The A3209Ex and A3210Ex 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. 2.5 volt to

3.5 volt operation and a unique clocking scheme to reduce the average operat-

ing power requirements – the A3209Ex to 400

µW, the A3210Ex to 25 µW!

Except for operating duty cycle and average operating current, the A3209Ex

and A3210Ex 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 (dynamic

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.

The A3209Ex and A3210Ex are rated for operation over a temperature

range of -40

°C to +85°C. Two package styles provide a magnetically opti-

mized package for most applications. Suffix ‘LH’ is a miniature low-profile

surface-mount package while suffix ‘UA’ is a three-lead ultra-mini-SIP for

through-hole or surface mounting.

FEATURES

I Micropower Operation

I Operate With North or South Pole

I 2.5 V to 3.5 V Battery Operation

I Chopper Stabilized

Superior Temperature Stability

Extremely Low Switch-Point Drift

Insensitive to Physical Stress

I ESD Protected to 5 kV

I Solid-State Reliability

I Small Size

I Easily Manufacturable With Magnet Pole Independence

Always order by complete part number: the prefix ‘A’ + the basic four-digit

part number + the suffix ‘E’ to indicate operating temperature range + a

suffix to indicate package style, e.g., A3210ELH .

Package Suffix ‘LH’ Pinning

3210

ABSOLUTE MAXIMUM RATINGS

Magnetic Flux Density, B .......... Unlimited

Operating Temperature Range,

Storage Temperature Range,

Caution: These CMOS devices have input

static protection (Class 3) but are still

susceptible to damage if exposed to

extremely high static electrical charges.

Pinning is shown viewed from branded side.

MICROPOWER, ULTRA-SENSITIVE

HALL-EFFECT SWITCHES

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