SS1881 Hall Latch - High Sensitivity Features and Benefits – – – – – – – Wide operating voltage range from 2.5V to 24V High magnetic sensitivity – Multi-purpose CMOS technology Chopper-stabilized amplifier stage Superior temperature stability Extremely low switchpoint dr Insensitive to physical stress Low current consumption Open drain output Tiny SOT23 3L or flat SIP 3L both RoHS Compliant packages Application Examples Automotive, Consumer and Industrial Solid-state switch Brushless DC motor commutation Speed detection Linear position detection Angular position detection Proximity detection 3 pin SOT23 (suffix SO) 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 SS1881 Hall Latch - High Sensitivity General Discription The SS1881 is a bipolar Hall effect sensor IC fabricated from mixed signal CMOS technology. The device integrates a voltage regulator, Hall sensor with dynamic offset cancellation system, Schmitt trigger and an open-drain output driver, all in a single package. in 5V and 12V brushless DC motors. It incorporates advanced chopper stabilization techniques to provide accurate and stable magnetic switch points. There are many applications for this HED – Hall Electronic Device - in addition to those listed above. The design, specifications and performance have been optimized for commutation applications The device is delivered in a Small Outline Transistor (SOT) for surface mount process or in a Plastic Single In Line (SIP 3L flat) for through- hole mount. Both 3-lead packages are RoHS compliant. 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. Glossary of Terms MilliTesla (mT), Gauss Units of magnetic flux density: 1mT = 10 Gauss RoHS Restriction of Hazardous Substances SOT Small Outline Transistor (SOT package) – also referred with the package code “SO” ESD Electro-Static Discharge BLDC Brush-Less Direct-Current 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) Pin Definitions and Descriptions 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 2 V2.00 May.1, 2012 SS1881 Hall Latch - High Sensitivity Detailed General Description The SS1881 exhibits latch magnetic switching characteristics. Therefore, it requires both south and north poles to operate properly. The OUT pin of these devices switches low (turns on) when a magnetic field perpendicular to the Hall sensor exceeds the operate point threshold, B OP . After turn-on, the output voltage is V DSon . Note that the device latches, that is, a south pole of sufficient strength towards the branded surface of the device turns the device on. The device remains on if the south pole is removed (B→0). This latching property defines the device as a magnetic memory. When the magnetic field is reduced below the release point, BRP , the OUT pin turns off (goes high). The difference in the magnetic operate and release points is the hysteresis, B HYS , of the device. This built-in hysteresis prevents output oscillation near the switching point, and allows clean switching of the output even in the presence of external mechanical vibration and electrical noise. The device behaves as a latch with symmetric operating and release switching points (BOP=|BRP|). This means magnetic fields with equivalent strength and opposite direction drive the output high and low. Powering-on the device in the hysteresis region (less than B OP and higher than B RP ) allows an indeterminate output state. The correct state is attained after the fi rst excursion beyond B OP or B RP . The SOT-23 device is reversed from the UA package. The SOT-23 output transistor will be latched on in the presence of a sufficiently strong North pole magnetic field applied to the marked face. Output level Output level OUT = High OUT = High B HYS B HYS OUT = Low OUT = Low B RP -30Gs typ UA package 0mT B OP 30Gs typ Flux density - Latch characteristic SE B OP 30Gs typ B RP -30Gs typ 0mT package - Latch characteristic Flux density Unique Features Based on mixed signal CMOS technology, SS1881 is a Hall-effect device with high magnetic sensitivity. This multi-purpose latch meets most of the application requirements. The chopper-stabilized amplifier uses switched capacitor technique to suppress the offset generally observed with Hall sensors and amplifiers. The CMOS technology makes this advanced technique possible and contributes to smaller chip size and lower current consumption than bipolar technology. The small chip size is also an important factor to minimize the effect of physical stress. This combination results in more stable magnetic characteristics and enables faster and more precise design. The wide operating voltage from 2.5V to 24V, low current consumption and large choice of operating temperature range according to “L”, “K”and “E” specification make this device suitable for automotive, industrial and consumer applications. 