LF21215TMR

High Sensitivity Low Power TMR Switch Position Sensing > LF21215TMR TMR Omni-polar Switch 17 Gauss 1.5uA PushPull Sensor Description The LF21215TMR TMR Switch is a digital omni-polar magnetic switch that integrates TMR and CMOS technology in order to provide a magnetically triggered digital switch with high sensitivity, high speed, and low power consumption. It contains a TMR magnetic sensor and CMOS signal processing circuitry within the same package, including an on-chip TMR voltage generator for precise magnetic sensing, a TMR voltage amplifier and comparator plus a Schmitt trigger to provide switching hysteresis for noise rejection, CMOS push-pull output and X axis sensing direction. An internal band gap regulator is used to provide a temperature compensated supply voltage for internal circuits, permitting a wide range of supply voltages. It draws only 1.5μA (see Features below) resulting in low power operation, additionally it has fast response, accurate switching points, excellent thermal stability, and immunity to stray field interference. It is available in the SOT23-3 package. The output of the LF21215TMR switches low (turns on) when the magnetic field parallel to the sensing axis exceeds the operate point threshold, BOP. When the magnetic field is reduced below the release point BRP device output switches high (turns off). The difference between the BOP and the BRP is the hysteresis BH of the device. Functional Block Diagram Vcc Power regulator with temperature compensation TMR Sensor Offset cancellation Vout Latch Features GND TMR Switch Typical Applications Circuit • Tunneling Magnetoresistance (TMR) Technology • Low Power Consumption at 1.5μA • X axis sensing direction • High Frequency up to 1kHz • Operation with North or South Pole • 1.8V to 5.5V Operating Range Benefits • Low Switching Points for High Sensitivity • Excellent Thermal Stability Vcc Vcc TMR 0.1µF Out • High Tolerance to External Magnetic Field Interference Out GND GND Note: It is strongly recommended that an external bypass capacitor be connected in-closeproximity to the device between the supply and ground pins to reduce noise. The recommended value for the external bypass capacitor is 0.1μF. Applications • Proximity Switches • Utility Meters including Gas, Water and Heat Meters • Speed Sensing • Low power applications • Rotary and Linear Position sensing Output Behavior Versus Magnetic Pole Parameter South Pole North Pole Test Conditions Output (volts) B > BOPS Low (On) 0 < B < BRPS High (Off) B < BOPN Low (On) 0 > B > BRPN High (Off) Note: When power is turned on under Zero magnetic field, the output is “High”. © 2019 Littelfuse Revised: 09/26/19 Specifications are subject to change without notice. littelfuse.com High Sensitivity Low Power TMR Switch Position Sensing > LF21215TMR Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified) Symbol Characteristics Values Unit VCC Supply Voltage 7.0 V VRCC Reverse Supply Voltage 0.3 V Output Current 9.0 mA Magnetic Flux Density 2800 Gauss ESD level(HBM) 2 kV TA Operating Temperature -40 ~ 125 °C Tstg Storage Temperature -50 ~ 150 °C IOUTSINK B VESD Note: Stresses greater than the ‘Absolute Maximum Ratings’ specified above may cause permanent damage to the device. These are stress ratings only; functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may be affected by exposure to absolute maximum rating conditions for