A3245 ALLEGRO [Allegro MicroSystems], A3245 Datasheet
A3245
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A3245 Summary of contents
Page 1
... The omnipolar operation of the A3245 allows activation with either a north or a south polarity fi eld of suffi cient strength. In the absence of a magnetic fi eld, the output is off. This patented magnetic-polarity-independence feature makes ...
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... VCC Terminal List Name VCC Connects power supply to chip VOUT Output from circuit GND Ground A3245-DS, Rev. 1 A3245 Product Selection Guide Packing* 7-in. reel, 3000 pieces/reel 3-pin SOT23W surface mount Bulk, 500 pieces/bag 3-pin SIP through hole 7-in. reel, 3000 pieces/reel 3-pin SOT23W surface mount ...
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... This so-called algebraic convention supports arithmetic comparison of north and south polarity values, where the relative strength of the fi eld is indicated by the absolute value of B, and the sign indicates the polarity of the fi eld (for example, a –100 G fi eld and a 100 G fi eld have equivalent strength, but opposite polarity). EMC (Electromagnetic Compatibility) REQUIREMENTS A3245-DS, Rev. 1 A3245 Test Conditions V Operating, T < ...
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... Supply Current (Off) versus Ambient Temperature 5.0 4.0 3.0 2.0 1.0 0 – (°C) A Output Voltage (On) versus Ambient Temperature 500 450 400 350 300 250 200 150 100 50 0 – (°C) A A3245-DS, Rev. 1 A3245 Electrical Characteristic Data 5.0 4.0 V (V) CC 3.0 24 3.6 2.0 1.0 0 100 150 0 5.0 4.0 V (V) CC 3.0 24 3.6 2.0 1.0 0 100 150 0 ...
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... Release Point (South) versus Ambient Temperature – (°C) (° Continued on the next page... A3245-DS, Rev. 1 A3245 Magnetic Characteristic Data Operate Point (North) versus Ambient Temperature -15 -20 -25 -30 V (V) CC -35 24 3.6 -40 -45 -50 -55 100 150 –50 ...
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... V (V) CC Release Point (South) versus Supply Voltage (V) CC A3245-DS, Rev. 1 A3245 -15 -20 -25 T (°C) -30 A –40 -35 25 -40 150 -45 -50 - -10 -15 -20 T (°C) A -25 –40 -30 25 150 ...
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... Chopper-Stabilized Omnipolar Hall Effect Switches THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information Characteristic Package Thermal Resistance A3245-DS, Rev. 1 A3245 Symbol Test Conditions Package LH-3, 1-layer PCB with copper limited to solder pads Package LH-3, 2-layer PCB with 0.926 in R θJA side, connected by thermal vias ...
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... Figure 1: Switching Behavior of Omnipolar Switches. In Panel A, on the horizontal axis, the B+ direction indicates increasing south polarity magnetic fi eld strength, and the B– direction indicates decreasing south polarity fi eld strength (including the case of increasing north polarity). This behavior can be exhibited when using a circuit such as that shown in panel B. A3245-DS, Rev. 1 A3245 Functional Description supply and ground of the device to reduce both external noise and noise generated by the chopper stabilization technique ...
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... This confi guration is illustrated in fi gure 2. Hall Element Figure 2. Chopper Stabilization Circuit (Dynamic Quadrature Offset Cancellation) A3245-DS, Rev. 1 A3245 The chopper stabilization technique uses a 200 kHz high-fre- quency clock. For demodulation process, a sample and hold technique is used, where the sampling is performed at twice the chopper frequency (400 kHz) ...
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... D(max) able power level ( without exceeding T CC(max) CC(max selected R and T . θJA A A3245-DS, Rev. 1 A3245 Example: Reliability for V low-K PCB. Observe the worst-case ratings for the device, specifi cally: R θJA I CC(max) Calculate the maximum allowable power level, P invert equation fi ...
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... Chopper-Stabilized Omnipolar Hall Effect Switches A3245-DS, Rev. 1 A3245 Package LH, 3-Pin (SOT-23W) Package UA, 3-Pin 11 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com ...
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... Chopper-Stabilized Omnipolar Hall Effect Switches A3245-DS, Rev. 1 A3245 The products described herein are manufactured under one or more of the following U.S. patents: 5,045,920; 5,264,783; 5,442,283; 5,389,889; 5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719; 5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patents pending. Allegro MicroSystems, Inc. reserves the right to make, from time to time, such de par tures from the detail spec i fi ...