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PDF A1232 Data sheet ( Hoja de datos )
| Número de pieza | A1232 | |
| Descripción | Hall-Effect Speed and Direction Sensor | |
| Fabricantes | Allegro | |
| Logotipo |  |
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A1232
Ultra-Sensitive, Hall-Effect Speed and Direction Sensor with TPOS
FEATURES AND BENEFITS
• AEC Q100 automotive qualified
• Senses speed and direction of ring magnets
□□Two matched bipolar Hall-effect switches on a single
substrate
□□True Power-On State (TPOS): Recognizes hysteresis
region at power-on
• Superior temperature stability
• Internal regulator for 3.3 to 24 V operation
• Symmetrical, high-sensitivity switchpoints
• Automotive grade
□□Solid-state reliability
□□Integrated ESD diodes
□□Robust structures for EMC protection
□□Short-circuit protected outputs
□□Reverse battery protection
□□–40°C to +150°C operating range
Package: 8-pin TSSOP (suffix LE)
Not to scale
DESCRIPTION
The A1232 is a highly sensitive, temperature-stable magnetic
sensing device ideal for use in ring-magnet-based speed
and direction systems in harsh automotive and industrial
environments. It contains two bipolar, Hall-effect switches
precisely arranged 1.63 mm apart. The switch outputs are thus
in quadrature when interfaced with the proper ring magnet
design. Internal logic processes the resulting digital signals to
derive speed and direction information that is presented at the
device’s outputs, OUTPUT A and OUTPUT B.
The A1232 is designed for demanding, high-performance
motor commutation applications. The Hall elements are
photolithographically aligned to better than 1 μm. Accurately
locating the two Hall elements eliminates a major manufacturing
hurdle encountered in fine-pitch applications. The A1232 also
has true power-on state (TPOS), the ability to detect when
it is in the hysteresis band, beyond BOP , or below BRP at
power-on. This provides reduced angle accuracy error due to
missed start-up edges.
Post-assembly factory programming at Allegro provides
sensitive, symmetrical switchpoints for both switches.
Extremely low-drift amplifiers maintain this symmetry. The
Allegro® patented, high-frequency chopper stabilization
technique cancels offsets in each channel and allows for
increased signal-to-noise ratio at the input of the internal
comparators. This leads to stable operation across the
Continued on next page...
VCC
Programmable
Trim
4 Bit
LDO Regulator
GND
Hall
Element
E1
Channel A
Dynamic Offset
Cancellation
Hall
Amp.
Low-
Pass
Filter
Low Noise Signal
Recovery
2 Bit
Output Drive and
High Resolution
Speed Logic
OUTPUT A
(Speed)
Hall
Element
E2
Channel B
Dynamic Offset
Cancellation
Hall
Amp.
Low-
Pass
Filter
Low Noise Signal
Recovery
2 Bit
A1232-DS, Rev. 1
Functional Block Diagram
Output Drive and
Direction Logic
OUTPUT B
(Direction)
1 page  
A1232
Ultra-Sensitive, Hall-Effect Speed
and Direction Sensor with TPOS
ELECTRICAL CHARACTERISTICS: valid over full operating temperature range unless otherwise noted; typical
data applies to VCC = 12 V and TA = 25°C; see typical application circuits
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Electrical Characteristics2
Supply Voltage3
VCC Operating: TA ≤ 150ºC
3.3 – 24 V
Output Leakage Current
IOFF Either output
– <1 10 µA
Supply Current
ICC
2.5 3.7 6.0 mA
Low Output Voltage
Middle Output Voltage4
Output Sink Current, Middle
Output Sink Current Limit
Chopping Frequency
Output Rise Time5
Output Fall Time5
Power-On Time6
Power-On State7
VOUT(ON)
VOUT(MID)
IOUT(MID)
IOM
fC
tr
tr
tON
POS
Transient Protection Characteristics
Supply Zener Clamp Voltages
Supply Zener Current8
Reverse Supply Current
VZ
IZ
IRCC
IOUT = 20 mA
B > BOP(A), B > BOP(B)
BRP < B < BOP, VPULL-UP = 12 V, RLOAD = 12 kΩ
BRP < B < BOP, VPULL-UP = 12 V, RLOAD = 12 kΩ
VCC = 12 V
CS = 20 pF, RLOAD = 820 Ω
CS = 20 pF, RLOAD = 820 Ω
t < tON
t ≥ tON
B=0G
BRP < B < BOP
B > BOP
B < BRP
ICC = 9 mA, TA = 25ºC
VS = 28 V
VRCC = –18 V, TJ < TJ(max)
– 185 500
–6–
– 0.5 –
30 – 70
– 750 –
– 1.8 –
– 1.2 –
– 50 65
VOUT(OFF)
VOUT(MID)
VOUT(ON)
VOUT(OFF)
28 46
–
– – 9.0
– 2 15
mV
V
mA
mA
kHz
µs
µs
µs
–
–
–
–
V
mA
mA
2 Output related specifications listed in the characteristic column are applicable to each output transistor unless otherwise noted.
3 Maximum voltage operation must not exceed maximum junction temperature. Refer to power de-rating curves.
4 VOUT(MID) and IOUT(MID) specified typical values are found when connected as shown in Figure 10 and Figure 11. This information is only guaranteed available before the
first magnetic field transition has occurred and after the power-on time has occurred. The output state transition from the t < tON POS and the t > tON POS is not considered
the first magnetic field transition. See Figure 1 and the Magnetic Truth Table for power-on behavior.
5 CS = oscilloscope probe capacitance
6 Power-On Time is the duration from when VCC rises above VCC(MIN) until both outputs have attained valid states.
7 POS for both outputs is undefined for VCC < VCC(MIN). Use of a VCC slew rate greater than 25 mV/µs is recommended.
8 Maximum specification limit is equivalent to ICC(MAX) + 3 mA.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
5 Page 
A1232
Ultra-Sensitive, Hall-Effect Speed
and Direction Sensor with TPOS
Magnetic Truth Table
Conditions
t < tON
t > tON
Power-On Time
has occurred and fields BE1
and BE2 have not yet each
transitioned
t > tON
&
BE1 and BE2 have already
each transitioned at least
one time
Magnetic Field BE1 at Hall Element E1
–
BE1 < BRP(A)
BE1 < BRP(A)
BE1 < BRP(A)
BRP(A) < BE1 < BOP(A)
BRP(A) < BE1 < BOP(A)
BRP(A) < BE1 < BOP(A)
BE1 > BOP(A)
BE1 > BOP(A)
BE1 > BOP(A)
Any
Key
L = VOUT(ON), Low
M = VOUT(MID), Middle
H = VOUT(OFF), High
SPD = High-Resolution Speed
DIR = Direction
X = Output Not Defined
Magnetic Field BE2 at hall Element E2
–
BE2 < BRP(B)
BRP(B) < BE2 < BOP(B)
BE2 > BOP(B)
BE2 < BRP(B)
BRP(B) < BE2 < BOP(B)
BE2 > BOP(B)
BE2 < BRP(B)
BRP(B) < BE2 < BOP(B)
BE2 > BOP(B)
Any
OUTA
X
H
H
H
M
M
M
L
L
L
OUTB
X
H
M
L
H
M
L
H
M
L
SPD
DIR
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet A1232.PDF ] | |
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