extended periods of time. Electrical Characteristics (@TA = +25°C, Vcc = 3.0V) Symbol Characteristics Min. Typ. Max. Unit Conditions VCC Supply Voltage 1.8 3.0 5.5 V Operating VOH Output High Voltage Vcc -0.3 Vcc V VOL Output Low Voltage 0 0.2 V Icc Supply Current 1.5 μA Response Frequency 1.0 kHz Freq Output Open Magnetic Characteristics (@TA = +25°C, Vcc = 3.0V) Symbol BOPS BOPN BRPS BRPN BH Characteristics Operation Point Release Point Hysteresis © 2019 Littelfuse Revised: 09/26/19 Specifications are subject to change without notice. Min. Typ. Max. Unit 10 17 30 Gauss -30 -17 -10 Gauss 5 10 20 Gauss -20 -10 -5 Gauss -- 7 -- Gauss littelfuse.com High Sensitivity Low Power TMR Switch Position Sensing > LF21215TMR Pin Configuration and Sensing Direction of Magnetic Field SOT23-3 Part Marking Code Output Off 5V Max AXXXY 1 2 Vcc VOUT BOPS B OPN Output Voltage GND 3 Output On Part Marking Code: Axxxy: A = LF21215TMR; xxx = Julian manufactured date; y = manufactured year 0 -B BRPN BRPS 0 Output On +B Magnetic Flux Pin Name Pin No. SOT23-3 Pin Function Vout 2 Output GND 3 Ground Vcc 1 Supply Voltage Moisture Sensitivity Level: Rating is 3 Pick and Place Nozzle: Samsung CN140 or equivalent Part Numbering System LF - X - X - X - X - X TMR Littelfuse Brand Switch Type Type 1 = Bipolar 2 = Omnipolar 3 = Unipolar Output 1 = PushPull 2 = Open Drain Quiescent Current 1 = 200nA 2 = 1.5uA 3 = 0.6mA Tunneling Magnetoresistance Technology Switch Sensitivity Gauss 1 = 5 Gauss 2 = 7 Gauss 3 = 10 Gauss 4 = 14 Gauss 5 = 17 Gauss Sensing Axis 1 = X axis 2 = Y axis 3 = Z axis Example: LF21215TMR is an Omnipolar, PushPull, 1.5uA, X axis, 17 Gauss Note: Every combination is NOT offered. Contact Littelfuse for availability. © 2019 Littelfuse Revised: 09/26/19 Specifications are subject to change without notice. littelfuse.com High Sensitivity Low Power TMR Switch Position Sensing > LF21215TMR Soldering Profile for Lead-free packages Tape and Reel ØA 178±2 ØN ØB C W1 W2 W3 54±2 13.2±0.3 2.2±0.3 8.4±1.5/0.0 12 MAX 1.4±0.4 © 2019 Littelfuse Revised: 09/26/19 Specifications are subject to change without notice. littelfuse.com High Sensitivity Low Power TMR Switch Position Sensing > LF21215TMR Package Information (SOT23-3 package drawing) Symbol Dimensions in Millimeters Min Dimensions in Inches Nom Max Min Nom Max - - 1.45 - - 0.057 A1 0.00 - 0.15 0.000 - 0.006 A2 0.90 1.10 1.30 0.035 0.043 0.051 A3 0.60 b 0.39 0.65 0.70 0.024 0.026 0.028 - 0.49 0.015 - 0.019 c 0.12 - 0.19 0.005 - 0.007 D 2.85 2.95 3.05 0.112 0.116 0.120 E 2.60 2.80 3.00 0.102 0.110 0.118 E1 1.55 1.65 1.75 0.061 0.065 0.069 e 0.85 0.95 1.05 0.033 0.037 0.041 e1 1.80 1.90 2.00 0.071 0.075 0.079 L 0.35 0.45 0.60 0.014 0.018 0.024 A L1 0.59REF L2 0.25BSC Ø 0 0 © 2019 Littelfuse Revised: 09/26/19 Specifications are subject to change without notice. - 0.023REF 0.01BSC 8 0 0 0 - 80 littelfuse.com High Sensitivity Low Power TMR Switch Position Sensing > LF21215TMR TMR Sensor Position (SOT23-3 Elements Position) Important Notice - Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. Disclaimer Notice - Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own applications. Littelfuse products are not designed for, and may not be used in, all applications. Read complete Disclaimer Notice at: www.littelfuse.com/disclaimer-electronics. © 2019 Littelfuse Revised: 09/26/19 Specifications are subject to change without notice. littelfuse.com