Allegro MicroSystems ATS627LSG High Accuracy Position Sensor ICs
Allegro MicroSystems ATS627LSG High Accuracy Position Sensor ICs are true zero-speed gear tooth sensor integrated circuits (ICs) consisting of an optimized Hall IC and a rare-earth pellet configuration in a single overmolded package. The ICs provide a manufacturer-friendly solution for digital gear tooth sensing applications. This small package can be easily assembled and used in conjunction with gears of various shapes and sizes. The low-jitter ATS627LSG is available in a lead (Pb)-free 4-pin SIP package (SG) with a 100% matte tin-plated leadframe.
The dual-element Hall IC switches in response to differential magnetic signals created by a ferrous target. Digital processing of the analog signal provides zero-speed performance independent of air gap, as well as dynamic adaptation of device performance to the typical operating conditions found in automotive applications.
High-resolution peak detecting Digital-to-Analog Converters (DACs) are used to set the adaptive switching thresholds of the device. Bounded tracking and switchpoint hysteresis reduce the negative effects of any anomalies in the magnetic signal associated with the targets used in many automotive applications. This Allegro MicroSystems sensor IC system is optimized for engine crank applications that use targets possessing signature regions.
Features
- Highly accurate in the presence of
- Anomalous target geometry (tooth-tooth variation)
- Signature teeth or valleys
- Target runout
- Highly repeatable output edges (low jitter)
- True zero-speed operation
- Undervoltage lockout
- Air gap independent switch points
- Defined power-on state
- High operating temperature
- Single-chip sensing IC for high reliability
- Enhanced quality through Scan Path and IDDQ measurement
- Enhanced EMC performance
- 4-pin SIP package
- Lead-free
Applications
- Crankshaft position sensing
- Camshaft position sensing
- Transmission speed sensing
- Wheel speed sensing (ABS systems)
- General gear tooth sensing
Specifications
- 4.0V to 24V supply voltage range, 26.5V maximum
- 26.5V maximum output off voltage
- -18V maximum reverse supply voltage
- -0.5V maximum reverse output voltage
- 25mA maximum output current
- 12mA maximum supply current, 7mA typical
- -10mA maximum reverse supply current
- 3.95V maximum undervoltage lockout, 3.6V typical
- 28V minimum supply zener clamp voltage
- 6V typical test pin zener clamp voltage
- Output stage
- Low 0mV to 450mV output voltage range
- 28V minimum output zener clamp voltage
- 10µA maximum output leakage current
- 25mA to 70mA output current limit range, 45mA typical
- 10µs typical output rise time
- 2µs maximum output fall time, 0.6µs typical
- ±60G allowable user-induced DAC offset
- 115mV typical running mode lockout enable
- 220mV typical running mode lockout release
- 60% typical operate point
- 40% typical release point
- 20kHz typical bandwidth
- 0rpm to 12,000rpm operational speed range
- Performance
- 30G to 1200G operational magnetic range
- 0.5mm to 3.0mm air gap range
- Maximum relative timing accuracy
- ±0.4° sequential mechanical rising edges
- ±0.4° sequential mechanical falling edges
- ±0.4° signature mechanical rising edge
- ±1.5° signature mechanical falling edge
- 0.08° maximum relative repeatability, sequential rising and falling edges
- 20µs typical output propagation delay
- Input magnetic characteristics
- Allowable differential sequential signal variation
- 0.5 minimum total variation over 60 cycles
- 0.6 minimum single cycle-to-cycle variation
- 0.8 to 1.6 allowable signature amplitude ratio, one instance per target revolution
- Allowable differential sequential signal variation
- -40°C to +150°C operating ambient temperature range
- +165°C maximum junction temperature
Functional Block Diagram
Application Circuit Diagram
Sensing
Related sensor ICs
Allegro MicroSystems Magnetic Speed Sensor ICs
A comprehensive portfolio covering the full range of speed and speed with direction sensor ICs.