Product Overview
The FHTC3 is a miniature, ultra-low power temperature and humidity sensor IC designed for consumer electronics applications. It integrates a complete sensing system on a single chip, including capacitive humidity sensing, PN junction temperature measurement, a 16-bit ADC, digital signal processing, calibration data storage, and an I2C digital communication interface. Its compact DFN6 package (2x2x0.75mm) makes it ideal for space-constrained designs. The FHTC3 offers wide supply voltage (1.6V-5.5V) and measurement ranges, factory calibration, and reflow solderability, making it suitable for applications like cold chain transportation, smart homes, smart agriculture, and communication equipment.
Product Attributes
- Brand: Nyfea
- Part Number: FHTC3
- Package: DFN6 (2x2x0.75mm)
- Calibration: Factory calibrated
- Solderability: Reflow solderable
- Packaging: Tape and reel
Technical Specifications
| Parameter | Condition | Value | Unit | Comments |
| Sensor Performance | ||||
| Humidity Accuracy | Typ. | 3.0 | %RH | Max. See Figure 3 |
| Humidity Resolution | - | 0.01 | %RH | - |
| Humidity Hysteresis | - | 1.0 | %RH | - |
| Humidity Specified Range | - | 0-100 | %RH | - |
| Humidity Response Time | 63% | 8 | s | - |
| Humidity Long-term drift | Typ. | <0.5 | %RH/y | - |
| Temperature Accuracy | Typ. | 0.3 | Max. See Figure 5 | |
| Temperature Resolution | - | 0.01 | - | |
| Temperature Hysteresis | - | 1.0 | - | |
| Temperature Specified Range | - | -45 to +130 | - | |
| Temperature Response Time | 63% | < 5-30 | s | - |
| Temperature Long-term drift | Typ. | <0.02 | C /y | - |
| Electrical Characteristic Parameters (@25, 3.3V) | ||||
| Supply voltage | VDD | 1.6 - 5.5 | V | - |
| Power-up level | VPOR | 1.3 - 1.5 | V | Static power supply |
| Supply current (Idle state) | IDD | 45 - 80 | A | After power-up, sensor remains in idle state unless a sleep or measurement command is sent |
| Supply current (Sleep mode) | IDD | 0.2 - 0.3 | A | Requires a wake-up command |
| Supply current (Measurement Normal) | IDD | 500 - 860 | A | Average current consumption while measuring |
| Supply current (Measurement Low power) | IDD | 320 - 620 | A | Average current consumption while measuring |
| Average current consumption (continuous operation, 1 measurement/sec) | IDD | 3 | A | Normal |
| Average current consumption (continuous operation, 1 measurement/sec) | IDD | 1 | A | Low power |
| Absolute Maximum Ratings | ||||
| Supply voltage | - | -0.3 to +6 | V | - |
| Operating temperature range | - | -45 to 130 | - | |
| Storage temperature range | - | -45 to 130 | - | |
| ESD HBM (human body mode) | - | -4 to +4 | kV | - |
| ESD CDM (charge device mode) | - | -500 to +500 | V | - |
| Latch up, JESD78 Class , 125C | - | -100 to +100 | mA | - |
| Sensor System Timings (@ 25, 3.3V) | ||||
| Power-up time | tPU | 180 - 500 | s | After hard reset, VDD > VPOR |
| Soft reset time | tSR | 180 - 500 | s | After soft reset ACK, sensor enters idle state |
| Measurement duration (Normal) | tMEAS | 10 - 11 | ms | Humidity and temperature measurement |
| Measurement duration (Low power) | tMEAS | 1.5 - 2 | ms | Humidity and temperature measurement |
| Communication Timings (@ 25, 3.3V) | ||||
| SCL clock frequency (Normal) | fSCL | 0 - 100 | KHz | - |
| SCL clock frequency (Low Power) | fSCL | 0 - 1000 | KHz | - |
| Hold time START condition | tHD;STA | 4.0 | us | Normal mode |
| Hold time START condition | tHD;STA | 0.6 | us | Low Power mode |
| Low period of SCL clock | tLOW | 4.5 | us | Normal mode |
| Low period of SCL clock | tLOW | 0.5 | us | Low Power mode |
| High period of SCL clock | tHIGH | 4.0 | us | Normal mode |
| High period of SCL clock | tHIGH | 0.26 | us | Low Power mode |
| Set-up time for repeated START condition | tSU;STA | 4.7 | us | Normal mode |
| Set-up time for repeated START condition | tSU;STA | 0.5 | us | Low Power mode |
| SDA hold time | tHD;DAT | 0 | us | - |
| SDA set-up time | tSU;DAT | 250 | ns | Normal mode |
| SDA set-up time | tSU;DAT | 50 | ns | Low Power mode |
| SCL/SDA rise time | tR | 1000 | ns | Normal mode |
| SCL/SDA rise time | tR | 120 | ns | Low Power mode |
| SCL/SDA fall time | tF | 300 | ns | Normal mode |
| SCL/SDA fall time | tF | 120 | ns | Low Power mode |
| SDA valid time | tVD:DAT | 3.5 | us | Normal mode |
| SDA valid time | tVD:DAT | 0.5 | us | Low Power mode |
| Set-up time for STOP condition | tSU:STO | 4 | us | Normal mode |
| Set-up time for STOP condition | tSU:STO | 0.26 | us | Low Power mode |
| Capacitive load on bus line | CB | 500 | pF | Normal mode |
| Capacitive load on bus line | CB | 400 | pF | Low Power mode |
2509101515_Nyfea-FHTC3-TR_C51901044.pdf
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