PIC32CX-BZ2 Curiosity Board
User Guide
Introduction
The WBZ451 Curiosity Board is an efficient and modular development platform that supports rapid prototyping and demonstrates the features, capabilities, and interfaces of Microchip’s BLE+Zigbee RF Module WBZ451. This board offers integrated programming/debugging features using PICkit On-Board (PKOB4) debugger and requires only a micro-USB cable to power up and program the board. Users can expand its functionality through MikroElectronika mikroBUS Click™ adapter boards and do rapid prototyping utilizing the BLE+Zigbee enabled RF Module.
The WBZ451 Curiosity Board supports a variety of applications such as wireless lightning, home automation/Internet of Things (IoT), industrial automation, and other BLE or Zigbee-related applications.
Features
- WBZ451 BLE+Zigbee RF Module
- USB or Battery Powered
- On-board Programmer/Debug Circuit using PKoB4 based on Microchip SAME70 MCU
- Microchip MCP73871 Li-Ion/LiPo Battery Charger with Power Path Management
- On-board USB to UART Serial Converter with HW Flow Control based on Microchip MCP2200
- mikroBUS Adapter Boards
- RGB Lighting LED connected to PWM
- Reset Switch
- One User Configurable Switch
- One User LED
- 32.768 kHz Crystal
- Microchip SST26VF064B, 64 Mbit External QSPI Flash
- Microchip MCP9700A, Low Power Analog Voltage Temperature Sensor
- 10-pin ARM SWD Header for External Programmer/Debugger™ Socket to Expand Functionality using MikroElectronika Click™ For more details, refer to the 3. Hardware.
Quick References
1.1 Design Documentation
The WBZ451 Curiosity Board design documentation has the following packages:
- Schematics
- BOM
- Assembly drawings
- Layer plots
Note: Please contact Microchip Sales Representative for more information.
1.2 Reference Documentation
- PIC32CX1012BZ25048/WBZ451 Data Sheet.
1.3 Hardware Prerequisites
- WBZ451 Curiosity Board kit
1.4 Software Prerequisites
- MPLABx IDE v5.45 and above (www.microchip.com/mplab/mplab-x-ide)
- MPLABx XC32 Compiler v1.40 and above (www.microchip.com/mplab/compilers)
- Harmony 3 Configurator: Installed as a plugin in MPLABX
- Device Pack – Microchip.PIC32CX-BZ_DFP-1.0.54 and above
Kit Overview
The WBZ451 Curiosity Board contains a WBZ451 module. All the signals from the WBZ451 RF module are connected to onboard features on the curiosity board for flexibility and rapid prototyping.
Figure 2-1. WBZ451 Curiosity Board
2.1 Kit Contents
The WBZ451 Curiosity Board kit contains the following:
- WBZ451 Curiosity Board
Hardware
This chapter describes the hardware features of the WBZ451 Curiosity Board.
Figure 3-1. Block Diagram
3.1 Power Supply
The WBZ451 Curiosity Board can be powered using any of the following sources:
- USB power supply using Type-A male to micro-B USB cable.
- 4.2V Li-ion/Li-Po Battery Kit as follows:
– Connected to J3, JST PH, 2 pin, 2 mm pitch, right angle male battery header.
– Crimp style connector, battery polarity according to +/- marking on curiosity board.
– Battery is not part of the kit.
– Minimum recommended battery capacity is 400 mAh with a battery charge voltage of 4.2V.
– For example, refer to the www.adafruit.com/product/258.
The battery management circuit automatically handles the selection between the USB power supply and the battery supply.
The onboard MCP1727 voltage regulator generates a +3.3V power supply. WBZ451 module and associated circuit default powered by +3.3V.
WBZ451 module can also be powered from:
- External power supply header (J5) using an external power supply (1.9V-3.6V) for testing at different voltage levels apart from the default supply of 3.3V from the on-board regulator. To use the external power supply header, disconnect the onboard +3.3V supply according to the following table:
Table 3-1. Resistor Option to select WBZ451 Module Power Supply
| On-board 3.3V Regulator | External Power Supply |
| Mount R26 | Do not mount R26 |
| Do not mount R32 | Mount R32 |
Figure 3-2. Resistor Position to select WBZ451 Module Power Supply
3.2 Li-Po Battery Charger
A 4.2V, Li-Po Battery connected to the 2 pin, 2 mm pitch right angle male battery header. JST PH connector can be charged using Battery Management IC MCP73871-2CC from the USB power supply at 100 mA fast charge current.
