Micropower operation Operation with either north south pole- magnetic
|
|
|
Top Searches for this datasheet
A1172 Micropower Ultra-Sensitive Hall-Effect Switch
Micropower operation Operation with either north south pole- magnetic orientation required during assembly 1.65 battery operation Chopper stabilization Superior temperature stability Extremely switchpoint drift Insensitive physical stress Solid state reliability Small size: WLCSP Complementary, push-pull outputs eliminate need pull-up resistor
A1172 ultra-sensitive, pole-independent Hall-effect switch with latched digital output. features operation supply currents voltages, making ideal batteryoperated electronics. 1.65 operating supply voltage unique clocking algorithm reduce average operating power requirements less than with 2.75 supply. A1172 push-pull output structures. Omnipolar activation output function available each output structure. such, either north south pole sufficient strength turns available outputs A1172 contains complementary outputs. Therefore, fixed magnetic field, output will high voltage state output will voltage state. Improved stability made possible through dynamic offset cancellation using chopper stabilization, which reduces residual offset voltage normally caused device overmolding, temperature dependencies, thermal stress. This device
Package: WLCSP (suffix
scale
Continued next page.
Engineering samples available limited basis. Contact your local sales applications support office additional information.
Functional Block Diagram
Clock Logic Sample Hold Dynamic Offset Cancellation Latch Low-Pass Filter
VOUTPS
Latch
VOUTPN
1172-DS, Rev.
A1172
Description (continued)
Micropower Ultra-Sensitive Hall-Effect Switch
includes, single silicon chip, Hall-voltage generator, smallsignal amplifier, chopper stabilization, latch, MOSFET output. A1172 device offers magnetically optimized solutions, suitable most applications. wafer level chip scale package (WLCSP) approximately only This package smaller than most plastic packages reduces printed circuit board area consumed micropower Hall-effect switches. Selection Guide
Part Number
A1172ECGLT
Package
Pb-free
Pb-free chip with high-temperature solder balls (RoHS compliant)
Packing*
4000 pieces reel
bumped wafer-level chip-scale package (WLCSP) *Contact Allegro additional packing options.
Absolute Maximum Ratings
Characteristic Supply Voltage Reverse Supply Voltage Output Voltage Reverse Output Voltage Output Current Magnetic Flux Density Operating Ambient Temperature Maximum Junction Temperature Storage Temperature Symbol VRDD VOUTx VROUTx IOUTx(Sink) IOUTx(Source) TJ(max) Tstg Range Notes Rating -0.3 -0.3 Unlimited Units
Terminal List Table Pin-out Diagram
Name VOUTPS VOUTPN
Number Push-pull output Inverted push-pull output Ground
Function
(Bump-down view)
Connects power supply chip
Allegro MicroSystems, Inc. Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com
A1172
Micropower Ultra-Sensitive Hall-Effect Switch
OPERATING CHARACTERISTICS
Characteristic
Supply Voltage Range2 Output Voltage Period Chopping Frequency Supply Slew Rate3
Symbol
VOUT(SAT) VOUT(HIGH) tPERIOD IDD(EN)
Test Conditions
Operating, 25°C NMOS IOUT 2.75 PMOS IOUT 2.75
Min.
1.65
Typ.1
Max.
Units
V/ms
Electrical Characteristics valid over full operating voltage range 25°C
VDD-300 VDD-100
Chip awake (enabled) Chip asleep (disabled) 1.80
Supply Current
IDD(DIS) IDD(AV)
Magnetic Characteristics4 25°C
Operate Point Release Point Hysteresis
1Typical 2Magnetic
BOPS BOPN BRPS BRPN BHYS BHYS BOPX BRPX
values 2.75 Performance vary individual units, within specified maximum minimum limits. operate release points vary with supply voltage. SR(min), then valid device output might delayed Period, PERIOD device. gauss exactly equal millitesla (mT).
Allegro MicroSystems, Inc. Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com
A1172
Micropower Ultra-Sensitive Hall-Effect Switch
THERMAL CHARACTERISTICS require derating maximum conditions*
Characteristic Package Thermal Resistance Symbol 1-layer 4-layer Test Conditions Value Units
*Additional thermal information available Allegro website.
Power Dissipation versus Ambient Temperature
1600 1400
Power Dissipation, (mW)
1200 1000
Temperature (°C)
Allegro MicroSystems, Inc. Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com
A1172
Micropower Ultra-Sensitive Hall-Effect Switch
Operating Characteristics
Saturation Voltage versus Temperature
VOUT(SAT) (mV)
1.65V 2.75V 3.5V
(°C)
Saturation Voltage versus Supply Voltage
VOUT(SAT) (mV)
85°C -40°C 25°C
Allegro MicroSystems, Inc. Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com
A1172
Micropower Ultra-Sensitive Hall-Effect Switch
Average Supply Current versus Temperature
(°C) 1.65V 2.75V 3.5V
IDD(AV) (uA)
Average Supply Current versus Supply Voltage
IDD(AV)
85°C -40°C 25°C
Allegro MicroSystems, Inc. Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com
A1172
Micropower Ultra-Sensitive Hall-Effect Switch
Period versus Temperature
tperiod (ms)
1.65V 2.75V 3.5V
(°C)
Period versus Supply Voltage
tperiod (ms)
85°C -40°C 25°C
Allegro MicroSystems, Inc. Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com
A1172
Micropower Ultra-Sensitive Hall-Effect Switch
Functional
Average Power Internal timing circuitry activates sensor deactivates remainder period ms). short awake time allows stabilization prior sensor sampling data-latching falling edge timing pulse. output during sleep state latched last sampled state. supply current affected output state.
