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lamaPLC: XGZP68xx: Silicon Pressure Sensors/Module
The CFSensor XGZP68xx series features high-performance silicon pressure sensors combined with an ASIC for calibration and temperature compensation.
Silicon pressure sensors typically use one of two main methods:
Piezoresistive: Resistors are placed on a thin silicon diaphragm. When pressure bends the diaphragm, the resistance changes, which is measured as a voltage.
Capacitive: Pressure changes the distance between two plates (one of which is a silicon diaphragm), altering the electrical capacitance.
The table below compares several well-known sensor types, which can be found on aliexpress.com or amazon.de:
| Sensor Type | Communication | Operating Range | Performance (Range/Type) | Efficiency | Special Properties |
|---|---|---|---|---|---|
| XGZP6810D | Digital I²C | 3.0V – 5.5V | ±125Pa / ±500Pa (Differential) | High-speed sampling | Ultra-sensitive; alternative to Sensirion SDP810. |
| XGZP6847D | Digital I²C | 2.5V – 5.5V | -100kPa to 1500kPa (Gage) | ~5uA sleep current | DIP6 package; widely used for blood pressure and appliances. |
| XGZP6857D | Digital I²C | 3.3V or 5.0V | 0–10kPa to 1000kPa (Gage) | Low power consumption | SOP6 package; compact footprint for consumer electronics. |
| XGZP6859D | Digital I²C | 2.5V – 5.5V | 0 to 200kPa (Vacuum/Gage) | Stable ratiometric output | Features a barb inlet pipe for secure tubing connections. |
| XGZP6887D | Digital I²C | 3.3V or 5.0V | -100kPa to 1000kPa (Gage) | Calibrated /Compensated | J-lead SOP8 package; high reliability for industrial sensors. |
| XGZP6897D | Digital I²C | 3.3V or 5V | -100kPa to 200kPa (Differential) | Optimized for I2C bus | Dual-port layout for measuring air flow or filter drop. |
| XGZP6899A | Analog | 5V (Standard) | -100kPa to 700kPa (Differential) | Ratiometric (VCC dependent) | Provides calibrated analog signal for simple A/D inputs. |
Key Selection Guide
- For Arduino/ESP32: Stick to the “D” models (Digital I²C) to avoid external ADC calibration and reduce wiring.
- For Ultra-Low Pressure: Use the XGZP6810D for sensitive tasks like HVAC air flow or medical ventilators.
- For Liquid/Vacuum: The XGZP6859D is specifically designed for vacuum detection with a barb inlet.
- Analog Preference: If your system lacks I2C, the XGZP6899A is the analog version of the 6899D.
Note: Always check the voltage suffix (e.g., 33 for 3.3V or 50 for 5.0V) to match your microcontroller logic levels.
XGZP6847: Fully calibrated silicon pressure sensor module
XGZP6847D
The XGZP6847D is a fully calibrated silicon pressure sensor module designed for air and non-corrosive gases. It combines a MEMS pressure die with an integrated ASIC to provide direct digital readings via I²C, eliminating the need for complex external amplification or calibration.
Technical Specifications
- Pressure Range: Covers a vast span from -100kPa to 1500kPa (model-specific).
- Accuracy: Typically ±2% FSS (Full Scale Span) for ranges between 10kPa and 200kPa, and ±2.5% FSS for other ranges.
- Resolution: 21-bit for pressure and 16-bit for temperature readings.
- Power Supply: Operates between 2.5V and 5.5V DC, with a default test voltage of 3.3V.
- Current Consumption: Very low, typically around 1.8mA during active measurement and as low as 100nA in standby.
- Temperature Compensation: Calibrated for accurate performance between 0°C and +60°C.
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XGZP6897D: specialized differential pressure sensor
The XGZP6897D is a specialized differential pressure sensor designed to measure the difference between two air sources. It is widely used in airflow systems (such as Pitot tubes), HVAC filters, and medical ventilators.
Core Technical Specifications
- Pressure Type: Differential (compares pressure between two ports).
- Pressure Range: Extremely flexible, from ±0.5kPa up to ±200kPa.
- Output: 24-bit Digital (I²C interface) for pressure; 16-bit for temperature.
- Accuracy: Typically ±2% Span (for ranges >10kPa) or ±2.5% Span (for ranges <10kPa).
- Power Supply: Flexible 2.5V to 5.5V DC range.
- Media: Non-corrosive gases or dry air only.
- Response Time: Standard 20ms (10% to 90% step change).
- Default Slave Address: 0x6D
Pinout
- Pin 2: GND (Ground)
- Pin 3: SDA (I2C Data)
- Pin 4: SCL (I2C Clock)
- Pin 6: VDD (Power)
- Note: Other pins (1, 5, 7, 8) are usually NC (No Connection) or factory-specific.
- Capacitor: A 100nF decoupling capacitor between VDD and GND is required for stable readings.
Port Usage
- P1 (High Port): Connect to the higher pressure source.
- P2 (Low Port): Connect to the lower pressure source or leave open for Gage measurements.
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