Nyfea FHT31-TR integrated sensor featuring temperature compensated humidity measurement and wide voltage range
Product Overview
The FHT31 is a next-generation single-chip integrated temperature and humidity sensor developed by NYFEA. It features a fully calibrated, linearized, and temperature-compensated digital output with a wide supply voltage range (2.0 V to 5.5 V) and a high-speed I2C interface (up to 1 MHz) with two user-selectable addresses. Designed with a miniaturized DFN package (2.5 x 2.5 x 0.9 mm), it offers high reliability, long-term stability, and typical accuracy of 2%RH / 0.2C. Its integrated 16-bit high-precision ADC allows for measurement times as low as 2.5ms. The sensor is ideal for applications requiring precise environmental monitoring, including communication equipment, photovoltaic energy storage, consumer electronics, cold chain transportation, smart home systems, and smart agriculture.
Product Attributes
- Brand: Nyfea
- Origin: Not specified
- Material: Not specified
- Color: Not specified
- Certifications: Not specified
Technical Specifications
| Parameter | Condition | Min | Typ | Max | Unit | Comments |
| Electrical Specifications | ||||||
| Supply voltage | 2.0 | 3.3 | 5.5 | V | ||
| Power-up/down | VPOR | 1.8 | 1.9 | 2.0 | V | |
| Slew rate change of the supply voltage | VDD, slew | 20 | V/ms | Changes in supply voltage should be less than the maximum slew rate, changing too fast may lead to reset. | ||
| Supply current (Idle state, single shot mode) | T=25C | 0.2 | 2.0 | A | Current when sensor is not performing a measurement during single shot mode. | |
| Supply current (Idle state, single shot mode) | T=125C | - | 6.0 | A | Current when sensor is not performing a measurement during periodic data acquisition mode. | |
| Supply current (Idle state, periodic data acquisition mode) | T=125C | 45 | - | A | Current when temperature and humidity conversion is not turned on in periodic data acquisition mode. | |
| Supply current (Measuring) | 600 | 1500 | A | Current consumption while sensor is measuring. | ||
| Supply current (Average) | (one measurement per second at lowest repeatability, single shot mode) | 1.7 | - | A | Average consumption. | |
| Alert output driving strength | IOH | 1.5x VDD | mA | |||
| Heater power | Heater running | 3.6 | 33 | mW | Depending on the supply voltage. | |
| Timing Specification | ||||||
| Power-up time | VDDVPOR | 0.5 | 1 | ms | Time between VDD reaching VPOR and sensor entering idle state. | |
| Soft reset time | Start from the soft reset signal | 0.5 | 1.5 | ms | Time between ACK of soft reset command and sensor entering idle state. | |
| Duration of reset pulse | tRESETN | 1 | - | - | s | |
| Measurement duration (Low repeatability) | tMEAS, l | 2.5 | 4 | ms | Three repeatability modes differ with respect to duration, noise level and consumption. | |
| Measurement duration (Medium repeatability) | tMEAS,m | 4.5 | 6 | ms | Three repeatability modes differ with respect to duration, noise level and consumption. | |
| Measurement duration (High repeatability) | tMEAS,h | 12.5 | 15.5 | ms | Three repeatability modes differ with respect to duration, noise level and consumption. | |
| Absolute Minimum and Maximum Ratings | ||||||
| Supply voltage | VDD | -0.3 | 6 | V | Voltage values are only applied for short time periods. | |
| Max voltage on pins (SDA, ADDR, ALERT, SCL, nRESET) | -0.3 | VDD+0.3 | V | |||
| Max input current on any pin | 100 | mA | ||||
| Operating temperature range | -45 | 130 | ||||
| Storage temperature range | -45 | 150 | ||||
| ESD (HBM) | 8 | kV | ||||
| ESD (CDM) | 850 | V | ||||
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