RAK WisDuo Series User manual

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RAK3400 LoRa Module
WisDuo Series
Version V1.0 | December 2020
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Table of Contents
1 Introduction .........................................................3
2 Overview ..............................................................3
2.1 General description .............................................................................................3
2.2 Main Features ......................................................................................................3
2.3 Block Diagram ......................................................................................................4
2.4 Pin Assignment .....................................................................................................5
2.5 Pin Description .....................................................................................................6
2.6 Power Consumption ............................................................................................7
2.7 Absolute Maximum Ratings ................................................................................7
2.8 Recommended operating conditions ...................................................................8
3 Mechanical Dimensions ......................................9
3.1 Top and Side Dimensions ....................................................................................9
3.2 Recommended Footprint ....................................................................................9
4 Recommended Reflow Profile ..........................10

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1 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.
2 Overview
2.1 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 IoT field.
2.2 Main Features
□ Compact Form Factor: 15 x 23 x 3 mm
□ 44 Pin Stamp Pad for PCB SMT mounting
□ I/O ports: UART/I2C/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)
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2.3 Block Diagram
The following figure shows a block diagram of RAK3400.
Figure 1: Block Diagram

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2.4 Pin Assignment
The following figure shows the pin assignment of RAK3400 module.
Figure 2: Pin Assignment
□ NOTES
□ 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.

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2.5 Pin Description
The following tables show the pin definition and description of RAK3400.
Table 2: Definition of I/O Parameters
T y p e D e s c r i p t i on
PI Power Input
PO Power Output
DI Digital Input
DO Digital Output
IO Bidirectional
AI Analog Input
AO Analog Output
Table 3: Pin Description
P o w e r S upp l y
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
I 2 C I n t e r f a c e
Pin Name
Pin No.
Type
Description
Comment
I2C1_SDA
4
IO
I2C serial data
P0.13
I2C1_SCL
5
OD
I2C serial clock
P0.14
I2C2_SDA
23
IO
I2C serial data
P0.24
I2C2_SCL
24
OD
I2C serial clock
P0.25
U S B I n t e r f a c e
Pin Name
Pin No.
Type
Description
Comment
VBUS
1
PI
USB power
5V input for 3.3V regulator
USB_DP
3
IO
USB differential data(+)
USB_DM
2
IO
USB differential data(-)
U AR T I n t e r f a c e
Pin Name
Pin No.
Type
Description
Comment
UART1_TX
10
DO
UART1 transmit
P0.20
UART1_RX
9
DI
UART1 receive
P0.19
UART1_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_CLK
29
DO
SPI clock
P0.03
SPI_CS
34
DO
SPI chip select
P0.26
SPI_DIO0
33
IO
SPI data input/output 0
P0.30
SPI_DIO1
32
IO
SPI data input/output 1
P0.29
SPI_DIO2
31
IO
SPI data input/output 2
P0.28
SPI_DIO3
30
IO
SPI data input/output 3
P0.02
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SWD Interface
Pin Name
Pin No.
Type
Description
Comment
SWDIO
19
Debug
SWD I/O for debug and
programming
SWCLK
18
Debug
SWD clock input for debug
and programming
RESET
Pin Name
Pin No.
Type
Description
Comment
RESET
17
DI
Reset the module
NFCInterface
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
IO
Bluetooth antenna
interface
50Ω Impedance
If unused, keep this pin open
GPIO Interface
Pin Name
Pin No.
Type
Description
Comment
GPIO P1.01
25
IO
General-purpose
input/output
GPIO P1.02
26
IO
General-purpose
input/output
GPIO P1.03
27
IO
General-purpose
input/output
GPIO P1.04
28
IO
General-purpose
input/output
ADC Interface
Pin Name
Pin No.
Type
Description
Comment
GPIO P0.31 / AIN7
39
IO / AI
General-purpose IO /
General purpose ADC
interface
GPIO P0.05 / AIN3
40
IO / AI
General-purpose IO /
General purpose ADC
interface
GPIO P0.04 / AIN7
41
IO / AI
General-purpose IO /
General purpose ADC
interface
2.6 Power Consumption
The following table show the power consumption.
Table 4: Power Consumption
Item
P owe r C o n s u m p t io n
C o nd i t io n
Tx mode BT@4dBm
9mA
BT Tx mode
Rx mode BT@2Mbps
11.5mA
BT Rx mode
Sleep mode
2.0uA
BT sleep
2.7 Absolute Maximum Ratings
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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
2.8 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

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3 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.
3.1 Top and Side Dimensions
The following figure shows the mechanical dimension of the RAK3400 module.
Figure 3: Top and Side Dimensions
3.2 Recommended Footprint
The following figure shows the recommended footprint of the RAK3400 module.
Figure 4: Recommended Footprint (Unit: mm)
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4 Recommended Reflow Profile
The following figure shows the Recommended Reflow Soldering Thermal Profile of RAK3400.
Figure 5: Recommended Reflow Soldering Thermal Profile
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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 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.
Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation est
autorisée aux deux conditions suivantes : (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit accepter
tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement.
:
This equipment complies with Industry Canada radiation exposure limits set forth for an uncontrolled environment.
Cet équipement est conforme à l'exposition aux rayonnements Industry Canada limites établies pour un environnement non contrôlé.
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.
— Le présent émetteur radio [25908-RAK3400] a été approuvé par Innovation, Sciences et Développement économique Canada pour
fonctionner avec les types d'antenne énumérés cidessous et ayant un gain admissible maximal. Les types d'antenne non inclus dans
cette liste, et dont le gain est supérieur au gain maximal indiqué pour tout type figurant sur la liste, sont trictement interdits pour
l'exploitation de l'émetteur.
Antenna info
Antenna type: IPEX Antenna
Manufacturer: Shenzhen RAKwireless Technology Co., Ltd.
Model name: 501-0132-X1
Antenna gain: 1.68dBi