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| MS7812 PRESSURE SENSOR DIE (0-12 BAR) * 0 to 1200 kPa range (1 bar or 174 PSI) * Absolute/differential pressure sensors * RoHS-compatible & Pb-free1 DESCRIPTION The sensor element of the MS7812 consists of a silicon micro-machined membrane with a Pyrex glass mounted under vacuum. Implanted resistors make use of the piezo-resistive effect. The absolute pressure sensor (MS7812-A) carries a sealed vacuum reference cavity underneath the membrane whereas the differential sensor (MS7812-D) has a whole in the Pyrex glass at the backside of the sensor. FEATURES * * * Uncompensated pressure sensor die Output Span 150mV @ 5V Temperature Range -40 ...+125 C * * * Linearity 0.05% (typical) Small Die Size 2.00 x 1.86mm Low Cost, High reliability APPLICATION * * * For absolute or differential pressure sensor systems Engine controls Dive computers ELECTRICAL CONNECTIONS Positive output for pressure applied topside Vs+ EPI Vs+ : Supply voltage of Wheatstone bridge Epi : Connection of epitaxial layer (membrane) Out+ OutOut- : Negative output Out+ : Positive output GND1 : Ground GND2 : Ground GND1 GND2 1 The European RoHS directive 2002/95/EC (Restriction of the use of certain Hazardous Substances in electrical and electronic equipment) bans the use of lead, mercury, cadmium, hexavalent chromium and polybrominated biphenyls (PBB) or polybrominated diphenyl ethers (PBDE). 00007812351 ECN 743 DA7812_003.doc May 05th, 2005 1/4 PAD OUT Vs+ Epi OutImportant remarks: MS7812 As the sensing elements are diffused resistances, the voltage applied on the ground pads (GND1 and GND2) has to be lower than the voltage applied on supply voltage pad (Vs+). The epitaxial layer is connected to the Vs+ pin on the die Out+ GND1 GND2 LAYOUT MS7812A MS7812D Bondable area = 100 x 100 m DA7812_003.doc May 05th, 2005 Bondable area = 100 x 100 m 2/4 00007812351 ECN 743 FULL SCALE PRESSURE kPa 1200 bar 12 mbar 12000 PSI 174 atm 11.8 mm Hg 9001 m H2O 122 Inches H2O 4818 ABSOLUTE MAXIMUM RATINGS Parameter Supply voltage Storage temperature Pressure overload Symbol VS+ TS Ta = 25 C -40 o Conditions Min Max 20 +125 30 Unit V C Bar o ELECTRICAL CHARACTERISTICS (Reference conditions: Supply Voltage VS+ = 5 Vdc; Ambient Temperature Ta = 23 ) C Parameter Operating Pressure Range Bridge Resistance Full-scale span (FS) Zero Pressure Offset Linearity Hysteresis Temperature Coefficient of Resistance Span Offset Temperature Hysteresis NOTES 1) 2) 3) 4) 0 3.0 120 -40 - Min 3.4 Typ 12 Max bar k 3.8 180 40 0.3 0.15 + 3300 - 2300 + 80 0.8 Unit Notes 150 0 0.05 0.05 mV mV % FS % FS ppm/ C ppm/ C V/ C % FS 1 2 3 + 2400 - 1500 - 80 + 2800 - 1900 0.3 4 Deviation from endpoint straight line from 0 bar to 12 bar at one half full-scale pressure. Maximum difference in output at any pressure within the operating pressure range. Slope of the endpoint straight line from 25 to 60 C C. Maximum difference in offset after one thermal cycle from -40 to +125 C C. 00007812351 ECN 743 DA7812_003.doc May 05th, 2005 3/4 PICKING TOOLS The MS7812 sensors have a sensitive membrane (0.5 x 0.5 mm) the top surface of the sensor dice has an outer of diameter is: 1.62 x 1.48 mm. The pick and place tool has to be of a soft material as rubber (Hardness 78-97 Shore A). Its external size must fit the sensor and the vacuum cavity must be as large as the membrane itself. Successful test where done with some tools of SPT, see SPT drawing and references bellow). SPT references External dimension Internal dimensions RTR-A1-060x060 TL & TW: 0.06 inch /1.52 mm H: 0.035 inch / 0.89 mm ORDERING INFORMATION Product Code MS7812-A MS7812-D Product 1200 kPa Absolute Pressure Sensor 1200 kPa Differential Pressure Sensor Art.-Nr. 781225021 781225121 The MS7812 dice are supplied sawn on blue foil, mounted on plastic rings FACTORY CONTACTS Intersema Sensoric SA Ch. Chapons-des-Pres 11 CH-2022 BEVAIX SWITZERLAND Tel. 032 847 9550 Tel. Int. +41 32 847 9550 Telefax +41 32 847 9569 e-mail: http://www.intersema.ch NOTICE Intersema reserves the right to make changes to the products contained in this data sheet in order to improve the design or performance and to supply the best possible products. Intersema assumes no responsibility for the use of any circuits shown in this data sheet, conveys no license under any patent or other rights unless otherwise specified in this data sheet, and makes no claim that the circuits are free from patent infringement. Applications for any devices shown in this data sheet are for illustration only and Intersema makes no claim or warranty that such applications will be suitable for the use specified without further testing or modification. 00007812351 ECN 743 DA7812_003.doc May 05th, 2005 4/4 |
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