AM2320 Digital Temperature And Humidity Sensor

AM2320 Digital Temperature And Humidity Sensor offers a highly accurate and reliable solution for environmental monitoring, integrating both a capacitive humidity sensor and a high-precision temperature sensor onto a single chip. This advanced sensor features standard single-bus (DHT-like) and I²C communication modes, giving developers consequently greater flexibility when they interface it with microcontrollers like Arduino, Raspberry Pi, or ESP32. The AM2320 generates a calibrated digital signal output, eliminating the need for complex analog-to-digital conversion and external components. Furthermore, its small size, low power consumption, and excellent long-term stability make it an ideal choice for integrating into a wide range of smart devices and climate control systems. Therefore, designers frequently select the AM2320 for critical applications that demand consistent and accurate environmental data.

Key Features:

• High Accuracy and Resolution: Delivers precise measurements with excellent resolution across its entire operating range.
• Digital Output: Outputs calibrated digital data, simplifying the interfacing process and reducing system cost.
• Dual Communication Modes: Supports both single-bus (simplified serial) protocol and standard I²C protocol, offering versatility for different host controllers.
• Low Power Consumption: Features an extremely low current draw, which makes it perfect for battery-powered or energy-efficient devices.
• Excellent Stability: Boasts long-term stability and high reliability, ensuring consistent performance over the product’s lifespan.
• Fast Response Time: Provides rapid measurement updates, allowing systems to react quickly to changes in ambient conditions.

Technical Specifications:

• Supply Voltage (V_DD): DC 3.1 V – 5.5 V
• Humidity Range: 0% RH – 99.9% RH
• Humidity Accuracy: ±3% RH (Typ.)
• Temperature Range: −40°C – +80°C
• Temperature Accuracy: ±0.5°C (Typ.)
• Resolution: 0.1 (Humidity: % RH, Temperature: °C)
• Current Consumption (Measuring): Typ. 3.3 mA
• Current Consumption (Standby): Typ. 80 μA

Mechanical Specifications:

• Package Type: 4-Pin Plastic Shell (Cylindrical)
• Sensor Element: Polymer Capacitive (Humidity), Thermistor (Temperature)
• Protection: Dust and moisture resistant coating on the sensing head.
• Lead Style: Straight through-hole leads or integrated cable connections.

Dimensions:

• Body Diameter: ≈ 14 mm
• Body Height: ≈ 8.0 mm (Excluding cable/leads)
• Pin Pitch: 2.54 mm (Standard header pitch, if mounted on a small PCB breakout)
• Total Weight: ≈ 1.0 g (Extremely light for portable applications)

Pinout and Wiring:

• Pin 1 (VCC): Connect to the power supply (3.1V to 5.5V DC).
• Pin 2 (SDA/DATA): This bi-directional pin handles data transmission. Therefore, connect it to the microcontroller’s SDA (I²C) or a digital I/O pin (Single-bus). Requires a pull-up resistor to VCC.
• Pin 3 (GND): Connect to the system ground (0V).
• Pin 4 (SCL/NC): Connect to the microcontroller’s SCL pin when using I²C mode; leave unconnected (NC) when using single-bus mode.
• Wiring Note: Always use a pull-up resistor (typically 4.7 kΩ to 10 kΩ) on the SDA/DATA line for reliable communication in either mode.

Datasheet Reference:

• Download Aosong AM2320 Digital Sensor Datasheet

Commonly Used in:

• IoT and Smart Home Devices: Monitoring climate conditions for smart thermostats and HVAC control.
• Weather Stations: Providing accurate local temperature and relative humidity readings.
• Data Loggers: Recording long-term environmental metrics for research and industrial auditing.

Applications:

• HVAC System Control: Helping maintain optimal air quality and comfort in commercial and residential buildings.
• Agricultural Monitoring: Measuring greenhouse climate to optimize plant growth and prevent disease.
• Product Storage Control: Monitoring temperature and humidity in server rooms, cold chains, and material storage facilities.
• Medical Devices: Used in incubators and various health-related climate control systems.

Equivalent Models:

• DHT22/AM2302: A popular predecessor, however, the AM2320 offers superior accuracy and the added flexibility of the I²C interface.
• SHT20/SHT30 (Sensirion): These advanced sensors provide high precision and digital output, often serving as a higher-end alternative in professional applications.
• Si7021 (Silicon Labs): Another digital I²C option offering comparable accuracy, consequently making it a strong functional cross-reference.

Package Includes:

• 1 x AM2320 Digital Temperature and Humidity Sensor Module