ASAIR AHT10 - User Manual

AHT10
Technical Manual
ASAIR®
Temperature and humidity sensor
• Fully calibrated
• Digital output, I
2
C interface
• Excellent long-term stability
• SMD package reflow solderable
• Fast response and strong anti-interference ability
Application range
HVAC, dehumidifiers, testing and testing equipment, consumer goods, automobiles, automatic control, data logger,
weather home appliances, humidity regulation, medical and other related temperature and humidity detection and
control.
1- ADR
2- SDA
3- SCL
4- VDD
5- GND
6- NC
Figure 1: AHT10 sensor package diagram (unit: mm tolerance: 0.1mm)
Product overview
AHT10, the new generation of temperature and humidity
sensors sets a new standard in size and intelligence: it is
embedded for reflow soldering
The dual-row flat leadless SMD package has
a 4x5mm bottom and a height of 1.6mm. The sensor
outputs a calibrated digital signal in standard I2C format.
The AHT10 is equipped with a newly designed
ASIC- specific chip, an improved MEMS semiconductor
capacitive humidity sensing element and a standard on-
chip temperature sensing element. Its performance has
been greatly improved beyond the reliability level of the
previous generation of sensors. The first generation of
temperature and humidity sensors have been improved to
make them more stable in harsh environments.
Each sensor is calibrated and tested with a product
lot number printed on the surface of the
product. Thanks to improved and miniaturized
sensors, it is more cost-effective and ultimately all
equipment will benefit from cutting-edge energy-
saving operating modes.
6
2
5
3
4
1
0.8
0.8
4.0
5.0
1.27
1.0
AHT10
1.6
2.7
ASAIR
XXXXXX
®

Summary

Sensor Performance

Relative Humidity Performance

Details resolution, accuracy, repeatability, hysteresis, nonlinearity, response, and drift for relative humidity.

Temperature Performance

Details resolution, accuracy, repeatability, hysteresis, response, and drift for temperature measurement.

Electrical Characteristics

Supply Voltage and Current

Specifies supply voltage range, typical supply current in measuring and sleep modes, and power consumption.

Communication Interface

Defines the communication protocol used by the sensor, which is a two-wire digital I2C interface.

Packaging Information

Sensor Packaging Details

Describes the sensor model, package type (Tape and Reel), and quantity per volume (4000PCS).

User Guide: Working Conditions & Electricals

Operating Conditions and Stability

Discusses sensor performance within recommended ranges and long-term exposure effects on drift.

Humidity Accuracy Across Temperatures

Presents a chart showing maximum humidity error at various temperatures, indicating typical and maximum deviations.

Power Consumption and Voltage Effects

Explains power consumption based on temperature and supply voltage, referencing graphs for current vs. voltage.

Application Information

Welding and Soldering Instructions

Provides detailed guidance on SMD pad design, stencil, solder mask, and reflow soldering processes.

Storage and Handling Precautions

Covers humidity sensitivity (MSL 1), storage conditions, and protection against chemical vapors and static discharge.

Recovery and Temperature Effects

Details recovery processing steps for drift and explains temperature's impact on humidity readings.

Sealing, Packaging Materials, and Wiring

Discusses material selection for sealing, potential contamination, and signal integrity rules for wiring.

Interface Definition

Pinout and Power Supply

Defines pin assignments, power supply range (1.8-3.6V), and recommends a decoupling capacitor.

Serial Clock (SCL) and Data (SDA) Signals

Explains the role of SCL for synchronization and SDA for data transfer in the I2C interface.

Absolute Maximum Ratings

Lists stress ratings for voltage and current, indicating conditions under which functional operation is not advised.

Input;Output Characteristics

I2 C Timing Characteristics

Details timing parameters for I2C communication in fast and high-speed modes, including clock frequency and signal widths.

Sensor Communication Protocol

Outlines the I2C communication process, including start sensor, start/stop timing, and commands.

Signal Conversion

Relative Humidity Calculation

Provides the formula for calculating relative humidity (%RH) from the sensor's SDA output signal.

Temperature Calculation

Provides the formula for calculating temperature (°C) from the sensor's ST output signal.

Environmental Stability Considerations

Advises on ensuring consistent conditions for measurement and testing, noting performance guarantees.

Package and Tracking

Sensor Tracking Information

Describes laser marking on sensor surfaces and label placement on reels for tracking purposes.

Transport Packaging Details

Outlines tape and reel packaging, ESD bag sealing, standard package size, and reel dimensions.

Precautions and Quality Assurance

Personal Injury Warnings

Warns against using the product in safety-critical applications and emphasizes following instructions to prevent injury.

ESD Protection Measures

Highlights the component's sensitivity to static electricity and the need for antistatic measures during application.

Warranty and Product Liability

Details the 12-month warranty, return conditions, and clarifies company responsibility for product defects and applications.

ASAIR AHT10 Specifications

General

Accuracy (Temperature)	±0.3°C
Accuracy (Humidity)	±2% RH
Humidity Range	0% to 100% RH
Resolution (Temperature)	0.01°C
Resolution (Humidity)	0.024% RH
Interface	I2C
Temperature Range	-40°C to +85°C