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PDF UGN3055U Data sheet ( Hoja de datos )
| Número de pieza | UGN3055U | |
| Descripción | MULTIPLEXED TWO-WIRE HALL-EFFECT SENSOR ICs | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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3055
MULTIPLEXED
3055TWO-WIRE HALL EFFECT
SENSOR IC
DISCONTINUED PRODUCT
Shown for Reference Only
LOGIC
12
3
Dwg. PH-005
MULTIPLEXED TWO-WIRE
HALL-EFFECT SENSOR ICs
The UGN3055U Hall-effect sensor is a digital magnetic sensing IC
capable of communicating over a two-wire power/signal bus. Using a
sequential addressing scheme, the device responds 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.
The device consists of high-resolution bipolar Hall-effect switching
circuitry, the output of which drives high-density CMOS logic stages.
These 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 BiMOS fabrication technology.
This unique magnetic sensing IC operates within specifications
between -20°C and +85°C. Alternate magnetic and temperature
specifications are available upon request. It is supplied in a 60 mil
(1.54 mm) thick, three-pin plastic SIP. Each package is clearly marked
with a two-digit decimal device address (xx).
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
at TA = +25°C
Supply Voltage, VBUS ........................... 24 V
Magnetic Flux Density, B ............ Unlimited
Operating Temperature Range,
TA .......................... -20°C to +85°C
Storage Temperature Range,
TS .............................. -55°C to +150°C
Package Power Dissipation,
PD .................................... 750 mW
FEATURES
s Complete Multiplexed Hall-Effect IC 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 BiMOS Technology Favors
Battery-Powered and Mobile Applications
s Ideal for Automotive, Consumer, and Industrial Applications
Always order by complete part number: UGN3055U .
1 page  
3055
MULTIPLEXED
TWO-WIRE HALL EFFECT
SENSOR IC
the overall bus current drain. When no
sensors are addressed, the net bus current
drain is the sum of quiescent currents of all
sensors on the bus (for ‘n’ sensors, the bus
quiescent current drain is n * IQ).
Bus Issues
At present, a maximum of 30 active sensors
can coexist on the same bus, each with a
different address. Address 0 is reserved for
bus current calibration in software. This
feature allows for fail-safe detection of signal
current and eliminates detection problems
caused by low signal current (IS), the opera-
tion of sensors at various ambient tempera-
tures, lot-to-lot variation of quiescent current,
and the addition and replacement of sensors
to the bus while in the field. Address 31 is
designed to be inactive to allow for further
address expansion of the bus (to 62 maxi-
mum addresses). In order to repeat the
address cycle, the bus must be reset as
shown in Figure 1 by bringing the supply
voltage to below VRST. Sensors have been
designed not to ‘wrap-around’.
Magnetic Sensing
The sensor IC has been designed to respond
to an external magnetic field whose magnetic
strength is greater than BOP. It accomplishes
this by amplifying the output of an on-chip
Hall transducer and feeding it into a threshold
detector. In order that bus current is kept to
a minimum, the transducer and amplification
circuitry is kept powered down until the
sensor is addressed. Hence, the magnetic
status is evaluated only when the sensor is
addressed.
External Switch Sensing
The third pin of the IC (pin 3) may be used to
detect the status of an external switch when
magnetic field sensing is not desired (and in
the absence of a magnetic field). The
allowable states for the switch are ‘open’ and
‘closed’ (shorted to sensor ground).
APPLICATIONS NOTES
Magnetic Actuation
The left side of Figure 2 shows the wiring of the UGN3055U when
used as a magnetic threshold detector. Pin 1 of the sensor is wired to
the positive terminal of the bus, pin 2 is connected to the bus negative
terminal, and pin 3 has no connection.
Mechanical Actuation
The right side of Figure 2 shows the wiring of the UGN3055U when
used to detect the status of a mechanical switch. In this case, pin 3 is
connected to the positive terminal of the switch. The negative side of
the switch is connected to the negative terminal of the bus. When the
mechanical switch is closed (shorted to ground) and the correct bus
address is detected by the IC, the sensor responds with a signal
current. If the switch is open, only a diagnostic current is returned.
FIGURE 2
SENSOR CONNECTIONS
POSITIVE BUS SUPPLY
XX
12 3
NC
12 3
BUS RETURN
SWITCH
Dwg. EH-004
5 Page | ||
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| PDF Descargar | [ Datasheet UGN3055U.PDF ] | |
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