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3214 Datasheet(PDF) 1 Page - Allegro MicroSystems |
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3214 Datasheet(HTML) 1 Page - Allegro MicroSystems |
1 / 11 page The A3213xx and A3214xx integrated circuits are ultra-sensitive, pole independent Hall-effect switches with a latched digital output. They are especially suited for operation in battery-operated, hand-held equipment such as cellular and cordless telephones, pagers, and palmtop computers. A 2.4 volt to 5.5 volt operation and a unique clocking scheme reduce the average oper- ating power requirements – the A3213xx to 825 µW, the A3214xx to 14 µW (typical at 2.75 V)! Except for operating duty cycle and average operating current, the A3213xx and A3214xx are identical. 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 allows these devices to easily replace reed switches for superior reliability and ease of manufacturing, while eliminating the requirement for signal conditioning. Improved stability is made possible through chopper stabilization (dy- namic offset cancellation), which reduces the residual offset voltage normally caused by device overmolding, temperature dependencies, and thermal stress. These devices include on a single silicon chip a Hall-voltage generator, small-signal 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 component geometries. Range 'E' devices are rated for operation over a temperature range of -40°C to +85°C; range 'L' devices are rated for operation over a temperature range of -40°C to +150°C. Two package styles provide a magnetically opti- mized package for most applications. ‘LH’ is a miniature low-profile surface- mount package, ‘UA’ is a three-lead SIP for through-hole mounting. Each package is available in a lead (Pb) free version (suffix, –T) , with a 100% matte tin plated leadframe. FEATURES ■ Micropower Operation ■ Operate With North or South Pole ■ 2.4 V to 5.5 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 Package Designator ‘LH’ Pinning (SOT23W) 3213 AND 3214 ABSOLUTE MAXIMUM RATINGS at TA = +25°C Supply Voltage, VDD .............................. 6 V Magnetic Flux Density, B .......... Unlimited Output Off Voltage, VOUT ...................... 6 V Output Current, IOUT ........................... 1 mA Junction Temperature, TJ ................ +170°C Operating Temperature Range, TA Suffix 'E' ...................... -40°C to +85°C Suffix '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. Pinning is shown viewed from branded side. MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES Dwg. PH-016-1 V DD 12 3 |
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