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

Constructed on a long time of automotive sensor experience, the A17700, an automotive-grade interface IC for resistive bridge strain 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 embrace:

  • Versatile compensation algorithms for accuracy over temperature and sensing bridge variation.
  • Exact strain 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 strain sensors in a variety of essential functions in as we speak’s effectively designed automobiles; from high-pressure techniques like dynamic brake techniques (DBS) in turbo and hybrid electrical automobiles (HEV) or gasoline direct injection (GDI) to medium and low-pressure techniques resembling 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 provides excessive accuracy overpressure and temperature by means of two-stage processing of a strain sign. This versatile compensation delivers excessive accuracy in resistive membranes requiring both excessive or low-point characterisation throughout meeting.

Hanging a steadiness extremely desired by system designers, this machine provides methods to enhance system output and keep flexibility. With strong EMC efficiency – as much as 4kV HBM – the A17700 additionally permits as much as 30% fewer exterior parts for a smaller complete resolution 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 greatest match their system necessities, balancing accuracy and end-of-line take a look at 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 resolution for functions the place area and effectivity matter, like in as we speak’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 techniques to compensate for vibration results on the membrane with no output decision loss, additional rising system constancy.

“This quick machine response time permits sooner output sampling that enables undesired membrane oscillations to be filtered by the system,” provides Choi. “This enhanced capacity to report the oscillations will verify that the suitable filtering is utilized and supply prospects trusted reliability and efficiency.”

Security-critical system diagnostics

Environmental situations, resembling a change in provide voltage stage, temperature, enter bridge sign and connection, could cause non permanent faults in strain sensing techniques. 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 on the market from Allegro MicroSystems in a small form-factor 24-pin 4 mm × 4 mm QFN package deal with wettable flanks – best for making certain dependable soldering and visible inspection of solder joints.