SS5781 Unipolar Hall Switch-Low Sensitivity Application Examples Features and Benefits – – – – – – – – – 3.5V to 24V Operation -40℃ to 150℃ Superior temperature operation CMOS technology Low current consumption Chopper-stabilized amplifier stage Open drain output Low sensitivity Small Size-SOT23 3L or SIP 3L both RoHS compliant packages – – – – – – – 3 pin SOT23 (suffix SO) Automotive, Consumer and Industrial Solid-state switch Brushless DC motor commutation Speed detection Angular position detection Proximity detection Current detector 3 pin SIP (suffix UA) Functional Block Diagram VDD Voltage Regulatr OUT Chopper Hall Plate GND SIP Package Pin 1 – V DD Pin 2 – GND Pin 3 – OUT SOT Package Pin 1 – V DD Pin 2 – OUT Pin 3 – GND 1 V2.00 May 1, 2012 SS5781 Unipolar Hall Switch-Low Sensitivity General Description The SS5781 is a unipolar Hall-effect sensor IC fabricated from CMOS technology. The device integrates a voltage regulator, Hall sensor with dynamic offset cancellation system, small signal amplifier, Schmitt trigger and an open-drain output driver. With suitable output pull up, they can be used with bipolar or CMOS logic circuits. more stable with both temperature and supply voltage changes. The unipolar switching characteristic makes these devices ideal for use with a simple bar or rod magnet. Thanks to its wide operating voltage range and extended choice of temperature range, it is quite suitable for use in automotive, industrial and consumer applications. These Hall-effect switches are monolithic integrated circuits with tighter magnetic specifications, designed to operate continuously over extended temperatures to +150℃,and are The device is delivered in a Small Outline Transistor (SOT) or in a Plastic Single In Line (SIP 3L flat). Both 3-lead packages are RoHS compliant. Glossary of Terms MilliTesla (mT), Gauss Units of magnetic flux density: 1mT = 10 Gauss RoHS Restriction of Hazardous Substances Operating Point (B OP ) Magnetic flux density applied on the branded side of the package which turns the output driver ON (V OUT = V DSon ) Release Point (B RP ) Magnetic flux density applied on the branded side of the package which turns the output driver OFF (V OUT = high) 2 V2.00 May 1, 2012 SS5781 Unipolar Hall Switch-Low Sensitivity Pins Definition and Description SOT Pin № SIP Pin № Name Type Function 1 1 VDD Supply Supply Voltage pin 2 3 OUT Output Open Drain Output pin 3 2 GND Ground Ground pin Absolute Maximum Ratings Parameter Symbol Supply Voltage VDD 28 V Supply Current IDD 50 mA Output Voltage VOUT 28 V Output Current IOUT 50 mA Storage Temperature Range TS -65 to 170 °C Symbol Value Units Temperature Suffix “E” TA -40 to 85 °C Temperature Suffix “K” TA -40 to 125 °C Temperature Suffix “L” TA -40 to 150 °C Value Units Absolute maximum ratings Operating Temperature Range Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute-maximum- rated conditions for extended periods may affect device reliability. 3 V2.00 May 1, 2012 SS5781 Unipolar Hall Switch-Low Sensitivity General Electrical Specifications DC Operating Parameters T A = 25℃, V DD = 3.5V to 24V (unless otherwise specified) Parameter Symbol Test Conditions Min Supply Voltage VDD Operating 3.5 Supply Current IDD B < B RP 1.5 Output Saturation Voltage VDSon Output Leakage Current Typ Max Units 24 V 2.5 5 mA IOUT = 20mA, B > B OP 0.4 0.5 V IOFF B < B RP VOUT = 24V 0.01 10 µA Output Rise Time tr RL = 1kΩ, CL = 20pF 0.25 µs Output Fall Time tf RL =1kΩ, CL = 20pF 0.25 µs Magnetic Specifications DC Operating Parameters VDD = 3.5V to 24V (unless otherwise specified) SS5781 Parameter Symbol Operating Point B OP Release Point B RP Hysteresis B HYS Test Conditions Ta=25℃,Vdd=12V DC Min Typ Max Units 70 110 150 G 20 60 100 G 20 50 70 G Application Information Typical Three-Wire Application Circuit 4 V2.00 May 1, 2012 SS5781 Unipolar Hall Switch-Low Sensitivity Automotive and Harsh, Noisy Environments Three-Wire Circuit Application Comments For proper operation, a 100nF bypass capacitor should be placed as close as possible to the device between the VDD and ground pin. For reverse voltage protection, it is recommended to connect a resistor or a diode in series with the VDD pin. When using a resistor, three points are important: - the resistor has to limit the reverse current to 50mA maximum (VCC / R1 50mA) - the resulting device supply voltage VDD has to be higher than VDD min (VDD = VCC – R1.IDD) - the resistor has to withstand the power dissipated in reverse voltage condition (PD = VCC2/ R1) Using a diode, a reverse current cannot flow and the voltage drop is almost constant (0.7V). Therefore, a 100 /0.25W resistor for 5V application and a diode for higher supply voltage are recommended. Both solutions provide the required reverse voltage protection. When a weak power supply is used or when the device is intended to be used in noisy environment, it is recommended that figure 13.3 from the Application Information section is used. The low-pass filter formed by R1 and C1 and the Zener diode Z1 bypass the disturbances or voltage spikes occurring on the device supply voltage VDD. The diode D1 provides additional reverse voltage protection. ESD Precautions Electronic semiconductor products are sensitive to Electro Static Discharge (ESD). Always observe Electro Static Discharge control procedures whenever handling semiconductor products. 5 V2.00 May 1, 2012 SS5781 Unipolar Hall Switch-Low Sensitivity Package Information Package UA, 3-Pin SIP: 6 V2.00 May 1, 2012 SS5781 Unipolar Hall Switch-Low Sensitivity Package SE, 3-Pin SOT-23: Ordering Information Part No. Pb-free Temperature Code Package Code Packing SS5781ESOT YES -40°C to 85°C SOT-23 7-in. reel, 3000 pieces/reel SS5781EUA YES -40°C to 85°C TO-92 Bulk, 1000 pieces/bag SS5781KSOT YES -40°C to 125°C SOT-23 7-in. reel, 3000 pieces/reel SS5781KUA YES -40°C to 125°C TO-92 Bulk, 1000 pieces/bag SS5781LSOT YES -40°C to 150°C SOT-23 7-in. reel, 3000 pieces/reel SS5781LUA YES -40°C to 150°C TO-92 Bulk, 1000 pieces/bag 7 V2.00 May 1, 2012