RAK1901 WisBlock Temperature and Humidity Sensor Datasheet
Overview
Figure 1: RAK1901 WisBlock SensorDescription
RAK1901 is a WisBlock Sensor that extends the WisBlock system with a Sensirion SHTC3 temperature and humidity sensor. A ready-to-use SW library and tutorial make it easy to build up an environmental temperature and humidity data acquisition system.
Features
- Temperature sensor accuracy: ±0.2° C
- Temperature range: -40° C to +125° C
- Humidity sensor accuracy:±2.0% RH
- Humidity range:0 to 100%
- Voltage Supply: 3.3 V
- Current Consumption: 0.3 uA to 270 uA
- Chipset: Sensirion SHTC3
- Module size: 10 x 10 mm
Specifications
Overview
Mounting
Figure 2 shows the mounting mechanism of the RAK1901 module on a WisBlock Base board. The RAK1901 module can be mounted on the slots: A, B, C, D, E, & F.
Figure 2: RAK1901 WisBlock Sensor MountingHardware
The hardware specification is categorized into six parts. It shows the chipset of the module and discusses the pinouts, sensors, and the corresponding functions and diagrams. It also covers the electrical and mechanical parameters that include the tabular data of the functionalities and standard values of the RAK1901 WisBlock Temperature and Humidity Sensor.
Chipset
| Vendor | Part number |
|---|---|
| Sensirion | SHTC3 |
Pin Definition
The RAK1901 WisBlock Temperature and Humidity Sensor comprises a standard WisBlock connector. The WisBlock connector allows the RAK1901 module to be mounted to a WisBlock Base board. The pin order of the connector and the pinout definition is shown in Figure 3.
Figure 3: RAK1901 WisBlock Sensor Pinout DiagramOnly the I2C related pins, VDD and GND are connected to this module.
If a 24-pin WisBlock Sensor connector is used, the IO used for the output pulse depends on what slot the module is plugged in. The following table shows the default IO used for different slots:
| SLOT A | SLOTB | SLOT C | SLOT D | SLOT E | SLOT F |
|---|---|---|---|---|---|
| WB_IO1 | WB_IO2 | WB_IO3 | WB_IO5 | WB_IO4 | WB_IO6 |
Sensors
Temperature Sensor
| Parameter | Conditions | Value | Units |
|---|---|---|---|
| Accuracy Tolerance | Typ. | ±0.2 | °C |
| Repeatability | - | 0.1 | °C |
| Resolution | - | 0.01 | °C |
| Specified Range | - | -40 to +125 | °C |
| Response Time | τ 63% | <5 to 30 | s |
| Long-term Drift | Typ. | <0.2 | °C/y |
Humidity Sensor
| Parameter | Conditions | Value | Units |
|---|---|---|---|
| Accuracy Tolerance | Typ. | ±0.2 | %RH |
| Repeatability | - | 0.1 | %RH |
| Resolution | - | 0.01 | %RH |
| Hysteresis | - | ±1 | %RH |
| Specified Range | extended | 0 to 100 | %RH |
| Response Time | τ 63% | 8 | s |
| Long-term Drift | Typ. | <0.25 | %RH/y |
Electrical Characteristics
Recommended Operating Conditions
| Symbol | Description | Min | Nom. | Max | Unit |
|---|---|---|---|---|---|
| VDD | Power supply for the module | 1.6 | 3.3 | 3.6 | V |
| Isleep | Sleep current | - | 0.3 | - | uA |
| IDD | Measure current (normal mode) | - | 430 | uA | |
| IDD | Measure current (low-power mode) | - | 270 | - | uA |
Mechanical Characteristics
Board Dimensions
Figure 4 shows the dimensions and the mechanic drawing of the RAK1901 module.
Figure 4: RAK1901 WisBlock Sensor Mechanic DrawingWisConnector PCB Layout
Figure 5: WisConnector PCB footprint and recommendationsSchematic Diagram
Figure 5 shows the schematic of the RAK1901 module.
Figure 6: RAK1901 WisBlock Sensor schematics
