3054

MULTIPLEXED

TWO-WIRE

HALL-EFFECT SENSOR ICs

FUNCTIONAL BLOCK DIAGRAM

SENSOR LOCATION

(

±0.005” [0.13 mm] die placement)

CLOCK

Dwg. FH-009

BUS

SWITCH IN

(OPTIONAL)

GROUND

CMOS LOGIC

REG

COMP

COMP

RESET

1

3

2

1

3

2

Dwg. MH-002-10A

0.015"

0.38 mm

NOM

BRANDED

SURFACE

ACTIVE AREA DEPTH

0.073"

1.85 mm

A

0.090"

2.29 mm

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.

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

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,

Bus HIGH voltage during addressing. Voltage should

Bus LOW voltage during addressing. Voltage should

Voltage level while resetting sensors.

The current drain of bus sensors when active but not

current drain when the sensor is not addressed and is at

Diagnostic Phase

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

During this period, a correctly addressed sensor that

detects a magnetic field greater than the magnetic oper-

signal response and the bus current is called the signal

current.

Sensor current during the

diagnostic and the signal

responses of the bus sensor. This is accomplished by

enabling an internal constant-current source.