Monday, April 12, 2021
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Excessive Accuracy And Output Flexibility With Sensor Interface IC

Delivers quick, dependable and versatile output with sign conditioning algorithms for automotive and industrial stress sensing functions

Constructed on many years of automotive sensor experience, the A17700, an automotive-grade interface IC for resistive bridge stress sensors characteristic top-of-the-line sign conditioning algorithms and delivers premium efficiency with elevated system effectivity and versatile interface choices – all in a small kind issue. 

Options embody:

  • Versatile compensation algorithms for accuracy over temperature and sensing bridge variation.
  • Exact stress info supply in low delay analogue, PWM, or SENT outputs.
  • Automotive AEC-Q100 Grade 0 qualification and EMC robustness with minimised exterior parts.
  • A set of superior built-in system diagnostics.

The A17700 is configurable for resistive bridge stress sensors in a variety of essential functions in at this time’s effectively designed automobiles; from high-pressure programs like dynamic brake programs (DBS) in turbo and hybrid electrical automobiles (HEV) or gasoline direct injection (GDI) to medium and low-pressure programs comparable to brake boosters, HVAC functions for electrified automobiles and computerized transmission oil administration.

Excessive accuracy output  

With its best-in-class built-in polynomial algorithm, the A17700 interface sensor affords excessive accuracy overpressure and temperature by way of two-stage processing of a stress sign. This versatile compensation delivers excessive accuracy in resistive membranes requiring both excessive or low-point characterisation throughout meeting.

Placing a steadiness extremely desired by system designers, this gadget affords methods to enhance system output and keep flexibility. With sturdy EMC efficiency – as much as 4kV HBM – the A17700 additionally allows as much as 30% fewer exterior parts for a smaller whole answer footprint, smaller PCB, and extra cost-efficient system design.

“The A17700 permits system designers to simply choose the optimum algorithm and I/O choices that finest match their system necessities, balancing accuracy and end-of-line check instances, thereby optimising the system value,” explains Haeyoung Choi, Product Supervisor for Sensor Interface ICs at Allegro. “With its small footprint and versatile compensation, the A17700 is the perfect answer for functions the place area and effectivity matter, like in at this time’s electrical and hybrid electrical automobiles.”

Quick output response 

With parallel processing paths for enter and temperature, the A17700 can obtain the smallest chip delay in the marketplace. With an input-to-output processing delay of 100 μs, this ultra-fast interface sensing IC permits programs to compensate for vibration results on the membrane with no output decision loss, additional rising system constancy.

“This quick gadget response time allows sooner output sampling that permits undesired membrane oscillations to be filtered by the system,” provides Choi. “This enhanced potential to report the oscillations will affirm that the suitable filtering is utilized and supply clients trusted reliability and efficiency.”

Security-critical system diagnostics

Environmental circumstances, comparable to a change in provide voltage stage, temperature, enter bridge sign and connection, could cause non permanent faults in stress sensing programs. The A17700 captures these adjustments and alerts them within the output protocol, enabling fault filtering on the system stage for extra correct security notifications. 

The A17700 is offered from Allegro MicroSystems in a small form-factor 24-pin 4 mm × 4 mm QFN bundle with wettable flanks – very best for making certain dependable soldering and visible inspection of solder joints.

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