AN48800A

Individual Specification AN48800A Low current consumption, high sensitivity CMOS Hall IC One-way magnetic field operation 0.40+0.10 −0.05 2 1.10+0.20 −0.10  High sensitivity (6 mT max.) due to offset cancel circuit and a new sample and hold circuit  Small current by using intermittent action (10 µA typ.)  Small package (SMD)  Open drain output 0.10 0 to 0.10 1.10+0.30 −0.10 0.40±0.20 0.10 to 0.30 Seating plane MINI-3DRA (Lead-free package) ■ Applications  Flip type cellular phone, digital video camera ■ Block Diagram 1 Intermittent action VCC 2.5 V to 3.5 V 2 Out Amplifier Hall element Offset cancel Sample and hold Comparator 3 GND Note) The magnetism detection time should be longer than one intermittent action cycle (On = 200 µs and Off = 51 ms). ■ Pin Descriptions Pin No. 1 2 3 Symbol VCC Out GND Output Ground Description Power supply 20 0.11+0.10 −0.05 ■ Features 0.65±0.15 The AN48800A is a Hall IC (a magnetic sensor) which has 2 times or more sensitivity and a low current consumption of about one threehundredth 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. 0.10 M 3 1.50+0.25 −0.05 0.65±0.15 ■ Overview (1.45) Unit : mm 1 0.95 0.95 1.90±0.20 2.90+0.20 −0.05 2.80+0.20 −0.30 AN48800A ■ Absolute Maximum Ratings Parameter Supply voltage Output voltage Supply current Output current Power dissipation *1, *2 *1 Symbol VCC VOUT ICC IOUT PD Topr Tstg Rating 5 5 5 30 60 −20 to +75 −55 to +125 Unit V V mA mA mW °C °C Operating ambient temperature Storage temperature *1 Note) *1: Except for the power dissipation, operating ambient temperature and storage temperature, all ratings are for Ta = 25°C. *2: Ta = 75°C. For the independent IC without a heat sink. Please use within the range of power dissipation, refering to PD  Ta curve. ■ Recommended Operating Range Parameter Supply voltage Symbol VCC Range 2.5 to 3.5 Unit V ■ Electrical Characteristics Ta = 25°C ± 2°C Parameter Operating magnetic flux density 1 Operating magnetic flux density 2 Output voltage Output current Supply current 1 *3 *1 *2 Symbol BH-L BL-H VOL IOH ICCAVE VCC = 3 V VCC = 3 V Conditions Min  0.5    Typ   0.1  10 Max 6  0.3 10 15 Unit mT mT V µA µA VCC = 3 V, IO = 5 mA, B = 6.0 mT VCC = 3 V, VO = 3 V, B = 0.5 mT VCC = 3 V, B = 0.5 mT 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: ICCAVE = {ICCON × tON + ICCOFF × tOFF}/{tON + tOFF}  Design reference data Parameter Hysteresis width 1 Supply current 2 Supply current 3 Operating time Stop time Symbol BW ICCON ICCOFF tON tOFF VCC = 3 V VCC = 3 V, B = 0.5 mT VCC = 3 V, B = 0.5 mT VCC = 3 V VCC = 3 V Conditions Min      Typ 1.2 2 3 200 51 Max      Unit mT mA µA µs ms Note) It will operate normally in approximately 51 ms after power on. 21 Individual Specification ■ Technical Data  Position of a Hall element (unit in mm) Distance from a package surface to sensor part: 0.39 mm (reference value) A Hall element is placed on the shaded part in the figure. 0.5 1.2 0.39  Magneto-electro conversion characteristics S Output voltage BL-H BW 0.5 0.5 BH-L Applied magnetic flux density B Operating magnetic flux density N Direction of applied magnetic field  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. 22 AN48800A ■ Technical Data (continued)  Main characterisitcs AN48800A_Tokusei01 Operating magnetic flux density  Supply voltage 2.0 Ta = 25°C AN48800A_Tokusei02 Operating magnetic flux density  Ambient temperature 6 VCC = 3.0 V Sample 1 BH-L Operating magnetic flux density B (mT) 1.5 Operating magnetic flux density B (mT) Sample 1 BW 5 Sample 3 BH-L Sample 2 BW 1.0 Sample 3 BW 4 Sample 1 BL-H Sample 2 BH-L 3 0.5 Sample 3 BL-H Sample 2 BL-H 0 2 2.5 3 3.5 4 4.5 5 2 −25 0 25 50 75 Supply voltage VCC (V) AN48800A_Tokusei03 Operating magnetic flux density  Supply voltage 6 Sample 2 BH-L Ambient temperature Ta (°C) AN48800A_Tokusei04 Average consumption current  Supply voltage 25 Output = High Ta = 25°C 5 Sample 2 BL-H Average consumption current ICCAVE (µA) Operating magnetic flux density B (mT) 20 4 Sample 1 BH-L Sample 1 BL-H 15 3 2 Sample 3 BH-L Sample 3 BL-H 10 −50°C 25°C 5 125°C 1 0 2 2.5 3 3.5 4 4.5 5 0 0 1 2 3 4 5 6 Supply voltage VCC (V) AN48800A_Tokusei05 Low-level output voltage  Supply voltage 0.20 IO = 5 mA AN48800A_Tokusei06 Low-level output voltage  Ambient temperature 0.14 VCC = 3.0 V 0.12 Supply voltage VCC (V) Low-level output voltage VOL (V) 0.15 75°C 0.10 25°C −25°C −50°C 0.05 Low-level output voltage VOL (V) 0.10 0.08 0.06 0.04 0.02 0.00 0 1 2 3 4 5 6 0.00 −50 −25 0 25 50 75 100 125 Supply voltage VCC (V) Ambient temperature Ta (°C) 23