A1373EKBTI [ALLEGRO]
HIgh Precision, Output Pin Programmable Linear Hall Effect Sensors; 精度高，输出引脚可编程线性霍尔效应传感器
| 型号： | A1373EKBTI |
| 厂家： | 
ALLEGRO MICROSYSTEMS |
| 描述： | HIgh Precision, Output Pin Programmable Linear Hall Effect Sensors |
| 文件： | 总23页 (文件大小：435K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
A1373 and A1374
High Precision, Output Pin Programmable
Linear Hall Effect Sensors
The A1373 and A1374 high precision linear Hall effect sensors are sensitive, tem-
perature stable, linear devices with externally programmable features. This device
family incorporates a chopper-stabilized amplifier, voltage regulator, program-
ming logic, and an output amplifier on a single IC. The patented dynamic offset
cancellation used with a chopper-stabilization technique provides extremely low
offset and minimal temperature drift. A high frequency clock is used for chopping,
to ensure high frequency signal processing capability. The A1373 and A1374 are
ideal for use in automotive and industrial linear position-sensing applications that
require increased reliability and accuracy over conventional contacting-potentiom-
eter solutions. Key applications include: throttle position sensors, pedal position
sensors, and suspension height sensors.
Package KB, 3-pin SIP
The design and manufacturing flexibility of the A1373 and A1374 complement
the Allegro linear Hall effect family of devices by offering programmable gain,
quiescent offset voltage for unipolar or bipolar operation, temperature coef-
ficient, clamps, and polarity. The device can be set up in a magnetic circuit
and programmed with a train of serial pulses via the output pin. Once the right
combination of gain, quiescent output voltage, and temperature coefficient has
been selected, the codes can be locked for one-time programming. In this manner,
manufacturing tolerances can be reduced and the assembly process can be simpli-
fied.
1
2
3
1. VCC
These devices are available in the KB package, a 3-pin SIP (single inline pack-
age). The lead (Pb) free version has a 100% matte tin plated leadframe.
2. GND
3. VOUT (Programming)
Features and Benefits
ꢀOutput pin programming
ABSOLUTE MAXIMUM RATINGS
ꢀField-programmable for optimal application integration
Supply Voltage, VCC ..........................................16 V
Reverse-Supply Voltage, VRCC ........................–16 V
Output Voltage1, VOUT.......................................16 V
Reverse-Output Voltage, VROUT .....................–0.1 V
Output Current
Source, IOUTSOURCE ................................... 3 mA
Sink, IOUTSINK.......................................... 10 mA
Operating Temperature
Ambient, TA, Range E..................–40ºC to 85ºC
Ambient, TA, Range L................–40ºC to 150ºC
Maximum Junction, TJ(max)........................165ºC
Storage Temperature, TS ..................–65ºC to 170ºC
ꢀSelectable coarse and fine gain and quiescent output voltage
ꢀSelectable sensitivity temperature coefficient
ꢀSelectable output clamp voltage level, including no-clamp (rail-to-rail)
ꢀSelectable output polarity
ꢀUnipolar or bipolar operation
ꢀRatiometric sensitivity, clamps, and quiescent output voltage
ꢀChopper-stabilized Hall technique
ꢀWide operating temperature range
ꢀOn-chip regulator for over/under voltage protection
ꢀOn-chip regulator provides EMI robustness
ꢀWide lead-spacing with KB package
1When blowing fuses during device programming, a
voltage of 28 V may be applied to VOUT.
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1373-DS, Rev. 3
A1373 and A1374
High Precision, Output Pin Programmable, Linear Hall Effect Sensors
Product Selection Guide
Pb-
Ambient, TA
(ºC)
Part Number free
Packing*
A1373EKB
–
Yes
–
Bulk, 500 pcs./bag
A1373EKB–T
A1373EKBTI
–40 to 85
14.24-in. reel, 2000 pcs/reel
A1373EKBTI–T Yes
A1373LKB
–
Yes
–
Bulk, 500 pcs./bag
14.24-in. reel, 2000 pcs/reel
Bulk, 500 pcs./bag
A1373LKB–T
A1373LKBTI
–40 to 150
–40 to 85
–40 to 150
A1373LKBTI–T Yes
A1374EKB
–
Yes
–
A1374EKB–T
A1374EKBTI
14.24-in. reel, 2000 pcs/reel
Bulk, 500 pcs./bag
A1374EKBTI–T Yes
A1374LKB
–
Yes
–
A1374LKB–T
A1374LKBTI
14.24-in. reel, 2000 pcs/reel
A1374LKBTI–T Yes
*Contact Allegro for additional packing options
Functional Block Diagram
VCC
Pin 1
Voltage
Regulator
To all subcircuits
VOUT
Pin 3
Amp
Out
Hall drive circuit
Temperature
Coefficient
Gain
Offset
Trim Control
GND
Pin 2
Allegro MicroSystems, Inc.
