MICROCHIP WILC3000 SD Wi-Fi Link Controller Secure Digital Card User Guide

MICROCHIP WILC3000 SD Wi-Fi Link Controller Secure Digital Card

Product Information

The WILC3000 SD is an extension board that features the ultra-low power ATWILC3000-MR110CA IoT module. It can be connected to any host microcontroller (MCU) board with Secure Digital Input/Output (SDIO) or Multimedia Card plus (MMCplus) via the on-board MMCplus card connector. This board allows for controlling Wi-Fi through either SDIO or SPI interface. Additionally, it supports Bluetooth connectivity through the Bluetooth UART interface.

Product Usage Instructions

1. Connecting the WILC3000 SD to the Host MCU:
   • If using SDIO interface, connect the WILC3000 SD to the host MCU’s SDIO interface using the on-board MMCplus card connector.
   • If using SPI interface, connect the WILC3000 SD to the host MCU’s SPI interface using jumper wires.
2. Controlling Wi-Fi:
   • If using SDIO interface, use the MMCplus card connector for controlling Wi-Fi.
   • If using SPI interface, follow the instructions provided in section 3.2 of the user guide for controlling Wi-Fi via jumper wires.
3. Controlling Bluetooth:
   To control the Bluetooth functionality of the ATWILC3000 module, connect the Bluetooth UART to the host MCU using the Bluetooth Header.
   Note: For detailed hardware specifications, regulatory approval information, hardware revision history, and other relevant details, refer to the respective sections in the user guide.

Introduction

The WILC3000 SD is a Secure Digital (SD) card interface board that supports IEEE® 802.11 b/g/n standard and Bluetooth® Low Energy (BLE) 5.0, and is designed to demonstrate the features of the low-power consumption ATWILC3000-MR110CA IoT (Internet of Things) module.

Features

• ATWILC3000-MR110CA Low-Power Consumption 802.11 b/g/n IoT Module
  • Single chip IEEE 802.11 b/g/n RF/Baseband/MAC link controller and Bluetooth 5.0 optimized for low-power mobile applications
  • Chip antenna
• Debug I2C Header
• On-Board USB to Debug UART Converter Using Microchip MCP2221A
• Current Measurement Header
• Optional Current Measurement Header for VBAT and VDDIO
• 32.768 kHz Low-Power SMD Crystal Oscillator
• MMCplus/SD Card Connector for Controlling ATWILC3000 Module using SDIO Interface
• Optional SPI Connection to MMCplus/SD Card Interface for Controlling ATWILC3000 Module
• Bluetooth UART Header
• GPIO Connector for IRQ, CHIP EN, and RESETN
• Power Supply from SD/MMCplus Connector or USB

Kit Overview

The WILC3000 SD is an extension board containing the ultra-low power ATWILC3000-MR110CA IoT module. This board can be connected to any host microcontroller (MCU) board with Secure Digital Input/Output (SDIO) or Multimedia Card plus (MMCplus) via on-board MMCplus card connector using either SDIO/SPI for controlling Wi-Fi. For controlling the Bluetooth of the ATWILC3000 module, Bluetooth UART should be connected to the host MCU using the Bluetooth Header.

Design Documentation and Relevant Links
The following list contains links to the documentation and software available for the WILC3000 SD board:

• Xplained Pro products is a series of small-sized and easy-to-use evaluation kits for microcontrollers and other products. It consists of a series of low-cost MCU boards for evaluation and demonstration of features and capabilities of different MCU families.
• Atmel Studio provides a free Atmel IDE for development of C/C++ and assembler code for microcontrollers.
• Atmel Data Visualizer is a program used for processing and visualizing data. Data Visualizer can receive data from various sources such as, the Embedded debugger data gateway interface found on Xplained Pro boards and COM ports.
• ATWILC3000-MR110CA Datasheet details the ATWILC3000-MR110CA, which is a low-power consumption 802.11 b/g/n and Bluetooth 5.0 IoT (Internet of Things) module.
• Microchip ATWILC Wireless Devices provides resources for using Microchip’s ATWILC wireless devices on Linux® Kernel.
• SAMA5 ARM® Cortex® Based MPUs page is an online directory to access the tools and software of SMART SAMA5 Cortex-A5-Based Embedded MPUs.
• Advanced Software Framework (ASF) contains example projects for ATWILC3000-MR110CA module.
• MCP2221A USB 2.0 to I2C/UART protocol converter with GPIO contains Driver package for DBG UART-USB converter.
• ATWILC3000 is product page for ATWILC3000-MR110CA.

Hardware Specifications

Headers and Connectors
Standard SD/MMCplus Connector Pin Specification
The following table provides the pin descriptions for the standard MMCplus connector in SDIO and SPI Bus mode.

WILC3000 SD SD/MMCplus Connector

• The WILC3000 SD has a PCB implemented SD card interface (J103) via the SD/MMCplus connector. This board supports only the SDIO interface; it does not support the MMCplus interface. The unused DATA 4,
• DATA5, DATA 6 pins of the MMCplus connector are connected to CHIP_EN, RESET_N, IRQ, which can be optionally used to configure the module in Sleep/Low-Power mode.
• The following table provides the customized SD/MMCplus connector pin description for WILC3000 SD board.

