Product Parameters

​​Input Voltage​​: 4.5V - 36V DC (wide voltage compatibility, built-in 3.3V LDO regulator)

​​Core Chip Voltage​​: 1.08V - 3.6V DC

​​Temperature Range​​: -40°C to +125°C | Resolution: 0.01°C

​​Humidity Range​​: 0% to 100% RH | Resolution: 0.01% RH

​​Typical Accuracy​​: Temperature ±0.2°C (0°C to 65°C) | Humidity ±1.8% RH (20% to 80% RH)

​​Communication​​: I²C digital interface (default address 0x44, optional 0x45)

​​Power Consumption​​: Operating current 0.4μA (1Hz measurement rate, average) | Standby current 80nA (sleep mode)

​​Response Time​​: Humidity 6 seconds (τ63%) | Temperature

​​Package​​: DFN-4 metal shell (1.5mm × 1.5mm × 0.5mm, anti-electromagnetic interference)

​​Operating Setting​​: -40°C to +125°C (Reliable) | Humidity 0-100% RH (non-condensing)

Main Pin Functions

​​VIN​​: DC input positive (4.5V-36V DC, connect to power supply positive, parallel 100nF decoupling capacitor required)

​​GND​​: Power ground

​​SCL​​: I²C clock line (requires external 4.7kΩ pull-up resistor to 3.3V)

​​SDA​​: I²C data line (bidirectional, requires external 4.7kΩ pull-up resistor to 3.3V)

FAQ
​​Q1: No response in I²C communication?​​

A: Confirm address: default 0x44 (marked "BD1B" indicates 0x45). Ensure external 4.7kΩ pull-up resistors on SCL/SDA (no onboard pull-up) .

​​Q2: Humidity readings drift?​​

A: Trigger self-calibration with command 0x3041 (every 30 days). Avoid AC vents/breathing airflow; activate heater (command 0x30A2) to disperse condensation .