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3054

MULTIPLEXED

TWO-WIRE

HALL-EFFECT SENSOR ICs

3054

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.

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.

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).

Data Sheet

27680.1

LOGIC

1

2

GROUND

BUS

Dwg. PH-005

Pinning is shown viewed from branded side.

SWITCH IN

ABSOLUTE MAXIMUM RATINGS

at T

A

= +25

°

C

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,

T

S

. . . . . . . . . . . . . . . . .

-55

°

C to +150

°

C

Package Power Dissipation,

P

D

. . . . . . . . . . . . . . . . . . . . . . .

635 mW

X

3

FEATURES

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

Operating Temperature Range

-40°C to +125°C

-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

Power Supply Voltage

Signal Current

Quiescent Current

Symbol

V

BUS

I

S

I

QL

I

QH

∆I

Q

Address Range

Clock Thresholds

Addr

V

CLH

V

CHL

V

CHYS

Max. Clock Frequency*

Address LOW Voltage

Address HIGH Voltage

Reset Voltage

Propagation Delay*

f

CLK

V

L

V

H

V

RST

t

plh

t

phl

Pin 3-2 Resistance

R

SWH

R

SWL

Pin 3-2 Output Voltage

V

SWH

V

SWL

LOW to HIGH

HIGH to LOW

DUT Addressed, B < 5 G

DUT Addressed, B > 300 G

DUT Addressed, B < 5 G

DUT Addressed, B> 300 G

DUT Addressed, B > 300 G

V

BUS

= 6 V

V

BUS

= 9 V

I

QL

– I

QH

Factory Specified

LOW to HIGH

HIGH to LOW

Hysteresis

50% Duty Cycle

Test Conditions

Min

—

12

—

1

—

6.5

—

2.5

V

RST

V

CLH

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

300

30

8.5

—

V

CHL

V

BUS

5.5

30

10

—

Units

V

mA

µA

—

V

kHz

V

µs

kΩ

Ω

V

mV

MAGNETIC CHARACTERISTICS over operating temperature range.

Limits

Characteristic

Magnetic Threshold†

Symbol

B

OP

B

RP

Hysteresis

B

HYS

Test Conditions

Turn-On

Turn-Off

B

OP

– B

RP

Min.

50

5.0

Typ.

150

100

50

Max.

300

295

—

Units

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

W

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

3054

MULTIPLEXED

TWO-WIRE

HALL-EFFECT SENSOR ICs

SENSOR LOCATION

(±0.005” [0.13 mm] die placement)

ACTIVE AREA DEPTH

0.015"

0.38 mm

NOM

0.090"

2.29 mm

FUNCTIONAL BLOCK DIAGRAM

1

BUS

REG

0.073"

1.85 mm

COMP

CLOCK

CMOS LOGIC

RESET

A

BRANDED

SURFACE

1

2

3

SWITCH IN

(OPTIONAL)

2

Dwg. MH-002-10A

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 (V

CLH

)

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, 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,

V

BUS

.

Bus HIGH Voltage (V

H

)

Bus HIGH voltage during addressing. Voltage should

be greater than V

CLH

.

Address LOW Voltage (V

L

)

Bus LOW voltage during addressing. Voltage should

be greater than V

RST

and less than V

CHL

.

Bus Reset Voltage (V

RST

)

Voltage level while resetting sensors.

Sensor Quiescent Current Drain (I

Q

)

The current drain of bus sensors when active but not

addressed. I

QH

is the quiescent current drain when the

sensor is not addressed and is at V

H

I

QL

is the quiescent

current drain when the sensor is not addressed and is at

V

L

. Note that I

QL

is greater than I

QH

.

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.

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

S

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 (I

S

)

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 (B

OP

)

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.

Magnetic Hysteresis (B

HYS

)

Difference between the B

OP

and B

RP

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 (V

L

) and

the bus quiescent current is measured. The bus is then

toggled between V

L

and 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.

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 ( I

S

) 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 • I QH

0

SENSOR 01

NOT PRESENT

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

.

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

).

Bus Issues

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

TYPICAL DEVICE QUIESCENT CURRENT

2.0

IN

Q

mA

QUIESCENT CURRENT, I

1.5

1.0

T

A

= +25°C

0.5

0

3

6

9

12

15

SUPPLY VOLTAGE, V

IN

BUS

VOLTS

Dwg. GH-045

FIGURE 2

SENSOR CONNECTIONS

POSITIVE BUS SUPPLY

X

1

2

3

1

2

3

NC

SWITCH

BUS RETURN

Dwg. EH-004

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