2
115 Northeast Cutoff, Box 15036
A1373-DS, Rev. 3
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1373 and A1374
High Precision, Output Pin Programmable, Linear Hall Effect Sensors
CHARACTERISTIC PARAMETERS
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max
Units
ELECTRICAL CHARACTERISTICS over operating temperature range, VCC=5.0 V, unless otherwise noted
Operation within specification,
Tj < 165°C
Supply Voltage
VCC
4.5
5.0
5.5
V
Supply Current
ICC
IRCC
tPO
fC
–
–
–
–
8.2
–
10
16
300
–
mA
mA
μs
Reverse-Supply Current
Power-On Time1
VCC = –16 V, TA = 25°C
CLOAD = 10 nF, 90% full scale VOUT
–
Chopping Frequency
200
kHz
A1373
–
–
2.5
20
–
–
kHz
kHz
Internal Bandwidth
BW
Small signal -3 dB
A1374
OUTPUT CHARACTERISTICS over operating temperature range, VCC=5.0 V, unless otherwise noted
A1373
A1374
–
–
6
16
26
mV
mV
peak-to-peak, CLOAD > 1 nF,
2.5 mV/G
Noise2,3
VN
14
Output Capacitance Load
Output Resistive Load
CLOAD
RLOAD
VOUT pin to GND pin
–
4700
–
–
–
3
3
10
–
nF
Ω
A1373 Magnetic signal freq.=100 Hz
A1374 Magneticsignal freq.=1000Hz
–
(°)
(°)
Phase Shift
ΔΦ
–
–
IOUTSINK = 1.2 mA,
B(kG) > (VCC–VOUT(Q)) / Sens (mV/G)
VOUT(Sat)HIGH
4.65
4.7
–
V
Output Voltage
IOUTSOURCE = 1.2 mA,
B(kG) < VOUT(Q) / Sens (mV/G)
VOUT(Sat)LOW
ROUT
–
–
0.2
1.5
0.25
–
V
Output Resistance
Ω
MAGNETIC CHARACTERISTICS
Magnetic Slew Rate
SLR
V / ms / Sens
–
20
–
G/μs
PRE-PROGRAMMING TARGET (Prior to coarse and fine trim) over operating temperature range, VCC=5.0 V, unless
otherwise noted
Pre-Programming Quiescent
Output Voltage
VOUT(Q)PRE
SensPRE
TCPRE
B = 0 G, TA = 25°C
TA = 25°C
1.62
1.05
1.80
1.31
0.05
1.98
1.75
V
Pre-Programming Sensitivity
mV/G
%/°C
Pre-Programming Sensitivity
Temperature Coefficient
TA relative to 25°C
–0.016
0.104
INITIAL COARSE PROGRAMMING over operating temperature range, VCC=5.0 V, unless otherwise noted
VOUT(Q)INITLOW TA = 25°C
–
–
–
–
–
–
0.55
–-
–
–
–
–
–
–
V
V
Initial Coarse Quiescent Output
Voltage
VOUT(Q)INITMID Reference VOUT(Q)PRE
VOUT(Q)INITHIGH TA = 25°C
3.25
–
V
SensINITLOW
SensINITMID
SensINITHIGH
Reference SensPRE
TA = 25°C
mV/G
mV/G
mV/G
Initial Coarse Sensitivity
2.8
5.5
TA = 25°C
Continued on the next page...
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
3
A1373-DS, Rev. 3
A1373 and A1374
High Precision, Output Pin Programmable, Linear Hall Effect Sensors
CHARACTERISTIC PARAMETERS (continued)
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max
Units
QUIESCENT OUTPUT VOLTAGE PROGRAMMING over operating temperature range, VCC=5.0 V, unless otherwise noted
VOUT(Q)LOW
VOUT(Q)MID
VOUT(Q)HIGH
0.7
2.0
3.5
–
–
–
1.9
3.2
4.5
V
V
V
Quiescent Output Voltage Range
B = 0 G, TA = 25°C
TA = 25°C
Average Quiescent Output Voltage
Step Size4,5,6
StepVOUT(Q)
3.0
–
3.275
3.5
–
mV
mV
Quiescent Output Voltage
Programming Resolution
Fine programming value selection
accuracy
±0.5 ×
StepVOUT(Q)
ErrPROGVOUT(Q)
VOUT(Q) = VOUT(Q)LOW
VOUT(Q) = VOUT(Q)MID
VOUT(Q) = VOUT(Q)HIGH
–
–
–
–
–
–
±40
±40
±55
mV
mV
mV
Quiescent Output Voltage Drift
Over Operating Temperature
Range
ΔVOUT(Q)
Coarse (Range selection)
Fine (Value selection)
–
–
2
9
–
–
–
–
–
–
–
–
–
–
–
–
Bit
Bit
V
Quiescent Output Voltage
Programming Bits
–
A1373
4.350
4.300
0.4
4.565
4.650
0.6
VOUTCLP10HIGH
VOUTCLP10LOW
VOUTCLP20HIGH
VOUTCLP20LOW
tCLP
High-side output clamp
A1374
V
10% Output Clamp Option7
A1373
V
Low-side output clamp
A1374
0.3
0.6
V
A1373
3.925
3.900
0.9
4.125
4.200
1.1
V
High-side output clamp
A1374
V
20% Output Clamp Option7
Delay to Clamp
A1373
V
Low-side output clamp
A1374
0.8
1.1
V
A1373
A1374
–
2
μs
μs
–
100
SENSITIVITY PROGRAMMING over operating temperature range, VCC=5.0 V, unless otherwise noted
SensLOW
SensMID
1.75
3.5
7.0
6
–
–
2.8
5.7
11.25
14
mV/G
mV/G
mV/G
μV/G
μV/G
μV/G
Sensitivity Range8
TA = 25°C
SensHIGH
–
StepSENSLOW
StepSENSMID
StepSENSHIGH
9.5
18.7
37.0
Average Sensitivity Step Size4,5,6
TA = 25°C
12
28
22
56
Fine programming value selection
accuracy
Sensitivity Programming
Resolution
±0.5 ×
ErrPROGSENS
–
–
–
μV/G
StepSENS
Coarse (Range selection)
Fine (Value selection)
–
–
2
8
–
–
Bit
Bit
Sensitivity Programming Bits
POLARITY PROGRAMMING
–
Negative Sensitivity
–
1
–
Bit
Polarity Programming Bit
Continued on the next page...
