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A1225 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 A1225
기능 Hall Effect Latch for High Temperature Operation
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A1225 데이터시트, 핀배열, 회로
A1225, A1227, and A1229
Hall Effect Latch for High Temperature Operation
Features and Benefits
Symmetrical switchpoints
Superior temperature stability
Operation from unregulated supply
Open-drain 25 mA output
Reverse Battery protection
Activate with small, commercially available
permanent magnets
Solid-state reliability
Small size
Resistant to physical stress
Enhanced ESD structures result in 8 kV HBM ESD
performance without external protection components
Internal protection circuits enable 40 V load dump
compliance without external protection components
Packages:
3-pin SIP
(suffix UA)
Not to scale
3-pin SOT89
(suffix LT)
Description
These Hall-effect latches are extremely temperature-stable
and stress resistant sensor ICs especially suited for operation
over extended temperature ranges to 150°C. Superior high-
temperature performance is made possible through a novel
Schmitt trigger circuit that maintains operate and release
point symmetry by compensating for temperature changes
in the Hall element. Additionally, internal compensation
provides magnetic switchpoints that become more sensitive
with temperature, hence offsetting the usual degradation of
the magnetic field with temperature. The symmetry capability
makes these devices ideal for use in pulse-counting applications
where duty cycle is an important parameter. The three basic
devices (A1225, A1227, and A1229) are identical except for
magnetic switchpoints.
Each device includes on a single silicon chip a voltage regulator,
Hall-voltage generator, temperature compensation circuit,
signal amplifier, Schmitt trigger, and a buffered open-drain
output to sink up to 25 mA. The on-board regulator permits
operation with supply voltages of 3.8 to 24 V.
The first character of the part number suffix determines the
device operating temperature range. Suffix L is for –40°C to
150°C. Two package styles provide a magnetically optimized
package for most applications. Suffix LT is a miniature SOT89/
TO-243AAtransistor package for surface-mount applications,
suffix UAis a three-lead ultra-mini-SIP. Both packages are lead
(Pb) free with 100% matte tin leadframe plating.
Functional Block Diagram
VCC
Regulator
Clock / Logic
To All Subcircuits
VOUT
A1225-DS, Rev. 1
AMP
Anti-aliasing
LP-Filter
Tuned Filter
GND




A1225 pdf, 반도체, 판매, 대치품
A1225, A1227
and A1229
Hall Effect Latch for High Temperature Operation
THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information
Characteristic
Symbol
Test Conditions*
Package LT, 1-layer PCB with copper limited to solder pads
Package Thermal Resistance
RθJA Package LT, 2-layer PCB with 0.94 in2 copper each side
Package UA, 1-layer PCB with copper limited to solder pads
*Additional thermal information available on Allegro website.
Value
180
78
165
Units
ºC/W
ºC/W
ºC/W
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
20
Power Derating Curve
1-layer PCB, Package LT
(RθJA = 180 ºC/W)
1-layer PCB, Package UA
(RθJA = 165 ºC/W)
2-layer PCB, Package LT
(RθJA = 78 ºC/W)
40 60 80 100 120 140
TA (ºC)
Power Dissipation
1900
1800
1700
1600
1500
1400
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
20
(R1θ-Jl(aAR1yθ-=eJlaAr1yP=8eC0r1BPº6C,C5P/BWºaC, c)P/Wka(aRc)θg2JkAe-ala=LgyeTe7r8UPºCCAB/W, P) ackage LT
40 60 80 100 120
Temperature (°C)
140
160
160
VCC(max)
VCC(min)
180
180
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4

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A1225 전자부품, 판매, 대치품
A1225, A1227
and A1229
Hall Effect Latch for High Temperature Operation
A1227 Magnetic Characteristics
Operate Point versus Ambient Temperature
175
163
150
138
125
113
100
VCC (V)
3.8
12
24
88
75
63
50
-60 -40 -20 0 20 40 60 80 100 120 140 160
TA (°C)
Release Point versus Ambient Temperature
-50
-63
-75
-88
-100
-113
-125
-138
-150
-163
-175
-60 -40 -20 0 20 40 60 80 100 120 140 160
TA (°C)
VCC (V)
3.8
12
24
Switchpoint Hysteresis versus Ambient Temperature
350
325
300
275
250
225
200
175
VCC (V)
3.8
12
24
150
125
100
-60 -40 -20 0 20 40 60 80 100 120 140 160
TA (°C)
175
163
150
138
125
113
100
88
75
63
50
2
Operate Point versus Supply Voltage
TA (°C)
–40
25
150
6 10 14 18 22 26
VCC (V)
-50
-63
-75
-88
-100
-113
-125
-138
-150
-163
-175
2
Release Point versus Supply Voltage
TA (°C)
–40
25
150
6 10 14 18 22 26
VCC (V)
350
325
300
275
250
225
200
175
150
125
Switchpoint Hysteresis versus Supply Voltage
100 2
6 10 14 18 22
VCC (V)
TA (°C)
–40
25
150
26
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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