Table 3-2. LD1 Battery Charger Status LED
| LED Color | Function |
| Red (charging) | The battery is charged by the USB when the USB is plugged in. |
| Red (discharging) | The battery voltage is low. Triggers, if the voltage is under 3.1V. |
| Green | Charge complete |
3.3 Debugger/Programmer Selection
By default, the on-board debugger (PKOB4) is connected to the programming pins (SWDIO and SWDCLK) of the WBZ451 module.
The WBZ451 Curiosity Board has an on-board debugger (PKOB4) based on the ATSAME70 USB MCU. The onboard debugger enables the user to power, program and debug through the micro-B USB connector (J7) from the Host PC. The voltage level translators are provided on signals between PKoB4 and WBZ451 module for supporting target voltage from 1.9V-3.6V.
In addition, the curiosity board supports external debuggers, such as MPLAB ICD4, MPLAB PICKIT4, MPLAB SNAP by connecting to the DBG header (J36).
To use external debugger on the SWD connector, remove resistors R53 and R62 to disconnect the on-board debugger from driving the programming pins.
Table 3-3. Resistor Position for Debugger Selection
| On-Board PKOB4 | External Debugger |
| R53 mounted | R53 not mounted |
| R62 mounted | R62 not mounted |
DBG Header (J36) follows the standard ARM SWD 10 pinout shown in the following figure. MPLAB ICD4, MPLAB PICKIT4 MPLAB SNAP can be connected to DBG header using a debugger adapter board (AC102015). For more details, refer to the www.microchip.com/DevelopmentTools/ProductDetails/AC102015.
Table 3-4. SWD DBG Header Details
| Pin Number of DBG Header | Pin Name | Description |
| 1 | VCC | RF module power supply |
| 2 | SWDIO | PB9, SWD programming data |
| 3 | GND | Ground |
| 4 | SWCLK | PB8, SWD programming clock |
| 5 | GND | Ground |
| 6 | SWO | PB7, optional trace output |
| 7 | NC | No connection |
| 8 | NC | No connection |
| 9 | GND | Ground |
| 10 | RESET | RF module reset NMCLR pin |
3.4 USB-UART Virtual COM Port
The WBZ451 Curiosity Board has an on-board MCP2200 acts as a USB to UART converter with hardware flow control support and enables the user through the micro-B USB connector (J7) from the Host PC. MCP2200 supports UART baud rates from 300-1000 kbps. Voltage level translators are provided on signals between MCP2200 and WBZ451 module for supporting target voltage from 1.9V-3.6V when powered externally.
Table 3-5. USB Serial Converter Pin Assignment
| Pin on MCP2200 | Pin on WBZ451 Module | Description |
| Tx | PA6, SERCOM0_PAD1 | UART Rx pin of WBZ451 module |
| Rx | PA5, SERCOM0_PAD0 | UART Tx pin of WBZ451 module |
| RTS | PA4, SERCOM0_PAD3 | UART CTS pin of WBZ451 module |
| CTS | PA3, SERCOM0_PAD2 | UART RTS pin of WBZ451 module |
3.5 mikroBUS Socket
A mikroBUS socket (J4) expands the functionality of the WBZ451 Curiosity Board using the MikroElectronika click adapter boards. The mikroBUS connector consists of two 1 x 8 female headers with Serial Peripheral Interface (SPI), Inter-Integrated Circuit (I
C), Reset Pin (RST), Pulse Width Modulation (PWM), analog and interrupt lines, as well as 3.3V, 5V, and ground power lines. A complete listing of click boards can be found at www.mikroe.com/click. 2C, SPI peripherals, and other GPIO pins are as follows.
