MICROCHIP RNWF02PC Module
Introduction
The RNWF02 Add On Board is an efficient, low-cost development platform to evaluate and demonstrate the features and functionalities of Microchip’s low-power Wi-Fi® RNWF02PC module. It can be used with a Host PC via USB Type-C® without the need of an additional hardware accessory. This is compliant to the mikroBUS™ Standard. The add-on board can be plugged easily on the host board and can be controlled by the host Microcontroller Unit (MCU) with AT commands through UART.
The RNWF02 Add On Board offers
- An easy-to-use platform to speed up design concepts to revenue with the low-power Wi-Fi RNWF02PC module:
- Host PC via USB Type-C interface
- Host board supporting mikroBUS socket
- RNWF02PC module, which includes a crypto device for a secure and authenticated cloud connection
- RNWF02PC module mounted on the RNWF02 Add On Board as a pre-programmed device
Features
- RNWF02PC Low-Power 2.4 GHz IEEE® 802.11b/g/n-compliant Wi-Fi® Module
- Powered at 3.3V Supply Either by USB Type-C® (Derived Default 3.3V Supply from Host PC) or by Host Board Using mikroBUS Interface
- Easy and Fast Evaluation with On-Board USB-to-UART Serial Converter in PC Companion Mode
- Host Companion Mode Using mikroBUS Socket
- Exposes Microchip Trust&Go CryptoAuthentication™ IC Through mikroBUS Interface for Secure Applications
- LED for Power Status Indication
- Hardware Support for 3-Wire PTA Interface to Support Bluetooth® Co-Existence
Quick References
Reference Documentation
- MCP1727 1.5A, Low Voltage, Low Quiescent Current LDO Regulator Data Sheet (DS21999)
- mikroBUS Specification (www.mikroe.com/mikrobus)
- MCP2200 USB 2.0 to UART Protocol Converter with GPIO (DS20002228)
- RNFW02 Wi-Fi Module Data Sheet (DS70005544)
Hardware Prerequisites
- RNWF02 Add On Board(2) (EV72E72A)
- USB Type-C® compliant cable(1,2)
- SQI™ SUPERFLASH® KIT 1(2a) (AC243009)
- For 8-bit host MCU
- For 32-bit host MCU
- SAM E54 Xplained Pro Evaluation Kit(2) (ATSAME54-XPRO)
- mikroBUS™ Xplained Pro(2) (ATMBUSADAPTER-XPRO)
Notes
- For PC Companion mode
- For host Companion mode
- OTA demo
Software Prerequisites
- MPLAB® Integrated Development Environment (MPLAB X IDE) tool(2)
- MPLAB XC Compilers (MPLAB XC Compilers)(2)
- Python (Python 3.x(1))
Notes
- For PC Companion mode Out-of-Box (OOB) demo
- For host Companion mode development
Acronyms and Abbreviations
Table 1-1. Acronyms and Abbreviations
| Acronyms and Abbreviations | Description |
| BOM | Bill of Material |
| DFU | Device Firmware Update |
| DPS | Device Provisioning Service |
| GPIO | General Purpose Input Output |
| I2C | Inter-Integrated Circuit |
| IRQ | Interrupt Request |
| LDO | Low-Dropout |
| LED | Light Emitting Diode |
| MCU | Microcontroller Unit |
| NC | Not Connected |
| ………..continued | |
| Acronyms and Abbreviations | Description |
| OOB | Out of the Box |
| OSC | Oscillator |
| PTA | Packet Traffic Arbitration |
| PWM | Pulse Width Modulation |
| RTCC | Real Time Clock and Calendar |
| RX | Receiver |
| SCL | Serial Clock |
| SDA | Serial Data |
| SMD | Surface Mount |
| SPI | Serial Peripheral Interface |
| TX | Transmitter |
| UART | Universal Asynchronous Receiver-Transmitter |
| USB | Universal Serial Bus |
Kit Overview
The RNWF02 Add On Board is a plug-in board containing the low-power RNWF02PC module. The signals required for control interface are connected to the on-board connectors of the Add On Board for flexibility and rapid prototyping.
