Intelligent Pressure Sensor Signal Conditioner Chip

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IDT introduced an energy-efficient 24-bit sensor signal conditioner (SSC) IC designed for consumer barometric pressure and thermopile sensors. With an integrated 26-bit digital signal processor (DSP) for linearization and calibration functions, the ZSSC3224 is optimised for high-resolution consumer, industrial, white goods and medical applications, and mobile products such as phones and tablets.

The new sensor interface features both accuracy and high resolution with high-accuracy amplification and a 24-bit precision ADC. The 24-bit output is ideal for precision measurement systems including barometric altitude measurement for portable navigation or emergency call systems, altitude measurement for car navigation, pressure measurements inside hard disks, and weather forecasting equipment.

Important features of the ZSSC3224 include a quadratic form factor optimised for stacked die assembly, operating temperature range of -40°C to 85°C, easy programming via software provided in evaluation kit, accuracy better than +0.10% full-scale output, internal temperature measurement and signal processing and fully corrected digital output signal simplifying the system design.

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“We designed the ZSSC3224 to provide our customers with the high resolution and miniaturized form factor needed for their next-generation products. The device is designed for use with resistive pressure sensors as well as absolute voltage sensors such as thermopiles. A stacked die assembly, combined with a dedicated MEMS sensor element, can provide the lowest form factor on the market for MEMS based sensors”, said Michael Georgi, product marketing manager at IDT.

Featuring an intelligent power-save scheme, the ZSSC3224 can target battery-driven, low-power devices acheiving 1 mA typical overall current consumption, ultra-low 20 nA typical sleep mode current, and a 1.68V to 3.6V power supply range. The device also offers internal filter options for low noise output signals and intelligent alarm and interrupt capabilities.

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The device provides a superior power supply rejection ratio (PSRR) of up to 90dB at 2 V ideal for applications in harsh environments. Digital compensation of signal offset, sensitivity, temperature and non-linearity is accomplished via an internal correction algorithm with coefficients stored on-chip in a highly reliable, nonvolatile, programmable memory.

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