ALLEGRO ATS635LSE User Manual

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ATS635LSE and ATS636LSE
PACKAGE DIAGRAM
Pin 1 = VCC Pin2=VOUT Pin3=NoConnect Pin 4 = GND
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC………………….…….. 28 V* Reverse Supply Voltage, V Overvoltage Supply Current, I Output Off Voltage, V Output Sink Current, I
OUT……
OUT
Magnetic Flux Density, B…………… Unlimited Package Power Dissipation, P Operating Temperature Range, T
Suffix “L”………...……….. -40°Cto+150°C
Junction Temperature, T Storage Temperature Range
………………………… -65°Cto+170°C
T
S
…………… -18 V
RCC
…..……100 mA
CC
……………… 26.5V
…...…………. 20 mA
….. See Graph
D
A
……..…………..165 °C
J
Programmable Back Biased Hall-Effect
Switch with TPOS Functionality
The ATS635LSE and ATS636LSE programmable, true power-on state (TPOS), sensors are an optimized Hall-effect IC and magnet combination that switch in response to magnetic signals created by ferrous targets in gear-tooth sensing and proximity applications.
The devices are externally programmable. A wide range of programmability is available on the magnetic operate point (B hysteresis remains fixed. This advanced feature allows for optimization of the sensor switch point and can drastically reduce the effects of mechanical placement tolerances found in production environments .
A proprietary dynamic offset cancellation technique, with an internal high-frequency clock, reduces the residual offset voltage, which is normally caused by device overmolding, temperature dependencies, and thermal stress. Having the Hall element and amplifier in a single chip minimizes many problems normally associated with low-level analog signals.
This sensor system is ideal for use in gathering speed or position information using gear-tooth-based configurations, or for proximity sensing with ferrous targets.
The ATS635LSE switches HIGH in the presence of a ferrous target or tooth and switches LOW in the presence of a target valley, window, or when the ferrous target is removed. The ATS636LSE has the opposite polarity and switches LOW in the presence of a ferrous target or tooth and switches HIGH in the presence of a target valley, window, or when the ferrous target is removed.
These devices are available in lead (Pb) free versions, with 100% matte tin leadframe plating.
FEATURES
Chopper Stabilization
Extremely low switch-point drift over temperature
On-chip Protection
Supply transient protection Output short-circuit protection Reverse-battery protection
True Zero-Speed OperationTrue Power-On StateSingle-chip Sensing IC for High ReliabilityOptimized Magnetic CircuitWide Operating Voltage RangeInternal Regulator
Use the following complete part numbers when ordering:
) while the
OP
*Fault conditions that produce supply voltage transients will be clamped by an internal Zener diode. These conditions can be tolerated but should be avoided.
Internal current limiting is intended to protect the device from output short circuits, but is not intended for continuous operation.
ATS635LSE-DS
Part Number Pb-Free Output
Packing*
(Tooth)
ATS635LSETN-T Yes High 13-in. reel, 450 pieces/reel
ATS636LSETN-T Yes Low 13-in. reel, 450 pieces/reel
*Contact Allegro for additional packing options.
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
ATS635LSE and ATS636LSE
PROGRAMMABLE TRUE POWER-ON HALL-EFFECT GEAR-TOOTH SWITCHES
CHARACTERISTICS
ELECTRICAL CHARACTERISTICS over operating voltage and junction temperature range (unless otherwise noted)
Characteristics Symbol Test Conditions
Limits
Min. Typ. Max. Units
Supply Voltage1 VCC Operating 4.2 24 V
After programming
Power-Up State POS
V
= 0 à V
CC
B < BOP ATS636
CC(min)
, t > t
:
ON
HIGH HIGH HIGH
B < BOP ATS635 LOW LOW LOW
Low Output Voltage V
Output Current Limit2 I
Output Leakage Current I
OUT(SAT)
Output on, I
OUTM
Output off, V
OFF
Pulse test method
= 20 mA 175 400 mV
OUT
Output on
OUT
30 50 90 mA
= 24 V 10 µA
Output off (HIGH) 2.5 5.5 mA
Supply Current I
CC
Output on (LOW) 2.5 5.5 mA
Reverse Supply Current I
Power-On Delay3 tON Output off; VCC > V
V
RCC
= -18V -5 mA
RCC
35 50 µs
CC(min)
Output Rise Time tr RL = 820 , CL = 10 pF 1.2 5 µs
Output Fall Time tf RL = 820 , CL = 10 pF 1.2 5 µs
Sampling Frequency f
Supply Zener Voltage V
Output Zener Voltage V
Supply Zener Current4 I
Output Zener Current I
- 250 - kHz
Sample
Zsupply
ZOutput
VS = 28 V
Zsupply
VO = 30 V
ZOutput
ICC = I
I
+ 3 mA
CC(max)
TA = 25°C
= 3 mA
OUT
TA = 25°C
28 V
30 V
8.5 mA
3
mA
Note: Typical data is at VCC = 12 V and TA = +25°C.