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
4
A1373-DS, Rev. 3
A1373 and A1374
High Precision, Output Pin Programmable, Linear Hall Effect Sensors
CHARACTERISTIC PARAMETERS (continued)
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max
Units
SENSITIVITY TEMPERATURE COEFFICIENT PROGRAMMING over operating temperature range, VCC=5.0 V, unless
otherwise noted
Sensitivity T/C codes 0 to 11,
–
–
–
minimum (absolute) positive
temperature coefficient attainable
0.07
%/°C
%/°C
Sensitivity Temperature
Coefficient Range
TC
Sensitivity T/C codes 16 to 27,
minimum (absolute) negative
temperature coefficient attainable
–0.016
–
Average Sensitivity
Temperature Coefficient Step
Size4,5,6
StepTC
–
–
–
–
–
TA = 150°C
0.01
%/°C
Bit
Sensitivity Temperature
Coefficient Programming Bits
5
1
ONE-TIME PROGRAMMING
–
–
–
Bit
Device Programming Lock Bit
RATIOMETRY over operating temperature range, VCC=5.0 V, unless otherwise noted
RatVOUT(Q)
RatSENS
–
–
–
–
–
–
%
%
%
Quiescent Voltage Error
Sensitivity Error
Clamp Error
VCC at VOPERATING
VCC at VOPERATING
VCC at VOPERATING
±0.25
±1.0
±1.5
RatVOUTCLP
LINEARITY over operating temperature range, VCC=5.0 V, unless otherwise noted
–
–
–
–
%
%
Positive Linearity Error
Negative Linearity Error
Lin+
Lin–
VCC at VOPERATING
VCC at VOPERATING
±0.5
±0.5
SYMMETRY over operating temperature range, VCC=5.0 V, unless otherwise noted
Sym
–
–
%
%
Symmetry Error
ADDITIONAL CHARACTERISTICS
Sensitivity Drift9
VCC at VOPERATING – VCC
±0.35
–
–
ΔSens
±2
FAULT CONDITIONS over operating temperature range, VCC=5.0 V, unless otherwise noted
VOUT pin to VCC pin
–
–
–
–
18
4
mA
mA
IOUTSHT
Shorted Output Wire
VOUT pin to GND pin
1 tPO does not include tCLP, specified in the Quiescent Programming section of this table.
2 Peak to peak value exceeded: 0.3% (6σ).
3 For A1373, no digital noise is present at the output.
4 Step size is larger than required for the specified range, to take into account manufacturing spread.
5 Individual code step sizes can be greater than 2× larger than the step size at each significant bit rollover.
6 Average fine code step size in a given range = (Output value at highest fine code in the range – Output value at code 0 of the range) / Total quantity of
steps (codes) in the range.
7 Values indicated are valid if any additional magnetic field does not exceed B(kG)= ±2 (V)/Sens (mv/G), after VOUTCLP is reached.
8 Program the Sensitivity T/C register before programming Sensitivity Coarse and Sensitivity Fine, due to a worst case shift of ±3% in sensitivity at 25°C
at the maximum values for Sensitivity T/C: Positive T/C and Sensitivity T/C: Negative T/C. The Programming Guidelines section in this document lists a
complete recommended order for programming individual values.
9Drift due to temperature cycling is due to package effects on the Hall transducer. The stress is reduced when the package is baked. However, it will
recover over time after removal from the bake.
Allegro MicroSystems, Inc.
5
115 Northeast Cutoff, Box 15036
A1373-DS, Rev. 3
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1373 and A1374
High Precision, Output Pin Programmable, Linear Hall Effect Sensors
Typical Characteristics
Temperature Coefficient Code Profile
TA = 150°C, Magnetically Back-Biased
VOUT(Q) = VOUT(Q)PRE, Sens = 5 mV/G
3.4
3.2
3.0
2.8
2.6
2.4
2.2
2.0
Positive Programming Codes
Negative Programming Codes
0
5
10
15
20
25
30
Sensitivity TC Code
Code Application
Initial code
0
1 – 11 Positive TC codes, use to increase TC value
12 – 15 [Unused, same effect as 4 – 7, respectively]
16 – 27 Negative TC codes, use to decrease TC value
28 – 31 [Unused, same effect as 20 – 23, respectively]
Allegro MicroSystems, Inc.
6
115 Northeast Cutoff, Box 15036
A1373-DS, Rev. 3
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1373 and A1374
High Precision, Output Pin Programmable, Linear Hall Effect Sensors
Sensitivity Temperature Coefficient Range, TC
0.25
0.20
0.15
Typical maximum attainable
positive TC programming range
Extended Range Not Guaranteed
TCPRE(max)
0.10
A
TC(typ), for positive programming
0.05
TC Range Before Programming
Guaranteed Programmable Range
0
TC(typ), for negative programming
TCPRE(min)
–0.05
–0.10
–0.15
–0.20
–0.25
Extended Range Not Guaranteed
Typical maximum attainable
negative TC programming range
A
Units with a TC in the range TC(min) < TC < TCPRE(max)
before programming may not be programmable
to the maximum attainable negative TC programming value
Allegro MicroSystems, Inc.
