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A3212 Datasheet(PDF) 1 Page - Allegro MicroSystems |
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A3212 Datasheet(HTML) 1 Page - Allegro MicroSystems |
1 / 13 page The A3212 integrated circuit is an ultra-sensitive, pole independent Hall-effect switch with a latched digital output. This sensor is especially suited for opera- tion in battery-operated, hand-held equipment such as cellular and cordless telephones, pagers, and palmtop computers. A 2.5 volt to 3.5 volt operation and a unique clocking scheme reduce the average operating power requirements to less than 15 µW with a 2.75 volt supply. Unlike other Hall-effect switches, either a north or south pole of sufficient strength will turn the output on; in the absence of a magnetic field, the output is off. The polarity independence and minimal power requirement allow these devices to easily replace reed switches for superior reliability and ease of manu- facturing, while eliminating the requirement for signal conditioning. Improved stability is made possible through chopper stabilization (dynamic off- set cancellation), which reduces the residual offset voltage normally caused by device overmolding, temperature dependencies, and thermal stress. This device includes on a single silicon chip a Hall-voltage generator, small-sig- nal amplifier, chopper stabilization, a latch, and a MOSFET output. Advanced BiCMOS processing is used to take advantage of low-voltage and low-power requirements, component matching, very low input-offset errors, and small com- ponent geometries. Four package styles provide magnetically optimized solutions for most appli- cations. Miniature low-profile surface-mount package types EH and EL (0.75 and 0.50 mm nominal height) are leadless, LH is a leaded low-profile SMD, and UA is a three-lead SIP for through-hole mounting. Each package is available in a lead (Pb) free version (suffix, –T) with 100% matte tin plated lead- frame. EL package for limited release, engineering samples available. FEATURES ■ Micropower Operation ■ Operation with North or South Pole ■ 2.5 V to 3.5 V Battery Operation ■ Chopper Stabilized Superior Temperature Stability Extremely Low Switch-Point Drift Insensitive to Physical Stress ■ ESD Protected to 5 kV ■ Solid-State Reliability ■ Small Size ■ Easily Manufacturable with Magnet Pole Independence A3212 ABSOLUTE MAXIMUM RATINGS Supply Voltage, VDD .............................. 5 V Magnetic Flux Density, B .......... Unlimited Output Off Voltage, VOUT ...................... 5 V Output Current, IOUT ........................... 1 mA Junction Temperature, TJ ................ +170°C Operating Temperature, TA Range 'E-' .................... -40°C to +85°C Range 'L-' .................. -40°C to +150°C Storage Temperature Range, TS .............................. -65°C to +170°C Caution: These CMOS devices have input static protection (Class 3) but are still sus- ceptible to damage if exposed to extremely high static electrical charges. MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCH 2 x 2 mm MLPD Package A3212EELLT-T Approximate actual size |
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