Production£º

The A3212 integrated circuit is an ultra-sensitive, pole in de pen dent Hall-effect
switch with a latched digital output. This sensor is es pe cial ly suited for opera-
tion in battery-operated, hand-held equip ment such as cellular and cordless
tele phones, pagers, and palmtop com put ers. A 2.5 volt to 3.5 volt operation and a
unique clocking scheme reduce the average op er at ing power requirements to less
than 15 ?W with a 2.75 volt supply.
Unlike other Hall-effect switches, either a north or south pole of suf fi cient
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 de pen den cies, and thermal stress.
This device includes on a single silicon chip a Hall-voltage generator, small-sig-
nal amplifier, chopper sta bi li za tion, 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 provide magnetically op ti mized solutions for most ap pli -
ca tions. 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 mount ing. Each package is
available in a lead (Pb) free version (suffix, ¨CT) with 100% matte tin plated lead-
frame. EL package for limited release, engineering samples available.
FEATURES
¡ö Micropower Operation
¡ö Operation with North or South Pole
¡ö 2.5 V to 3.5 V Battery Operation
¡ö Chopper Stabilized
Superior Temperature Stability
Extremely Low Switch-Point Drift
Insensitive to Physical Stress
¡ö ESD Protected to 5 kV
¡ö Sol id-State Reliability
¡ö Small Size
¡ö Easily Manufacturable with Magnet Pole Independence

ALLEGRO_A3212ELHLT-T.pdf

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