DESCRIPTION

The ATS16951PSM is an optimized giant magnetoresistance

(GMR) integrated circuit (IC) and permanent magnet pellet

combined with integrated EMC protection components to

provide a user-friendly solution for digital gear tooth sensing.

The small package can be easily assembled and used in

conjunction with a wide variety of gear tooth targets and is

intended for automotive crankshaft applications.

The device incorporates multiple GMR elements into a single

IC that switches in response to differential magnetic signals

created by a ferromagnetic target. The IC contains a sophisticated

compensation circuit designed to eliminate detrimental effects

of magnet and system offsets. Digital processing of the analog

signal provides high performance independent of air gap

and allows for dynamic adaptation of device performance to

address the typical operating conditions found in automotive

applications. Threshold hysteresis reduces the negative effects of

any anomalies in the magnetic signal associated with system or

target anomalies typically seen in many automotive applications.

The ATS16951PSM is being developed in accordance with

ISO 26262 as a safety element out of context targeting ASIL B

capability (pending assessment) for use in automotive safety-

related systems when integrated and used in the manner

prescribed in the applicable safety manual and datasheet.

The ATS16951PSM is available in a 3-pin package (SM) that

is lead (Pb) free, with NiPdAu plating.

ATS16951PSM-DS, Rev. 1

MCO-0001173

FEATURES AND BENEFITS

• GMR technology integrates high sensitivity MR

(magnetoresistive) sensor elements and high precision

BiCMOS circuits on a single silicon integrated circuit,

offering high accuracy, low magnetic field operation

• Allegro SM package with integrated EMC components

reduces need for external EMI protection

• ASIL B safety design process with integrated diagnostics

(pending assessment)

• Integrated back-biasing magnetic circuit

• Digital speed and direction output provides ferromagnetic

target position information

• Enhanced algorithm for low jitter, high output accuracy

performance, and vibration tolerance

• Center of package switching alignment option

• Programmable pulse location between center of target

feature or edge of target feature

• EEPROM programmable performance optimizations and

production traceability

• Target Profile Diagnostics™

GMR Speed and Direction Crankshaft Sensor

with Three-Wire, Pulse-Width Output

Figure 1: Functional Block Diagram

ATS16951PSM

Not to scale

PACKAGE:

VCC

GND

OUT

Output

Output

Controller

Synchronous Digital Controller

Diagnostics

EEPROM

Oscillator

Temperature

Sensor

EMC

Regulator

(Analog)

Regulator

(Digital)

GMR Yokes

ADC

ADC

Amp

Amp

December 17, 2021

3-pin SIP (suffix SM)