Figure 2-1. RNWF02 Add On Board (EV72E72A) – Top View
Figure 2-2. RNWF02 Add On Board (EV72E72A) – Bottom View 
Kit Contents
The EV72E72A (RNWF02 Add On Board) kit contains the RNWF02 Add On Board mounted with the RNWF02PC module.
Note: If any of the above items are missing in the kit, go to support.microchip.com or contact your local Microchip Sales office. In this user guide, there is a list of Microchip offices for sales and services provided on the last page.
Hardware
This section describes the hardware features of the RNWF02 Add On Board.
Figure 3-1. RNWF02 Add On Board Block Diagram 
Notes
- Using Microchip’s total system solution, which includes complementary devices, software drivers, and reference designs, is highly recommended to ensure the proven performance of the RNWF02 Add On Board. For more details, go to support.microchip.com or contact your local Microchip Sales office.
- PTA functionality is not supported while using the RTCC Oscillator.
- It is recommended to connect this pin with the Tri-State pin on the host board.
Table 3-1. Microchip Components Used in the RNWF02 Add-On Board
| S.No. | Designator | Manufacturer Part Number | Description |
| 1 | U200 | MCP1727T-ADJE/MF | MCHP Analog LDO 0.8V-5V MCP1727T-ADJE/MF DFN-8 |
| 2 | U201 | MCP2200-I/MQ | MCHP Interface USB UART MCP2200-I/MQ QFN-20 |
| 3 | U202 | RNWF02PC-I | MCHP RF Wi-Fi® 802.11 b/g/n RNWF02PC-I |
Power Supply
The RNWF02 Add On Board can be powered using any of the following sources, depending on the use case scenario, but the default supply is from the host PC using a USB Type-C® cable:
- USB Type-C supply – Jumper (JP200) is connected between J201-1 and J201-2. – The USB supplies 5V to Low-Dropout (LDO) MCP1727 (U200) to generate 3.3V supply for the VDD supply pin of RNWF02PC module.
- Host board 3.3V supply – Jumper (JP200) is connected between J201-3 and J201-2.
- The host board supplies 3.3V power through the mikroBUS header to the VDD supply pin of the RNWF02PC module.
- (Optional) Host board 5V supply – There is a provision to supply 5V from the host board with rework (populate R244 and depopulate R243). Do not mount the jumper (JP200) on J201 when the host board 5V supply is used.
- The host board provides 5V supply through the mikroBUS header to the LDO regulator (MCP1727) (U200) to generate 3.3V supply for VDD supply pin of the RNWF02PC module.
Note: The VDDIO is shorted with the VDD supply of the RNWF02PC module. Table 3-2. Jumper JP200 Position on J201 Header for the Power Supply Selection
| 3.3V Generated from USB Power Supply (Default) | 3.3V from mikroBUS Interface |
| JP200 on J201-1 and J201-2 | JP200 on J201-3 and J201-2 |
The following figure illustrates the power supply sources used to power the RNWF02 Add On Board.
Figure 3-2. Power Supply Block Diagram
Notes
- Remove the supply selection jumper (JP200) present on the supply selection header (J201), then connect an ammeter between J201-2 and J201-3 for external supply current measurement.
- Remove the supply selection jumper (JP200) present on the supply selection header (J201), then connect an ammeter between J201-2 and J201-1 for USB Type-C supply current measurement.
Voltage Regulators (U200)
An onboard voltage regulator (MCP1727) generates 3.3V. This is used only when the Host board or the USB supplies 5V to the RNWF02 Add On Board.
- U200 – Generates 3.3V that powers the RNWF02PC module along with the associated circuits For more details on MCP1727 voltage regulators, refer to the MCP17271.5A, Low Voltage, Low Quiescent Current LDO Regulator Data Sheet (DS21999).
Firmware Update
The RNWF02PC module comes with pre-programmed firmware. Microchip periodically releases firmware to fix reported issues or to implement the latest feature support. There are two ways to perform regular firmware updates:
- Serial DFU command-based update over UART
- Host-assisted Over-the-Air (OTA) update
Note: For serial DFU and OTA programming guidance, refer to the RNWF02 Application Developer’s Guide.
