LF32115TMR

High Sensitivity Low Power TMR Switch Position Sensing > LF32115TMR TMR Unipolar Switch 17 Gauss 200nA Open Drain Sensor Description The LF32115TMR TMR Switch is a digital unipolar 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 open drain output and X axis sensing direction. Functional Block Diagram Vcc Power regulator with temperature compensation Osc and Duty Control Logic Vout TMR Sensor Offset cancellation 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 200nA (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 LF32115TMR 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. Driver Features GND GND TMR Switch Typical Applications Circuit • Tunneling Magnetoresistance (TMR) Technology • Low Power Consumption at 200nA • X axis sensing direction • High Frequency up to 50Hz • Operation with North or South Pole • 1.8V to 5.5V Operating Range Benefits • Low Switching Points for High Sensitivity • Excellent Thermal Stability Vcc 1K Vcc TMR Out 0.1µF 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. • High Tolerance to External Magnetic Field Interference Applications • Proximity Switches • Utility Meters including Gas, Water and Heat Meters • Speed Sensing • Ultra low power applications • Rotary and Linear Position sensing Output Behavior Versus Magnetic Pole Parameter South Pole Test Conditions Output (volts) B > BOPS Low (On) 0 < B < BRPS High (Off) Note: 1. When power is turned on under zero magnetic field, the output is “High”. 2. The power-on settling time of the device is 3ms, and the output latches to high level after this settling time. When a S-pole approaches the pin 1 side, Vout will transition to Low. The correct state will be obtained after first excursion of the magnetic field beyond BOP or BRP. 3. The device circuitry is activated for a short period of time as awake state, and deactivated the remainder of the period as sleep state. The device in sleep state will retain the output status of the last sampled state. © 2019 Littelfuse Revised: 10/09/19 Specifications are subject to change without notice. littelfuse.com High Sensitivity Low Power TMR Switch Position Sensing > LF32115TMR 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 20 mA Magnetic Flux Density 4000 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 Supply Voltage 1.8 3 5.5 V Operating Output Stress Voltage 5.5 V Ileak (average) Output leak current 1 μA Output = High,Vcc = 3V, Vout = 3V VOH Output High Voltage V Pull-up Resistance = 1Kohm Roff Output turn-off Resistance MΩ Output = High Ron Output turn-on Resistance 10 Ω Output = Low VOL Output Low Voltage 0.1 V Output = Low, Vcc = 3V, Isink = 3mA ICC Supply Current 200 nA Output Open Response Frequency 50 Hz VCC Vstress Freq Vcc -0.2 10 Magnetic Characteristics (@TA = +25°C, Vcc = 3.0V) Symbol Characteristics Min. Typ. Max. Unit BOP Operation Point 9 17 25 Gauss BRP Release Point 5 13 20 Gauss BH Hysteresis -- 4 -- Gauss © 2019 Littelfuse Revised: 10/09/19 Specifications are subject to change without notice. littelfuse.com High Sensitivity Low Power TMR Switch Position Sensing > LF32115TMR Pin Configuration and Sensing Direction of Magnetic Field VOUT VOH SOT23-3 GND 3 Part Marking Code BH DxxxY VOL 1 2 Vcc VOUT N Pole 0 BRP BOP +B S Pole Part Marking Code: Cxxxy: C = LF32115TMR; xxx = Julian manufactured date; y = manufactured year Moisture Sensitivity Level: Rating is 3 Pick and Place Nozzle: Samsung CN140 or equivalent Pin Name Pin No. SOT23-3 Pin Function VOUT 2 Output GND 3 Ground VCC 1 Supply Voltage 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 Example: LF32115TMR is an Omnipolar, PushPull, 1.5uA, X axis, 17 Gauss Note: Every combination is NOT offered. Contact Littelfuse for availability. © 2019 Littelfuse Revised: 10/09/19 Specifications are subject to change without notice. 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 littelfuse.com High Sensitivity Low Power TMR Switch Position Sensing > LF32115TMR 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: 10/09/19 Specifications are subject to change without notice. littelfuse.com High Sensitivity Low Power TMR Switch Position Sensing > LF32115TMR SOT23-3 Package Information 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: 10/09/19 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 > LF32115TMR TMR Sensor Position (SOT23-3 Elements) 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: 10/09/19 Specifications are subject to change without notice. littelfuse.com