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A1229LLTTK-T

P1-P3P4-P6P7-P9P10-P12P13-P14
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 magnetically optimized
packages for most applications. Suffix LH is a 3-pin SOT23W
surface-mount package; suffix UA is a 3-pin ultramini SIP for
through-hole mounting. The packages are lead (Pb) free with
100% matte-tin leadframe plating.
A1225-DS, Rev. 4
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
Hall-Effect Latch for High Temperature Operation
Functional Block Diagram
A1225, A1227, and A1229
Hall Chopping Logic
AMP
Anti-aliasing
LP-Filter
Tuned Filter
Clock / Logic
Regulator
To All SubcircuitsVCC
VOUT
GND
October 31, 2016
PACKAGES:
Not to scale
3-pin SOT23W
(suffix LH)
3-pin SIP,
matrix HD style
(suffix UA)
3-pin SIP,
chopper style
(suffix UA)
NOT FOR
NEW DESIGN
Hall-Effect Latch for High Temperature Operation
A1225, A1227
and A1229
2
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Pinout Diagrams
ABSOLUTE MAXIMUM RATINGS
Characteristic Symbol Notes Rating Unit
Forward Supply Voltage V
CC
30 V
Reverse Supply Voltage V
RCC
–30 V
Output Off Voltage V
OUT
30 V
Reverse Output Voltage V
ROUT
–0.5 V
Continuous Output Current I
OUT(SINK)
25 mA
Operating Ambient Temperature T
A
Range L –40 to 150 ºC
Maximum Junction Temperature T
J
(max) 165 ºC
Storage Temperature T
stg
–65 to 170 ºC
Terminal List Table
Number
Name Function
LH UA
1 1 VCC Input power supply
2 3 VOUT Output signal
3 2 GND Ground
2 31
Package UA
SELECTION GUIDE
Part Number Packing
[1]
Package
Ambient
Temperature, T
A
B
RP
(min)
(G)
B
OP
(max)
(G)
A1225LLHLT-T 7-in. reel, 3000 pieces/reel 3-pin SOT-23W surface mount
–40°C to 150°C –300 300A1225LLHLX-T 13-in. reel, 10000 pieces/reel 3-pin SOT-23W surface mount
A1225LUA-T
[2]
Bulk, 500 pieces/bag 3-pin SIP through hole
A1227LLHLT-T 7-in. reel, 3000 pieces/reel 3-pin SOT-23W surface mount
–40°C to 150°C –175 175A1227LLHLX-T 13-in. reel, 10000 pieces/reel 3-pin SOT-23W surface mount
A1227LUA-T
[2]
Bulk, 500 pieces/bag 3-pin SIP through hole
A1229LLHLT-T 7-in. reel, 3000 pieces/reel 3-pin SOT-23W surface mount
–40°C to 150°C –200 200A1229LLHLX-T 13-in. reel, 10000 pieces/reel 3-pin SOT-23W surface mount
A1229LUA-T
[2]
Bulk, 500 pieces/bag 3-pin SIP through hole
1
Contact Allegro
™
for additional packaging options.
2
The chopper-style UA package is not for new design; the matrix HD style UA package is recommended for new designs.
RoHS
COMPLIANT
3
21
Package LH
Hall-Effect Latch for High Temperature Operation
A1225, A1227
and A1229
3
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
ELECTRICAL CHARACTERISTICS: Valid at T
A
= –40°C to 150°C, C
BYPASS
= 0.1 µF, V
CC
= 12 V, unless otherwise noted
Characteristics Symbol Test Conditions Min. Typ.
[1]
Max. Unit
[2]
ELECTRICAL CHARACTERISTICS
Supply Voltage V
CC
Operating; T
J
≤ 165°C 3.8 24 V
Supply Current I
CC
B < B
RP
(Output off) – – 6 mA
B > B
OP
(Output on) – – 6 mA
Supply Zener Voltage V
Z(sup)
I
CC
= 9 mA, T
A
= 25°C 28 – – V
Reverse Battery Current I
Z(sup)
V
RCC
= –28 V, T
A
= 25°C – – – 5 mA
Power-On Time
[3]
t
PO
– – 12 µs
Power-On State POS B < B
OP
– HIGH – –
Chopping Frequency f
chop
– 400 – kHz
OUTPUT STAGE CHARACTERISTICS
Output Saturation Voltage V
OUT(sat)
I
OUT
= 20 mA – 175 400 mV
Output Leakage Current I
OFF
V
OUT
= 24 V, B < B
RP
– < 1 10 µA
Output Rise Time
[3][4]
t
r
R
L
= 820 Ω, C
L
= 20 pF – 200 2000 ns
Output Fall Time
[3][4]
t
f
R
L
= 820 Ω, C
L
= 20 pF – 200 2000 ns
Output Zener Voltage V
Z(out)
I
OUT
= 3 mA, T
A
= 25°C 30 – – V
MAGNETIC CHARACTERISTICS
Operate Point B
OP
A1225
T
A
= 25°C 170 – 270 G
Over operating temperature range 140 – 300 G
A1227
T
A
= 25°C 50 – 150 G
Over operating temperature range 50 – 175 G
A1229
T
A
= 25°C 100 – 180 G
Over operating temperature range 80 – 200 G
Release Point B
RP
A1225
T
A
= 25°C –270 – –170 G
Over operating temperature range –300 – –140 G
A1227
T
A
= 25°C –150 – –50 G
Over operating temperature range –175 – –50 G
A1229
T
A
= 25°C –180 – –100 G
Over operating temperature range –200 – –80 G
Hysteresis (B
OP
– B
RP
) B
HYS
A1225
T
A
= 25°C 340 – 540 G
Over operating temperature range 280 – 600 G
A1227
T
A
= 25°C 100 300 G
Over operating temperature range 100 – 350 G
A1229
T
A
= 25°C 200 – 360 G
Over operating temperature range 160 – 400 G
1
Typical data are at T
A
= 25°C and V
CC
= 12 V, and are for design estimations only.
2
1 G (gauss) = 0.1 mT (millitesla).
3
Minimum and maximum specifications verified by bench characterization and not guaranteed by Allegro final test.
4
C
L
= oscilloscope probe capacitance.
P1-P3P4-P6P7-P9P10-P12P13-P14

A1229LLTTK-T

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Description:
MAGNETIC SWITCH LATCH SOT89-3
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