DESCRIPTION

TheA16601AC-coupled Hall-effect sensor IC is a monolithic

integrated circuit that switches in response to changing

differential magnetic fields created by rotating ring magnets

and,whencoupledwithamagnet,byferroustargets.Thedevice

is a true zero-crossing detector: the output switches precisely

when the difference in magnetic field strength between the

two Hall elements is zero. A unique dual-comparator scheme

provides for accurate switching at the zero crossing on both the

positive and negative-going regions of the differential signal

while using hysteresis to prevent false switching. The zero-

crossing nature of this device provides excellent repeatability

and accuracy for crankshaft applications.

Changes in field strength at the device face, which are

induced by a moving target, are sensed by the two integrated

Hall transducers. The transducers generate signals that are

differentiallyamplifiedbyon-chipelectronics.Thisdifferential

design provides immunity to radial vibration within the

operating air gap range of the A16601 by rejection of the

common mode signal. Steady-state magnet and system offsets

are eliminated using an on-chip differential band-pass filter.

This filter also provides relative immunity to interference from

electromagnetic sources.

FEATURES AND BENEFITS

• Integrated bypass capacitors reduce requirements for

external EMI protection components

• Resistant to mechanical and thermal stress

• Dual zero-crossing output signal

• Expanded operation range with magnet target from

20 Hz to 25 kHz

• Reverse battery protection

• Senses ring magnet or magnetic target motion

• Expanded temperature range : –40°C to 160°C

AC-Coupled Differential Crankshaft Speed Sensor IC

Continued on the next page…

Figure 1: Functional Block Diagram

A16601

Hall

Amp

Regulator

Bandpass Filter Integrated

Tracking Capacitor

VOUT

(Pin 3)

VCC

(Pin 1)

GND

(Pin 2)

Gain

Stage

Dual Hall

Transducers

Comparator

A16601-DS, Rev. 1

MCO-0000710

October 11, 2019

Not to scale

PACKAGE:

3-pin SIP (suffix UC)