SS542 Hall Latch - High Sensitivity Features and Benefits Application Examples – – – – – – – – – – CMOS Hall IC Technology Bipolar Output CMOS Multi-purpose latch Solid-State Reliability much better than reed switch Operation down to 2.5V Supply current down to 45μA, very low power consumption CMOS inverter output (no pull-up resistance) High sensitivity for direct reed switch replacement application Solid state switch Magneto-electric conversion switch Magnet proximity sensor for reed switch replacement in low duty cycle applications 3 pin TSOT23 (suffix ST) 3 pin SIP (suffix UA) Functional Block Diagram 1 V3.10 Nov 1, 2013 SS542 Hall Latch - High Sensitivity General Description The SS542 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 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 lifetime in battery powered systems. The output transistor of the SS542 switches low (turns on) when a magnetic field perpendicular to the Hall sensor exceeds the operate point threshold (BOP). After turn-on, the output voltage is VDS. The device remains on if the south pole is removed (B→0). Thi s latching property defines the device as a magnetic memory. When the magnetic field is reduced below the release point, BRP, the Output transistor turns off (goes high). The difference in the magnetic operate and release points is the hysteresis (BHYS) 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 TSOT-23 device is reversed from the UA package. The TSOT-23 output transistor will be latched on in the presence of a sufficiently strong North pole magnetic field applied to the marked face. Glossary of Terms Output level Output level OUT = High OUT = High BHYS BHYS OUT = Low OUT = Low BRP -30Gs typ 0mT BOP 30Gs typ BRP -30Gs typ Flux density STT UA package - Latch characteristic package 0mT BOP 30Gs typ Flux density - Latch characteristic Internal Timing Circuit Current Period Iaw Sample & Output Iav Isp Awake Taw:20μs Sleep Tsl:600μs 0 Time 2 V3.10 Nov 1, 2013 SS542 Hall Latch - High Sensitivity Absolute Maximum Ratings Parameter Symbol VDD Supply Voltage Value 28 Units V Supply Current IDD 50 mA Output Voltage VOUT 28 V Output Current IOUT 50 mA Operating Temperature Range TA -40 to 85 °C Storage Temperature Rang TS -50 to 150 °C - 4000 V ESD Sensitivity Operating Temperature Range 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 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 TA = 25°C, VDD= 2.5V to 5.5V (unless otherwise specified) Parameter Symbol Test Conditions Operating voltage VDD Operating Supply current IDD Average Output Current IOUT Saturation Voltage VSAT IOUT=1mA Awake mode time TAW Operating Sleep mode time TSL Operating Min Typ Max Units 2.5 3 5.5 V 45 μA 1.0 mA 0.4 V μS 20 μS 600 Magnetic Specifications DC Operating Parameters VDD = 2.5 to 5.5V (unless otherwise specified) Package Parameter Symbol Operating Point BOP Test Conditions Min Typ Max Units 5 25 40 G -40 -25 -5 G Ta=25°C UA Release Point BRP Hysteresis BHYST Operating Point BOP Vdd=2.75V DC 40 G -40 -25 -5 G 5 25 40 G Ta=25°C SO Release Point Hysteresis BRP Vdd=2.75V DC BHYST 40 3 G V3.10 Nov 1, 2013 SS542 Hall Latch - High Sensitivity Output Behavior versus Magnetic Pole DC Operating Parameters TA = -40°C to 150°C, VDD = 2.5 to 5.5V (unless otherwise specified) Test Conditions (UA) Test Conditions (SO) OUT B < BRP B > BRP High B > BOP B < BOP Low The SOT-23 device is reversed from the UA package. The SOT-23 output transistor will be turned on(drops low) in the presence of a sufficiently strong North pole magnetic field applied to the marked face and turned off(hoists high) in the presence of a sufficiently strong South pole magnetic field. 4 V3.10 Nov 1, 2013 SS542 Hall Latch - High Sensitivity Package Information 2.13 0.76 ± 0.05 1.58 ± 0.1 Package UA, 3-Pin SIP: 3° ± 1° 1.00 45° ± 1° 4.1 ± 0.1 1 2 3 3.18 ± 0.1 Sensor Location Active Area Depth: 0.84(Nom) 3° ± 1° 6° ± 1° 3° ± 1° 6° ± 1° 1 2 0.05 ± 0.05 3 2.3.± 0.1 3 - 0.44 14 ± 0.5 3 - 0.39 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 package interface ; 4). PINOUT: Pin 1 VDD Pin 2 GND Pin 3 Output 1.27 5 V3.10 Nov 1, 2013 SS542 Hall Latch - High Sensitivity Package STT, 3-Pin TSOT-23: Notes: 1). PINOUT: Top View Pin 1 VDD Pin 2 Output Pin 3 GND 2). All dimensions are in millimeters ; 3 1.60 2.65 1 2 1.70 Side View End View 2.82 0.08 0.70 0.70 0.20 0.00 0.35 Hall Plate Location Bottom View of TSOT-23 Package 3 Chip 0.36 0.46 0.95 2 1 1.50 Ordering Information Part No. SS542ESTT SS542EAU SS542KSTT SS542KAU SS542LSTT SS542LAU Pb-free YES YES YES YES YES YES Temperature Code -40°C to 85°C -40°C to 85°C -40°C to 125°C -40°C to 125°C -40°C to 150°C -40°C to 150°C Package Code TSOT-23 TO-92 TSOT-23 TO-92 TSOT-23 TO-92 6 Packing 7-in. reel, 3000 pieces/ reel Bulk, 1000 pieces/ bag 7-in. reel, 3000 pieces/ reel Bulk, 1000 pieces/ bag 7-in. reel, 3000 pieces/ reel Bulk, 1000 pieces/ bag V3.10 Nov 1, 2013