Mode of Operation
The RNWF02 Add On Board supports two modes of operation:
- PC Companion mode – Using a host PC with on-board MCP2200 USB-to-UART converter
- Host Companion mode – Using a host MCU board with mikroBUS socket via mikroBUS interface
Host PC with On-Board MCP2200 USB-to-UART Converter (PC Companion Mode)
The simplest method for using the RNWF02 Add On Board is to connect it to a host PC that supports USB CDC virtual COM (serial) ports using the on-board MCP2200 USB-to-UART converter. The user can send ASCII commands to the RNWF02PC module using a terminal emulator application. In this case, the PC acts as the host device. The MCP2200 is configured in the Reset condition until the USB supply is plugged in.
Use the following serial terminal settings
- Baud rate: 230400
- No flow control
- Data: 8 bits
- No parity
- Stop: 1 bit
Note: Press the ENTER button in the terminal for command execution.
Table 3-3. RNWF02PC Module Connection to MCP2200 USB-to-UART Converter
| Pin on MCP2200 | Pin on RNWF02PC Module | Description |
| TX | Pin19, UART1_RX | RNWF02PC module UART1 receive |
| RX | Pin14, UART1_TX | RNWF02PC module UART1 transmit |
|
RTS |
Pin16, UART1_CTS |
RNWF02PC module UART1 Clear- to- Send (active-low) |
|
CTS |
Pin15, UART1_ RTS |
RNWF02PC module UART1 Request- to- Send (active-low) |
| GP0 | — | — |
| GP1 | — | — |
| GP2 |
Pin4, MCLR |
RNWF02PC module Reset (active-low) |
| GP3 | Pin11, Reserved | Reserved |
| GP4 |
Pin13, IRQ/INTOUT |
Interrupt request (active-low) from the RNWF02PC module |
| GP5 | — | — |
| GP6 | — | — |
| GP7 | — | — |
Host MCU Board with mikroBUS™ Socket via mikroBUS Interface (Host Companion Mode)
The RNWF02 Add On Board can also be used with the host MCU boards using mikroBUS sockets with the control interface. The following table shows how the pinout on the RNWF02 Add On Board mikroBUS interface corresponds to the pinout on the RNWF02PC module.
Note: Disconnect the USB Type-C® cable in the host Companion mode.
Table 3-4. mikroBUS Socket Pinout Details (J204)
| Pin Number J204 | Pin on mikroBUS™ Header | Pin Description of mikroBUS Header | Pin on RNWF02PC Module(1) |
| Pin1 | AN | Analog input | — |
| Pin2 |
RST |
Reset |
Pin4, MCLR |
| Pin3 | CS | SPI Chip Select |
Pin16, UART1_CTS |
| ………..continued | |||
| Pin Number J204 | Pin on mikroBUS™ Header | Pin Description of mikroBUS Header | Pin on RNWF02PC Module(1) |
| Pin4 | SCK | SPI Clock | — |
| Pin5 | MISO | SPI host input client output | — |
| Pin6 | MOSI | SPI host output client input |
Pin15, UART1_RTS |
| Pin7 | +3.3V | 3.3V power | +3.3V from host MCU socket |
| Pin8 | GND | Ground | GND |
Table 3-5. mikroBUS Socket Pinout Details (J205)
| Pin Number J205 | Pin on mikroBUS™ Header | Pin Description of mikroBUS Header | Pin on RNWF02PC Module(1) |
| Pin1(3) | PWM | PWM output | Pin11, Reserved |
| Pin2 | INT | Hardware interrupt |
Pin13, IRQ/INTOUT |
| Pin3 | TX | UART transmit | Pin14, UART1_TX |
| Pin4 | RX | UART receive | Pin19, UART1_RX |
| Pin5 | SCL | I2C Clock | Pin2, I2C_SCL |
| Pin6 | SDA | I2C Data | Pin3, I2C_SDA |
| Pin7 | +5V | 5V power | NC |
| Pin8 | GND | Ground | GND |
Notes:
- For more details on the RNWF02PC module pins, refer to the RNWF02 Wi-Fi® Module Data Sheet (DS70005544).
- The RNWF02 Add On Board does not support the SPI interface, which is available on the mikroBUS interface.
- It is recommended to connect this pin with the Tri-State pin on the host board.
Debug UART (J208)
Use the debug UART2_Tx (J208) to monitor the debug logs from the RNWF02PC module. The user can use a USB-to-UART converter cable to print the debug logs.
