RAKwireless RAK3400 Bluetooth LoRa Module User Guide
Introduction
This document defines RAK3400 module and describes hardware interface which are connected with customers applications.
This document helps customers quickly understand the interface specifications, electrical and mechanical details, as well as other related information of RAK3400
Overview
General description
RAK3400 is an BLE5.0 wireless communication module, it includes an nRF52840, Ultra-low power consumption of 2.0uA in sleep mode, and BLE output power up to 4dBm.
The module supports BLE 5.0. Its RF communication capabilities make it suitable for a variety of applications in the loT field
Main Features
- Compact Form Factor: 15 x 23 x 3 mm
- 44 Pin Stamp Pad for PCB SMT mounting
- I/O ports: UART/12C/GPIO/USB/SPI (optional NFC interface)
- Temperature range: -40°C to +85°C
- Supply voltage: 2.0~3.6V
- Ultra-Low Power Consumption 2.0uA in sleep mode
- BLE5.0 (Tx power -20 to +4 dBm in 4dB steps)
- For single 3.3V power supply, connect VBAT_NRF, VDD_NRF, together with 3.3V power
- For 3.6V li-SOCL2 battery or 4.2V li-MnO2 battery, connect VBAT_NRF with battery output, VDD_NRF can use to indicate IO voltage level. Please don’t power any chip with VDD_NRF.
- GND pins should be connected to ground in the design.
- VBAT_SX, VBAT_SX_IO is reserved, they are not connected to any chips in RAK3400 module.
Pin Description
The following tables show the pin definition and description of RAK3400.
Table 2: Definition of I/O Parameters
| Type | Description |
| PI | Power Input |
| PO | Power Output |
| DI | Digital Input |
| DO | Digital Output |
| 10 | Bidirectional |
| Al | Analog Input |
| AO | Analog Output |
Table 3: Pin Description
| Power Supply | ||||
| Pin Name | Pin No. | Type | Description | Comment |
| VDD_NRF | 43 | PI | Power supply | |
| VBAT_NRF | 44 | Pi | High Power supply | |
| GND | 14,16, 22,35, 36,38, 42 | Ground | ||
| I2C Interface | ||||
| Pin Name | Pin No. | Type | Description | Comment |
| I2C1 SDA | 4 | 10 | 12C serial data | P0.13 |
| 12C1_SCL | 5 | OD | 12C serial clock | P0.14 |
| I2C2_SDA | 23 | 10 | 12C serial data | P0.24 |
| 12C2_SCL | 24 | OD | 12C serial clock | P0.25 |
| USB Interface | ||||
| Pin Name | Pin No. | Type | Description | Comment |
| VBUS | 1 | PI | USB power | 5V input for 3.3V regulator |
| USB DP | 3 | 10 | USB differential clatal+) | |
| USB DM | 2 | 10 | USB differential data(-) | |
| UART Interface | ||||
| Pin Name | Pin No. | Type | Description | Comment |
| UART1_TX | 10 | DO | UART1 transmit | P0.20 |
| UARTl_RX | 9 | DI | UART1 receive | P0.19 |
| UARTl_DE | 11 | DI | UART1 detect | P0.21 |
| UART2 TX | 7 | DO | UART2 transmit | P0.16 |
| UART2_RX | 6 | DI | UART2 receive | P0.15 |
| uART2_DE | 8 | DI | UART2 detect | P0.17 |
| Quad SPI Interface | ||||
| Pin Name | Pin No. | Type | Description | Comment |
| SPI_CLIC | 29 | DO | SPI clock | P0.03 |
| SPI CS | 34 | DO | SPI chip select | P0.26 |
| SPI _D100 | 33 | 10 | SPI data input/output 0 | P0.30 |
| SPI _D101 | 32 | 10 | SPI data input/output 1 | P0.29 |
| SPI D102 | 31 | 10 | SPI data input/output 2 | P0.28 |
| SPI 0103 | 30 | 10 | SP’ data input/output 3 | P0.02 |
| Pin Name | Pin No. | Tvpe | Description | Comment | |
| SWDIO | 19 | Debug | SWD I/O for debug and programming | ||
| SWCLK | 18 | Debug | SWD clock input for debug and programming | ||
| RESET | M | ||||
| Pin Name | Pin No. | Type | Description | Comment | |
| RESET | 17 | DI | Reset the module | ||
| NFC Interface | |||||
| Pin Name | Pin No. | Type | Description | Comment | |
| NFC1 | 13 | DI | NFC input 1 | P0.09 | |
| NFC2 | 12 | DI | NFC input 2 | P0.10 | |
| Antenna Interface | |||||
| Pin Name | Pin No. | Type | Description | Comment | |
| RF_BT | 15 | 10 | 8luetooth antenna interface | 500 ImpedanceIf unused, keep this pin open | |
| GPIO Interface | |||||
| Pin Name | Pin No. | Type | Description | Comment | |
| GPIO P1.01 | 25 | 10 | General-purpose input/output | ||
| GPIO P1.02 | 26 | 10 | General-purpose input/output | ||
| GPIO P1.03 | 27 | 10 | General-purpose input/output | ||
| GPIO P1.04 | 28 | 10 | General-purpose input/output | ||
| ADC Interface =— | |||||
| Pin Name | Pin No. | Type | Description | Comment | |
| GPIO P0.31 / AIN7 | 39 | 10 / AI | General-purpose 10/ General purpose ADC interface | ||
| GPIO P0.05 / AIN3 | 40 | 10 / Al | General-purpose 10 / General purpose ADC interface | ||
| GPIO P0.04 / A1N7 | 41 | 10/A1 | General-purpose 10 / General purpose ADC interface | ||
Power Consumption
The following table show the power consumption.
