Effect Switch. A1171 Datasheet

A1171 Switch. Datasheet pdf. Equivalent

A1171 Datasheet
Recommendation A1171 Datasheet
Part A1171
Description Micropower Ultrasensitive Hall Effect Switch
Feature A1171; A1171 Micropower Ultrasensitive Hall Effect Switch Features and Benefits ▪ 1.65 to 3.5 V battery op.
Manufacture Allegro MicroSystems
Datasheet
Download A1171 Datasheet





Allegro MicroSystems A1171
A1171
Micropower Ultrasensitive Hall Effect Switch
Features and Benefits
1.65 to 3.5 V battery operation
Low supply current
High sensitivity, BOP 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
Package: 6 pin DFN/MLP (suffix EW)
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 theA1171 to easily replace reed switches,
Not to scale
Continued on the next page…
VDD
1171-DS, Rev. 5
Functional Block Diagram
Clock / Logic
Amp
Low-Pass
Filter
Latch
Latch
GND
SELECT
VOUTPS
VOUTPN



Allegro MicroSystems A1171
A1171
Micropower Ultrasensitive Hall Effect Switch
Description (continued)
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.
TheA1171 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.
Selection Guide
Part Number
Package
Packing1
A1171EEWLT-P2 DFN/MLP 1.5×2 mm; 0.40 mm maximum height
1Contact Allegrofor additional packing options.
3000 pieces per 7 inch reel
2Allegro products sold in DFN package types are not intended for automotive applications.
Absolute Maximum Ratings
Characteristic
Supply Voltage
Reverse Supply Voltage
Magnetic Flux Density
Output Off Voltage
Reverse Output Voltage
Output Current
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
Symbol
VDD
VRDD
B
VOUTPx
VROUTPx
IOUTPx(Source)
IOUTPx(Sink)
TA
TJ(max)
Tstg
Range E
Notes
Rating
5
–0.3
Unlimited
5
–0.3
1
–1
–40 to 85
165
–65 to 170
Units
V
V
G
V
V
mA
mA
ºC
ºC
ºC
Pin-out Diagram
VOUTPS 1
6 VDD
VOUTPN 2 PAD 5 NC
SELECT 3
4 GND
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
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2



Allegro MicroSystems A1171
A1171
Micropower Ultrasensitive Hall Effect Switch
ELECTRICAL CHARACTERISTICS valid over operating voltage and temperature range (unless otherwise specified)
Characteristic
Symbol
Test Conditions
Min. Typ.1 Max. Units
Supply Voltage Range2
VDD
Operating, TA= 25°C
Operating, over full ambient temperature range
1.65 – 3.5 V
1.8
Output Voltage
Period
Chopping Frequency
Supply Slew Rate3
VOUT(SAT)
VOUT(HIGH)
tPERIOD
fC
SR
NMOS on, ISINK = 1 mA, VDD = 2.75 V
PMOS on, ISOURCE = –1 mA, VDD = 2.75 V
– 100
VDD–300 VDD–100
– 50
– 200
20 –
300
100
mV
mV
ms
kHz
V/ms
Supply Current
SELECT Current4
SELECT Voltage4
IDD(EN)
Device in awake mode (enabled)
IDD(DIS) Device in sleep mode (disabled)
IDD(AV)
VDD = 1.8 V, TA = 25°C
VDD = 3.5 V, TA = 25°C
ISELECT
VSELECT(LOW)
VSELECT(HIGH)
– – 2.0 mA
– – 8.0 μA
– 3.5 8 μA
– 7.1 12 μA
0 1 2 μA
0 – 1/3VDD V
2/3VDD
VDD
V
1Typical data are for initial design estimations only, and assume optimum manufacturing and application conditions, such as TA = 25°C. Performance
may vary for individual units, within the specified maximum and minimum limits.
23OIf pSeRra<teSpRo(imntisn,),BtOhPeXn,
and release
valid device
4Maximum VDD, minimum 0 V.
points, BRPX, vary with supply voltage.
output might be delayed for one Period,
tPERIOD
,
of
device.
MAGNETIC CHARACTERISTICS valid at 1.8 V VDD 3.5 V and TA = 25°C
Characteristic
Symbol
Test Conditions
Min. Typ.1 Max. Units2
Operate Point3
Release Point3
Hysteresis
BOPS
BOPN
BRPS
BRPN
BHYS
|BOPX - BRPX|
– 32
–55 –32
6 26
– –26
–6
55
–6
G
G
G
G
G
1Typical data are for initial design estimations only, and assume optimum manufacturing and application conditions, such as TA = 25°C. Performance
may vary for individual units, within the specified maximum and minimum limits.
21 gauss (G) is exactly equal to 0.1 millitesla (mT).
3Operate points, BOPX, and release points, BRPX, vary with supply voltage.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3





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