7
115 Northeast Cutoff, Box 15036
A1373-DS, Rev. 3
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1373 and A1374
High Precision, Output Pin Programmable, Linear Hall Effect Sensors
Average Supply Current (Icc) vs Temperature
Vcc = 5V
10.0
9.5
9.0
8.5
8.0
7.5
7.0
6.5
6.0
5.5
5.0
-50
-25
0
25
50
75
100
125
150
Temperature (°C)
Average Ratiometry, Voq
Average Ratiometry, Sens
101.0
100.8
100.6
100.4
100.2
100.0
99.8
101.0
100.8
100.6
100.4
100.2
100.0
99.8
4.5 to 5.0 V
5.5 to 5.0 V
4.5 to 5.0 V
5.5 to 5.0 V
99.6
99.6
99.4
99.4
99.2
99.2
99.0
99.0
-50
-25
0
25
50
75
100
125
150
-50
-25
0
25
50
75
100
125
150
Temperature (°C)
Temperature (°C)
Average Linearity vs Temperature
Average Symmetry vs Temperature
101.0
100.8
100.6
100.4
100.2
100.0
99.8
101.0
100.8
100.6
100.4
100.2
100.0
99.8
Linearity +
Linearity -
99.6
99.6
99.4
99.4
99.2
99.2
99.0
99.0
-50
-25
0
25
50
75
100
125
150
-50
-25
0
25
50
75
100
125
150
Temperature (°C)
Temperature (°C)
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
8
A1373-DS, Rev. 3
A1373 and A1374
High Precision, Output Pin Programmable, Linear Hall Effect Sensors
Average Delta Sensitivity
Average Delta Sensitivity over TC Codes
(percent change relative to 25°C)
Initial Coarse Range
(percent change relative to 25°C)
8
6
25
20
15
10
5
Sensitivity Low
Sensitivity Mid
Sensitivity High
Sensitivity Low - TC Code 0
Sensitivity Low - TC Code 11
Sensitivity Low - TC Code 27
4
2
0
0
-2
-4
-6
-5
-10
-15
-50
-25
0
25
50
75
100
125
150
-50
-25
0
25
50
Temperature (°C)
75
100
125
150
Temperature (°C)
Average Delta Sensitivity
Average Delta Sensitivity
(percent per degree Celsius change relative to 25°C)
(percent per degree Celsius change relative to 25°C)
Initial Coarse Low
0.08
0.06
0.04
0.02
0
0.20
Sensitivity Low - TC Code 0
Sensitivity Low - TC Code 11
Sensitivity Low - TC Code 27
0.15
0.10
0.05
0
Sensitivity Low
Sensitivity Mid
Sensitivity High
-0.02
-0.04
-0.06
-0.08
-0.05
-0.10
-0.15
-0.20
-50
-25
0
25
50 75
Temperature (°C)
100
125
150
-50
-25
0
25
50 75
Temperature (°C)
100
125
150
Negative TC Contribution to Delta Sensitivity
Positive TC Contribution to Delta Sensitivity
10
15
TC Code 1
TC Code 2
TC Code 4
TC Code 8
TC Code 11
5
0
10
5
TC Code 16
TC Code 17
TC Code 18
TC Code 20
TC Code 24
TC Code 27
-5
-10
-15
-20
0
-5
-10
-50
-25
0
25
50
75
100
125 150
-50
-25
0
25
50
75
Temperature (°C)
100
125
150
Temperature (°C)
Allegro MicroSystems, Inc.
9
115 Northeast Cutoff, Box 15036
A1373-DS, Rev. 3
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1373 and A1374
High Precision, Output Pin Programmable, Linear Hall Effect Sensors
Average Quiescent Output Voltage
Average Delta Quiescent Output Voltage
Relative to 25°C, Initial Sensitivity
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
6
4
Vout(q)Low - Initial
Vout(q)Mid - Initial
Vout(q)High - Initial
2
0
-2
-4
-6
-8
-10
Vout(q)Low
Vout(q)Mid
Vout(q)High
-50
-25
0
25 50
Temperature (°C)
75
100
125
150
-50
-25
0
25
50
75
100
125
150
Temperature (°C)
Average Quiescent Output Voltage
Max Code (511)
Average Initial Quiescent Output Voltage vs Supply Voltage
TA = 25°C
6
5
4
3
2
1
0
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
Vout(q)Low - Initial
Vout(q)Mid - Initial
Vout(q)High - Initial
Vout(q)Low - Max Code
Vout(q)Mid - Max Code
Vout(q)High - Max Code
-50
-25
0
25
50
75
100
125
150
4
4.5
5
5.5
6
Temperature (°C)
Supply Voltage (V)
Average Quiescent Output Voltage over Sensitivity
1.85
1.83
1.81
1.79
1.77
Vout(q)Mid - SensLow
Vout(q)Mid - SensMid
Vout(q)Mid - SensHigh
1.75
-50
-25
0
25
50
75
100
125
150
Temperature (°C)
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
10
A1373-DS, Rev. 3
A1373 and A1374
High Precision, Output Pin Programmable, Linear Hall Effect Sensors
Average Saturation Voltage
Average Clamp Values
5
4
3
2
1
0
5
4
3
2
1
0
10% High Clamp
10% Low Clamp
20% High Clamp
20% Low Clamp
V
V
OUT(sat)+
OUT(sat)–
-50
-25
0
25
50
75
100
125
150
-50
-25
0
25
50
75
100
125
150
Temperature (°C)
Temperature (°C)
Allegro MicroSystems, Inc.
11
115 Northeast Cutoff, Box 15036
A1373-DS, Rev. 3
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1373 and A1374
High Precision, Output Pin Programmable, Linear Hall Effect Sensors
Chopper Stabilization Technique
pass through a low-pass filter, while the modulated dc offset is
suppressed.
Chopper stabilization is a unique approach used to minimize
Hall offset on the chip. The patented Allegro technique, namely
Dynamic Quadrature Offset Cancellation, removes key sources
of the output drift induced by thermal and mechanical stresses.
This offset reduction technique is based on a signal modulation-
demodulation process. The undesired offset signal is separated
from the magnetic field-induced signal in the frequency domain,
through modulation.
The chopper stabilization technique uses a 200 kHz high
frequency clock. For demodulation process, a sample and hold
technique is used, where the sampling is performed at twice the
chopper frequency (400 kHz). This high-frequency operation
allows a greater sampling rate, which results in higher accuracy
and faster signal-processing capability.
