: Test Standard Early Life Failure Rate (ELFR) following to AEC-Q100-008 Test conditions - Storage for 24h at +105°C Preconditioning (PC) following to AEC-Q100, JEDEC J-STD-020 and JEDEC JESD22-A113 - Parts from ELFR test - 5 cycles shipping conditions (-40°C to +60°C) - Bake 24h at +125°C - Soak 192h at +30°C and 60% r.h. - Apply 3 reflow soldering cycles High Temperature Storage Life (HTSL) following to AEC-Q100 and JEDEC JESD22-A103 - Parts from PC test - Storage for 1000h at +125°C - Unpowered High Temperature Operating Life (HTOL) following to AEC-Q100 and JEDEC JESD22-A108 - Parts from ELFR test - Operating for 408h at +105°C - Powered with Vsupply at +5VDC Variable Frequency Vibration Test (VFV) following to AEC-Q100 and JEDEC JESD22-B103 - Parts from ELFR test - Logarithmic sweep from 20Hz to 2KHz to 20Hz within 4min - Max. acceleration at 50g - 4 x 4min in each orientation (total 144min) Mechanical Shock Test (MS) following to AEC-Q100 and JEDEC JESD22-B104 - Parts from ELFR test - 5 pulses with 1,500g peak acceleration in positive vertical direction - Peak duration 0.5ms Pressure Cycle Test (Internal standard) - Parts from ELFR test - 1,000,000 pressure cycles between minimum rated pressure (pr,min) and overpressure (pov) - Test performed at room temperature Test Criterion: All sensors have to be within the specified tolerances before and after each test listed below. AS SEN PD Please read Cautions and warnings and Important notes at the end of this document. 2011-05-02 Page 10 of 16 Pressure sensors Barometric pressure transmitters for SMT ASB series Preliminary data 7. Product Key AS B 1.200 VR TN H19 KXXXX Customer Specific Index Optional, reserved Pressure Feed Reserved Operating Temperature Range TN TE Normal Temperature Range (-40°C … +85°C) Extended Temperature Range (-40°C … +125°C) Output signal VR V1 D5 0.1 ... 0.9 V/V (ratiometrical) 0 ... 1 V I²C (pressure 14 bit / temperature 11 bit) Rated pressure range 1.200 bar (17.4 psi) Measuring type B Barometric (Absolute) Sensor type AS Advanced Surface Mount Technology 8. Ordering Codes Rated Pressure pr [bar] ([psi]) Normal Temperature Range Ratiometric 0..1000 mV I²C (14 bit) Extended Temperature Range Ratiometric 0..1000 mV I²C (14 bit) 1.200 n/n n/n n/n n/n n/n n/n (17.4) (ASB 1.200 VR TN H19) (ASB 1.200 V1 TN H19) (ASB 1.200 D5 TN H19) (ASB 1.200 VR TE H19) (ASB 1.200 V1 TE H19) (ASB 1.200 D5 TE H19) AS SEN PD Please read Cautions and warnings and Important notes at the end of this document. 2011-05-02 Page 11 of 16 Pressure sensors Barometric pressure transmitters for SMT ASB series Preliminary data 9. Packaging Packaging for samples is separated in ESD bags and ESD box. (Tape and reel packaging acc. to IEC 60286-3 will be defined.) AS SEN PD Please read Cautions and warnings and Important notes at the end of this document. 2011-05-02 Page 12 of 16 Pressure sensors Barometric pressure transmitters for SMT ASB series Preliminary data 10. Reflow soldering Recommended temperature characteristic for reflow soldering following JEDEC J-STD-020D Profile feature Sn-Pb eutectic assembly Pb-free assembly Preheat and soak - Temperature min Tsmin 100 °C 150 °C - Temperature max Tsmax 150 °C 200 °C - Time tsmin to tsmax 60 … 120 s 60 … 180 s Average ramp-up rate Tsmax to Tp 3 °C/s max. 3 °C/s max. Liquidous temperature TL 183 °C 217 °C Time at liquidous tL Peak package body temperature Tp 60 … 150 s A) 220 °C … 235 °C 3) Time (tp) within 5 °C of specified classification temperature (Tc) Average ramp-down rate Time 25 °C to peak temperature 20 s Tp to Tsmax C) 60 … 150 s B) 245 °C … 260 °C 30 s B) C) 6 °C/s max. 6 °C/s max. maximum 6 min maximum 8 min A) Tolerance for peak profile temperature (Tp) is defined as a supplier minimum and a user maximum. B) Depending on package thickness. For details please refer to JEDEC J-STD-020D. C) Tolerance for time at peak profile temperature (tp) is defined as a supplier minimum and a user maximum. AS SEN PD Please read Cautions and warnings and Important notes at the end of this document. 