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PDF ATS682LSH Data sheet ( Hoja de datos )
| Número de pieza | ATS682LSH | |
| Descripción | True Zero Speed Differential Peak-Detecting Sensor | |
| Fabricantes | Allegro Micro Systems | |
| Logotipo |  |
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ATS682LSH
Miniature, Two-Wire, True Zero Speed
Differential Peak-Detecting Sensor
Features and Benefits
www.da▪taTsrhueeetz4eur.oc-osmpeed operation
▪ Automatic Gain Control (AGC) for air gap independent
switchpoints
▪ Automatic Offset Adjustment (AOA) for signal processing
optimization
▪ Running-mode calibration for continuous optimization
▪ Precise duty cycle over operating temperature range
▪ Internal current regulator for two-wire operation
▪ Undervoltage lockout
▪ On-chip voltage regulator with wide operating voltage
range and stability in the presence of a variety of complex
load impedances
▪ Single chip IC for high reliability
Package: 4-pin SIP Module (suffix SH)
Not to scale
Description
The ATS682LSH is a Hall-effect sensing integrated circuit
and magnet combination that provides a user-friendly solution
for true zero-speed digital gear-tooth sensing in two-wire
applications. This small package, with an optimized two-wire
leadframe, can be easily assembled and used in conjunction
with a wide variety of gear shapes and sizes.
The integrated circuit incorporates a dual-element Hall-effect
sensor and signal processing that switches in response to
differential magnetic signals created by ferrous gear teeth.
The circuitry contains a sophisticated digital circuit that
reduces magnet and system offsets, calibrates the gain for air
gap independent switchpoints and provides true zero-speed
operation.
Signal optimization occurs at power-up through the adjustment
of offset and gain and is and is maintained throughout operation
with the use of a running-mode calibration scheme. Running-
mode calibration provides immunity from environmental effects
such as micro-oscillations of the sensed target or sudden air
gap changes.
The regulated current output is configured for two-wire interface
circuitry and is ideally suited for obtaining speed information in
wheel speed applications.The Hall element spacing is optimized
for high resolution, small diameter targets. The package is lead
(Pb) free, with 100% matte tin lead frame plating.
Functional Block Diagram
Hall
Amplifier
Gain
VCC
Automatic Offset
Control
AOA DAC
Tracking
DAC
Peak Hold
AGC DAC
Gain Control
ATS682-DS
Internal Regulator
Test Signals
GND
Test
1 page  
ATS682LSH
Miniature, Two-Wire, True Zero Speed
Differential Peak-Detecting Sensor
wwTwh.deartamshaeleCt4hu.acoramcteristics may require derating at maximum conditions, see Power Derating section
Characteristic
Symbol
Test Conditions*
Package Thermal Resistance
Single layer PCB, with copper limited to solder pads
RθJA Single layer PCB, with copper limited to solder pads and 3.57 in.2 (23.03
cm2) copper area each side
*Additional thermal information available on the Allegro website
Value Unit
126 ºC/W
84 ºC/W
Power Derating Curve
25
24
23
22
21
20
19
18
17
16
15
14
(RθJA= 84 °C/W)
13
12
11
(RθJA= 126 °C/W)
10
9
8
7
6
5
4
3
2
V CC(max)
V CC(min)
20 40 60 80 100 120 140 160 180
Temperature (°C)
1900
1800
1700
1600
1500
1400
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
20
Power Dissipation versus Ambient Temperature
RQJA = 84 ºC/W
RQJA = 126 ºC/W
40 60 80 100 120 140 160 180
Temperature (°C)
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
5 Page 
ATS682LSH
Miniature, Two-Wire, True Zero Speed
Differential Peak-Detecting Sensor
www.datasheet4u.com
Power Supply Protection
The device contains an on-chip regulator and can operate over a
wide VCC range. For devices that need to operate from an unregu-
lated power supply, transient protection must be added externally.
For applications using a regulated line, EMI/RFI protection may
still be required. Contact Allegro for information on the circuitry
needed for compliance with various EMC specifications. Refer to
figure 7 for an example of a basic application circuit.
Undervoltage Lockout
When the supply voltage falls below the undervoltage lockout
threshold, VCC(UV), the device enters Reset mode, where the
output state returns to the Power-On State (POS) until sufficient
VCC is supplied. ICC levels may not meet datasheet limits when
VCC < VCC(min).
Assembly Description
This sensor is integrally molded into a plastic body that has been
optimized for size, ease of assembly, and manufacturability. High
operating temperature materials are used in all aspects of con-
struction. Refer to the Allegro website, www.allegromicro.com,
for more specific applications notes on finished sensor processing
of this module.
Diagnostics
The regulated current output is configured for two-wire applica-
tions, requiring one less wire for operation than do switches with
the traditional open-collector output. Additionally, the system
designer inherently gains diagnostics because there is always
output current flowing, which should be in either of two nar-
row ranges, shown in figure 8 as ICC(HIGH) and ICC(LOW). Any
current level not within these ranges indicates a fault condition.
If ICC > ICC(HIGH)(max), then a short condition exists, and if ICC
< ICC(LOW)(min), then an open condition exists. Any value of ICC
between the allowed ranges for ICC(HIGH) and ICC(LOW) indicates
a general fault condition.
V+
Test pin floating
1
VCC
ATS682
GND
4
ECU
100 7
RSENSE
CLOAD
CBYP
0.01 μF
+mA
ICC(HIGH)(max)
ICC(HIGH)(min)
ICC(LOW)(max)
ICC(LOW)(min)
0
Short
Fault
Open
Range for Valid ICC(HIGH)
Range for Valid ICC(LOW)
Figure 7. Typical application circuit
Figure 8. Diagnostic characteristics of supply current values
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
11
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| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ATS682LSH.PDF ] | |
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