3209
AND
3210
Package Suffix ‘LH’ Pinning
(SOT23W)
3
MICROPOWER, ULTRA-SENSITIVE
HALL-EFFECT SWITCHES
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.
Data Sheet
27622.60B
V
DD
1
GROUND
SUPPLY
2
OUTPUT
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
at T
A
= +25
°
C
Supply Voltage, V
DD
.............................
5 V
Magnetic Flux Density, B ..........
Unlimited
Output Off Voltage, V
OUT
.....................
5 V
Output Current, I
OUT
..........................
1 mA
Junction Temperature, T
J
...............
+170
°
C
Operating Temperature Range,
T
A
...............................
-40
°
C to +85
°
C
Storage Temperature Range,
T
S
..............................
-65
°
C to +170
°
C
Caution: These CMOS devices have input
static protection (Class 3) but are still
susceptible to damage if exposed to
extremely high static electrical charges.
D
ce
w
E
en
ne
U
er
for
IN
ref
13
T
r
32
N
Fo
A
O
or
C
—
12
IS
32
D
A
e
Dwg. PH-016-1
T
C
U
D
O
n.
R
nly
sig
P
o
de
X
FEATURES
s
s
s
s
s
U
s
s
s
s
Micropower Operation
Operate With North or South Pole
2.5 V to 3.5 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
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 .
3209
AND
3210
MICROPOWER,
ULTRA-SENSITIVE
HALL-EFFECT SWITCHES
ELECTRICAL CHARACTERISTICS with C
BYPASS
= 0.1
µ
F,
over operating voltage and temperature range (unless otherwise specified).
Limits
Characteristic
Supply Voltage Range
Output Leakage Current
Output On Voltage
Awake Time
Period
Symbol
V
DD
I
OFF
V
OUT
t
awake
t
period
A3209Ex
A3210Ex
Duty Cycle
d.c.
A3209Ex
A3210Ex
Chopping Frequency
Supply Current
(2.5
≤
V
DD
≤3.5
V)
f
C
I
DD(EN)
I
DD(DIS)
I
DD(AVG)
Chip awake (enabled)
Chip asleep (disabled)
A3209Ex, V
DD
= 2.75 V
A3209Ex, V
DD
= 3.5 V
A3210Ex, V
DD
= 2.75 V
A3210Ex, V
DD
= 3.5 V
NOTES: 1. Operate and release points will vary with supply voltage.
2. B
OPx
= operate point (output turns ON); B
RPx
= release point (output turns OFF).
3. Typical Data is at T
A
= +25°C and V
DD
= 2.75 V and is for design information only.
Test Conditions
Operating
1)
V
OUT
= 3.5 V, B
RPN
< B < B
RPS
I
OUT
= 1 mA, V
DD
= 2.5 V
Min.
2.5
–
–
30
240
30
–
–
–
0.1
1.0
–
–
–
–
Typ.
2.75
«1.0
105
60
480
60
12.5
0.10
340
–
10
145
195
8.8
13
Max.
3.5
1.0
300
90
720
90
–
–
–
3.0
50
425
425
25
60
Units
V
µA
mV
µs
µs
ms
%
%
kHz
mA
µA
µA
µA
µA
µA
MAGNETIC CHARACTERISTICS with C
BYPASS
= 0.1
µ
F,
over operating voltage and temperature range (unless otherwise specified).
Limits
Characteristic
Operate Points
Symbol
B
OPS
B
OPN
Release Points
B
RPS
B
RPN
Hysteresis
B
hys
Test Conditions
South pole to branded side
North pole to branded side
South pole to branded side
North pole to branded side
|B
OPx
- B
RPx
|
Min.
–
-60
5.0
–
–
Typ.
30
-35
22
-27
7.7
Max.
60
–
–
-5.0
–
Units
G
G
G
G
G
NOTES: 1. As used here, negative flux densities are defined as less than zero (algebraic convention) and -50 G is less than +10 G.
2. Typical Data is at T
A
= +25°C and V
DD
= 2.75 V and is for design information only.
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