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3425 Schematic ( PDF Datasheet ) - Allegro MicroSystems

Teilenummer 3425
Beschreibung DUAL/ CHOPPER-STABILIZED/ ULTRA-SENSITIVE/ BIPOLAR HALL-EFFECT SWITCH
Hersteller Allegro MicroSystems
Logo Allegro MicroSystems Logo 




Gesamt 12 Seiten
3425 Datasheet, Funktion
3425
DUAL, CHOPPER-STABILIZED, ULTRA-SENSITIVE,
BIPOLAR HALL-EFFECT SWITCH
V CC
12
34
Dwg. PH-017
Pinning is shown viewed from branded side.
PRELIMINARY INFORMATION
(subject to change without notice)
August 21, 2000
ABSOLUTE MAXIMUM RATINGS
at TA = +25°C
Supply Voltage, VCC ........................ 26.5 V
Reverse Battery Voltage, VRCC .......... -18 V
Zener Current, IZ ............................ 100 mA
Magnetic Flux Density, B ........... Unlimited
Output Off Voltage, VOUT .................... VCC
Output Current, IOUT ........................ 30 mA
Reverse Output Current, IOUT ........ -50 mA
Package Power Dissipation, PD . See Graph
Junction Temperature, TJ ............... +170°C
Operating Temperature Range,
TA, ............................ -40°C to +150°C
Storage Temperature Range,
TS .............................. -65°C to +170°C
The A3425LK dual Hall-effect switch is an extremely
temperature-stable and stress-resistant sensor especially suited for use in
digital-encoder systems in the harsh environments of automotive or
industrial applications over extended temperature ranges to +150°C.
Superior high-temperature performance is made possible through
dynamic offset cancellation, which reduces the residual offset voltage
normally caused by device overmolding, temperature dependencies, and
thermal stress. This device also eliminates the major manufacturing
hurdles encountered in fine-pitch direction-detection applications,
namely maintaining accurate mechanical location between the two active
Hall elements. Here, the two Hall elements are photolithographically
aligned to better than 1 µm, as contrasted with 100 µm or worse me-
chanical location tolerance when manufactured discretely. The
A3425LK is an ultra-sensitive device optimized for use with high-
density ring magnets.
The device includes on a single silicon chip a voltage regulator, two
independent chopper-stabilized Hall-voltage generators , two small-
signal amplifiers, two Schmitt triggers, and two short-circuit protected
open-collector outputs to sink up to 30 mA each. An on-board regulator
permits operation with supply voltages of 3.3 to 26.5 volts. With
suitable output pull ups, it can be used directly with bipolar or MOS
logic circuits.
The A3425LK dual Hall-effect switch is supplied in a 4-pin plastic
SIP for operation over a temperature range of -40°C to +150°C. A
similar device, with on-chip logic processing specifically for direction
detection applications, in a 5-pin SIP, is the A3422LKA.
FEATURES
I Two Matched Hall Switches On A Single Substrate
I 1 mm Sensor-to-Sensor Spacing
I Superior Temperature Stability
I Resistant to Physical Stress
I Output Short-Circuit Protection
I Operation From Unregulated Supply
I Reverse Battery Protection
I Solid-State Reliability
I Integrated ESD Protection on Outputs and Supply
Always order by complete part number, e.g., A3425LK .






3425 Datasheet, Funktion
3425
DUAL, CHOPPER-STABILIZED,
ULTRA-SENSITIVE,
BIPOLAR HALL-EFFECT SWITCH
CRITERIA FOR DEVICE QUALIFICATION
All Allegro sensors are subjected to stringent qualification requirements prior to being released to production.
To become qualified, except for the destructive ESD tests, no failures are permitted.
Qualification Test
Test Method and Test Conditions
Biased Humidity (HAST) JESD22-A101,
TA = 85°C, RH = 85%
High-Temperature
Operating Life (HTOL)
JESD22-A108,
TA = 150°C, TJ = 165°C
Accelerated HTOL
TA = 170°C, TJ = 180°C
Test Length Samples
1000 hrs
77
1000 hrs
77
168 hrs
77
Comments
VCC = VOUT = 3.3 V
Autoclave, Unbiased
High-Temperature
(Bake) Storage Life
Temperature Cycle
ESD,
Human Body Model
JESD22-A102, Condition C,
MIL-STD-883, Method 1008,
TA = 170°C
MIL-STD-883, Method 1010,
-55°C to +150°C
CDF-AEC-Q100-002
96 hrs
1000 hrs
77
77
1000 cycles
77
Pre/Post
Reading
x per
test
Test to failure,
All leads > TBD
115 Northeast Cutoff, Box 15036
6 Worcester, Massachusetts 01615-0036 (508) 853-5000

6 Page









3425 pdf, datenblatt
3425
DUAL, CHOPPER-STABILIZED,
ULTRA-SENSITIVE,
BIPOLAR HALL-EFFECT SWITCH
HALL-EFFECT SENSORS
Partial Part Avail. Oper.
Characteristics at TA = +25°C
Number
Temp.
BOP max BRP min Bhys typ
Features
GEARTOOTH/RING MAGNET (DUAL ELEMENT) HALL-EFFECT SENSORS in order of BOP
3060
3422
3059
3056
3058
3421
K/S
E/L
K/S
E/L
E/L
E/L
+35
+75
+100
+150
+250
+280
-35
-75
-100
-150
-250
-280
30 ac coupled
46 direction detection
130 ac coupled
50 zero-speed
200 zero-speed
335 direction detection
SPECIAL-PURPOSE HALL-EFFECT SENSORS
3054
3209
3210
3421
3422
3425
K/S
E
E
E/L
E/L
L
+300
±60
±60
+280
+85
+24
+5.0
±5.0
±5.0
-280
-85
-24
50 unipolar switch, multiplexed
7.7 400 µW, chopper stabilized
7.7 25 µW, chopper stabilized
335 direction detection
46 direction detection
19 dual, chopper stabilized
Operating Temperature Ranges:
S = -20°C to +85°C, E = -40°C to +85°C, J = -40°C to +115°C, K = -40°C to +125°C, L = -40°C to +150°C
Notes 1. Protected.
6. Multiplexed two-wire sensor; after proper address, power/signal bus current indicates magnetic field condition.
Notes
6
1
The products described herein are manufactured under one or
more of the 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; and other patents
pending.
Allegro MicroSystems, Inc. reserves the right to make, from time to
time, such departures from the detail specifications as may be
required to permit improvements in the performance, reliability, or
manufacturability of its products. Before placing an order, the user is
cautioned to verify that the information being relied upon is current.
Allegro products are not authorized for use as critical components
in life-support appliances, devices, or systems without express written
approval.
The information included herein is believed to be accurate and
reliable. However, Allegro MicroSystems, Inc. assumes no responsi-
bility for its use; nor for any infringements of patents or other rights of
third parties that may result from its use.
115 Northeast Cutoff, Box 15036
12 Worcester, Massachusetts 01615-0036 (508) 853-5000

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