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A1367 Schematic ( PDF Datasheet ) - Allegro

Teilenummer A1367
Beschreibung Programmable Linear Hall-Effect Sensor IC
Hersteller Allegro
Logo Allegro Logo 




Gesamt 27 Seiten
A1367 Datasheet, Funktion
A1367
Low-Noise, High-Precision, Programmable Linear Hall-Effect Sensor IC
with Regulated Supply, Advanced Temperature Compensation,
and High-Bandwidth (240  kHz) Analog Output
FEATURES AND BENEFITS
• 240 kHz nominal bandwidth achieved via proprietary
packaging and chopper stabilization techniques
• On-board supply regulator with reverse-battery protection
• Proprietary segmented linear temperature compensation
(TC) technology provides a typical accuracy of 1% over
the full operating temperature range
• Customer-programmable, high-resolution offset and
sensitivity trim
• Factory-programmed sensitivity and quiescent
output voltage TC with extremely stable temperature
performance
• High-sensitivity Hall element for maximum accuracy
• Extremely low noise and high resolution achieved via
proprietary Hall element and low-noise amplifier circuits
Continued on the next page…
PACKAGE:
4-Pin SIP (suffix KT)
DESCRIPTION
The Allegro™ A1367 programmable linear Hall-effect
current sensor IC has been designed to achieve high accuracy
and resolution without compromising bandwidth. This goal
is achieved through new proprietary linearly interpolated
temperature compensation technology that is programmed
at the Allegro factory and provides sensitivity and offset that
are virtually flat across the full operating temperature range.
Temperature compensation is performed in the digital domain
with integrated EEPROM technology while maintaining a
240 kHz bandwidth analog signal path, making this device
ideal for HEVinverter, DC-to-DC converter, and electric power
steering (EPS) applications.
This ratiometric Hall-effect sensor IC provides a voltage output
that is proportional to the applied magnetic field. The customer
can configure the sensitivity and quiescent (zero field) output
voltage through programming on the VCC and output pins,
to optimize performance in the end application. The quiescent
output voltage is user-adjustable, around 50% (bidirectional
configuration) or 10% (unidirectional configuration) of the
supply voltage, VCC, and the output sensitivity is adjustable
within the range of 0.6 to 6.4 mV/G.
Continued on the next page…
Not to scale
VCC
(Programming)
CBYPASS
A1367-DS, Rev. 1
Regulator
Programming
Control
To all
subcircuits
Temperature
Sensor
Sensitivity Control
Charge Pump
Pulse Generator
Undervoltage
Detection
Broken
Ground
Detection
EEPROM and
Control Logic
Active Temp.
Compensation
Offset Control
Output
Clamps
Signal Recovery
Push/Pull
Output Driver
GND
Functional Block Diagram
VOUT
(Programming)
CL






A1367 Datasheet, Funktion
A1367
Low-Noise, High-Precision, Programmable Linear Hall-Effect Sensor IC
with Regulated Supply, Advanced Temperature Compensation,
and High-Bandwidth (240  kHz) Analog Output
OPERATING CHARACTERISTICS (continued): Valid through the full operating temperature range, TA, CBYPASS = 0.1 µF,
VCC = 5 V, unless otherwise specified
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Unit1
OUTPUT CHARACTERISTICS (continued)
DC Output Resistance
Output Load Resistance
Output Load Capacitance6
Output Slew Rate7
ROUT
RL(PULLUP)
RL(PULLDWN)
CL
SR
QUIESCENT VOLTAGE OUTPUT (VOUT(Q))2
Initial Unprogrammed Quiescent
Voltage Output2,8
VOUT(QBI)init
VOUT(QU)init
Quiescent Voltage Output
Programming Range2,4,9
VOUT(QBI)PR
VOUT(QU)PR
Quiescent Voltage Output
Programming Bits10
QVO
VOUT to VCC
VOUT to GND
VOUT to GND
Sens = 2 mV/G, CL = 1 nF
TA = 25°C
TA = 25°C
TA = 25°C
TA = 25°C
– 3 –Ω
4.7 –
4.7 –
– 1 10 nF
– 480 – V/ms
2.4 2.5 2.6 V
0.45 0.5 0.55 V
2.35 – 2.65 V
0.4 – 0.6 V
– 9 – bit
Average Quiescent Voltage Output
Programming Step Size2,11,12
StepVOUT(Q) TA = 25°C
0.95 1.15 1.4 mV
Quiescent Voltage Output
Programming Resolution2,13
SENSITIVITY (Sens)2
ErrPGVOUT(Q) TA = 25°C
±0.5 ×
StepVOUT(Q)
mV
Initial Unprogrammed Sensitivity8
Sensitivity Programming Range4,9
Coarse Sensitivity Programming Bits14
Sensinit
SensPR
SENS_COARSE
SENS_COARSE = 00, TA = 25°C
SENS_COARSE = 01, TA = 25°C
SENS_COARSE = 10, TA = 25°C
SENS_COARSE = 00, TA = 25°C
SENS_COARSE = 01, TA = 25°C
SENS_COARSE = 10, TA = 25°C
– 1 – mV/G
– 2.2 – mV/G
– 4.7 – mV/G
0.6 – 1.3 mV/G
1.3 – 2.9 mV/G
2.9 – 6.4 mV/G
– 2 – bit
Fine Sensitivity Programming Bits10
SENS_FINE
– 9 – bit
Average Fine Sensitivity and
Temperature Compensation
Programming Step Size2,14,15
StepSENS
SENS_COARSE = 00, TA = 25°C
SENS_COARSE = 01, TA = 25°C
SENS_COARSE = 10, TA = 25°C
Sensitivity Programming Resolution2,13 ErrPGSENS TA = 25°C
FACTORY-PROGRAMMED SENSITIVITY TEMPERATURE COEFFICIENT
2.4 3.2 4.1
5 6.6 8.5
11 14.2 18
±0.5 ×
StepSENS
µV/G
µV/G
µV/G
µV/G
Sensitivity Temperature Coefficient2
TCSENS
TA = 150°C, TA= –40°C, calculated relative to
25°C
0
– %/°C
Sensitivity Drift Through Temperature
Range2,9,15
Average Sensitivity Temperature
Compensation Step Size
ΔSensTC
TA = 25°C to 150°C
TA = –40°C to 25°C
StepSENSTC TA = –40°C to 150°C
–2
–3.5
2 × StepSENS
2
3.5
%
%
µV/G
Continued on the next page…
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
6