tPeriod Awake Sleep
BOPS less than BOPN). After turn-on, output voltage VOUT(SAT). output transistor capable sinking current short circuit current limit, IOM, which minimum When magnetic field reduced below release point, BRPS increased above BRPN), device output switches high (turns off). pull-up transistor brings output voltage VOUT(HIGH). VOUTPN operates with opposite output polarity. That output (on) absence magnetic field. output goes high (turns off) when sufficient field, either north south polarity, presented device. difference magnetic operate release points hysteresis, BHYS device. This built-in hysteresis allows clean switching output even presence external mechanical vibration electrical noise.
DD(EN)
DD(DIS)
Sample Output Latched
push-pull outputs capable sourcing sinking maximum Powering-on device hysteresis region, between BOPX BRPX, allows indeterminate output state. correct state attained after first excursion beyond BOPX BRPX.
Operation
VOUTPS output switches (turns when magnetic field perpendicular Hall sensor exceeds operate point,
VOUTPS
Switch High Switch High Switch Switch VOUT(HIGH)
Switch High
VOUTPN
VOUT(HIGH) Switch High Switch Switch
VOUT
VOUT(SAT) BRPN BRPS
BHYS BHYS
VOUT
VOUT(SAT)
Figure Switching Behavior Omnipolar Switches. horizontal axis, direction indicates increasing south polarity magnetic field strength, direction indicates decreasing south polarity field strength (including case increasing north polarity).
BOPN BHYS
BOPS BHYS
Allegro MicroSystems, Inc. Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com
A1172
Micropower Ultra-Sensitive Hall-Effect Switch
Applications
strongly recommended that external bypass capacitor connected close proximity Hall sensor) between supply ground device reduce both external noise noise generated chopper stabilization technique. shown figure 0.1F capacitor typical. Extensive applications information magnets Hall-effect sensors available following notes:
Hall-Effect Applications Guide, AN27701 Hall-Effect Devices: Gluing, Potting, Encapsulating, Lead Welding Lead Forming AN27703.1 Soldering Methods Allegro Products (SMD ThroughHole), AN26009 provided Allegro Electronic Data Book, AMS-702, Allegro site, www.allegromicro.com.
CBYP Sensor Outputs VOUTPS VOUTPN
A1172
Figure Typical Application Circuit
Allegro MicroSystems, Inc. Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com
A1172
Micropower Ultra-Sensitive Hall-Effect Switch
Package 4-Bump WLCSP
0.955 ±0.020 0.955 ±0.020 .160 0.500
0.500 Layout Reference View
0.506 0.05 SEATING PLANE 0.200 ±0.030
+0.049 -0.051
0.227
0.228
Standard Branding Reference View Last digits device part number Last digit year manufacture Week manufacture
0.500
Reference Only, tooling Dimensions millimeters Exact configuration supplier discretion within limits shown Terminal mark area (substrate side) Hall element (not scale) Reference view typical layout solder pads pads minimum 0.20 from adjacent pads; adjust necessary meet application process requirements layout tolerances
0.500
Branding scale appearance supplier discretion
Copyright ©2008-2009, Allegro MicroSystems, Inc. products described herein manufactured under more following U.S. patents: 5,045,920; 5,264,783; 5,442,283; 5,389,889; 5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719; 5,686,894; 5,694,038; 5,729,130; 5,917,320; other patents pending. Allegro MicroSystems, Inc. reserves right make, from time time, such departures from detail specifications required permit improvements performance, reliability, manufacturability products. Before placing order, user cautioned verify that information being relied upon current. Allegro's products used life support devices systems, failure Allegro product reasonably expected cause failure that life support device system, affect safety effectiveness that device system. information included herein believed accurate reliable. However, Allegro MicroSystems, Inc. assumes responsibility use; infringement patents other rights third parties which result from use. latest version this document, visit website: www.allegromicro.com
Allegro MicroSystems, Inc. Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com
Other recent searches
TB31356AFL - TB31356AFL TB31356AFL Datasheet
RO4003 - RO4003 RO4003 Datasheet
LL4448 - LL4448 LL4448 Datasheet
FMS6146 - FMS6146 FMS6146 Datasheet
2SD1407A - 2SD1407A 2SD1407A Datasheet
Privacy Policy | Disclaimer
© 2012 Datasheet Archive