This approach desensitizes the chip to the effects of thermal and
mechanical stresses, and produces devices that have extremely
stable quiescent Hall output voltages and precise recoverabil-
ity after temperature cycling. This technique is made possible
through the use of a BiCMOS process, which allows the use of
low-offset, low-noise amplifiers in combination with high-den-
sity logic integration and sample-and-hold circuits.
The subsequent demodulation acts as a modulation process for
the offset, causing the magnetic field-induced signal to recover
its original spectrum at baseband, while the dc offset becomes
a high-frequency signal. The magnetic-sourced signal then can
Regulator
Clock/Logic
Low-Pass
Filter
Hall Element
Amp
Concept of Chopper Stabilization Technique
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A1373 and A1374
High Precision, Output Pin Programmable, Linear Hall Effect Sensors
Definitions of Terms
Linear: A type of Hall-Effect sensor that produces an analog output voltage proportional to the strength of a sensed magnetic field.
Ratiometric: A linear Hall-Effect sensor that, when not subjected to a significant magnetic field, has an output that is a ratio of its supply voltage.
A ratiometric performance of 100% indicates the output follows the supply with no percentage error.
Gauss: Standard unit of measuring magnetic flux density. 1 gauss is equal to 1 Maxwell per square centimeter or 10-4 tesla. (For reference, the
earth’s magnetic field is approximately 0.5 gauss.)
Blowing: Applying a pulse of sufficient voltage and duration to permanently set a bit, by blowing a fuse internal to the device. Once a bit (fuse)
has been blown, it cannot be reset. The terms trimming and programming can be used interchangeably with blowing in this context.
Programming modes: Testing the results is the only valid method to guarantee successful programming, and multiple modes are provided to
support this. The programming modes are described in the section Mode Selection State.
Code: The number used to identify the register and the bitfield to be programmed, expressed as the decimal equivalent of the binary value. The LSB
of a register is denoted as bit 0.
Typical Application Drawing
VREG
1
VCC
Sensor Output
A1373
A1374
3
VOUT
CBYPASS
0.1 µF
RLOAD
4.7 kΩ
CLOAD
1 nF
GND
2
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A1373 and A1374
High Precision, Output Pin Programmable, Linear Hall Effect Sensors
Characteristic Definitions
proportional to the supply voltage, VCC
.
Quiescent Output Voltage. In the quiescent state (no signifi-
cant magnetic field: B = 0), the output, VOUTQ, equals a ratio of
the supply voltage, VCC, throughout the entire operating ranges
of VCC and ambient temperature, TA. Due to internal compo-
nent tolerances and thermal considerations, however, there is
a tolerance on the quiescent output voltage, ΔVOUTQ, which is
a function of both ΔVCC and ΔTA. For purposes of specifica-
tion, the quiescent output voltage as a function of temperature,
The ratiometric change in the quiescent output voltage,
RATVOUT(Q) (%), is defined as:
VOUTQ(V
VOUTQ(5V)
)
CC
RATVOUT(Q)
(4)
(5)
=
× 100%
VCC
5 V
the ratiometric change in sensitivity is defined as:
ΔVOUTQ(ΔT ), is defined as:
Sens(V
Sens(5V)
)
CC
A
RATSens
=
× 100%
VCC
5 V
–
VOUTQ(Τ ) VOUTQ(25ºC)
Α
(1)
ΔVOUTQ(ΔΤ )
=
and the ratiometric change in clamp voltage is defined as:
Α
Sens(25ºC)
VCLP(V
VCLP(5V)
where Sens is in mV/G, and the result is the device equivalent
accuracy, in gauss (G), applicable over the entire operating tem-
perature range.
)
CC
(6)
RATVCLP
=
× 100%
VCC
5 V
Note that clamping effect is applicable only when clamping is
enabled by programming of the device.
Sensitivity. The presence of a south-polarity (+B) magnetic
field, perpendicular to the branded face of the device package,
increases the output voltage, VOUT, in proportion to the magnetic
field applied, from VOUTQ toward the VCC rail. Conversely, the
application of a north polarity (–B) magnetic field, in the same
orientation, proportionally decreases the output voltage from its
quiescent value. This proportionality is specified as the magnetic
sensitivity of the device and is defined as:
Linearity and Symmetry. The on-chip output stage is
designed to provide linear output at a supply voltage of 5 V.
Although the application of very high magnetic fields does not
damage these devices, it does force their output into a nonlinear
–
VOUT(+B) VOUTQ
Lin+
Lin–
=
=
× 100%
(7)
(8)
2 (VOUT(+B½) – VVOUTQ
)
VOUT(–B) – VOUT(+B)
(2)
Sens
=
–
VOUT(–B) VOUTQ
2B
× 100%
2(VOUT(–B½) – VOUTQ
)
The stability of the device magnetic sensitivity as a function of
ambient temperature, ΔSens(ΔT ) (%) is defined as:
A
region. Linearity in percent is measured and defined as:
Sens(Τ ) – Sens(25ºC)
–
VOUT(+B) VOUTQ
Α
(3)
ΔSens(ΔΤ )
× 100%
=
(9)
Sym
=
Α
× 100%
Sens(25ºC)
VOUTQ – VOUT(–B)
Ratiometric. The A1373 and A1374 feature ratiometric
output. This means that the quiescent voltage output, VOUTQ
magnetic sensitivity, Sens, and clamp voltage, VOUTCLP, are
and output symmetry as:
,
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A1373-DS, Rev. 3
A1373 and A1374
High Precision, Output Pin Programmable, Linear Hall Effect Sensors
Pulse Generation
Several parameters can be field-programmed. To do so, a coded
series of voltage pulses through the VOUT pin is used to set
bitfields in onboard registers. The effect on the device output can
be monitored, and the registers can be cleared and set repeat-
edly until the required output results are achieved. To make the
setting permanent, bitfield-level solid state fuses are blown, and
finally, a device-level fuse is blown, blocking any further coding.
fourth voltage level, VR, is a very low level, near zero volts, used
to reset the bitfields that have not yet been isolated by blown
fuses.
