Effect Sensor. A1354 Datasheet

A1354 Sensor. Datasheet pdf. Equivalent

A1354 Datasheet
Recommendation A1354 Datasheet
Part A1354
Description High Precision 2-Wire Linear Hall Effect Sensor
Feature A1354; A1354 High Precision 2-Wire Linear Hall Effect Sensor with Pulse Width Modulated Output www.datashee.
Manufacture Allegro Micro Systems
Datasheet
Download A1354 Datasheet





Allegro Micro Systems A1354
A1354
High Precision 2-Wire Linear Hall Effect Sensor
with Pulse Width Modulated Output
Features and Benefits
www.dataDsehseiegt4nue.dcofmor automotive, battery-powered applications
Customer programmable quiescent duty cycle, sensitivity,
and PWM carrier frequency, through VCC pin
Simultaneous programming of duty cycle, sensitivity, and
PWM carrier frequency, for system optimization
Factory programmed sensitivity temperature coefficient
and quiescent duty cycle drift
Selectable unidirectional or bidirectional quiescent
duty cycles
Pulse width modulated (PWM) output provides increased
noise immunity compared to analog output
Temperature-stable quiescent duty cycle output and
sensitivity
Continued on the next page…
Package: 4-pin SIP (suffix KT)
1 mm case thickness
Description
The A1354 device is a high precision, programmable 2-wire
Hall effect linear sensor with a pulse width modulated (PWM)
output. The duty cycle (D) of the PWM output signal is
proportional to the applied magnetic field. The A1354 device
converts an analog signal from its internal Hall sensor element
to a digitally encoded PWM output signal. The coupled noise
immunity of the digitally encoded PWM output is far superior
to the noise immunity of an analog output signal.
The BiCMOS, monolithic circuit inside of theA1354 integrates
a Hall element, precision temperature-compensating circuitry
to reduce the intrinsic sensitivity and offset drift of the Hall
element, a small-signal high-gain amplifier, proprietary
dynamic offset cancellation circuits, and PWM conversion
circuitry. The dynamic offset cancellation circuits reduce
the residual offset voltage of the Hall element. Hall element
offset is normally caused by device overmolding, temperature
dependencies, and thermal stress. The high frequency offset
cancellation (chopping) clock allows a greater sampling rate,
which increases the accuracy of the output signal and results
in faster signal processing capability.
The A1354 sensor is provided in a lead (Pb) free 4-pin single
inline package (KT suffix), with 100% matte tin leadframe
plating.
Not to scale
VCC
VCC
Functional Block Diagram
Regulator
Programming
Logic
PWM Carrier
Generation
and Trimming
1
2 Switched
2 Capacitor
Control
1
Chopper
Switches
Amp
Temperature
Compensation
Programming
Interface
Sensitivity
and Sensitivity
TC Trim
Signal
Recovery
% Duty
Cycle
% Duty Cycle
Temperature
Coefficient
Voltage
Controlled
Current
Source
GND
RSens
A1354-DS



Allegro Micro Systems A1354
A1354
High Precision 2-Wire Linear Hall Effect Sensor
with Pulse Width Modulated Output
wwFwe.adatutarsehseeat4nud.coBmenefits (continued)
Output duty cycle clamps provide short circuit diagnostic
capabilities
Optional 50% duty cycle calibration test mode at device power-up
Wide ambient temperature range: –40°C to 125°C
Resistant to mechanical stress
Extremely thin package: 1 mm case thickness
Selection Guide
Part Number
Packing*
A1354KKTTN-T
4000 pieces per 13-in. reel
*Contact Allegro® for additional packing options
Absolute Maximum Ratings
Characteristic
Forward Supply Voltage
Reverse Supply Voltage
Forward Supply Current
Reverse Supply Current
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
Symbol
VCC
VRCC
ICC
IRCC
TA
TJ(max)
Tstg
Range K
Notes
Rating
28
–16
50
–50
–40 to 125
165
–65 to 165
Unit
V
V
mA
mA
ºC
ºC
ºC
Pin-out Diagram
Branded
Face
1 2 34
Terminal List
Number
Name
1 VCC
2 NC
3 NC
4 GND
Function
Input power supply; use bypass capacitor to connect to ground
Not connected
Not connected
Ground
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2



Allegro Micro Systems A1354
A1354
High Precision 2-Wire Linear Hall Effect Sensor
with Pulse Width Modulated Output
wwOwP.dEatRasAhTeeINt4Gu.cComHARACTERISTICS (A) Valid with CBYPASS = 0.01 μF, over full operating temperature range, TA, and VCC, unless otherwise
noted
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max.
Unit1
ELECTRICAL CHARACTERISTICS
Supply Voltage2
Supply Current
Supply Current Ratio3
Power-On Time4
Supply Zener Clamp Voltage
Internal Bandwidth
VCC
ICC(LOW)
ICC(HIGH)
ICC(rat)
tPO
VZ
BWi
TA = 25°C, CL (of test probe)= 10 pF,
Sens = 0.1%/G, fPWM = fPWM(slow)
TA = 25°C, CL (of test probe)= 10 pF,
Sens = 0.1%/G, fPWM = fPWM(fast)
TA = 25°C, ICC = ICC(max) + 3 mA
Small signal –3 dB, 100 G(P-P) magnetic input
signal
4.5 12
–6
13 –
2–
– 100
– 25
28.5 32
– 200
16
9
19
V
mA
mA
ms
ms
V
Hz
Chopping Frequency5
OUTPUT CHARACTERISTICS
fC TA = 25°C
– 200 –
kHz
Response Time4
Clamp Duty Cycles6
Duty Cycle Jitter4,7
tRESPONSE
DCLP(HIGH)
DCLP(LOW)
JitterPWM
TA = 25°C, Impulse magnetic field of 300 G,
Sens = 0.1%/G, fPWM = fPWM(slow)
TA = 25°C, Impulse magnetic field of 300 G,
Sens = 0.1%/G, fPWM = fPWM(fast)
TA = 25°C
TA = 25°C
TA = –10°C to 85°C, Sens = 0.12%/G, Measured
over 1000 Output PWM clock periods
90
5
100
25
92.5
7.5
±0.05
95
10
ms
ms
%
%
%
Duty Cycle Resolution
ResPWM
TA = –10°C to 85°C, Sens = 0.12%/G, Measured
over 1000 Output PWM clock periods
±0.42
G
11 G (gauss) = 0.1 mT (millitesla).
2Supply voltage, VCC, is defined as the voltage drop between pin 1 and pin 4 of the device. It does not include the voltage drop across RSENS.
3ICC ratio is defined as ICC(HIGH) / ICC(LOW) for a given PWM cycle.
4See Characteristic Definitions section.
5fC varies up to approximately ±20% over the full operating ambient temperature range, TA, and process.
6Clamp duty cycles are tested with the maximum sensitivity code addressed and an applied magnetic field that is at least 25% greater than
the dynamic range.
7Jitter is dependent on the sensitivity of the device. Values are based on characterization only and are not guaranteed via production testing.
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3





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