SS239 CMOS Omnipolar High Sensitivity Micropower Hall Switch Packages Features and Benefits – – Operation down to 2.5V Micropower consumption for battery powered applications High sensitivity for direct reed switch replacement applications Omnipolar, output switches with absolute value of North or South pole from magnet – – 3 pin SOT23 (suffix SO) 3 pin SIP (suffix UA) Functional Block Diagram Application Examples – – – – 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 Chopper stabilized amplifier stage2．Description The SS239 Omnipolar Hall effect sensor 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 B OP /B RP 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 lifetime in battery powered systems. The output transistor of the SS239 will be latched on (B OP ) 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 (B RP ) in the absence of a magnetic field. 1 V2.10 May 1, 2012 SS239 CMOS Omnipolar High Sensitivity Micropower Hall Switch Typical Application Circuit SEC's 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 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. Internal Timing Circuit Current Period Iaw Sample & Output Latched Iavg Isp Awake Taw: 175μs Sleep Tsl: 70ms 0 Time 2 V2.10 May 1, 2012 SS239 CMOS Omnipolar High Sensitivity Micropower Hall Switch Pin Definitions and Descriptions SOT Pin № SIP Pin № Name Type Function 1 2 3 VDD OUT GND Supply Output Ground Supply Voltage pin Open Drain Output pin Ground pin 1 3 2 Table 1: Pin definitions and descriptions Absolute Maximum Ratings Parameter Symbol Supply Voltage (operating) V DD Supply Current I DD Output Voltage V OUT Output Current I OUT Operating Temperature Range T A Storage Temperature Range TS ESD Sensitivity Table 2: Absolute maximum ratings Value Units 6 5 6 5 -40 to 85 -50 to 150 4000 V mA V mA °C °C V Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. DC Electrical Characteristics DC Operating Parameters: T A = 25℃, V DD = 2.75V. Parameter Symbol Supply Voltage V DD Supply Current I DD Output Current I OUT Saturation Voltage V SAT Awake mode time T AW Sleep mode time T SL Table 3: DC Electrical Characteristics Test Conditions Min Typ Max Units Operating Average 2.5 3 5 5.5 V µA mA V µs ms I OUT = 1mA Operating Operating 3 1.0 0.4 175 70 V2.10 May 1, 2012 SS239 CMOS Omnipolar High Sensitivity Micropower Hall Switch Magnetic Characteristics Output Voltage (V) 3.0 OFF 2.5 2.0 B OPN 1.5 B RPS B OPS B RPN 1.0 0.5 ON 0 -80 -60 -40 -20 0 20 40 60 80 Magnetic Flux (Gauss) Operating Parameters: T A = 25°C, V DD = 2.75V DC SS239 Parameter Symbol Min Type Max Units Operating Point Release Point Hysteresis B OP B RP B HYST +/-5 - +/-35 +/-21 14 +/-60 - Gs Gs Gs Table 4: Magnetic Specifications ESD Protection Human Body Model (HBM) tests according to: Mil. Std. 883F method 3015.7 Limit Values Parameter Symbol Unit Min Max ESD Voltage V ESD 4 kV Notes 4 V2.10 May 1, 2012 SS239 CMOS Omnipolar High Sensitivity Micropower Hall Switch Performance Characteristics 5 V2.10 May 1, 2012 SS239 CMOS Omnipolar High Sensitivity Micropower Hall Switch Unique 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 magnetic, 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 150°C – Recommended Reflowing for max. 5seconds at 240°C ESD Precautions Electronic semiconductor products are sensitive to Electro Static Discharge (ESD). Always observe Electro Static Discharge control procedures whenever handling semiconductor products. 6 V2.10 May 1, 2012 SS239 CMOS Omnipolar High Sensitivity Micropower Hall Switch Package UA, 3-Pin SIP: 7 V2.10 May 1, 2012 SS239 CMOS Omnipolar High Sensitivity Micropower Hall Switch Package SOT, 3-Pin SOT-23: SOT-23 Package Hall Location: Ordering Information Part No. Pb-free Temperature Code Package Code Packing SS239ESOT YES -40°C to 85°C SOT-23 7-in. reel, 3000 pieces/reel SS239EUA YES -40°C to 85°C TO-92 Bulk, 1000 pieces/bag SS239KSOT YES -40°C to 125°C SOT-23 7-in. reel, 3000 pieces/reel SS239KUA YES -40°C to 125°C TO-92 Bulk, 1000 pieces/bag SS239LSOT YES -40°C to 150°C SOT-23 7-in. reel, 3000 pieces/reel SS239LUA YES -40°C to 150°C TO-92 Bulk, 1000 pieces/bag 8 V2.10 May 1, 2012