2011-05-02 Page 13 of 16 Pressure sensors Barometric pressure transmitters for SMT ASB series Preliminary data Symbols and terms 1) 2) 3) 4) 5) 6) 7) 8) 9) 10) 11) Storage temperature range Tst A storage of the pressure sensor within the temperature range Tst,min up to Tst,max and without applied pressure and supply voltage will not affect the performance of the pressure sensor. Operating temperature range Top An operation of the pressure sensor within the temperature range Top,min up to Top,max will not affect the performance of the pressure sensor. Compensated temperature range Tc While operating the pressure sensor within the temperature range Tc,min up to Tc,max, the deviation of the output signal from the values at 25 °C will not exceed the temperature coefficients. Out of the compensated temperature range, the deviations may increase. Rated pressure pr Within the rated pressure range 0 up to pr,max the signal output characteristic corresponds to this specification. Overpressure pOV Pressure cycles within the pressure range 0 up to pov will not affect the performance of the pressure sensor. Supply voltage Vsupply Vsupply,max is the maximum permissible supply voltage, which can be applied without damages. Vsupply,min is the minimum required supply voltage, which has to be applied for normal operation. Signal output current IA IA,max is the maximum permissible sink current of the signal output. Exceeding (e.g. short circuit) may cause irreparable damages. Start up time tSTA Time between the start up of the normal operation after power on and the first valid output signal. Offset Vout,0 The offset Vout,0 is the signal output VA(p = 0) at zero pressure. Signal span (Full Scale) Simple output: VFS = FS = Vout(pr,max) – VA0 Non-linearity L (including pressure hysteresis) The non-linearity is the deviation of the real sensor characteristic VA = f(p) from the ideal straight line. It can be approximated by a polynomial of second order, with the maximum at px = pr / 2 . The equation to calculate the non-linearity is: L= 12) 13) Vout ( p x ) − Vout , 0 p x − Vout ( pr ) − Vout , 0 pr Response time t10-90 Delay between a pressure change (10 ... 90% pr) and the corresponding signal output change (10 ... 90% FS). Resolution rOUT The resolution of the output DAC (digital/analog converter). For ratiometric output only 80% of DAC range is used. AS SEN PD Please read Cautions and warnings and Important notes at the end of this document. 2011-05-02 Page 14 of 16 Pressure sensors Barometric pressure transmitters for SMT ASB series Preliminary data Cautions and warnings Storage The pressure sensors should be stored in their original packaging. They should not be placed in harmful environments such as corrosive gases nor exposed to heat or direct sunlight, which may cause deformations. Similar effects may result from extreme storage temperatures and climatic conditions. Avoid storing the pressure sensors in an environment where condensation may form or in a location exposed to corrosive gases, which will adversely affect their performance. Soldering The thermal capacity of the pressure sensor is normally low, so steps should be taken to minimize the effects of external heat. High temperatures may lead to damage or changes in characteristics. A no-clean flux should normally be used. Flux removal processes are not recommended. Avoid rapid cooling due to dipping in solvent. Note that the output signal may change if pressure is applied to the terminals during soldering. Operation Media compatibility with the pressure sensors must be ensured to prevent their failure (see page 2). The use of other media can cause damage and malfunction. Never use them in atmospheres containing explosive liquids or gases. Ensure pressure equalization to the environment, if relative pressure sensors are used. Avoid operating the pressure sensors in an environment where condensation may form or in a location exposed to corrosive gases. These environments adversely affect their performance. If the operating pressure is not within the rated pressure range, it may change the output characteristics. Be sure that the applicable pressure does not exceed the overpressure, it may damage the pressure sensor. Do not exceed the maximum rated supply voltage, it may damage the pressure sensor. Do not exceed the rated storage temperature range, it may damage the pressure sensor. Temperature variations in both the ambient conditions and the media (liquid or gas) can affect the accuracy of