The GPIO pins for the mikroBUS sockets are assigned to route I2 Table 3-6. mikroBUS Socket Pinout Details
| Pin Number | Pin Name | Pin on WBZ451 Module | Description |
| 1 | AN | PB1, AN5 | ADC analog input |
| 2 | RST | PB2 | General purpose I/O pin |
| 3 | CS | PA9, SERCOM1_PAD2 | Slave select pin for SPI/ General purpose I/O pin |
| 4 | SCK | PA8, SERCOM1_PAD1 | SPI clock |
| 5 | MISO | PA10, SERCOM1_PAD3 | SPI master input slave output |
| 6 | MOSI | PA7, SERCOM1_PAD0 | SPI master output slave input |
| 7 | +3.3V | +3.3V | 3.3V power |
| 8 | GND | GND | Ground |
| 9 | GND | GND | Ground |
| 10 | +5V | +5V | 5V power |
| 11 | SDA | PA13, SERCOM2_PAD0 | I2C data |
| 12 | SCL | PA14, SERCOM2_PAD1 | I2C clock |
| 13 | TX | – | – |
| 14 | RX | – | – |
| 15 | INT | PA2 | Interrupt pin/General purpose I/O pin. Shared with PWM pin |
| 16 | PWM | PA2 | PWM pin/General purpose I/O pin. Shared with INT pin |
Note: In the mikroBUS socket, both INT and PWM are connected to PA2, click board use both of them simultaneously are not supported (for example, refer to the www.mikroe.com/stepper-2-click).
3.6 Switches
The following switches are available on the WBZ451 Curiosity Board:
- Reset switch (SW1)
- User configurable switch (SW2)
In the Idle state, the level of the reset switch is pulled high using an external pull-up resistor and, when the switch is pressed, it drives the level of the switch to low.
User configurable switch is also pulled high using an external pull-up resistor and when the switch is pressed it drives pin low.
Table 3-7. Switches Description
| Switch Name | Pin on WBZ451 Module | Description |
| Reset | NMCLR | Reset switch (SW1) connected to NMCLR pin |
| USR-BTN | PB4 | User configurable switch (SW2) |
3.7 LEDs
One user-programmable blue indicator LED (D5) is available on the WBZ451 Curiosity Board and this LED can be turned ON or OFF using the connected GPIO pin PB7. Drive the pin to a high level to turn OFF the LED and drive the pin to a low level to turn ON the LED.
Important: PB7 is also an SWO pin on the WBZ451 module. During a programming/debug session with MPLABx IDE this pin is always driven low from the WBZ451 module, thus making the user LED turned ON entire DEBUG session. When DEBUG session is exited, this pin operates normally.
3.8 Temperature Sensor
The analog output from the temperature sensor (2.3V-5.5V Microchip MCP9700A, U3) is connected to one of the analog pins (PB6, AN2) of the module’s ADC channel.
3.9 QSPI Serial Flash
The WBZ451 Curiosity Board has an onboard 64-Mb, 2.3-3.6V Serial Quad I/O (SQI) Flash ( SST26VF064B, U6) memory for the storage of data. SST26VF064B default at power-up is with WP# and HOLD pins enabled and SIO2 and SIO3 pins disabled allowing for SPI protocol operations without register configuration. Register configuration is required to switch to Quad I/O operation with QSPI.
Table 3-8. QSPI Flash Pin Description
| QSPI Flash | Pin on WBZ451 Module | Description |
| CE | PB10, QSPI_CS | QSPI chip select |
| SO/SIO1 | PB13, QSPI_DATA1 | QSPI data channel 1 |
| WP/SIO2 | PA0, QSPI_DATA2 | QSPI data channel 2 |
| VSS | GND | Ground |
| SI/SIO0 | PB12, QSPI_DATA0 | QSPI data channel 0 |
| SCK | PB11, QSPI_SCK | QSPI clock |
| Hold/SIO3 | PA1, QSPI_DATA3 | QSPI data channel 3 |
| VDD | VDD | VDD |
3.10 RGB Lighting LED
Three PWM signals from the WBZ451 module are connected to RGB Lighting LED (D6) on the WBZ451 Curiosity Board.
Table 3-9. RGB Lighting LED Pin Description
| Color | Pin on WBZ451 |
| Red | PB0 |
| Green | PB3 |
| Blue | PB5 |
3.11 Power Measurement Header
To measure the power going to the WBZ451 module, a 1×2, 2.54 mm male pin header with a shunt connector (I-MEAS, J6) is provided.
3.12 32.768 kHz Crystal
The 32.768 kHz crystal is connected to SOSC pins (PA11 and PA12) of the WBZ451 module.