The high level, VPH, pulse is maintained either for short duration
(ΔtPH = 1 to <<35 μs), acting as a strobe to signal the transition
between states, or for long duration (ΔtPH ≥35 μs) and used for
fuse-blowing. The device generates an internal pulse beginning
at the leading (rising) edge of a VPH pulse. The duration of the
Although any programmable variable power supply can be used
to generate the pulsed waveforms, Allegro highly recommends
using the Allegro Sensor Evaluation Kit, available on the Allegro
Web site On-line Store. The manual for that kit is available for
download free of charge, and provides additional information on
programming these devices.
internal pulse is the duration of the external VPH pulse, ΔtPH
,
plus 15 μs. The added time is a buffer to compensate for volt-
age drop when the high current is sourced, ensuring that there
is sufficient power to blow the fuse completely. Before sending
another pulse, an additional guard band of 5 μs is recommended
to allow the signal to decay, for a total of at least 20 μs after the
end of any VPH pulse. ΔtPH is measured from the time when the
external signal voltage rises above 23.6 V to the time when it
falls below 19.4 V. The nominal level for VPH is 28 V.
There are four relative nominal voltage levels that must be taken
into account when programming. For purposes of explanation
in this document, the signal levels are referred to simply as high
programming voltage, VPH, midrange, VPM, and low, VPL. The
Blow Fuse
Change State
1 < Δt < 35 µs
Δt > 35 µs
PH
PH
V
PH
V
PM
External Pulses
on VOUT Pin
V
PL
Guard
Band
(20 µs)
V
R
Guard Band (6 µs)
Blowing fuse
≥ 50 µs
t
min
Logic 1
Logic 0
Internal Pulses
Bit setting pulses = 5 µs
State Change or Blow pulse = Δt +15 µs
PH
Note: Spurious bit-setting pulses are generated on first V > V after V , and at last V .
PL
PL
R
Programming Pulse Waveforms
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A1373 and A1374
High Precision, Output Pin Programmable, Linear Hall Effect Sensors
The midrange voltage level, VPM, is a neutral level, used to
separate both VPH and VPL pulses from each other. The nominal
level for VPM is 15 V.
the VPL pulse will immediately end, with undefined results. The
nominal level for VPH is 5 V.
The low level, VPL, pulse is used to indicate bitfield addresses
that are to be set. The device generates an internal pulse begin-
ning at the leading (falling) edge of a VPL pulse. The duration
of the internal pulse is 5 μs. Before allowing the voltage to
rise again, an additional guard band of 1 μs is recommended to
ensure that the pulse completes, for a total of at least 6 μs after
VPL must always be maintained high enough above VR (nomi-
nally 0 V) to maintain the settings provisionally latched into
registers. Note that, when the external voltage rises from VR
through the VPL range, a spurious internal pulse is generated,
making Code 0 not available in Mode Selection state. A spurious
internal pulse also is generated when the external voltage falls
through the VPL range at the end of a code sequence. For that
reason, it is mandatory to ensure that the voltage is dropped fully
to VR, before every Blow Fuse mode operation, to ensure that
the spurious pulse does not affect the next code sequence.
the start of any VPL pulse. The duration of the VPL pulse, ΔtPL
,
is measured from the time when the external signal voltage falls
into the range 0 to 7.5 V to the time when it rises above 10 V. If
the voltage rises above 10 V before the 5 μs period expires, then
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A1373 and A1374
High Precision, Output Pin Programmable, Linear Hall Effect Sensors
Programming State Machine
POWER UP
INITIAL STATE
VPH
V
PH
MODE SELECT
V
PL
VPL
TRY
1
V
PL
BLOW
2
VPL
LOCK
3
V
PH
VPH
VPH
REGISTER SELECT
SENS.
Fine
VPL
SENS.
Coarse
SENS.
TC
4
QVO
Coarse
0
QVO
Fine
1
VPL
POLAR
6
V
PL
V
PL
VPL
CLAMP
5
V
PL
V
PL
3
2
V
PH
V
PH
V
PH
VPH
VPH
VPH
VPH
BITFIELD SELECT
BITFIELD SELECT
[Write Mode]
[Optional:
Measure]
[Optional:
Measure]
[Optional:
Measure]
VPL
V
PL
0
V
PL
1
V
PL
2
2^N -1
V
PL
V
PH
V
PH
VPH
VPH
V
PH
No
Yes
BLOWING
MODE?
FUSE BLOWING
User generated transition
Internally generated transition
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A1373 and A1374
High Precision, Output Pin Programmable, Linear Hall Effect Sensors
Programming Protocol and State Machine Description
device (2 bits)
INITIAL STATE
• Sens. Fine. Register for setting the value within the range set in the
Sens. Coarse register (8 bits)
• [Sensitivity] TC Register. Register for setting the temperature coef-
ficient for the device (5 bits).
After system power-up, the programming logic is reset to a
known state. This is referred to as the Initial state. All the regis-
ters that have intact fuses are set to logic 0.
• Clamp [VOUTCLP] Bit. Register for setting the clamping voltage of
the output (2 bits)
While in the Initial state, any VPL pulses on the VOUT pin are
ignored.
• Polarity Bit. Register setting the polarity of the output (1 bit)
To select a register, increment through the register bitfields by
sending VPL pulses on the VOUT pin. Note that the program-
ming of registers should follow the order shown in item 7 in the
section Programming Guidelines, not the bitfield selection order
shown here. The bitfield selection order is:
To enter the Mode Selection state, send one VPH pulse on the
VOUT pin.
