Update: 02 October, 2023
The A3211 and A3212 integrated circuits are ultra-sensitive, pole indepen- dent Hall-effect switches with latched digital output. These sensors are es- pecially suited for operation in battery-operated, hand-held equipment such as cellular and cordless tele- phones, pagers, and palmtop comput- ers. A 2.5 volt to 3.5 volt operation and a unique clocking scheme reduce the average op- erating 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 suf- ficient strength will turn the output on in the A3212, and in the absence of a magnetic field, the output is off. The A3211 provides an inverted output. The po- larity inde- pendence and minimal power requirements allow these devices to easily replace reed switches for superior reliability and ease of manufacturing, while eliminat- ing the requirement for signal conditioning. Improved stability is made possible through chopper stabilization (dynamic offset cancellation), which reduces the residual offset voltage normally caused by device overmolding, temperature depen- dencies, and thermal stress. This device includes on a single silicon chip a Hall-voltage generator, small-sig- nal amplifier, chopper sta- bilization, a latch, and a MOSFET output. Ad vanced 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 provid- ed offer different sizes and cost.
File format: PDF
Size: -
MD5 Checksum: 1EF9EE31387E6EBCDCC9114509644760
Publication date: 10 July, 2012
Downloads: -
PDF Link: Allegro A3211 A3212 Manual(1) PDF