Chip adds precision altitude sensing to mobiles
The ZSSC3016 is a sensor signal conditioner (SSC) integrated circuit for high-accuracy amplification and analog-to-digital conversion of a differential input signal. Designed for high resolution altimeter module applications, the ZSSC3016 can perform offset, span, and 1st and 2nd order temperature compensation of the measured signal. Developed for correction of resistive bridge sensors, it can also provide a corrected temperature output measured with an internal sensor.
The measured and corrected bridge values are provided at the digital output pins, which can be configured as I2C* (≤ 3.4MHz) or SPI (≤ 20MHz). Digital compensation of signal offset, sensitivity, temperature, and non)linearity is accomplished via an 18-bit internal digital signal processor (DSP) running a correction algorithm. Calibration coefficients are stored on-chip in a highly reliable, nonvolatile, multiple-time programmable (MTP) memory. Programming the ZSSC3016 is simple via the serial interface and the PC-controlled calibration software provided in the ZMDI Development Kit. The interface is used for the PC-controlled calibration procedure, which programs the set of calibration coefficients in memory. The digital mating is fast and precise, eliminating the overhead normally associated with trimming external components and multipass calibration routines.
- Flexible, programmable analog front-end design; up to 16-bit scalable, charge-balancing two-segment analog-to-digital converter (ADC)
- Fully programmable gain amplifier accepting sensors from 14 to 72 (linear factor)
- Internal auto-compensated temperature sensor
- Digital compensation of individual sensor offset; 1st and 2nd order digital compensation of sensor gain
- Digital compensation of 1st and 2nd order temperature gain and offset drift
- Intelligent power management unit
- Layout customized for die-die bonding with sensor for high-density chip-on-board assembly
- Typical sensor elements can achieve accuracy of less than ±0.10% FSO @ -40 to 85 °C
ZMD has introduced a 16-bit sensor signal conditioning IC for calibrated resistive sensor modules.
Designed for altimeter module applications in mobile phones, sport watches or outdoor GPS tracking systems, the ZSSC3016 allows an altitude resolution of less than 15cm at sea level.
“It is accurate enough for barometric altitude measurement for portable navigation or emergency call systems, altitude measurement for car navigation, inside hard disk pressure measurement, and weather forecasting equipment,” said the supplier.
The ZSSC3016 combines an amplifier, 16-bit analogue-to-digital conversion and an 18-bit DSP with calibration functions.
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The device has an internal sensor supply regulator with an excellent power supply rejection ratio (PSRR) eliminating the need of an external buffer cap and making it suitable for mobile phones or other transmitters which are creating battery voltage dumps during operation.
The ZSSC3016 operates at a temperature range of -40°C to +85°C. Accuracy is less than ±0.10% FSO over the full temperature range.
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