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3055 Schematic ( PDF Datasheet ) - Allegro MicroSystems

Teilenummer 3055
Beschreibung MULTIPLEXED TWO-WIRE HALL-EFFECT SENSOR ICs
Hersteller Allegro MicroSystems
Logo Allegro MicroSystems Logo 




Gesamt 8 Seiten
3055 Datasheet, Funktion
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 .






3055 Datasheet, Funktion
3055
MULTIPLEXED
TWO-WIRE HALL EFFECT
SENSOR IC
FIGURE 3
BUS INTERCONNECTION
ADDRESS
RESET
ANALOG OUT
UGN3055U AND UGS3055U
M(PUOSLITITVEI) BPUSLSEUPXPLEY D TWO-WIRE HALL EF-
FECT SENSOR IC
01 02 28 29 30
BUS RETURN
Dwg. EH-005
Bus Configuration
A maximum of 30 sensors may be connected
across the same two wire bus as shown in
Figure 3. It is recommended that the sensors
use a dedicated digital ground wire to mini-
mize the effects of changing ground potential
(as in the case of chassis ground in the
automotive industry).
The bus was not designed to require two-wire
twisted-pair wiring to the sensors; however,
in areas of extreme EMI (electro-magnetic
interference), it may be advisable to install a
small bypass capacitor (0.01 µF for example)
between the supply and ground terminals of
each sensor instead of using the more
expensive wiring.
Bus Driver
It is recommended that the bus be controlled
by microprocessor-based hardware for the
following reasons:
• Sensor address information may be stored
in ROM in the form of a look up table.
• Bus faults can be pinpointed by the
microprocessor by comparing the diagnos-
tic response to the expected response in
the ROM look up table.
• The microprocessor, along with an A/D
converter, can also be used to self cali-
brate the quiescent currents in the bus and
hence be able to easily detect a signal
response.
• The microprocessor can also be used to filter out random line noise
by digitally filtering the bus responses.
• The microprocessor can easily keep track of the signal responses,
initiate the appropriate action; e.g., light a lamp, sound an alarm,
and also pinpoint the location of the signal.
Optimally, the microprocessor is used to control bus-driving circuitry
that will accept TTL level inputs to drive the bus and will return an
analog voltage representation of the bus current.
Interface Schematic
The bus driver is easily designed using a few operational amplifiers,
resistors, and transistors. Figure 4 shows a schematic of a recom-
mended bus driver circuit that is capable of providing 6 V to 9 V
transitions, resetting the bus, and providing an analog measurement of
the current for use by the A/D input of the microprocessor.
In Figure 4, the Address pin provides a TTL-compatible input that is
used to control the Bus supply. A HIGH (5 V) input switches Q1 ON
and sets the bus voltage to 6 V through the resistor divider R4, R5,
and the Zener Z1. A LOW input switches OFF Q2 and sets the bus
voltage to 9 V. This voltage is fed into the positive input of the opera-
tional amplifier OP1 and is buffered and made available at Bus Supply
(or sensor supply). Bus reset control is also available in the form of a
TTL-compatible input. When this input, which is marked Reset, is
HIGH, Q2 is switched ON and the positive input of the op amp is set to
the saturation voltage of the transistor (approximately 0 V). This resets
the bus.
A linear reading of the bus current is made possible by amplifying the
voltage generated across R6 (which is IBUS * R6). The amplifier, OP2,
is a standard differential amplifier of gain R9/R7 (provided that R7 =
R8, R9 = R10). The gain of the total transimpedance amplifier is given
by:
VOUT = IBUS * R6 * R9/R7
This voltage is available at the terminal marked Analog Out.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000

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