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
For more product information, please contact us.
Thank you for your inquiry.
Please provide the following information and we will contact you as soon as possible, thank you.