3 V2.00 May.1, 2012 SS1881 Hall Latch - High Sensitivity Absolute Maximum Ratings Parameter Symbol Supply Voltage Value Units VDD 28 V Supply Current IDD 50 mA Output Voltage VOUT 28 V Output Current IOUT 50 mA Storage Temperature Range TS -50 to 150 °C Maximum Junction Temperature TJ 165 °C Value Units Absolute maximum ratings Symbol Operating Temperature Range Temperature Suffix “E” TA -40 to 85 °C Temperature Suffix “K” TA -40 to125 °C Temperature Suffix “L” TA -40 to 150 °C Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute-maximum- rated conditions for extended periods may affect device reliability. General Electrical Specifications DC Operating Parameters T A = 25℃, V DD = 2.5V to 24V (unless otherwise specified) Parameter Symbol Test Conditions Supply Voltage VDD Operating Supply Current IDD Min Typ Units 24 V B < B RP 5 mA VDSon IOUT = 20mA, B > B OP 0.5 V IOFF B < B RP VOUT = 24V 1 10 µA Output Rise Time tr RL = 1kΩ, CL = 20pF 0.25 µs Output Fall Time tf RL = 1kΩ, CL = 20pF 0.25 µs Output Saturation Voltage Output Leakage Current 2.2 Max Maximum Switching Frequency FSW --- 10 KHz Package Thermal Resistance RTH Single layer (1S) Jedec board 301 °C/W Electrical specifications Note: The output of SS1881 will be switched after the supply voltage is over 2.2V, but the magnetic characteristics won't be normal until the supply is over 2.5V. 4 V2.00 May.1, 2012 SS1881 Hall Latch - High Sensitivity Magnetic Specifications DC Operating Parameters VDD = 2.5V to 24V (unless otherwise specified) Typ Max Units 15 30 45 G -45 -30 -15 G B HYS 45 60 75 G Operating Point B OP 15 30 50 G Release Point B RP -50 -30 -15 G Hysteresis B HYS 45 60 75 G Operating Point B OP 10 30 55 G Release Point B RP -55 -30 -10 G Hysteresis B HYS 40 60 80 G Parameter Symbol Operating Point B OP Release Point B RP Hysteresis Test Conditions E spec., TA = 85°C K spec., TA = 125°C L spec., TA = 150°C Min Magnetic specifications Output Behaviour versus Magnetic Pole DC Operating Parameters TA = -40 C to 150 C, VDD = 2.5V to 24V (unless otherwise specified) Parameter Test Conditions (SE) OUT (SE) Test Conditions (UA) OUT (UA) South pole B < B RP High B > B OP Low North pole B > B OP Low B < B RP High Output behaviour versus magnetic pole 5 V2.00 May.1, 2012 SS1881 Hall Latch - High Sensitivity Application Information It is strongly recommended that an external bypass capacitor be connected (in close proximity to the Hall sensor) between the supply(VDD Pin) and ground(GND Pin) of the device to reduce both external noise and noise generated by the chopper stabilization technique. As is shown in the two figures in next page, a 0.1μF capacitor is typical. 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 = V CC 2/R1) When using a diode, a reverse current cannot flow and the voltage drop is almost constant (≈0.7V). Therefore, a 100Ω/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. Automotive and Severe Environment Protection Circuit Typical Three-Wire Application Circuit R1:100 C1 VDD S1881 C1 R2 VDD D1 OUT Z1 S1881 R2 OUT C2 C2 GND GND The SS1881 have been optimized for commutation applications in 5V and 12V brushless DC motors. The follow figure is the typical application circuit for 3 phase brushless DC motors. 6 V2.00 May.1, 2012 SS1881 Hall Latch - High Sensitivity Standard information regarding manufacturability of Hall IC with different soldering processes Our products are classified and qualified regarding soldering technology, solderability and moisture sensitivity level according to following test methods: Reflow Soldering SMD’s (Surface Mount Devices) • IPC/JEDEC J-STD-020 Moisture/Reflow Sensitivity Classification for Nonhermetic Solid State Surface Mount Devices (classification reflow profiles according to table 5-2) • EIA/JEDEC JESD22-A113 Preconditioning of Nonhermetic Surface Mount Devices Prior to Reliability Testing (reflow profiles according to table 2) Wave Soldering SMD’s (Surface Mount Devices) and THD’s (Through Hole Devices) • EN60749-20 Resistance of plastic- encapsulated SMD’s to combined effect of moisture and soldering heat • EIA/JEDEC JESD22-B106 and EN60749-15 Resistance to soldering temperature for through-hole mounted devices Iron Soldering THD’s (Through Hole Devices) • EN60749-15 Resistance to soldering temperature for through-hole mounted devices Solderability SMD’s (Surface Mount Devices) and THD’s (Through Hole Devices) • EIA/JEDEC JESD22-B102 and EN60749-21 solderability ESD Precautions Electronic semiconductor products are sensitive to Electro Static Discharge (ESD). Always observe Electro Static Discharge control procedures whenever handling semiconductor products. 7 V2.00 May.1, 2012 SS1881 Hall Latch - High Sensitivity Package Information Package UA, 3-Pin SIP: 8 V2.00 May.1, 2012 SS1881 Hall Latch - High Sensitivity Package SE, 3-Pin SOT-23： Bottom View of SOT-23 Package 3 Chip 0.56 0.66 0.95 0.80 2 1 1.50 1.40 Ordering Information Part No. Pb-free Temperature Code Package Code Packing SS1881ESOT YES -40°C to 85°C SOT-23 7-in. reel, 3000 pieces/reel SS1881EUA YES -40°C to 85°C TO-92 Bulk, 1000 pieces/bag SS1881KSOT YES -40°C to 125°C SOT-23 7-in. reel, 3000 pieces/reel SS1881KUA YES -40°C to 125°C TO-92 Bulk, 1000 pieces/bag SS1881LSOT YES -40°C to 150°C SOT-23 7-in. reel, 3000 pieces/reel SS1881LUA YES -40°C to 150°C TO-92 Bulk, 1000 pieces/bag 9 V2.00 May.1, 2012