(ATS673 / ATS674) Self-Calibrating TPOS Gear Tooth Sensor Optimized

ATS673 and ATS674 Self-Calibrating TPOS Gear Tooth Sensor Optimized for Automotive Cam Sensing Applications 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 www.DataSheet4U.com 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 TC VREF 9-Bit PDAC 9 Comp_P 0.1 μF CBYPASS Continuous Update Logic Output State Clock Continuous Update Logic Comp_N Output State 9-Bit Counter Clock 9-Bit Counter Threshold Output 9 9-Bit NDAC TPOS VREG(A) Power-On Reset VREG(D) Output Driver Threshold Comparator VOUT TPOS Trim GND (Recommended) TEST ATS673-DS, Rev. 1 ATS673 and ATS674 Self-Calibrating TPOS Gear Tooth Sensor Optimized for Automotive Cam Sensing Applications even in the presence of gear eccentricity. Hysteresis in the thresholds reduces the negative effects of anomalies in the magnetic signal (such as magnetic overshoot) associated with the targets used in many automotive applications. The ATS673 and 674 also include a low bandwidth filter that increases the noise immunity and the signal to noise ratio of the sensor. Two options are available for output polarity, low over tooth (LT) and high over tooth (HT). For applications requiring absolute accuracy use the ATS674. The ATS673 should be used for targets with high wobble. Features and Benefits (continued) ▪ AGC and reference adjust circuit ▪ Undervoltage lockout Description (continued) performance independent of air gap and also to dynamically adapt device performance to the typical operating conditions found in automotive applications, particularly cam sensing applications (reduced vibration sensitivity). High-resolution (9-bit) peak detecting DACs are used to set the adaptive switching thresholds of the devices, ensuring high accuracy Selection Guide Part Number ATS673LSETN-LT-T ATS673LSETN-HT-T ATS674LSETN-LT-T ATS674LSETN-HT-T 1Pb-based Pb-free1 Yes Yes Yes Yes VOUT (Over Tooth) Low High Low High Application High target wobble Packing2 13-in. reel, 450 pieces/reel High absolute edge detection accuracy variants are being phased out of the product line. Certain variants cited in this footnote are in production but have been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available. Status change: May 1, 2006. These variants include: ATS673LSETN-LT, ATS673LSETN-HT, ATS674LSETN-LT, and ATS674LSETN-HT. 2Contact Allegro for additional packing options. Absolute Maximum Ratings Characteristic Supply Voltage Reverse-Supply Voltage Continuous Output Current Reverse Output Current Operating Ambient Temperature Maximum Junction Temperature Storage Temperature Symbol VCC VRCC IOUT IROUT TA TJ(max) Tstg Range L Notes Rating 28 –18 20 50 –40 to 150 165 –65 to 170 Units V V mA mA ºC ºC ºC Pin-out Diagram Terminal List Name VCC VOUT TEST GND Device output For Allegro use, float or tie to GND Ground terminal Description Connects power supply to chip Number 1 2 3 4 12 34 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 2 ATS673 and ATS674 Self-Calibrating TPOS Gear Tooth Sensor Optimized for Automotive Cam Sensing Applications OPERATING CHARACTERISTICS Valid at TA = –40°C to 150°C, TJ ≤ TJ(max), over full range of AG, unless otherwise noted Characteristic Supply Voltage Undervoltage Lockout Supply Zener Clamp Voltage Supply Zener Current2 Supply Current Reverse Supply Current POWER-ON CHARACTERISTICS Power-On Time3 OUTPUT CHARACTERISTICS Low Output Voltage Output Zener Voltage Output Current Limit Output Leakage Current Output Rise Time Output Fall Time VOUT(Sat) VZOUT IOUTLIM IOUTOFF tr tf VOUT ISINK = 15 mA, Output = ON IOUT = 3 mA, TA = 25°C Output = ON, VOUT = 12 V Output = OFF, VOUT = VCC(Max) 10/90% points; RLOAD = 500 Ω, CLOAD = 10 pF, TA = 25°C 10/90% points; RLOAD = 500 Ω, CLOAD = 10 pF, TA = 25°C Over tooth HT device option Over valley LT device option Over tooth Over valley – 30 35 – – – – – – – 200 – 57 – 0.9 0.5 HIGH LOW LOW HIGH 450 – 90 10 5 5 – – – – mV V mA μA μs μs V V V V tPO Gear Speed < 100 rpm; VCC > VCC(Min) – – 500 μs Symbol VCC VCCUV VZSupply IZSupply ICC IRCC Test Conditions Operating; TJ < TJ(Max) ICC = ICC(Max) + 3 mA, TA = 25°C VSupply = 27 V Output = OFF or ON VRCC = –18 V Min. 3.3 – 28 – 3 – Typ.1 – – 31 – 6.5 –5 Max. 26.5