====== lamaPLC: XGZP68xx: Silicon Pressure Sensors/Module ======
{{ :sensor:xgzp6847a_1.png?120|XGZP6847A}}
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.|
^[[#xgzp6847|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|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 ====
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{{ :sensor:xgzp6847d_1.png |}}

**XGZP6847D**

{{ :sensor:xgzp6847a_1.png?120|XGZP6847A}}
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.

{{page>:tarhal}}

==== XGZP6897D: specialized differential pressure sensor ====
{{anchor:xgzp6897d}}
{{ :sensor:xgzp6897d_1.png?120|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.

===== I²C topics on lamaPLC =====
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{{tag>communication i2c sensor modul pressure CFSensor XGZP68xx XGZP6810D XGZP6857D XGZP6859D XGZP6887D XGZP6897D XGZP6899A piezoresistive capacitive}}
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