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Details, datasheet, quote on part number:A3054KU-15
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Datasheet text preview:
3054
MULTIPLEXED TWO-WIRE HALL - EFFECT SENSOR ICs
The A3054KU and A3054SU Hall-effect sensors are digital magnetic sensing ICs 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. Each device consists of high-resolution bipolar Hall-effect switching 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 magneticfield or switch-status sensing, low-noise amplification of the Halltransducer output, and high-density decoding and control logic is made possible by the development of a new sensor DABiCTM (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 temperature 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 specifications 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).
Data Sheet 27680.1*
LOGIC
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
T C y. Ul D on O R ce Pn D re Ee U ef IN r r T N fo On Cw IS o Dh S --
1 2 3
GROUND BUS
Dwg. PH-005
SWITCH IN
X
FEATURES
s s s s s s s
Complete Multiplexed Hall-Effect ICs with Simple Sequential Addressing Protocol Allows Power and Communication Over a Two-Wire Bus (Supply/Signal and Ground) Up to 30 Hall-Effect Sensors Can Share a Bus Sensor Diagnostic Capabilities Magnetic-Field or Switch-Status Sensing Low Power of DABiC Technology Favors Battery-Powered and Mobile Applications Ideal for Automotive, Consumer, and Industrial Applications
Always order by complete part number: Part Number A3054KU-XX A3054SU-XX -40°C to +125°C -20°C to +85°C
Operating Temperature Range
where XX = address (01, 02, ... 29, 30).
3054 MULTIPLEXED TWO-WIRE HALL - EFFECT SENSOR ICs
ELECTRICAL CHARACTERISTICS over operating temperature range.
Limits Characteristic Power Supply Voltage Signal Current Quiescent Current Symbol V BUS IS IQ L IQ H IQ Address Range Clock Thresholds Addr V CLH V CHL V CHYS Max. Clock Frequency* Address LOW Voltage Address HIGH Voltage Reset Voltage Propagation Delay* fC L K VL VH VRST tp l h tp h l Pin 3-2 Resistance RSWH R SWL Pin 3-2 Output Voltage VSWH VSWL LOW to HIGH HIGH to LOW DUT Addressed, B 300 G DUT Addressed, B 300 G DUT Addressed, B > 300 G VBUS = 6 V VBUS = 9 V IQ L I Q H Factory Specified LOW to HIGH HIGH to LOW Hysteresis 50% Duty Cycle Test Conditions Min -- 12 -- -- -- 1 -- 6.5 -- 2.5 VRST VCLH 2.5 10 -- -- -- -- -- Typ -- 15 1.5 1.4 100 -- -- -- 0.8 -- 6.0 9.0 3.5 20 5.0 50 200 3.9 30 Max 15 20 2.5 2.5 300 30 8.5 -- -- -- VCHL V BUS 5.5 30 10 -- -- -- -- Units V mA mA mA µA -- V V V kHz V V V µs µs k V mV
MAGNETIC CHARACTERISTICS over operating temperature range.
Limits Characteristic Magnetic Threshold Symbol BOP BRP Hysteresis B HYS Test Conditions Turn-On Turn-Off BOP BRP Min. 50 5.0 5.0 Typ. 150 100 50 Max. 300 295 -- Units G G G
Typical Data is at TA = +25°C and is for design information only. *This parameter, although warranteed, is not production tested. Alternative magnetic switch point specifications are available on special order. Please contact the factory.
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115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1995, 2001 Allegro MicroSystems, Inc.
