ATS673 Datasheet | Allegro MicroSystems

Features and Benefits - - - - - - - - - - Tight timing accuracy over operating temperature range True zero-speed operation TPOS (True Power-On State) Air-gap-independent switchpoints High immunity to vibration Large operating air gaps Operation with supply voltages down to 3.3 V Digital output representing target profile Single-chip solution for high reliability Optimized Hall IC/magnet system Description Recognizing the increasingly stringent requirements for EMC/ EMI in automotive applications, Allegro has taken the necessary steps to design devices that are capable of withstanding the effects of radiated and conducted transients. The ATS673 and ATS674 devices have been designed specifically for this purpose. Advanced circuitry on the die allows them to survive positive and negative transient pulses on both the input and output. The ATS673 and ATS674 devices retain all of the same characteristics as the ATS671 and ATS672. The devices remain true zero-speed gear tooth sensors with optimized Hall IC/ magnet configuration in an SIP (single in-line package). The SIP assembly consists of a molded package that holds together a samarium cobalt magnet, a pole piece, and a true zero-speed Hall IC that has been optimized to the magnetic circuit. Continued on the next page… Packages: 4 pin SIP (suffix SE) The sensor incorporates a single element Hall IC that switches in response to magnetic signals created by a ferrous target. The IC contains a sophisticated digital circuit designed to eliminate the detrimental effects of magnet and system offsets. Signal processing is used to provide zero-speed .. Continued on the next page… Not to scale Functional Block Diagram V+ VCC Voltage Regulator (Analog) VREG(A) Voltage Regulator (Digital) VREG(D) Hall Amp Offset Adjust Temperature Coefficient Adjust Automatic Gain Control LPF VPROC Offset VREF 9-Bit PDAC 9 p_P 0.1 μF CBYPASS Continuous Update Logic Output State Clock Continuous Update Logic p_N Output State 9-Bit...