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PDF A3054SU Data sheet ( Hoja de datos )
| Número de pieza | A3054SU | |
| Descripción | MULTIPLEXED TWO-WIRE HALL-EFFECT SENSOR ICs | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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3054
MULTIPLEXED
TWO-WIRE
3054
HALL-EFFECT SENSOR ICs
LOGIC
12
3
Dwg. PH-005
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
at TA = +25°C
Supply Voltage, VBUS . . . . . . . . . . . . . . 18 V
Magnetic Flux Density, B . . . . . . . Unlimited
Operating Temperature Range, TA
A3054KU . . . . . . . . . . . -40°C to +125°C
A3054SU . . . . . . . . . . . . -20°C to +85°C
Storage Temperature Range,
TS . . . . . . . . . . . . . . . . . -55°C to +150°C
Package Power Dissipation,
PD . . . . . . . . . . . . . . . . . . . . . . . 635 mW
MULTIPLEXED TWO-WIRE
HALL-EFFECT SENSOR ICs
The A3054KU and A3054SU Hall-effect sensors are digital mag-
netic sensing ICs capable of communicating over a two-wire power/
signal bus. Using a sequential addressing scheme, the device re-
sponds to a signal on the bus and returns the diagnostic status of the
IC, as well as the status of each monitored external magnetic field.
As many as 30 sensors can function on the same two-wire bus. This
IC is ideal for multiple sensor applications where minimizing the wiring
harness size is desirable or essential.
Each device consists of high-resolution bipolar Hall-effect switch-
ing circuitry, the output of which drives high-density CMOS logic
stages. The logic stages decode the address pulse and enable a
response at the appropriate address. The combination of magnetic-
field or switch-status sensing, low-noise amplification of the Hall-
transducer output, and high-density decoding and control logic is made
possible by the development of a new sensor DABiC™ (digital analog
bipolar CMOS) fabrication technology. The A3054SU is an improved
replacement for the original UGN3055U.
These unique magnetic sensing ICs are available in two tempera-
ture ranges; the A3054SU operates within specifications between
-20°C and +85°C, while the A3054KU is rated for operation between
-40°C and +125°C. Alternative magnetic and temperature specifica-
tions are available on special order. Both versions are supplied in
0.060" (1.54 mm) thick, three-pin plastic SIPs. Each device is clearly
marked with a two-digit device address (XX).
FEATURES
s Complete Multiplexed Hall-Effect ICs with
Simple Sequential Addressing Protocol
s Allows Power and Communication Over a
Two-Wire Bus (Supply/Signal and Ground)
s Up to 30 Hall-Effect Sensors Can Share a Bus
s Sensor Diagnostic Capabilities
s Magnetic-Field or Switch-Status Sensing
s Low Power of DABiC Technology Favors
Battery-Powered and Mobile Applications
s Ideal for Automotive, Consumer, and Industrial Applications
Always order by complete part number:
Part Number Operating Temperature Range
A3054KU-XX -40°C to +125°C
A3054SU-XX -20°C to +85°C
where XX = address (01, 02, … 29, 30).
1 page  
3054
MULTIPLEXED
TWO-WIRE
HALL-EFFECT SENSOR ICs
ofthe address cycle. This response may be
used as an indication that the sensor is "alive
and well" on the bus and is called the diag-
nostic response. If the sensor detects an
ambient magnetic field, it continues with IS
during the low portion of the address cycle.
This response from the sensor is called the
signal response. When the next positive
(address) transition is detected, the sensor
becomes disabled, and its contribution to the
bus signal current returns to IQ.
Bus Current
Figure 1 shows the addressing protocol.
The top trace represents the bus voltage
transitions as controlled by the bus driver
(see Applications Notes for an optimal bus
driver schematic). The second trace repre-
sents the bus current contribution of Sensor
02. The diagnostic response from the sensor
indicates that it detected its address on the
bus. However, no signal current is shown,
which indicates that sufficient magnetic field
is not detected at the chip surface and that
pin 3 is open circuited. The third trace
represents the current drain of Sensor 03
when a magnetic field is detected. Note both
the diagnostic and signal currents from the
sensor. The last trace represents the overall
bus current drain. When no sensors are
addressed, the net bus current is the sum of
quiescent currents of all sensors on the bus
(for 'n' sensors, the bus current drain is
n • IQ).
Bus Issues
After a reset, while at the address LOW
voltage (VL), and before the first address
pulse, bus current calibration may be per-
formed. This feature allows for fail-safe
detection of signal current and eliminates
detection problems caused by low signal
current (IS), the operation of sensors at
various ambient temperatures, lot-to-lot
variation of quiescent current, and the
addition or replacement of sensors to the bus
while in the field. At present, a maximum of
30 active sensors can coexist on the same
bus, each with a different address. Address
TYPICAL DEVICE QUIESCENT CURRENT
2.0
1.5
1.0
TA = +25°C
0.5
0
0 3 6 9 12 15
SUPPLY VOLTAGE, V BIUNSVOLTS
Dwg. GH-045
FIGURE 2
SENSOR CONNECTIONS
POSITIVE BUS SUPPLY
XX
12 3
NC
12 3
BUS RETURN
SWITCH
Dwg. EH-004
5 Page 
3054
MULTIPLEXED
TWO-WIRE
HALL-EFFECT SENSOR ICs
Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from
the detail specifications as may be required to permit improvements in the design of its products.
The information included herein is believed to be accurate and reliable. However, Allegro
MicroSystems, Inc. assumes no responsibility for its use; nor for any infringements of patents or
other rights of third parties which may result from its use.
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet A3054SU.PDF ] | |
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