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A1386 Schematic ( PDF Datasheet ) - Allegro

Teilenummer A1386
Beschreibung 5V Field-Programmable Linear Hall Effect Sensor IC
Hersteller Allegro
Logo Allegro Logo 




Gesamt 19 Seiten
A1386 Datasheet, Funktion
A1386
5 V Field-Programmable Linear Hall Effect Sensor IC
with 3 V Supply Functionality, Analog Output, and Miniature Package Options
Features and Benefits
• Low power consumption using 3 V supply
• Factory programmed sensitivity temperature coefficient
(0.13%/°C nominal)
• Programmability at end-of-line
• Ratiometric sensitivity, quiescent voltage output, and
clamps for interfacing with application DAC
• Temperature-stable quiescent voltage output and sensitivity
• Precise recoverability after temperature cycling
• Output voltage clamps provide short circuit diagnostic
capabilities
• Wide ambient temperature range: –40°C to 150°C
• Resistant to mechanical stress
• Miniature package options
Packages
3-pin ultramini SIP
1.5 mm × 4 mm × 3 mm
(suffix UA)
Description
The Allegro® A1386 programmable, linear, Hall effect sensor
IC is designed for low power, high accuracy, and small package
size applications. The accuracy of this device is enhanced via
programmability on the output pin for end-of-line optimization
without the added complexity and cost of a fully programmable
device.
The A1386 has two operating modes, normal and low power.
In normal operation mode the A1386 operates much like its
predecessors, theA1381,A1382,A1383, andA1384, as a highly
accurate, user-programmable linear sensor IC with a ratiometric
output. In low power mode, the device actually disengages some
internal components in order to reduce power consumption.
Although the accuracy of the device is substantially reduced
during low power operation, it remains effective as a detector
of magnetic regions (such as north and south poles on a rotating
ring magnet). This unique feature allows the device to be used
in systems that are put to sleep, during which time there may
be only 3 V available, or in applications that have start-up
conditions where the available supply voltage may drop below
4.5 V for a period of time.
This ratiometric Hall effect device provides a voltage output
that is proportional to the applied magnetic field over the entire
Approximate scale
Continued on the next page…
Functional Block Diagram
V+
VCC
Chip Reference
Currents
To all subcircuits
CBYPASS
A1386-DS, Rev. 3
Amp
Out VOUT
GND
Hall Drive Circuit
Gain
Gain Temperature
Coefficient
Offset
Trim Control






A1386 Datasheet, Funktion
A1386
5 V Field-Programmable Linear Hall Effect Sensor IC with 3 V Supply
Functionality Analog Output, and Miniature Package Options
THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information
Characteristic
Package Thermal Resistance
Symbol
RθJA
Test Conditions*
Package LH, 1-layer PCB with copper limited to solder pads
Package LH, 2-layer PCB with 0.463 in.2 of copper area each side
connected by thermal vias
Package UA, 1-layer PCB with copper limited to solder pads
*Additional thermal information available on Allegro website.
Value Units
228 ºC/W
110 ºC/W
165 ºC/W
Power Derating Curve
6
5
1-layer PCB, Package LH
4 (RQJA = 228 ºC/W)
1-layer PCB, Package UA
(RQJA = 165 ºC/W)
3 2-layer PCB, Package LH
(RQJA = 110 ºC/W)
2
VCC(max)
VCC(min)
1
0
20 40 60 80 100 120 140 160 180
Temperature (ºC)
Power Dissipation versus Ambient Temperature
1900
1800
1700
1600
1500
1400
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
20
(R1Q-JlaAy=e(Rr12QP6J-AlC5ay=BºeC,1r P1/PW0aCc)ºBCk,a/PWga)eckUaAge LH
(1R-QlJaAye=r2P2C8BºC, P/Wac)kage LH
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
6

6 Page









A1386 pdf, datenblatt
A1386
5 V Field-Programmable Linear Hall Effect Sensor IC with 3 V Supply
Functionality Analog Output, and Miniature Package Options
Programming Procedures
Parameter Selection
Each programmable parameter can be accessed through a specific
register. To select a register, a sequence of voltage pulses con-
sisting of a VPH pulse, a series of VPM pulses, and a VPH pulse
(with no VCC supply interruptions) must be applied serially to
the VOUT pin. The number of VPM pulses is called the key, and
uniquely identifies each register. The pulse train used for selec-
tion of the first register, key 1, is shown in figure 4.
The A1386 has two registers that select among the three program-
mable parameters:
• Register 1:
Sensitivity, Sens
• Register 2:
Quiescent voltage output, VOUT(Q)
Overall device locking, LOCK
Bit Field Addressing
After a programmable parameter has been selected, a VPH pulse
transitions the programming logic into the bit field address-
ing state. Applying a series of VPM pulses to the VOUT pin of
the device, as shown in figure 5, increments the bit field of the
selected parameter.
When addressing the bit field, the number of VPM pulses is rep-
resented by a decimal number called a code. Addressing activates
the corresponding fuse locations in the given bit field by incre-
menting the binary value of an internal DAC. The value of the bit
field (and code) increments by one with the falling edge of each
VPM pulse, up to the maximum possible code (see the Program-
ming Logic table). As the value of the bit field code increases, the
value of the programmable parameter changes.
Measurements can be taken after each pulse to determine if the
desired result for the programmable parameter has been reached.
Cycling the supply voltage resets all the locations in the bit field
that have unblown fuses to their initial states.
Fuse Blowing
After the required code is found for a given parameter, its value
can be set permanently by blowing individual fuses in the appro-
priate register bit field. Blowing is accomplished by applying
a VPH pulse, called a blow pulse, of sufficient duration at the
VP(HIGH) level to permanently set an addressed bit by blowing a
fuse internal to the device. Due to power requirements, the fuse
for each bit in the bit field must be blown individually. To accom-
plish this, the code representing the desired parameter value
V+
VP(HIGH)
VP(MID)
VP(LOW)
0
tLOW
tACTIVE
V+
VP(HIGH)
VP(MID)
VP(LOW)
0
Figure 4. Parameter selection pulse train. This shows the sequence for sel-
ecting the register corresponding to key 1, indicated by a single VPM pulse.
Figure 5. Bit field addressing pulse train. Addressing the bit field by
incrementing the code causes the programmable parameter value to
change. The number of bits available for a given programming code, n,
varies among parameters; for example, the bit field for VOUT(Q) has 6 bits
available, which allows 63 separate codes to be used.
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
12

12 Page





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