6 Page









A1367 pdf, datenblatt
A1367
Low-Noise, High-Precision, Programmable Linear Hall-Effect Sensor IC
with Regulated Supply, Advanced Temperature Compensation,
and High-Bandwidth (240  kHz) Analog Output
CHARACTERISTIC DEFINITIONS (continued)
Delay to Clamp (tCLP )
A large magnetic input step may cause the clamp to overshoot
its steady-state value. The Delay to Clamp (tCLP ) is defined as:
the time it takes for the output voltage to settle within ±1% of its
steady-state value, after initially passing through its steady-state
voltage, as shown in Figure 4.
Quiescent Voltage Output (VOUT(Q))
In the quiescent state (no significant magnetic field: B = 0 G),
the output (VOUT(Q) ) has a constant ratio to the supply voltage
(VCC ) throughout the entire operating ranges of VCC and ambient
temperature (TA).
Initial Unprogrammed Quiescent Voltage
Output ( VOUT(Q)init  )
Before any programming, the Quiescent Voltage Output
(VOUT(Q)) has a nominal value of VCC / 2, as shown in Figure 5.
Quiescent Voltage Output Programming
Range ( VOUT(Q)PR )
The Quiescent Voltage Output (VOUT(Q) ) can be programmed
within the Quiescent Voltage Output Range limits: VOUT(Q)PR(min)
and VOUT(Q)PR(max). Exceeding the specified Quiescent Voltage
Output Range will cause Quiescent Voltage Output Drift Through
Temperature Range (ΔVOUT(Q)TC) to deteriorate beyond the
specified values, as shown in Figure 5.
V
VCLP(HIGH)
Magnetic Input
tCLP
t1 t2
VOUT
Average Quiescent Voltage Output Program-
ming Step Size (StepVOUT(Q))
The Average Quiescent Voltage Output Progamming Step Size
(StepVOUT(Q) ) is determined using the following calculation:
StepVOUT(Q)
=
VOUT(Q)maxcode VOUT(Q)mincode
2n – 1
,
(1)
where n is the number of available programming bits in the trim
range, 9 bits, VOUT(Q)maxcode is at decimal code 255, and
VOUT(Q)mincode is at decimal code 256.
Quiescent Voltage Output Programming Res-
olution (ErrPGVOUT(Q) )
The programming resolution for any device is half of its pro-
gramming step size. Therefore, the typical programming resolu-
tion will be:
ErrPGVOUT(Q)(typ) = 0.5 × StepVOUT(Q)(typ)
(2)
Quiescent Voltage Output Temperature Coef-
ficient (TCQVO)
Device VOUT(Q) changes as temperature changes, with respect to
its programmed Quiescent Voltage Output Temperature Coef-
ficient, TCQVO . TCQVO is programmed at 150°C and calculated
relative to the nominal VOUT(Q) programming temperature of
25°C. TCQVO (mV/°C) is defined as:
TCQVO = [VOUT(Q)T2 – VOUT(Q)T1][1/(T2 – T1)] (3)
where T1 is the nominal VOUT(Q) programming temperature of
t1=
time at which output voltage
reaches steady-state clamp
initially
voltage
t2=
time at which output voltage settles to
steady-state clamp voltage ±1% of the
clamp voltage dynamic range, where
clamp voltage dynamic range =
VCLP(HIGH)(min) – VCLP(LOW)(max)
Note: Times apply to both high clamp
(shown) and low clamp.
0
Figure 4: Delay to Clamp definition
t
VOUT(Q)PR(min)
value
VOUT(Q)
VOUT(Q)PR(max)
value
Programming range
(specified limits)
Distribution of values
resulting from minimum
programming code
(QVO programming bits
set to decimal code 256)
Typical initial value before
customer programming
VOUT(Q)init
(QVO programming
bits set to code 0)
Distribution of values
resulting from maximum
programming code
(QVO programming bits
set to decimal code 255)
Figure 5: Quiescent Voltage Output Range definition
Continued on the next page…
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
12

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