全极性霍尔元件YS248参数.pdf
YS248 CMOS Omnipolar High Sensitivity Micropower Hall Switch 1Features 1 f?Micropower consumption for battery powered applications?Omnipolar,output switches with absolute value o North or South pole from magnet?Operation down to 2.5V?High sensitivity for direct reed switch replacement applications Chopper stabilized amplifier stage2Description IC is fabricated from mixed signal CMOS technology.It incorporates advanced chopper-stabilization techniques to provide accurate and stable magnetic switch points.The circuit design provides an internally controlled clocking mechanism to cycle power to the Hall element and analog signal processing circuits.This serves to place the high current-consuming portions of the circuit into a“Sleep”mode.Periodically the device is“Awakened”by this internal logic and the magnetic flux from the Hall element is evaluated against the predefined thresholds.If the flux density is above or below the Bop/Brp thresholds then the output transistor is driven to change states accordingly.While in the“Sleep”cycle the output transistor is latched in its previous state.The design has been optimized for service in applications requiring extended operating ill be latched on(Bop)in the presence of a sufficiently strong South or North magnetic field facing the marked side of the package.The output will be latched off(Brp)in the absence of a magnetic field.The 248 Omnipolar Hall effect sensorThe output transistor of the 248 w 3Applications?Solid state switch?Handheld Wireless Handset Awake Switch?Lid close sensor for battery powered devices?Magnet proximity sensor for reed switch replacement in low duty cycle applications 4Typical Application Circuit 2Easteras pole-independent sensing technique allows for operation with either a north pole or south pole magnet orientation,enhancing the manufacturability of the device.The state-of-the-art technology provides the same output polarity for either pole face.It is strongly recommended that an external bypass capacitor be connected(in close proximity to the Hall sensor)between the supply and ground of the device to reduce both external noise and noise generated by the chopper-stabilization technique.This is especially true due to the relatively high impedance of battery supplies.EST2485Functional Block Diagram YS248 6Pinning Mark View Pin Description 37Internal Timing Circuit 8Absolute Maximum Ratings Parameter Symbol Value Units Supply Voltage(operating)VDD6 V Supply Current IDD5 mA Output Voltage VOUT6 V Output Curent IOUT5 mA Operating Temperature Range to 85 TA-40C Storage Temperature Rang to 150 TS-50C ESD Sensitivity-4000 V Exceeding the absolute maximum ratings maause permge.Exposure to m rated conditions for extend periodsffect device reliability.y canent damaabsolute-maximude may a NAMENO STATUSDESCRIPTIONVdd 1 P Power Supply Out 2 O output Gnd 3 P IC Ground Awake Taw:120s PeriodSleep Tsl:70ms Time Current 0 Isp Iaw IavSample&Output Latched 1 3 2 YS248 4DC Electrical Characteristics DC Operating Parameters:TA=25,VDD=2.75V.9Parameter Symbol Test Conditions MinTyp Max Units Operating voltage VDDOperating 2.5 3 5.5 V Supply current IDDAverage 5 A Output Current IOUT 1.0 mA S IOUT=1mA aturation VoltageVSAT 0.4 V Awake mode time TAWOperating 175 S Sleep mode time TSLOperating 70 mS 0Magnetic Characteristics Operating Parameters:TA=25,VDD=2.75VDC.1 PARAMETER Symbol Min Type Max Units Operating Point Bop+/-35+/-60 Gs Release Point Brp+/-5+/-21 Gs Hysteresis Bhys-14 Gs 11ESD Protection)tests according to:Mil.Std.883F method 3015.7 Human Body Model(HBMLimit Values Parameter Symbol Min Max Unit Notes ESD Voltage VESD kV 4Output Voltage(V)3.0OFF2.52.0BOPNBRPSBOPS1.5BRPN1.00.5 ON0-80-60-40-20020406080 Magnetic Flux(Gauss)4 521 6+/-2 0 512Performance Characteristics 13Unique Features CMOS Hall IC Technology The chopper stabilized amplifier uses switched capacitor techniques to eliminate the amplifier offset voltage,which,in bipolar devices,is a major source of temperature sensitive drift.CMOS makes this advanced technique possible.The CMOS chip is also much smaller than a bipolar chip,allowing very sophisticated circuitry to be placed in less space.The small chip size also contributes to lower physical stress and less power consumption.Installation Comments Consider temperature coefficients of Hall IC and magnetics,as well as air gap and life time variations.Observe temperature limits during wave soldering.Typical IR solder-reflow profile:?No Rapid Heating and Cooling.?Recommended Preheating for max.2minutes at 150C?Recommended Reflowing for max.5seconds at 240C 14ESD Precautions Electronic semiconductor products are sensitive to Electro Static Discharge(ESD).Always observe Electro Static Discharge control procedures whenever handling semiconductor products.6 15Package Information 15.1 SOT-23 Package Physical Characteristics 2.70 3.10 1.001.300.70 0.90 0.000.100.35 0.50 0.100.250.20MIN2.603.001.501.801.70 2.10 321 Top View Side View End ViewNotes:1).PINOUT:Pin 1 VDD Pin 2 Output Pin 3 GND 2).All dimensions are in millimeters;Marking:;yy-last 2 digit of year;m-“A”-“Z”,Production Lot;SOT-23 Package Hall Location 7 0.560.660.950.801.50 1.40 Chip 3 Bottom View of SOT-23 Package 21 48-Code of Device(YS248)YS248 15.3 TO-92 Package Physical Characteristics 4.1 0.1 1231.27 2.13 1.87 1.001.2045 11.58 0.1 3 10.76 0.05 3.18 0.1 3-0.44 3-0.44 0.05 0.05 2.3.0.1 0.84(Nom)3 16 16 13 114 0.5 Notes:1).Controlling dimension:mm;2).Lesds must be free of flash and plating voids;3).Do not bend leads within 1 mm of lead to packageinterface;4).PINOUT:Pin 1 VDD Pin 2 GND Pin 3 Output Active Area Depth:Sensor Location123 16.Ordering Information Part No.Temperature Suffix Package Code 0 to 85)UA(TO-92S)SO(SOT-23)ST(TSOT-23)9 (4YS248YS248
