Allegro Microsystems has introduced two 0° to 360° angle sensor ICs that provide contactless high-resolution angular position information based on magnetic Circular Vertical Hall (CVH) technology. Allegro’s angle sensors utilise a single channel phase methodology to calculate angle measurements resulting to higher accuracy, faster refresh rates, and more air gap independence than competitive angle sensor ICs.

Allegro’s A1337 and A1338 devices have a system-on-chip (SoC) architecture that includes a CVH front end, digital signal processing, and digital SPI, SENT and PWM outputs. They also include on-chip EEPROM technology, capable of supporting up to 100 read/write cycles, for flexible end-of-line programming of calibration parameters. A1337 is ideal for automotive applications requiring 0° to 360° angle measurements, such as electronic power steering (EPS), seatbelt motor position systems, rotary PRNDLs and throttle systems.

 
Allegro A1337 product image (cr) Figure 1: Allegro's A1337 angle sensor IC that provide contactless high-resolution angular position information based on magnetic CVH technology.  

The A1337 device was designed with safety-critical application requirements in mind. It includes user-controlled, on-chip logic built-in self-test (L-BIST) and full signal path diagnostics. The device also includes integrated Turns Counter and Low-Power Mode functions. The Low-Power Mode enables the device to be connected directly to the vehicle battery and minimises power consumption when the vehicle is in the key-off state. Its user-programmable duty cycle optimises low-power mode current consumption (typically 85 µA per die). The Turns Counter function allows the device to keep track of either 45° or 180° turns of the motor when the part is in Low-Power Mode, allowing it to keep track of the motor position even when the vehicle is in the key-off state.

 
Allegro A1337 functional block diagram (cr) Figure 2: The Allegro A1337 angle sensor IC includes integrated Turns Counter and Low-Power Mode functions.  

 
Allegro A1337 Typical Application (cr) Figure 3: The A1337 device is designed with safety-critical application requirements in mind.  

The Allegro A1337 angular position sensor features a WAKE pin for external wake-up trigger that can be used to automatically detect motion >100rpm.

The A1337 supports a Low RPM mode for slower rate applications and a High RPM mode for high-speed applications. High RPM mode is for applications that require higher refresh rates to minimise error due to latency. Low RPM mode is for applications that require higher resolution operating at lower angular velocities.

The A1337 is available in a single-die 14-pin TSSOP and a dual-die 24-pin TSSOP; and both packages are lead (Pb) free with 100% matte tin leadframe plating.

 
Allegro A1337 packages (cr) Figure 4: The A1337 single- and dual-die packages  

 
Allegro specs table (cr) Figure 5: A1337 Part Number Specifications and Availability  

 
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