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| Hall ICs AN48810B Low current consumption, high sensitivity CMOS Hall IC One-way magnetic field operation 0.225 0.22+0.10 -0.05 5 4 Unit: mm 0.13 M I Overview The AN48810B is a Hall IC (a magnetic sensor) which has 2 times or more sensitivity and a low current consumption of about one three-hundredth compared with our conventional one. In this Hall IC, a Hall element, a offset cancel circuit, an amplifier circuit, a sample and hold circuit, a Schmidt circuit, and output stage FET are integrated on a single chip housed in a small package by IC technique. 2.100.10 1.650.10 0.225 1 2 3 0.800.10 0.320.10 0 to 0.10 0.10 1 2 3 Seating plane I Features * High sensitivity (6 mT max.) due to offset cancel circuit and a new sample and hold circuit * Small current by using intermittent action * Small package (SMD) * CMOS inverter output 5 4 SMINI-5DA (Lead-free package) I Applications * Flip type cellular phone, digital video camera I Block Diagram VCC 5 CLK N.C. 3 On/Off control N.C. 4 Hall element Switch Amplifier Sample and hold 1 Out GND 2 Note) The magnetism detection time should be longer than one intermittent action cycle (On = 200 s and Off = 51 ms). I Pin Descriptions Pin No. 1 2 3 Symbol Out GND N.C. Output Ground Description Pin No. 4 5 Symbol N.C. VCC Power supply Description 26 0.11+0.10 -0.05 0.65 0.65 1.300.10 2.000.10 Hall IC I Absolute Maximum Ratings Parameter Supply voltage Symbol VCC VOUT Output current Power dissipation Operating ambient temperature Storage temperature IO PD Topr Tstg Rating 5 5 15 60 -20 to +75 -55 to +125 AN48810B Unit V V mA mW C C Note) 1. Except for the operating ambient temperature and storage temperature, all ratings are for Ta = 25C. 2. The reverse insertion of this IC will cause its breakdown. 3. It will operate normally in several tens of ms after power on. 4. This IC is not suitable for car electrical equipment. I Recommended Operating Range Parameter Supply voltage Symbol VCC Range 2.5 to 3.5 Unit V I Electrical Characteristics at Ta = 25C Parameter Operating magnetic flux density 1 Operating magnetic flux density 2 Hysteresis width Output voltage 1 Output voltage 2 Supply current 1 Supply current 2 Supply current 3 Symbol BH-L BL-H BW VOL VOH ICCON ICCOFF ICCAVE VCC = 3 V VCC = 3 V VCC = 3 V VCC = 3 V, IO = 2 mA, B = 6 mT VCC = 3 V, IO = -2 mA, B = 0.5 mT VCC = 3 V, B = 0.5 mT VCC = 3 V, B = 0.5 mT VCC = 3 V, B = 0.5 mT Conditions Min 0.5 2.7 Typ 1.2 0.1 2.9 2 3 10 Max 6 0.3 15 Unit mT mT mT V V mA A A Note) 1. Symbol BH-L stands for the operating magnetic flux density where its output level varies from high to low. 2. Symbol BL-H stands for the operating magnetic flux density where its output level varies from low to high. 3. ICCON is a consumption current when the magnetism detection system is on, and ICCOFF is that when the magnetism detection system is off. One magnetism detection cycle is On = 200 s and Off = 51 ms. ICCAVE is an average consumption current. I Technical Data * Position of a Hall element (unit in mm) Distance from a package surface to sensor part: 0.31 mm (reference value) A Hall element is placed on the shaded part in the figure. 1.0 0.31 1.0 27 AN48810B I Technical Data (continued) * Magneto-electro conversion characteristics S Output voltage Hall IC BL-H BW BH-L N Applied magnetic flux density B Direction of applied magnetic field Operating magnetic flux density * Simple polarity distinction method of mounting magnet to product incorporating Hall IC Magnet Plastic bar Plastic cover Magnet for Hall IC A magnet, which is used in pair with a Hall IC, can be mounted to a product incorporating a built-in Hall IC (e.g., a cellular phone) smoothly and correctly with a simple tool. The polarity of the magnet (hereafter referred to as Hall IC magnet) will be automatically discriminated. This tool is a plastic bar, one end of which is attached with a small magnet (hereafter referred to as plastic bar magnet), as shown in the above illustration. The plastic bar magnet, the polarity of which is known, is secured on the bar with a plastic cover. When the plastic bar magnet is located close to the Hall IC magnet, the Hall IC magnet will be attracted to the plastic bar magnet. The contact side of the Hall IC magnet is different in polarity from that of the plastic bar magnet. As a matter of course, the polarity of the Hall IC magnet will be known then. The Hall IC magnet can be mounted to the appliance in this state. The attraction force of the plastic bar magnet is rather weak due to the plastic cover on it. Therefore, the plastic bar can be separated from the Hall IC magnet with ease after the Hall IC magnet is mounted properly. * Main characterisitcs Operating magnetic flux density Supply voltage 2.0 Ta = 25C Operating magnetic flux density Ambient temperature 6 VCC = 3.0 V Sample 1 BH-L Operating magnetic flux density B (mT) Sample 1 BW 1.5 Sample 2 BW 1.0 Sample 3 BW Operating magnetic flux density B (mT) 5 Sample 3 BH-L Sample 1 B L-H 4 Sample 2 BH-L 3 Sample 3 B L-H 0.5 Sample 2 BL-H 2 -25 0 25 50 75 0 2 2.5 3 3.5 4 4.5 5 Supply voltage VCC (V) Ambient temperature Ta (C) 28 Hall IC I Technical Data (continued) * Main characterisitcs Operating magnetic flux density Supply voltage 6 Sample 2 BH-L AN48810B Average consumption current Supply voltage 25 5 Average consumption current ICCAVE (A) Ta = 25C Output = High Operating magnetic flux density B (mT) Sample 2 BL-H 20 4 Sample 1 BH-L Sample 1 BL-H 15 3 2 Sample 3 BH-L Sample 3 BL-H 10 -50C 25C 5 125C 1 0 2 2.5 3 3.5 4 4.5 5 0 0 1 2 3 4 5 6 Supply voltage VCC (V) Supply voltage VCC (V) Low-level output voltage Supply voltage 0.07 125C 75C 0.05 25C 0.04 0.03 0.02 0.01 0.00 0 1 2 3 4 5 6 -25C -50C IO = 2 mA Low-level output voltage Ambient temperature 0.07 VCC = 3.0 V Low-level output voltage VOL (V) Low-level output voltage VOL (V) 0.06 0.06 0.05 0.04 0.03 0.02 0.01 0.00 -50 -25 0 25 50 75 100 125 Supply voltage VCC (V) Ambient temperature Ta (C) high-level output voltage Supply voltage 0.14 125C IO = -2 mA high-level output voltage Ambient temperature 0.14 VCC = 3.0 V hgh-level output voltage VOH (V) 0.12 0.10 0.08 0.06 0.04 0.02 0.00 0 1 75C 25C -25C -50C hgh-level output voltage VOH (V) 0.12 0.10 0.08 0.06 0.04 0.02 0.00 -50 2 3 4 5 6 -25 0 25 50 75 100 125 Supply voltage VCC (V) Ambient temperature Ta (C) 29 |
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