3213
AND
3214
Package Designator ‘LH’ Pinning
(SOT23W)
MICROPOWER, ULTRA-SENSITIVE
HALL-EFFECT SWITCHES
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.
Data Sheet
27622.62F
3
V
DD
1
SUPPLY
GROUND
2
OUTPUT
Dwg. PH-016-1
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
at T
A
= +25°C
Supply Voltage, V
DD
..............................
6 V
Magnetic Flux Density, B ..........
Unlimited
Output Off Voltage, V
OUT
......................
6 V
Output Current, I
OUT
...........................
1 mA
Junction Temperature, T
J
................
+170°C
Operating Temperature Range, T
A
Suffix 'E' ......................
-40°C to +85°C
Suffix 'L' ...................
-40°C to +150°C
Storage Temperature Range,
T
S
..............................
-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.
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
ALLEGRO [ ALLEGRO MICROSYSTEMS ]
