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A1171EEWLT-P

P1-P3P4-P6P7-P9P10-P10
Description
The A1171 integrated circuit is an ultrasensitive, Hall effect
switch with latched digital outputs and either unipolar or
omnipolar magnetic actuation. It features operation at low
supply currents and voltages, making it ideal for battery-
operated electronics. The low operating supply voltage,
1.65 to 3.5 V, and unique clocking algorithm assist in reducing
the average operating power consumption. For example, the
power requirement is less than 15 μW with a 2.75 V supply.
Unlike more traditional Hall effect switches, the A1171 allows
the user to configure how the device is magnetically actuated.
Under default conditions the device activates output switching
with either a north or south polarity magnetic field of sufficient
strength. The magnetic actuation can be set via an external
selection pin to operate in a unipolar mode, switching only on
a north or south polarity but not both. Furthermore, the output
of the A1171 can be configured to switch either off or on in the
absence of any significant magnetic field. Lastly, the A1171
has two push-pull output structures.
This polarity-independence, as well as the minimal power
requirements, allows the A1171 to easily replace reed switches,
1171-DS, Rev. 5
Features and Benefits
▪ 1.65 to 3.5 V battery operation
▪ Low supply current
▪ High sensitivity, B
OP
typically 30 G (3.0 mT)
▪ Operation with either north or south pole
▪ Configurable unipolar or omnipolar magnetic sensing
▪ Complementary, push-pull outputs
▪ Chopper stabilized
▫ Superior temperature stability
▫ Extremely low switchpoint drift
▫ Insensitive to physical stress
▪ Solid state reliability
▪ Small size
Micropower Ultrasensitive Hall Effect Switch
Continued on the next page…
Package: 6 pin DFN/MLP (suffix EW)
Functional Block Diagram
Not to scale
A1171
Dynamic Offset
Cancellation
VOUTPN
VOUTPS
VDD
Low-Pass
Filter
Clock
/
Logic
Latch
Latch
Logic
Amp
GND
SELECT
Sample and Hold
and Averaging
Micropower Ultrasensitive Hall Effect Switch
A1171
2
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
providing superior reliability and ease of manufacturing while
eliminating the requirement for signal conditioning.
Improved stability is made possible through dynamic offset
cancellation using chopper stabilization, which reduces the residual
offset voltage normally caused by device overmolding, temperature
dependencies, and thermal stress. This device includes, on a single
silicon chip, a Hall-voltage generator, a small-signal amplifier,
chopper stabilization, a latch, and a MOSFET output.
The A1171 device offers a magnetically optimized solution, suitable
for most applications. Package type EW (0.40 mm maximum height)
offers a leadless surface mount solution. It is lead (Pb) free, with
NiPdAu leadframe plating.
Description (continued)
Pin-out Diagram
Absolute Maximum Ratings
Characteristic Symbol Notes Rating Units
Supply Voltage V
DD
5 V
Reverse Supply Voltage V
RDD
–0.3 V
Magnetic Flux Density B Unlimited G
Output Off Voltage V
OUTPx
5 V
Reverse Output Voltage V
ROUTPx
–0.3 V
Output Current
I
OUTPx(Source)
1 mA
I
OUTPx(Sink)
–1 mA
Operating Ambient Temperature T
A
Range E –40 to 85 ºC
Maximum Junction Temperature T
J
(max) 165 ºC
Storage Temperature T
stg
–65 to 170 ºC
Terminal List Table
Name Number Function
VOUTPS 1
Push-pull output (selectable omnipolar activation or unipolar
south pole activation)
VOUTPN 2
Push-pull output (selectable inverted omnipolar activation or
unipolar north pole activation)
SELECT 3
Sets activation mode for VOUTPx outputs; omnipolar output
when tied to VDD or floating, unipolar output when grounded
GND 4 Ground
NC 5 No connection
VDD 6 Connects power supply to chip
PAD – Exposed pad for enhanced thermal dissipation
VOUTPS
VOUTPN
SELECT
VDD
NC
GND
PAD
6
5
4
1
2
3
Selection Guide
Part Number Package Packing
1
A1171EEWLT-P
2
DFN/MLP 1.5
×
2 mm; 0.40 mm maximum height 3000 pieces per 7 inch reel
1
Contact Allegro
™
for additional packing options.
2
Allegro products sold in DFN package types are not intended for automotive applications.
Micropower Ultrasensitive Hall Effect Switch
A1171
3
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
ELECTRICAL CHARACTERISTICS valid over operating voltage and temperature range (unless otherwise specified)
Characteristic Symbol Test Conditions Min. Typ.
1
Max. Units
Supply Voltage Range
2
V
DD
Operating, T
A
= 25°C 1.65 – 3.5 V
Operating, over full ambient temperature range 1.8
Output Voltage
V
OUT(SAT)
NMOS on, I
SINK
= 1 mA, V
DD
= 2.75 V – 100 300 mV
V
OUT(HIGH)
PMOS on, I
SOURCE
= –1 mA, V
DD
= 2.75 V V
DD
–300 V
DD
–100 – mV
Period t
PERIOD
– 50 100 ms
Chopping Frequency f
C
– 200 – kHz
Supply Slew Rate
3
SR 20 – – V/ms
Supply Current
I
DD(EN)
Device in awake mode (enabled) – – 2.0 mA
I
DD(DIS)
Device in sleep mode (disabled) – – 8.0 µA
I
DD(AV)
V
DD
= 1.8 V, T
A
= 25°C – 3.5 8 µA
V
DD
= 3.5 V, T
A
= 25°C – 7.1 12 µA
SELECT Current
4
I
SELECT
0 1 2 µA
SELECT Voltage
4
V
SELECT(LOW)
0 –
1
/
3
V
DD
V
V
SELECT(HIGH)
2
/
3
V
DD
– V
DD
V
1
Typical data are for initial design estimations only, and assume optimum manufacturing and application conditions, such as T
A
= 25°C. Performance
may vary for individual units, within the specified maximum and minimum limits.
2
Operate points, B
OPX
, and release points, B
RPX
, vary with supply voltage.
3
If SR < SR(min), then valid device output might be delayed for one Period, t
PERIOD
, of device.
4
Maximum V
DD
, minimum 0 V.
MAGNETIC CHARACTERISTICS valid at 1.8 V ≤ V
DD
≤ 3.5 V and T
A
= 25°C
Characteristic Symbol Test Conditions Min. Typ.
1
Max. Units
2
Operate Point
3
B
OPS
– 32 55 G
B
OPN
–55 –32 – G
Release Point
3
B
RPS
6 26 – G
B
RPN
– –26 –6 G
Hysteresis B
HYS
|B
OPX
- B
RPX
| – 6 – G
1
Typical data are for initial design estimations only, and assume optimum manufacturing and application conditions, such as T
A
= 25°C. Performance
may vary for individual units, within the specified maximum and minimum limits.
2
1 gauss (G) is exactly equal to 0.1 millitesla (mT).
3
Operate points, B
OPX
, and release points, B
RPX
, vary with supply voltage.
P1-P3P4-P6P7-P9P10-P10

A1171EEWLT-P

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MAGNETIC SWITCH OMNIPOLAR 6DFN
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