1
Do not exceed the maximum thermal junction temperature: see power de-rating curve.
2
Short circuit protection is not intended for continuous operation and is tested using pulses.
3
The power on delay is the time that is necessary before the output signal is valid
4
The maximum spec limit for this parameter is equivalent to I
CC(max)
+ 3 mA
Page 2 of 15
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 2005 Allegro MicroSystems, Inc.
ATS635LSE and ATS636LSE
PROGRAMMABLE TRUE POWER-ON HALL-EFFECT GEAR-TOOTH SWITCHES
MAGNETIC CHARACTERISTICS over operating voltage and junction temperature range using reference target (Unless otherwise noted)
Limits
Characteristics Symbol Test Conditions
Switch Point 7 Bit Number of Programming Bits
-
Switch Point Polarity 1 Bit
Programming Lock 1 Bit
Gear Tooth Sensor / Proximity Sensing Characteristi cs (Low Switchpoint Only)
1
Programming Air Gap
Range
Programming Resolution
2
Air Gap Drift Over Full
Temperature Range
AG
AG
AG
Range
Res
Drift
Temp: 25°C Code –127
Temp: 25°C Code +127
Temperature: 25°C
Program Air Gap = 2.5 mm
Device Programmed
to 2.5 mm
Over Tooth (ATS635LSE) HIGH
Over Valley (ATS635LSE) LOW
Polarity P
Over Tooth (ATS636LSE) LOW
Over Valley (ATS636LSE) HIGH
1400
1200
1000
800
600
400
Flux Density (Gauss)
200
0
0 30 60 90 120 150 180 210 240 270 300 330 360
Reference Target Flux Density vs. Position: Typical
Reference Target Flux Density vs. Position
Position (º)
0.25
0.50
0.75
1.00
1.25
1.50
1.75
2.00
2.25
2.50
2.75
3.00
3.25
3.50
3.75
4.00
4.25
4.50
4.75
5.00
5.25
5.50
5.75
6.00
1400
1200
1000
800
600
400
Flux Density [Gauss]
200
0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Reference Target Tooth and Valley Field vs. Air Gap
Min. Typ. Max. Units
2.5 mm
1.5 mm
0.05 mm
0.2 mm
Tooth and Valley Field vs. Air Gap
Reference Target
Reference Target Tooth
Reference Target Valley
Air Gap [mm]
1
The switch point will vary over temperature. A sufficient margin obtained through customer testing is required to guarantee functionality over temperature. Programming at larger air gaps leaves no safety margin for switchpoint drift. See the applications note: “Proximity Sensing Programming Technique” http://www.allegromicro.com/techpub2/proximity_sensing/ or visit the Allegro website at http://www.allegromicro.com for additional information.
2
The switch point will vary over temperature, proportionally to the programmed air gap. This parameter is based on characterization data and is not a tested parameter in production. Switch point air gap generally drifts downward as temperature increases.
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 2005 Allegro MicroSystems, Inc.
ATS635LSE and ATS636LSE
PROGRAMMABLE TRUE POWER-ON HALL-EFFECT GEAR-TOOTH SWITCHES
REFERENCE TARGET DIMENSIONS
Outside
Target
Reference Target 120mm 6mm 23.5mm 23.5mm 5mm
Diameter
(Do)
Face Width
(F)
Reference Target
Reference Target
GEAR PARAMETERS FOR CORRECT OPERATION
Characteristic Description
Tooth Whole Depth (ht) Depth of Target Valley 5 mm Circular Valley Length (PC – T) Length of Target Valley 13 mm Circular Tooth Length (T) Length of Target Tooth 5 mm Face Width (F) Thickness or Width of Target Tooth 5 mm
MATERIAL: CRS 1018
Circular Tooth
Length
(T)
Circular Valley
Length
(PC – T)
Limits
Min. Typ. Max. Units
Tooth Whole
Depth
(ht)
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 2005 Allegro MicroSystems, Inc.
ATS635LSE and ATS636LSE
PROGRAMMABLE TRUE POWER-ON HALL-EFFECT GEAR-TOOTH SWITCHES
ELECTROMAGNETC CAPABILITY (EMC) PERFORMANCE
Please contact Allegro MicroSystems for EMC performance
Test Name Reference Specification
ESD – Human Body Model AEC-Q100-002 ESD – Machine Model AEC-Q100-003 Conducted Transients ISO 7637-1
Direct RF Injection ISO 11452-7
Bulk Current Injection ISO 11452-4 TEM Cell ISO 11452-3
Clock/Logic
FUNCTIONAL BLOCK DIAGRAM
Program / Lock
Programmming
Logic
AMP S/H LPF
Offset Adjust
Reg
Current
Limit
VCC
To all subcircuits
OUT
GND
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 2005 Allegro MicroSystems, Inc.
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