Use the following serial terminal settings
- Baud rate: 460800
- No flow control
- Data: 8 bits
- No parity
- Stop: 1 bit
Note: UART2_Rx is not available.
PTA Interface (J203)
The PTA interface supports a shared antenna between Bluetooth® and Wi-Fi®. It has the hardware-based 802.15.2-compliant 3-wire PTA interface (J203) to address the Wi-Fi/Bluetooth co-existence.
Note: Refer to the software release notes for additional information.
Table 3-6. PTA Pin Configuration
| Header Pin | Pin on RNWF02PC Module | Pin Type | Description |
| Pin1 | Pin21, PTA_BT_ACTIVE/RTCC_OSC_IN | Input | Bluetooth® active |
| Pin2 | Pin6, PTA_BT_PRIORITY | Input | Bluetooth priority |
| Pin3 | Pin5, PTA_WLAN_ACTIVE | Output | WLAN active |
| ………..continued | |||
| Header Pin | Pin on RNWF02PC Module | Pin Type | Description |
| Pin4 | GND | Power | Ground |
LED
The RNWF02 Add On Board has one red (D204) Power-on status LED.
RTCC Oscillator (Optional)
The optional RTCC Oscillator (Y200) 32.768 kHz crystal is connected to the Pin22, RTCC_OSC_OUT and Pin21, RTCC_OSC_IN/PTA_BT_ACTIVE pins of the RNWF02PC module for the Real Time Clock and Calendar (RTCC) application. The RTCC Oscillator is populated; however, the corresponding resistor jumpers (R227) and (R226) are not populated.
Note: The PTA functionality is not supported while using the RTCC Oscillator. Refer to the software release notes for additional information.
Out of Box Demo
The RNWF02 Add On Board Out of Box (OOB) demo is based on a Python script that demonstrates MQTT cloud connectivity. The OOB demo uses the AT command interface, through the USB Type- C®, as per the PC Companion mode setup. The OOB demo connects to the MQTT server, and publishes and subscribes to predefined topics. For more details on MQTT cloud connectivity, go to test.mosquitto.org/. The demo supports the following connections:
- Port 1883 – unencrypted and unauthenticated
- Port 1884 – unencrypted and authenticated
The user can be connected to the MQTT server in seconds by providing Wi-Fi® credentials, username and password, depending on the connection type. For more information on the PC Companion mode OOB demo, go to GitHub – MicrochipTech/ RNWFxx_Python_OOB.
Appendix A: Reference Circuit
RNWF02 Add On Board Schematics
Figure 5-1. Supply Selection Header
- Figure 5-2. Voltage Regulator
- Figure 5-3. MCP2200 USB-to-UART Converter and Type-C USB Connector Section
- Figure 5-4. mikroBUS Header Section and PTA Header Section
- Figure 5-5. RNWF02PC Module Section
Appendix B: Regulatory Approval
This equipment (RNWF02 Add On Board/EV72E72A) is an evaluation kit and not a finished product. It is intended for laboratory evaluation purposes only. It is not directly marketed or sold to the general public through retail; it is only sold through authorized distributors or through Microchip. Using this requires significant engineering expertise to understand of the tools and relevant technology, which can be expected only from a person who is professionally trained in the technology. Regulatory compliance settings have to follow the RNWF02PC module certifications. The following regulatory notices are to cover the requirements under the regulatory approval.
United States
The RNWF02 Add On Board (EV72E72A) contains the RNWF02PC module, which has received Federal Communications Commission (FCC) CFR47 Telecommunications, Part 15 Subpart C “Intentional Radiators” single-modular approval in accordance with Part 15.212 Modular Transmitter approval.
Contains FCC ID: 2ADHKWIXCS02
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. Important: FCC Radiation Exposure Statement This equipment complies with FCC radiation exposure limits set forth for uncontrolled environments. The antenna(s) used for this transmitter must beinstalled to provide a separation distance of at least 8 cm from all persons and must not be co-located or operating in conjunction with any other antenna or transmitter. This transmitter is restricted for use with the specific antenna(s) tested in this application for certification.
RNWF02 Add On Board Bill of Materials
For the Bill of Materials (BOM) of the RNWF02 Add On Board, go to EV72E72A product web page.
