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Pressure Sensor Interface Signal Conditioning Chip Compatible with Analog and Digital Output
The NSA2302 is a highly integrated, low-cost, high-precision interface chip designed for bridge sensors to collect, amplify and calibrate sensor signals. The NSA2302 integrates a low-noise gauge amplifier (PGA), a low-power 24-bit Σ-Δ ADC, a DSP for digital calibration, and a 12-bit DAC. The NSA2302 supports second-order temperature drift calibration for sensor zero temperature, sensitivity and up to third-order nonlinear calibration, with digital calibration accuracy up to 0.1%. The calibration logic is based on the calibration parameters stored in the internal EEPROM and calculated by the built-in DSP. The NSA2302 also supports direct high-voltage supply applications with an internal JFET controller. The NSA2302 supports both I2C/SPI digital output and analog output, and supports one-wire interface (OWI) multiplexing analog pins for post-sensor calibration.
Product Features
• Integrated bridge drive, high precision PGA, 24-bit high precision ADC, supporting proportional measurement, strain gauge type or resistance bridge sensor input
• Support sensor diagnosis and output clamp function
• Excellent noise performance: 600nV@OSR = 1024X, Gain = 32X (equivalent to input noise) Calibration accuracy: 0.05% FSO (support second order temperature coefficient and third order nonlinear calibration)
• High-precision internal temperature sensor, (absolute accuracy < 0.5℃, resolution < 0.01℃); support a variety of external temperature sensors (diode, two-terminal thermistor, three terminal thermistor, etc.)
• VDD supports 3V to 5.5V power supply and external high-voltage power supply through JFET controller
• Support sleep working mode to greatly reduce MCU load. The static current under sleep is at 200nA level at room temperature, and supports Power Down of external bridge power supply.
• Support SPI BUS or I2C digital interface output, with analog proportional output
Application
• Automobile additional pressure sensor (A/C pressure sensor/TMAP sensor）
• Consumer/industrial pressure sensor modules (washing machine level/pressure cooker/coffee machine/soybean milk machine, etc.)
Functional Block Diagram
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