3054 MULTIPLEXED TWO-WIRE HALL -EFFECT SENSOR ICs
(±0.005" [0.13 mm] die placement)
ACTIVE AREA DEPTH 0.0165" 0.42 mm NOM 0.090" 2.29 mm
SENSOR LOCATION
FUNCTIONAL BLOCK DIAGRAM
1
BUS
REG
0.073" 1.85 mm
COMP
COMP
CLOCK
CMOS LOGIC
RESET
A
BRANDED SURFACE 1 2 3
2
Dwg. MH-002-10B
3
SWITCH IN (OPTIONAL)
GROUND
Dwg. FH-009
DEFINITION OF TERMS
Sensor Address Each bus sensor has a factory-specified predefined address. At present, allowable sensor addresses are integers from 01 to 30. LOW-to-HlGH Clock Threshold (VCLH) Minimum voltage required during the positive-going transition to increment the bus address and trigger a diagnostic response from the bus sensors. This is also the maximum threshold of the on-chip comparator that monitors the supply voltage, VBUS. HlGH-to-LOW Threshold (VHL) Maximum voltage required during the negative-going transition to trigger a signal current response from the bus sensors. This is also the maximum threshold of the on-chip comparator that monitors the supply voltage, VBUS. Bus HIGH Voltage (VH) Bus HIGH voltage during addressing. Voltage should be greater than VCLH. Address LOW Voltage (VL) Bus LOW voltage during addressing. Voltage should be greater than VRST and less than VCHL. Bus Reset Voltage (VRST) Voltage level while resetting sensors. Sensor Quiescent Current Drain (IQ) The current drain of bus sensors when active but not addressed. IQH is the quiescent current drain when the sensor is not addressed and is at VH IQL is the quiescent current drain when the sensor is not addressed and is at VL. Note that IQL is greater than IQH. Diagnostic Phase Period on the bus when the address voltage is at VH. During this period, a correctly addressed sensor responds by increasing its current drain on the bus. This response from the sensor is called the diagnostic response and the bus current increase is called the diagnostic current. Signal Phase Period on the bus when the address voltage is at VL. During this period, a correctly addressed sensor that detects a magnetic field greater than the magnetic operate point, BOP, responds by maintaining a current drain of IS on the bus. This response from the sensor is called the signal response and the bus current is called the signal current. Sensor Address Response Current (IS) Sensor current during the diagnostic and the signal responses of the bus sensor. This is accomplished by enabling an internal constant-current source.
Allegro
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3054 MULTIPLEXED TWO-WIRE HALL - EFFECT SENSOR ICs
ADDRESSING PROTOCOL
Magnetic Operate Point (BOP) Minimum magnetic field required to switch ON the Hall amplifier and switching circuitry of the addressed sensor. This circuitry is only active when the sensor is addressed. Magnetic Release Point (BRP) Magnetic field required to switch OFF the Hall amplifier and switching circuitry after the output has been switched ON. When a device is deactivated by changing the bus address, all magnetic memory is lost. Magnetic Hysteresis (BHYS) Difference between the BOP and BRP magnetic field thresholds. A device may be addressed by changing the supply voltage as shown in Figure 1. A preferred addressing protocol is as follows: the bus supply voltage is brought low (<2.5 V) so that all devices on the bus are reset. The voltage is then raised to the address LOW voltage (VL) and the bus quiescent current is measured. The bus is then toggled between VL and VH (address HIGH voltage), with each positive transition representing an increment in the bus address. After each voltage transition, the bus current may be monitored to check for diagnostic and signal responses from sensor ICs. Sensor Addressing When a sensor detects a bus address equal to its factory-programmed address, it responds with an increase in its supply current drain ( IS) during the next HIGH portion
FIGURE 1
BUS TIMING
V H V CLH
DIAGNOSTIC ADDRESS 01
DIAGNOSTIC ADDRESS 02
DIAGNOSTIC ADDRESS 03
DIAGNOSTIC ADDRESS 04
DIAGNOSTIC ADDRESS n
DIAGNOSTIC ADDRESS 01
BUS VOLTAGE
V CHL V L
RESET
V RST 0 t plh t phl
RESET
IS
SENSOR 02 -- DIAGNOSTIC CURRENT
SENSOR 02 CURRENT WITH NO MAGNETIC FIELD
I QL I QH 0
IS
SENSOR 03 -- DIAGNOSTIC AND SIGNAL CURRENTS
SENSOR 03 CURRENT WITH MAGNETIC FIELD
I QL I QH 0
I
S
TOTAL BUS CURRENT WITH MAGNETIC FIELD AT SENSOR 03
SENSOR 01 NOT PRESENT
n · I QL n · IQH 0
SENSOR 01 NOT PRESENT
Dwg. WH-005
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115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
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 diagnostic 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 represents 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 performed. 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
IN mA QUIESCENT CURRENT, I
O
1.5
1.0
T A = +25°C
0.5
0 0 3 6 9
BUS
12
15
SUPPLY VOLTAGE, V
IN VOLTS
Dwg. GH-045
FIGURE 2
SENSOR CONNECTIONS
POSITIVE BUS SUPPLY
X
X
1
2
3
1
2
3
NC SWITCH
BUS RETURN
Dwg. EH-004
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