the output signal from the pressure sensors. Be sure to check the operating temperature range and thermal error specification of the pressure sensors to determine their suitability for the application. Connections must be wired in accordance with the terminal assignment specified in this publication. Care should be taken as reversed pin connections can damage the pressure sensors or degrade their performance. Contact between the pressure sensor terminals and metals or other materials may cause errors in the output characteristics. This listing does not claim to be complete, but merely reflects the experience of EPCOS AG. AS SEN PD Please read Cautions and warnings and Important notes at the end of this document. 2011-05-02 Page 15 of 16 Important notes The following applies to all products named in this publication: 1. Some parts of this publication contain statements about the suitability of our products for certain areas of application. These statements are based on our knowledge of typical requirements that are often placed on our products in the areas of application concerned. We nevertheless expressly point out that such statements cannot be regarded as binding statements about the suitability of our products for a particular customer application. As a rule, EPCOS is either unfamiliar with individual customer applications or less familiar with them than the customers themselves. For these reasons, it is always ultimately incumbent on the customer to check and decide whether an EPCOS product with the properties described in the product specification is suitable for use in a particular customer application. 2. We also point out that in individual cases, a malfunction of electronic components or failure before the end of their usual service life cannot be completely ruled out in the current state of the art, even if they are operated as specified. In customer applications requiring a very high level of operational safety and especially in customer applications in which the malfunction or failure of an electronic component could endanger human life or health (e.g. in accident prevention or life-saving systems), it must therefore be ensured by means of suitable design of the customer application or other action taken by the customer (e.g. installation of protective circuitry or redundancy) that no injury or damage is sustained by third parties in the event of malfunction or failure of an electronic component. 3. The warnings, cautions and product-specific notes must be observed. 4. In order to satisfy certain technical requirements, some of the products described in this publication may contain substances subject to restrictions in certain jurisdictions (e.g. because they are classed as hazardous). Useful information on this will be found in our Material Data Sheets on the Internet (www.epcos.com/material). Should you have any more detailed questions, please contact our sales offices. 5. We constantly strive to improve our products. Consequently, the products described in this publication may change from time to time. The same is true of the corresponding product specifications. Please check therefore to what extent product descriptions and specifications contained in this publication are still applicable before or when you place an order. We also reserve the right to discontinue production and delivery of products. Consequently, we cannot guarantee that all products named in this publication will always be available. The aforementioned does not apply in the case of individual agreements deviating from the foregoing for customer-specific products. 6. Unless otherwise agreed in individual contracts, all orders are subject to the current version of the “General Terms of Delivery for Products and Services in the Electrical Industry” published by the German Electrical and Electronics Industry Association (ZVEI). 7. The trade names EPCOS, BAOKE, Alu-X, CeraDiode, CSMP, CSSP, CTVS, DSSP, MiniBlue, MKK, MLSC, MotorCap, PCC, PhaseCap, PhaseCube, PhaseMod, SIFERRIT, SIFI, SIKOREL, SilverCap, SIMDAD, SIMID, SineFormer, SIOV, SIP5D, SIP5K, ThermoFuse, WindCap are trademarks registered or pending in Europe and in other countries. Further information will be found on the Internet at www.epcos.com/trademarks. Page 16 of 16