New Cost-Effective Pressure Sensing Solution with Multiple Analog and Digital Functions to Reduce Design Time of HVAC Systems

Renesas Electronics Corporation has introduced the RAA2S425x Family of ICs for automotive pressure sensing systems. The RAA2S425x Product Family features high integration and advanced digital and analog functionality that significantly ease the design cycle and reduce customers' system BOM and production costs. These new devices provide highly accurate amplification and sensor-specific correction of signals in automotive xEV/EV/FCEV pressure sensing braking, transmission, and HVAC systems. Moreover, these new ICs offer extended analog sensor offset compensation (XSOC), are adjustable to nearly all resistive bridges, and deliver pressure and temperature readings with high accuracy (0.35% - 1.0%) over a wide temperature range (-40°C to 150°C).

The RAA2S425x communicates digitally with calibration equipment, reducing noise sensitivity and this digital calibration enables customers to keep assembly costs low since it doesn't require trimming of sensing elements. These ICs integrate a 16-bit embedded RISC microcontroller that provides digital compensation of offset, sensitivity, temperature drift, nonlinearity and has highly-reliable non-volatile memory (NVM) to store calibration coefficients and configuration data in harsh automotive environments. 

Additionally, RAA2S425x is an optimal solution for safety and harsh automotive applications with integration of overvoltage and reverse-polarity protection circuitry, ASIL-B compliance according to ISO26262, excellent electromagnetic compatibility, and multiple superior diagnostic features.

Features

• Capable of measuring one full resistive bridge sensor signals

• Temperature measurement using external diode/PTC/TCR or internal (PTAT) sensor

• Large sensor offset correction using analog offset compensation and digital zooming with up to 18-bit resolution

• Higher digital resolution, fast OUR output update rate by ADC & sharp roll-off by digital LPF

• Ability to cover large sensor span & high accuracy (0.35% - 1.0%) over the entire temp. range (-40°C to 150°C)

• Qualified according to AEC-Q100 Grade 0

• Optimized for harsh automotive environment

• Over-voltage and reverse polarity protection ±40V, robust EMC performance, and multiple diagnostic features

• Minimal EOL (end-of-line) production costs during mass production

• QFN-24 as package option

• Analog output

Applications

• Pressure sensing in braking, transmission and HVAC applications

• xEV

• Plug-in hybrid electric vehicle (PHEV)

• Battery electric vehicle (BEV)

• Fuel-cell electric vehicle (FCEV)

Availability

The RAA2S425x devices are now available in 4mm x 4mm QFN-24 packages with wettable flanks.