MODE SELECTION STATE
This state allows the selection of the programming mode:
• Try Value Mode. In this mode, the user provisionally downloads
settings to the device registers, without blowing the bits. The user
can increment through the codes of each parameter, and evaluate the
results of various code settings.
• Blow Fuse Mode. In this mode, after downloading the settings, the
user can blow the fuses in specific registers.
• Lock Device Mode. This mode is similar to Blow Fuse mode, except
that the fuse that is blown permanently prevents any further program-
ming of any bits in the device.
0 pulses – QVO Coarse register
1 pulse – QVO Fine register
2 pulses – Sens. Coarse register
3 pulses – Sense Fine register
4 pulses – TC Register register
5 pulses – Clamp Bit register
6 pulses – Polarity Bit register
This register wraps by default.
To select a mode, increment through the register bitfields by
sending VPL pulses on the VOUT pin, as follows:
To enter the Register Selection state, send one VPH pulse on the
VOUT pin.
0 pulses – No effect
1 pulse – Try Value mode
2 pulses – Blow Fuse mode
3 pulses – Lock Device mode
This register wraps by default. This means that sending addi-
tional VPL pulses traverses the register again.
BITFIELD SELECTION STATE (Write Mode)
This state allows the selection of the individual bitfields to be
programmed, in the register selected in the Register Selection
state.
In Try Value mode, the total value of the bitfields selected incre-
ments by 1 with each VPL pulse on the VOUT pin. The param-
eter being programmed changes with each additional pulse, so
measurements can be taken after each pulse to determine if the
desired result has been acquired.
Any VPH pulse sent before a VPL pulse has no effect.
To enter the Register Selection state, after sending a valid quan-
tity of VPL pulses, send one VPH pulse on the VOUT pin.
REGISTER SELECTION STATE
In Blow Fuses mode, each bitfield to be blown must be selected
individually.
This state allows the selection of the register containing the
bitfields to be programmed. Selecting the register corresponds to
selecting the parameter to be set. For bit codes, see the section
Programming Logic.
For bit codes and wrapping for these registers, see the section
Programming Logic.
To leave this state, send one VPH pulse on the VOUT pin. If the
current mode is Try Value, the bitfields remain set and the device
reverts to the Mode Selection state. If the current mode is Blow
Fuse, the selected bitfield fuse is blown, and the device reverts to
the Mode Selection state.
• QVO [VOUT(Q)] Coarse. Register for setting the range of the operat-
ing dc point (2 bits)
• QVO Fine. Register for setting the value within the range set in the
QVO Coarse register (9 bits)
• Sens. [Sensivity] Coarse. Register for setting the overall gain of the
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A1373 and A1374
High Precision, Output Pin Programmable, Linear Hall Effect Sensors
Programming Logic
Binary Bitfield Address
Decimal Equivalent Code
Description
QVO Coarse register
00
0
1
2
3
VOUT(Q) mid range
01
V
V
OUT(Q) low range
OUT(Q) high range
10
11
QVO Fine register
000000000
111111111
Sens. Coarse register
00
Register wraps to 00
0
Initial value in selected QVO Coarse range
511
Maximum value in selected QVO Coarse range
0
1
2
3
Sens low range
01
Sens mid range
Sens high range
Register wraps to 00
10
11
Sens. Fine register
00000000
11111111
0
Initial value in selected Sens. Coarse range
255
Maximum value in selected Sens. Coarse range
TC Register register (See also chart Sensitivity Temperature Coefficient Code Profile in Typical Characteristics section)
00000
0
initial TC
00001 through 01011
01100 through 01111
10000 through 11011
1 through 11
12 through 15
16 through 27
Positive TC programming range
Unused: equal to codes 4 to 7, respectively
Negative TC prgramming range; Value for 16 equals 1 step
less than the value for the Initial TC Value (00000)
11100 through 11111
28 through 31
Unused: equal to codes 20 to 23, respectively
Clamp Bit register
00
0
1
2
3
Rail-to-rail output swing
0.5 V and VCC– 0.5V rails
1 V and VCC – 1 V rails
Register wraps to 00
01
10
00
Polarity Bit register
0
0
1
Positive (VOUT increases when a positive (south) magnetic
field is applied to the device )
1
Negative (VOUT increases when a negative (north) magnetic
field is applied to the device )
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A1373 and A1374
High Precision, Output Pin Programmable, Linear Hall Effect Sensors
Programming Guidelines
• A bypass capacitor rated at 0.1μF must be mounted between
the VOUT pin and the GND pin during programming. The
power supply used for programming should be capable of deliv-
ering 28 V and 300 mA.
already blown, the end result will be 0011 (code 3).
• Before powering down the device after programming, observe
the recommended delay, to ensure that the last VPH pulse has
decayed before voltage drops to the VPL voltage. This will avoid
the generation of overlapping VPL and VPH pulses. At the end of
a Lock Device mode code sequence, the delay is not necessary.
• Before beginning any Blow Fuse mode or Lock Device mode
code sequence, the device MUST be reset by cycling VCC
power-off and power-on again. Cycling power resets the device
by setting all bitfields that have intact fuses to 0. Bitfields with
blown fuses are unaffected.
• Programming order is important in both Try Value mode and
in Blow Fuse mode. There will be a slight parametric shift in
sensitivity after programming the temperature coefficient, and a
slight quiescent voltage shift with polarity. Subsequent changes
to sensitivity can cause a shift in the quiescent output voltage.
In Try Value mode, to retain register settings from previous code
sequences, do not cycle power between sequences.
When a register is selected in Register Selection mode, when
the VPH pulse is sent to enter the Bitfield Selection mode, the
bitfields with intact fuses in that register are reset to 0.
