A17201LUAA-I1 View Datasheet(PDF) - Allegro MicroSystems

Part Name

Description

Manufacturer

A17201LUAA-I1

Two-Wire AC-Coupled Differential Sensor IC with Integrated Filter Capacitor

Allegro MicroSystems 

A17201

Two-Wire AC-Coupled Differential Sensor IC

with Integrated Filter Capacitor

FEATURES AND BENEFITS

• Integrated tracking capacitor

• Integrated capacitor reduces requirements for external

EMI protection components (UB package)

• Used for sensing motion of ring magnet or ferrous targets

• Wide operating temperature range

• Operation with magnetic input signal frequency from

8 Hz to 20 kHz

• Large effective air gaps

• 3.5 to 24.0 V supply operating range

• Reverse battery protection

• Resistant to mechanical and thermal stress

PACKAGES:

3-pin SIP,

matrix HD style

(suffix UA)

2-pin SIP

(suffix UB)

Not to scale

DESCRIPTION

The A17201 is an AC-coupled Hall-effect sensor IC which

includes monolithic integrated circuits that switch in response

to changing differential magnetic fields created by rotating ring

magnets or, when coupled with a magnet, by ferrous targets.

This device also includes an integrated tracking capacitor

that provides the high accuracy of analog sensing without an

external filter capacitor. This reduces cost and components,

while improving the reliability of the final sensor solution.

Magnetic field changes affect the two integrated Hall

transducers and then are differentially amplified on the chip.

Differential design provides immunity to radial vibration,

within the device operating air gap range, by rejection of this

common-mode signal change. Steady-state system offsets are

eliminated using an on-chip differential bandpass filter with

integrated capacitor. This filter also provides relative immunity

to interference from electromagnetic sources. The device uses

advanced temperature compensation for the high-pass filter,

sensitivity, and Schmitt trigger switchpoints to guarantee

optimal operation to low frequencies over a wide range of air

gaps and temperatures.

Continued on next page...

VS+

VCC

(Pin 1)

2.2 nF

(UA Package Only)

Dual Hall

Transducers

Regulator

Hall

Amp

Gain

Stage

Bandpass Filter Integrated

Tracking Capacitor

VREF

Comparator

Output

Control

A17201-DS, Rev. 3

MCO-0000390

UA Package: GND (Pin 2 or Pin 3)

UB Package: GND (Pin 2)

Figure 1: Functional Block Diagram

April 12, 2019

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