Allegro A3054SU-30, A3054SU-29, A3054SU-28, A3054SU-27, A3054SU-26 Datasheet

3054

MULTIPLEXED 3054 TWO-WIRE

HALL-EFFECT SENSOR ICs

Sheet Data 1.27680

X

LOGIC

1	2	3
BUS	GROUND	SWITCH IN
		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 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 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 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).

FEATURES

■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	Operating Temperature Range
A3054KU-XX	-40°C to +125°C
A3054SU-XX	-20°C to +85°C

where XX = address (01, 02, … 29, 30).

3054

MULTIPLEXED TWO-WIRE

HALL-EFFECT SENSOR ICs

ELECTRICAL CHARACTERISTICS over operating temperature range.

					Limits
Characteristic	Symbol	Test Conditions	Min	Typ	Max	Units
Power Supply Voltage	VBUS		—	—	15	V
Signal Current	IS	DUT Addressed, B > 300 G	12	15	20	mA
Quiescent Current	IQL	VBUS = 6 V	—	1.5	2.5	mA
	IQH	VBUS = 9 V	—	1.4	2.5	mA
	IQ	IQL – IQH	—	100	300	μA
Address Range	Addr	Factory Specified	1	—	30	—
Clock Thresholds	VCLH	LOW to HIGH	—	—	8.5	V
	VCHL	HIGH to LOW	6.5	—	—	V
	VCHYS	Hysteresis	—	0.8	—	V
Max. Clock Frequency*	fCLK	50% Duty Cycle	2.5	—	—	kHz
Address LOW Voltage	VL		VRST	6.0	VCHL	V
Address HIGH Voltage	VH		VCLH	9.0	VBUS	V
Reset Voltage	VRST		2.5	3.5	5.5	V
Propagation Delay*	tplh	LOW to HIGH	10	20	30	μs
	tphl	HIGH to LOW	—	5.0	10	μs
Pin 3-2 Resistance	RSWH	DUT Addressed, B < 5 G	—	50	—	kΩ
	RSWL	DUT Addressed, B > 300 G	—	200	—	Ω
Pin 3-2 Output Voltage	VSWH	DUT Addressed, B < 5 G	—	3.9	—	V
	VSWL	DUT Addressed, B> 300 G	—	30	—	mV
MAGNETIC CHARACTERISTICS over operating temperature range.
					Limits
Characteristic	Symbol	Test Conditions	Min.	Typ.	Max.	Units
Magnetic Threshold†	BOP	Turn-On	50	150	300	G
	BRP	Turn-Off	5.0	100	295	G
Hysteresis	BHYS	BOP – BRP	5.0	50	—	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.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 [phone]

Copyright © 1995 Allegro MicroSystems, Inc.

3054
MULTIPLEXED
TWO-WIRE
HALL-EFFECT SENSOR ICs
SENSOR LOCATION				FUNCTIONAL BLOCK DIAGRAM
(±0.005Ó [0.13 mm] die placement)				1	BUS
ACTIVE AREA DEPTH
0.015"			0.090"
0.38 mm
			2.29 mm
NOM
				REG
			0.073"	COMP	COMP
			1.85 mm
				CLOCK	RESET
				CMOS LOGIC
A					3	SWITCH IN
						(OPTIONAL)
BRANDED	1	2	3
SURFACE
				2	GROUND	Dwg. FH-009
			Dwg. MH-002-10A

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.

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
	DIAGNOSTIC	DIAGNOSTIC	DIAGNOSTIC	DIAGNOSTIC	DIAGNOSTIC	DIAGNOSTIC
	ADDRESS 01	ADDRESS 02	ADDRESS 03	ADDRESS 04	ADDRESS n	ADDRESS 01
	VH
	VCLH
BUS	VCHL
	VL
VOLTAGE
	RESET					RESET
	V RST
	0	t plh	t phl
	IS		SENSOR 02 —
			DIAGNOSTIC CURRENT
SENSOR 02
CURRENT
WITH NO
MAGNETIC
FIELD	I QL
	I QH
	0
			SENSOR 03 — DIAGNOSTIC
	I S		AND SIGNAL CURRENTS
SENSOR 03
CURRENT
WITH
MAGNETIC
FIELD	I QL
	I QH
	0
	IS
TOTAL
BUS CURRENT	SENSOR 01					SENSOR 01
WITH
	NOT PRESENT					NOT PRESENT
MAGNETIC
FIELD AT	n • I QL
SENSOR 03
	n • I QH
	0
						Dwg. WH-005

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 [phone]