The following order is recommended:
a.
b.
c.
d.
e.
g.
Polarity
TC Register
Sens Coarse
QVO Coarse
Sens Fine
• In Try Value mode, all bits in the register can be set in one
code sequence. For example, setting the binary value 0110 and
sending a VPH pulse sets code 6. However, because of the power
requirement, blowing fuses must be performed one bitfield at
a time. In order to program (blow fuses) for binary 0110, the
bitfields MUST be programmed (blown) in two different code
sequences:one setting the 0100 bit, and the other setting the 0010
bit (in either order). Power must be cycled before each of the
two sequences.
QVO Fine
The Clamp Bit register can be programmed at any point in the
order, as no parametric shift is observed due to clamps.
• The actual distribution of parametric programming ranges are
wider than the specified programming ranges, in order to take
in to account manufacturing spread. The maximum possible
attainable range can be used with the understanding that other
specified parameters might be out of datasheet specification in
the extended range. (For an example, see the chart Sensitivity
Temperature Coefficient Range, in the Typical Characteristics
section.)
• Although a bitfield cannot be reset once its fuse is blown,
additional bitfields can be blown at any time, until the device is
locked by setting the Lock bit. For example, if bit 1 (0010) has
been blown, it is possible to blow bit 0 (0001). Because bit 1 was
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A1373 and A1374
High Precision, Output Pin Programmable, Linear Hall Effect Sensors
Programming Example
13. Send one VPH pulse to enter the Register Selection state.
14. Send four VPL pulses to select the TC register.
This example demonstrates the programming of the devices by
setting the register for Sensitivity Temperature Coefficient to
00110.
15. Send one VPH pulse to enter Bitfield Selection state (Write
Mode). The TC register is reset to 00000.
1. Power-on the system. This will reset the unprogrammed bits
in all registers to 0. The device enters the Initial state.
16. Send four VPL pulses to set bit 2 (00100, decimal 4).
2. Send one VPH pulse to enter the Mode Selection state.
3. Send one VPL pulse to select Try Value mode.
4. Send one VPH pulse to enter the Register Selection state.
5. Send four VPL pulses to select the TC register.
17. Send one VPH pulse to exit Bitfield Selection state. The
bitfield fuse is blown, and the device returns to the Mode
Selection state.
One of the two bitfields is programmed. Now we program the
other bitfield.
6. Send one VPH pulse to enter Bitfield Selection state (Write
mode). The TC register is reset to 00000 (assuming all of
those bitfields have intact fuses).
18. Repeat steps 10 to 15 to select the TC register again. This
time, however, the register resets to 00100, because bit 2 has
been permanently set.
7. Send five VPL pulses to set bitfields 0 and 2 (00101).
19. Send two VPL pulses to set bit 1 (00010, decimal 2).
20. Send one VPH pulse to exit Bitfield Selection state. The
bitfield fuse is blown, and the device returns to the Mode
Selection state.
Now we can measure the device output to see if this is the
desired value. We may find that the value we programmed is not
correct. So we will proceed to change it, as follows:
8. Send one VPL pulse to increase the code to 6 (setting bitfields
1 and 2: 00110).
After repeating the above steps to program all parameters, we
can lock the device:
21. RESET the device by powering it off and on.
We measure the device and find that this is the correct TC we
require. We are finished with trying values, and now want to set
the value permanently. In the following steps, remember that
blowing fuses is done one bit at a time.
22. Send one VPH pulse to enter the Mode Selection state.
23. Send three VPL pulses to select Lock Device mode.
24. Send one VPH pulse to enter the Bitfield Selection state. (We
do not need to select a register for locking the device).
25. Send one VPL pulse to set the Lock bit to 1.
9. Send one VPH pulse to exit Bitfield Selection mode. (The
device returns to the Mode Selection state.)
26. Send one VPH pulse to exit Bitfield Selection state. The
bitfield fuse is blown, and the device returns to the Mode
Selection state.
10. RESET the device by powering it off and on.
11. Send one VPH pulse to enter the Mode Selection state.
12. Send two VPL pulses to select Blow Fuse mode.
27. Programming the device is complete. Optionally, test the
results, or power-off the device.
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A1373 and A1374
High Precision, Output Pin Programmable, Linear Hall Effect Sensors
Package KB, 3-Pin SIP
.208 5.28
.203 5.16
45°
BSC
C
.1025 2.60
NOM
.063 1.60
.059 1.50
.0520 1.32
NOM
D
3.51
3.38
.138
.133
45°
BSC
B
A
.033 0.84
REF
.085 2.16
MAX
.020 0.51
REF
.0173 0.44
.0138 0.35
.600 15.24
.560 14.22
1
2
3
.023 0.58
.018 0.46
.075 1.91
NOM
Dimensions in inches
Millimeters in brackets, for reference only
Dimensions exclusive of mold flash, gate burrs, or dambar protrusions
Exact case and lead configuration at supplier discretion within limits shown
A
B
Dambar removal protrusion (6X)
Ejector mark on opposite side
C
D
Active Area Depth .0165 [0.42] NOM
Hall element (not to scale)
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
22
A1373-DS, Rev. 3
A1373 and A1374
High Precision, Output Pin Programmable, Linear Hall Effect Sensors
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 manufactur-
ability 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 devices or systems without express written approval.
The information included herein is believed to be accurate and reliable.
However, Allegro MicroSystems, Inc. assumes no responsibility for its
use; nor for any infringement of patents or other rights of third parties
which may result from its use.
Copyright © 2005, Allegro MicroSystems, Inc.
Allegro MicroSystems, Inc.
23
115 Northeast Cutoff, Box 15036
A1373-DS, Rev. 3
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www.allegromicro.com
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