Power Supply Selection
The WILC3000 SD can be powered either from the SD/MMCplus Connector or from USB power supply. Header J104 is used to choose between 3.3V supply from SD/MMCplus connector or 3.3V supply from DBG UART USB connector. Refer to the table below for more information.

Current Measurement Header
Current measurement header (J105) can be used to measure the current consumed by the ATWILC3000-MR110CA module using an ammeter. J107 (not mounted) is provided to measure the current consumed by individual power rails, DVDDIO and VBAT. Remove resistor R112 and connect an ammeter between pins 1 and 2 of J107 to measure DVDDIO current. Remove resistor R113 and connect an ammeter between pins 2 and 3 of J107 to measure VBAT current.

Debug I2C Connector
I2C Slave interface is a two-wire serial interface consisting of a Serial Data Line (SDA) on module pin 10 and a serial clock line (SCL) on module pin 11. This interface is used for debugging of the ATWILC3000-MR110CA module on Debug I2C connector J102.

DBG UART-USB Connector
The ATWILC3000-MR110CA module provides a 2 pin UART interface in module pins 16(TXD) and 17(RXD) which can be used for debugging. These pins are connected to MCP2221A, on-board USB to UART converter. The end user can use the USB Micro Type B Connector, J201 to connect to the test PC and view the debug logs from ATWILC3000-MR110CA module in Serial Terminal. Serial Terminal settings to be used are Baud rate: 115200, 8 bits, No Parity, 1 Stop Bit, No flow control.

Bluetooth UART Connector
Bluetooth subsystem is controlled through Bluetooth UART1, 4 pin interface for control and data transfer. Bluetooth UART1 is available in module pins 8 (TXD), 9 (RXD), 10 (RTS) and 11 (CTS) and connected to header J101. The RTS and CTS pins of Bluetooth UART1 are used for hardware flow control. These pins can be connected to the host MCU UART and could optionally be enabled from the firmware.

GPIO Connector
IRQN, CHIP EN, RESETN are connected to optional header “J106” for connecting to Host MCU if required. IRQN needs to be connected to the host board interrupt pin for RTOS-based example applications released in Microchip’s Advanced Software Framework (ASF).

SPI Interface Usage

The following section describes how to use the SPI interface via MMCplus/SD connector.

Using SPI Interface via MMCplus/SD Connector

• The following hardware rework must be done in the WILC3000 SD board to use the SPI interface rather than SDIO interface through the same MMCplus/SD connector.
• To select the SPI interface:
  1. Pull the pin 1 of wireless module (SDIO_CFG) high. To achieve this, remove R102 and mount R101 with a 1 MOhm pull-up resistor.
  2. Remove R115 and R120 from the board and mount R116 with a 0 Ohm resistor for SPI_CLK. Replace 68 Ohm resistor mounted in R129 with a 0 Ohm resistor for SPI MISO.
  3. Remove R118 and R121 from the board and mount R117 with a 0 Ohm resistor for SPI_SS.
  4. Remove R120 and R128 from the board and mount R119 with a 0 Ohm resistor for SPI MOSI.
• In figure below, the resistors marked in green arrows must be connected and those marked in red arrows must be removed.

• The table below summarizes the resistor configuration required:

Using SPI Interface via Jumper Wires
The following hardware (jumper wires of equal length) rework must be done in the WILC3000 SD board to use the SPI interface using jumper wires:

1. Make the resistor modification explained in 3.1 Using SPI Interface via MMCplus/SD Connector to connect SPI to SD/MMCplus Connector.
2. Solder a jumper wire from pin 1 (refer the following figure) to the SPI_CS of host board.
3. Solder a jumper wire from pin 2 (refer the following figure) to the SPI_MOSI of host board.
4. Solder a jumper wire from pin 5 (refer the following figure) to the SPI CLK of host board.
5. Solder a jumper wire from pin 6 (refer the following figure) to Ground of host board.
6. Solder a jumper wire from pin 7 (refer the following figure) to the SPI_MISO of host board.
7. Use jumper wires to connect CHIP EN, RESETN from J106 to corresponding GPIOs/VCC of host board.
8. Use jumper wires to connect IRQN from J106 to host board interrupt pin.

Regulatory Approval

• WILC3000 SD Contains FCC ID: 2ADHKWILC3000
• 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.
• 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.

Hardware Revision History and Known Issues

Identifying Product ID and Revision

• The revision and product identifier of WILC3000 SD can be found by looking at the sticker on the bottom side of the PCB. The identifier and revision are printed in plain text as A09-nnnn\rr, where nnnn is the identifier and rr is the revision. In addition, the label contains a 10-digit serial number unique to each board.
• The product identifier for WILC3000 SD is A09-2629.

Revision
The current revision is Revision 2 and there is no known issue in this revision.

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References

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