Caution
Any changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate this equipment.
FCC STATENMENT
Note: 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.
Canada
The RNWF02 Add On Board (EV72E72A) contains the RNWF02PC module, which has been certified for use in Canada under Innovation, Science and Economic Development Canada (ISED, formerly Industry Canada) Radio Standards Procedure (RSP) RSP-100, Radio Standards Specification (RSS) RSS-Gen and RSS-247.
Contains IC: 20266-WIXCS02
This device contains license-exempt transmitter(s)/receiver(s) that comply with Innovation, Science and Economic Development Canada’s license-exempt RSS(s). Operation is subject to the following two conditions:
- This device may not cause interference;
- This device must accept any interference, including interference that may cause undesired operation of the device.
WARNING
This equipment complies with radio frequency exposure limits set forth by Innovation, Science and Economic Development Canada for an uncontrolled environment. This equipment should be installed and operated with a minimum distance of 20 cm between the device and the user or bystanders.
Europe
This equipment (EV72E72A) has been assessed under the Radio Equipment Directive (RED) for use in European Union countries. The product does not exceed the specified power ratings, antenna specifications and/or installation requirements as specified in the user manual. A Declaration of Conformity is issued for each of these standards and kept on file as described in the Radio Equipment Directive (RED).
Simplified EU Declaration of Conformity
Hereby, Microchip Technology Inc. declares that the radio equipment type [EV72E72A] is in compliance with Directive 2014/53/EU. The full text of the EU declaration of conformity is available at EV72E72A (See Conformity Documents)
Document Revision History
The document revision history describes the changes that were implemented in the document. The changes are listed by revision, starting with the most current publication.
Table 7-1. Document Revision History
| Revision | Date | Section | Description |
| C | 09/2024 | Hardware | • Updated “WAKE” to “Reserved” in the block diagram
• Added note for Reserved |
| Host PC with On-Board MCP2200 USB- to-UART Converter (PC Companion Mode) | For GP3 Pin, replaced “INT0/WAKE” by “Reserved” | ||
| Host MCU Board with mikroBUS Socket via mikroBUS Interface (Host Companion Mode) | For “mikroBUS Socket Pinout Details (J205)” Pin 1, replaced “INT0/WAKE” by “Reserved” and added note | ||
| RNWF02 Add On Board Schematics | Updated the schematic diagrams | ||
| B | 07/2024 | Features | Added power supply value as 3.3V |
| Hardware Prerequisites | Added:
• SQI™ SUPERFLASH® KIT 1 • AVR128DB48 Curiosity Nano • Curiosity Nano Base for Click boards • SAM E54 Xplained Pro Evaluation Kit • Mikrobus Xplained Pro |
||
| Kit Overview | Updated Add On Board top view and bottom view diagram | ||
| Kit Contents | Removed “RNWF02PC Module” | ||
| Hardware | Updated part number and description for “U202” | ||
| Power Supply | • Removed “VDD supply derives VDDIO supply to the RNWF02PC Module”.
• Added note • Updated the “Power Supply Block Diagram” |
||
| Host PC with On-Board MCP2200 USB- to-UART Converter (PC Companion Mode) | Added “Serial Terminal settings” | ||
| PTA Interface (J203) | Updated the description and notes | ||
| RTCC Oscillator (Optional) | Updated the notes | ||
| Out of Box Demo | Updated the description | ||
| RNWF02 Add On Board Schematics | Updated all the schematics diagram for this section | ||
| RNWF02 Add On Board Bill of Materials | Added new section along with official web page link | ||
| Appendix B: Regulatory Approval | Added new section with regulatory approval details | ||
| A | 11/2023 | Document | Initial revision |
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India – Bangalore
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Austria – Wels
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Frequently Asked Questions
Q: Where can I find more information on labeling and user information requirements?
A: Additional information can be found in KDB Publication 784748 available at the FCC Office of Engineering and Technology (OET) Laboratory Division Knowledge Database (KDB) apps.fcc.gov/oetcf/kdb/index.cfm.
Documents / Resources
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MICROCHIP RNWF02PC Module [pdf] Owner's Manual RNWF02PE, RNWF02UC, RNWF02UE, RNWF02PC Module, RNWF02PC, Module |