Getting Started
4.1 Introduction
The BLE sensor application is an excellent demonstration of one of the many real-world Bluetooth Low Energy (BLE) applications involving monitor and control of sensors, lights and so on, wirelessly. This application brings BLE concepts like advertisements and connection establishment to practice. The demo consists of the WBZ451 Curiosity Board with accompanying BLE firmware, the Microchip Bluetooth Data (MBD) smartphone application. The MBD application has the capability to scan for BLE advertisements from the WBZ451 module and to establish a connection.
Scan operation monitors the temperature sensor and status of RGB LED (ON or OFF). Establishing a BLE connection with the WBZ451 module enables users to control the RGB status (ON or OFF) as well as the intensity and color of the RGB LED using slide controls.
4.2 BLE Sensor Application Demo
- Installing the MBD smartphone application as follows:
1.1. iOS users can search for the Microchip Bluetooth Data application in App Store and install it.
1.2. Android users can directly install the xxx.apk file available as part of the early adopter package.
1.3. Enable Bluetooth on the smartphone. - Launch the application.
- Supplying power to WBZ451 Curiosity Board as follows:
3.1. Connect a USB cable to the kit or a 4.2V Li-ion/Li-Po Battery. For more details, refer to the 3.1 Power Supply.
3.2. The user-programmable blue LED starts blinking on Curiosity Board when the board is in advertisement mode. - Monitoring RGB LED state and temperature as follows:
4.1. WBZ451 Curiosity Board starts in advertisement mode to advertise its presence to a smartphone and to allow access to RGB LED ON or OFF state and temperature sensor data.
4.2. Navigate through the smartphone application as shown in the following figure to access the advertisement information.
Figure 4-1. MBD Smartphone Application
- Controlling RGB LED state ON or OFF as well as intensity and color as follows:
5.1. Click the device that shows up after initiating a scan to establish a connection with the WBZ451 module.
5.2.
– Controls the RGB LED state ON or OFF.
5.3.
– Controls the color of RGB LED when LED is ON.
5.4.
-Controls the intensity of RGB LED when LED is ON.
5.5.
– Additional information.
5.6. Press the (SW2) button on the curiosity board to toggle the state of the RGB LED, the status of the RGB LED is relayed to the smartphone application.
Figure 4-2. Status of Smartphone Application
- Disconnecting the WBZ451 module from the MBD application as follows:
6.1. Press the reset button on WBZ451 Curiosity Board.
6.2. Disable Bluetooth on smartphone.
Upon successful disconnection, the WBZ451 module starts in advertisement mode.
4.3 Tools Setup
4.3.1 Installing MPLABx IDE and IPE
- Refer to the 1.4 Software Prerequisites to download the required version of MPLABx IDE.
- Execute the installer to begin the installation of MPLABx IDE.
- Choose both MPLABx IDE and MPLABx IPE and click Next.
Figure 4-4. Select Applications for Installation
- Click Next on upcoming windows to complete the installation.
- For more details, refer to the MPLABx IDE Userguide (docs.microchip.com/ContentDelivery/web/pub.xql?c=t&action=home&pub=MPLAB_X_IDE_User_Guide&lang=en-US).
4.3.2 Installing Part Pack for PIC32CX1012BZ25048
Required version of device part pack may come preinstalled with MPLABx IDE. If newer or different part packs are needed, follow these instructions:
- Open MPLABx IDE.
- Go to Tools > Packs.
Figure 4-5. Packs Installation
- Click Install from Local Source.
Figure 4-6. Installing from Local Source
- Browse to the location, where part pack is located and click Open.
Figure 4-7. Selecting Pack File
- Wait for the installation to complete.
4.4 Programming via MPLABX IPE
- Connect the WBZ451 Curiosity Board to the PC using a USB cable, from the MPLABx IPE tool, select Device “PIC32CX1012BZ25048” and the Tool Connected.
- Check the Device Manager.
- Browse and point to the location where the Hex to be programmed is saved.
Figure 4-8. Programming via MPLABX IPE
- Click the Program button to program the device with the selected Hex file.
Figure 4-9. Programming the Device with Hex File
- Successful programming output in IPE is as follows.
Figure 4-10. Programming Output
Document Revision History
| Revision | Date | Section | Description |
| A | Oct-20 | Document | Initial revision |
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Documents / Resources
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MICROCHIP PIC32CX-BZ2 Curiosity Board [pdf] User Guide WBZ451, 2ADHKWBZ451, PIC32CX-BZ2, WBZ451, PIC32CX-BZ2 Curiosity Board, PIC32CX-BZ2, