A3054KU-22_技术文档

3054

MULTIPLEXED

TWO-WIRE

3054

HALL-EFFECT SENSOR ICs

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.

X

LOGIC

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.

1

2

3

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).

Dwg. PH-005

Pinning is shown viewed from branded side.

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

ABSOLUTE MAXIMUM RATINGS

at T = +25°C

A

■ Magnetic-Field or Switch-Status Sensing

■ Low Power of DABiC Technology Favors

Battery-Powered and Mobile Applications

■ Ideal for Automotive, Consumer, and Industrial Applications

Supply Voltage, V_BUS. . . . . . . . . . . . . . 18 V

Magnetic Flux Density, B . . . . . . . Unlimited

Operating Temperature Range, T_A

A3054KU . . . . . . . . . . . -40°C to +125°C

A3054SU . . . . . . . . . . . . -20°C to +85°C

Storage Temperature Range,

Always order by complete part number:

Part Number Operating Temperature Range

A3054KU-XX -40°C to +125°C

T_S. . . . . . . . . . . . . . . . . -55°C to +150°C

Package Power Dissipation,

A3054SU-XX -20°C to +85°C

P_D. . . . . . . . . . . . . . . . . . . . . . . 635 mW

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

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HALL-EFFECT SENSOR ICs

ELECTRICAL CHARACTERISTICS over operating temperature range.

Limits

Max

Characteristic

Symbol

V_BUS

I_S

Test Conditions

Min

—

Typ

—

Units

V

Power Supply Voltage

Signal Current

15

20

DUT Addressed, B > 300 G

V_BUS= 6 V

12

—

15

mA

µA

—

Quiescent Current

I_QL

1.5

1.4

100

—

2.5

300

30

I_QH

V_BUS= 9 V

—

∆I_Q

I_QL– I_QH

—

Address Range

Addr

V_CLH

V_CHL

V_CHYS

f_CLK

Factory Specified

LOW to HIGH

HIGH to LOW

Hysteresis

1

Clock Thresholds

—

8.5

—

V

6.5

—

V

0.8

—

V

Max. Clock Frequency*

Address LOW Voltage

Address HIGH Voltage

Reset Voltage

50% Duty Cycle

2.5

V_RST

V_CLH

2.5

10

—

kHz

V

V_L

6.0

9.0

3.5

20

V_CHL

V_BUS

5.5

30

V_H

V

V_RST

t_plh

V

Propagation Delay*

LOW to HIGH

µs

kΩ

Ω

t_phl

HIGH to LOW

5.0

50

10

Pin 3-2 Resistance

R_SWH

R_SWL

V_SWH

V_SWL

DUT Addressed, B < 5 G

DUT Addressed, B > 300 G

DUT Addressed, B < 5 G

DUT Addressed, B> 300 G

—

200

3.9

30

—

Pin 3-2 Output Voltage

—

V

—

mV

MAGNETIC CHARACTERISTICS over operating temperature range.

Limits

Characteristic

Symbol

B_OP

Test Conditions

Turn-On

Min.

50

Typ.

150

100

50

Max.

300

295

—

Units

G

Magnetic Threshold†

B_RP

Turn-Off

5.0

G

Hysteresis

B_HYS

B_OP– B_RP

G

Typical Data is at T_A= +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 (508) 853-5000

3054

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HALL-EFFECT SENSOR ICs

SENSOR LOCATION

FUNCTIONAL BLOCK DIAGRAM

(±0.005” [0.13 mm] die placement)

1

BUS

ACTIVE AREA DEPTH

0.015"

0.090"

0.38 mm

2.29 mm

NOM

REG

COMP

0.073"

1.85 mm

RESET

CLOCK

CMOS LOGIC

SWITCH IN

(OPTIONAL)

3

A

BRANDED

SURFACE

1

2

3

2

GROUND

Dwg. FH-009

Dwg. MH-002-10A

DEFINITION OF TERMS

Sensor Address

Sensor Quiescent Current Drain (I_Q)

Each bus sensor has a factory-specified predefined

address. At present, allowable sensor addresses are

integers from 01 to 30.

The current drain of bus sensors when active but not

addressed. I_QHis the quiescent current drain when the

sensor is not addressed and is at V_HI_QLis the quiescent

current drain when the sensor is not addressed and is at

LOW-to-HlGH Clock Threshold (V_CLH

)

V_L. Note that I_QLis greater than I_QH

.

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

Diagnostic Phase

Period on the bus when the address voltage is at V_H.

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.

monitors the supply voltage, V_BUS

.

HlGH-to-LOW Threshold (V_HL)

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,

Signal Phase

Period on the bus when the address voltage is at V_L.

During this period, a correctly addressed sensor that

detects a magnetic field greater than the magnetic oper-

ate point, B_OP, responds by maintaining a current drain of

I_Son the bus. This response from the sensor is called the

signal response and the bus current is called the signal

current.

V_BUS

.

Bus HIGH Voltage (V_H)

Bus HIGH voltage during addressing. Voltage should

be greater than V_CLH

.

Sensor Address Response Current (I_S)

Address LOW Voltage (V_L)

Sensor current during the diagnostic and the signal

responses of the bus sensor. This is accomplished by

enabling an internal constant-current source.

Bus LOW voltage during addressing. Voltage should

be greater than V_RSTand less than V_CHL

.

Bus Reset Voltage (V_RST

)

Voltage level while resetting sensors.

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HALL-EFFECT SENSOR ICs

ADDRESSING PROTOCOL

Magnetic Operate Point (B_OP

)

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 (V_L) and

the bus quiescent current is measured. The bus is then

toggled between V_Land V_H(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.

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 (B_RP

)

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.

Sensor Addressing

Magnetic Hysteresis (B_HYS

Difference between the B_OPand B_RPmagnetic field

thresholds.

)

When a sensor detects a bus address equal to its

factory-programmed address, it responds with an increase

in its supply current drain ( I_S) during the next HIGH portion

FIGURE 1

BUS TIMING

DIAGNOSTIC

ADDRESS

DIAGNOSTIC

ADDRESS 01

DIAGNOSTIC

ADDRESS 02

DIAGNOSTIC

ADDRESS 03

DIAGNOSTIC

ADDRESS 04

DIAGNOSTIC

ADDRESS 01

n

V

H

V

CLH

CHL

V

BUS

VOLTAGE

L

RESET

V

RST

0

t

phl

plh

SENSOR 02 —

DIAGNOSTIC CURRENT

I

S

SENSOR 02

CURRENT

WITH NO

MAGNETIC

FIELD

I

QL

I

QH

0

SENSOR 03 — DIAGNOSTIC

AND SIGNAL CURRENTS

I

S

SENSOR 03

CURRENT

WITH

MAGNETIC

FIELD

I

QL

I

QH

0

I

S

TOTAL

BUS CURRENT

WITH

MAGNETIC

FIELD AT

SENSOR 01

NOT PRESENT

SENSOR 01

NOT PRESENT

n • I

QL

SENSOR 03

QH

0

Dwg. WH-005

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 diag-

nostic response. If the sensor detects an

ambient magnetic field, it continues with I_S

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 I_Q.

TYPICAL DEVICE QUIESCENT CURRENT

2.0

1.5

1.0

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 • I_Q).

T

= +25°C

A

0.5

0

3

6

0

9

12

15

SUPPLY VOLTAGE, V

IN VOLTS

BUS

Dwg. GH-045

FIGURE 2

SENSOR CONNECTIONS

POSITIVE BUS SUPPLY

X

Bus Issues

1

2

3

1

2

3

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 (I_S), 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

NC

SWITCH

BUS RETURN

Dwg. EH-004

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FIGURE 3

BUS INTERCONNECTION

(POSITIVE) BUS SUPPLY

ADDRESS

RESET

01

02

28

29

30

ANALOG OUT

BUS RETURN

Dwg. EH-005

31 is designed to be inactive to allow for

further address expansion of the bus (to 62

maximum 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 V_RST. Sensors have been

designed not to ‘wrap-around’.

APPLICATIONS NOTES

Magnetic Actuation

The left side of Figure 2 shows the wiring of an A3054KU or

A3054SU 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.

Magnetic Sensing

Mechanical Actuation

The sensor IC has been designed to

respond to an external magnetic field whose

magnetic strength is greater than B_OP. It

accomplishes this by amplifying the output of

an on-chip Hall transducer and applying it to

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.

The right side of Figure 2 shows the wiring of an A3054KU or

A3054SU when used to detect the status of a mechanical switch.

In this case, pin 3 is connected to the switch. The other side of the

switch is connected to the bus return (negative bus supply or ground).

When the mechanical switch is closed, and the correct bus address is

detected by the IC, the sensor responds with a signal current. If the

switch is open, only the diagnostic current is returned.

Bus Configuration

A maximum of 30 individually addresable sensors may be con-

nected across the same two-wire bus as shown in Figure 3. It is

recommended that the sensors use a dedicated digital ground wire to

minimize the effects of changing ground potential (as in the case of

chassis ground in the automotive industry).

External Switch Sensing

Pin 3 of the IC 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’ or ‘closed’

(shorted to sensor ground).

The bus was not designed to require two-wire twisted pair wiring to

the sensors. However, in areas of extreme electromagnetic interfer-

ence, 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.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

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Bus Driver

• The microprocessor can also be used to filter out random line noise

by digitally filtering the bus responses.

It is recommended that the bus be controlled

by microprocessor-based hardware for the

following reasons:

• The microprocessor can easily keep track of the signal responses

and initiate the appropriate action (e.g., light a lamp or sound an

alarm, and also pinpoint the location of the signal).

• Sensor address information may be stored

in ROM in the form of a look-up table.

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.

• Bus faults can be pinpointed by the

microprocessor by comparing the diagnos-

tic response to the expected response in

the ROM look-up table.

Interface Schematic

The bus driver is easily designed using a few operational amplifi-

ers, resistors, and transistors. Figure 4 shows a schematic of a

recommended bus driver circuit that is capable of providing 6 V to 9 V

transitions, resetting the bus, and providing an analog measurement of

the bus current for the A/D input of the microprocessor.

• 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.

FIGURE 4

BUS INTERFACE SCHEMATIC

+15 V

1 kΩ

10 kΩ R ₄

1 kΩ

Q₃

9 V

Z ₁

0.001

µF

OP₁

BUS SUPPLY

20 kΩ

R ₅

50 Ω

R ₆

X

ADDRESS

RESET

5 kΩ

Q₂

Q₁

1

2

3

1

2

3

50 kΩ

R ₈

50 kΩ

R₇

NC

SWITCH

BUS RETURN

100 kΩ

R ₉

ANALOG OUT

OP₂

100 kΩ

R₁₀

Dwg. EH-003A

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In Figure 4, the ADDRESS input provides a TTL-compatible input

to control the bus supply. A HIGH (5 V) input switches Q₁ON and sets

the bus voltage to 6 V through the resistor divider R₄, R₅, and Zener

Z₁. A LOW input switches Q₁OFF and sets the bus voltage to 9 V

(Z₁). This voltage is fed into the positive input of the operational

amplifier OP₁and 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 the RESET input is HIGH, Q₂is switched ON

and the positive input of the operational amplifier is set to the satura-

tion 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 I_BUS• R₆). The amplifier,

OP₂, is a standard differential amplifier of gain R₉/R₇(provided that R₇

= R₈, R₉= R₁₀). The gain of the total transim-pedance amplifier is

given by:

V_OUT= I_BUS• R₆• R₉/R₇

This voltage is available at the ANALOG OUT terminal.

Bus Control Software

The processing of the bus current (available at ANALOG OUT) is

best done by feeding it into the A/D input of a microprocessor. If the

flexibility provided by a microprocessor is not desired, this signal could

be fed into threshold detection circuitry; e.g., comparator, and the

output used to drive a display.

Related References

1. G. AVERY, “Two-Terminal Hall Sensor,” ASSIGNEE: Sprague

Electric Company, North Adams, MA, United States. Patent number

4,374,333; Feb. 1983.

2. T. WROBLEWSKI and F. MEISTERFIELD, “Switch Status

Monitoring System, Single-Wire Bus, Smart Sensor Arrangement

There Of,” ASSIGNEE: Chrysler Motor Corporation, Highland Park, Ml,

United States. Patent number 4,677,308; June 1987.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

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HALL-EFFECT SENSOR ICs

Dimensions in Inches

(controlling dimensions)

Dimensions in Millimeters

(for reference only)

0.183

0.178

4.65

4.52

0.063

0.059

1.60

1.50

0.181

0.176

4.60

4.47

45°

0.018

0.46

0.086

MAX

2.18

MAX

1

2

3

1

2

3

15.24

14.23

0.600

0.560

0.015

0.38

0.016

0.41

SEE NOTE

0.050

0.100

1.27

2.54

Dwg. MH-003D in

Dwg. MH-003D mm

NOTES: 1. Tolerances on package height and width represent allowable mold offsets.

Dimensions given are measured at the widest point (parting line).

2. Exact body and lead configuration at vendor’s option within limits shown.

3. Height does not include mold gate flash.

4. Recommended minimum PWB hole diameter to clear transition area is

0.035” (0.89 mm).

5. Where no tolerance is specified, dimension is nominal.

6. Minimum lead length was 0.500” (12.70 mm). If existing product to the

original specifications is not acceptable, contact sales office before

ordering.

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115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

3054

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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.

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HALL-EFFECT SENSOR ICs

HALL-EFFECT SENSORS SELECTION GUIDE

Partial Part

Number

Avail. Oper.

Temp.

Operate Limits Over Temp.

max min

B

OP

B

B min

hys

Function†

Notes

RP

3046

3054

3056

3058

3059

3060

3121

3122

3123

3132

3133

3134

3141

3142

3143

3144

3161

3175

3177

3185

3187

3188

3189

3195

3197

3235

E/L

K/S

E/L

K/S

E/L

K/L/S

E/L

E

+200

+300

+225

+300

+100

+35

+500

+430

+470

+95

-200

+5

-225

-300

-100

-35

+80

+120

+160

-95

15

5.0

15

150

20

10

60

70

30

10

20

30

20

5.0

80

50

Gear-Tooth Sensor

Unipolar Multiplex

Gear-Tooth Sensor

AC Gear-Tooth Sensor

Unipolar Switch

Bipolar Switch

1

+75

+50

-75

-40

Bipolar Switch

+175

+245

+355

+450

+160

+180

+150

+300

+175

+200

+250

+200

-200

+250

+300

+85

Typ. 1.3 mV/G

Typ. 5.0 mV/G

Typ. 2.5 mV/G

Typ. 5.0 mV/G

Typ. 2.5 mV/G

+150

+240

+10

+60

+150

+25

+30

-180

-150

-300

-175

-200

-250

-200

+15

-15

Unipolar Switch

2-Wire Unipolar Switch

Bipolar Latch

S

E/L

L

280

100

160

100

110

15

Bipolar Latch

2, 3

3

4

S

Unipolar Switch

Bipolar Latch

Direction Detection

Linear Sensor

Chopper-Stabilized Linear Sensor

900 mA Bipolar Latch

400 mA Bipolar Latch

300 mA Unipolar Switch

15

3275

3421

3422

3503

3515

3516

3517

3518

3625

3626

5140

S

-250

-300

-85

100

240

10

–

5

E/L

S

E/L

L/S

S

-150

+25

200*

20

3, 5, 6

3, 6

S

E

Operating Temperature Ranges:

C = 0°C to +70°C, S = -20°C to +85°C, E = -40°C to +85°C, K = -40°C to +125°C, L = -40°C to +150°C

Notes

1. Multiplexed two-wire sensor; after proper address, power/signal bus current indicates magnetic field condition.

2. Active pull down.

3. Protected.

4. Output 1 switches on south pole, output 2 switches on north pole for 2-phase, bifilar-wound, unipolar-driven brushless dc motor control.

5. Complementary outputs for 2-phase bifilar-wound, unipolar-driven brushless dc motor control.

6. Power driver output.

* Typical.

† Latches will not switch on removal of magnetic field; bipolar switches may switch on removal of field but require field reversal for reliable operation

over operating temperature range.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000


型号：	A3054KU-22
厂家：	ALLEGRO MICROSYSTEMS
描述：	Hall Effect Sensor, 0.5mT Min, 30mT Max, 3.90V, Rectangular, Through Hole Mount, 0.060 INCH, PLASTIC, SIP-3 输出元件传感器换能器
文件：	总12页 (文件大小：117K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

A3054KU-22 [ALLEGRO]

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