Table 4: Power Consumption
| Item | Power Consumption | Condition |
| Tx mode BT@4dBm | 9mA | BT Tx mode |
| Rx mode BT@2Mbps | 11.5mA | BT Rx mode |
| Sleep mode | 2.0uA | BT sleep |
Absolute Maximum Ratings
The following table show the absolute maximum ratings of RAK3400
Table 5: Absolute Maximum Ratings
| Symbol | Description | Min. | Nom. | Max. | Unit |
| VDD_NRF | MCU power supply | -0.3 | – | 3.9 | V |
| VBUS | USB supply voltage | -0.3 | – | 5.8 | V |
| VBAT_NRF | MCU high voltage power supply | -0.3 | – | 5.8 | V |
| ESD HBM | Human Body Model | 2000 | V | ||
| ESD CDM | Charged Device Model | 500 | V |
Recommended operating conditions
The following table shows the recommended operating conditions of RAK3400.
Table 6: Recommended operating conditions
| Symbol | Description | Min | Nom. | Max | Unit |
| VDD_NRF | NRF52840 power supply | 2.0 | 3.3 | 3.6 | V |
| VBUS | VBUS USB supply voltage | 4.35 | 5.0 | 5.5 | V |
| VBAT NRF | NRF52840 high voltage power supply | 2.5 | 5.5 | V |
Mechanical Dimensions
This chapter describes the mechanical dimensions of the module. All dimensions are measured in millimeter (mm), and the dimensions tolerances are ±0.05mm unless otherwise specified.
Top and Side Dimensions
The following figure shows the mechanical dimension of the RAK3400 module.
Figure 3: Top and Side Dimensions
Recommended Footprint
The following figure shows the recommended footprint of the RAK3400 module.
Figure 4: Recommended Footprint (Unit: mm)
Recommended Reflow Profile
The following figure shows the Recommended Reflow Soldering Thermal Profile of RAK3400.
Figure 5: Recommended Reflow Soldering Thermal Profile
Statement
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
FCC Caution:
Changes or modifications not expressly approved by the part responsible for compliance could void the user’s authority to operate the equipment. This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment.
FCC RF Radiation Exposure Statement:
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with a minimum distance of 20cm between the radiator and any part of your body
FCC Statement:
“This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.”
IC statement:
This device complies with Industry Canada licence-exempt RSS standard(s).
Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device.
This equipment complies with IC RSS-102 radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with a minimum distance of 20cm between the radiator and any part of your body.
This equipment complies with Industry Canada radiation exposure limits set forth for an uncontrolled environment.
The proposed FCC IC label format is to be placed on the module. If it is not visible when the module is installed into the system,
“Contains FCC ID: 2AF6B-RAK3400, Contains IC: 25908-RAK3400″ shall be placed on the outside of final host system.
Labelling
This radio transmitter [25908-RAK3400] has been approved by Innovation, Science and Economic Development Canada to operate with the antenna types listed below, with the maximum permissible gain indicated. Antenna types not included in this list that have a gain greater than the maximum gain indicated for any type listed are strictly prohibited for use with this device.
Antenna info
Antenna type: IPEX Antenna
Manufacturer: Shenzhen RAKwireless Technology Co., Ltd.
Model name: 501-0132-X1
Antenna gain: 1.68dBi
Antenna type: PIFA Antenna
Manufacturer: HL GLOBA HL L
Model name: SA06LWEG01R Model A
Antenna gain: 3.4dBi 
Documents / Resources
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RAKwireless RAK3400 Bluetooth LoRa Module [pdf] User Guide RAK3400, RAK3400 Bluetooth LoRa Module, Bluetooth LoRa Module, LoRa Module, Module |
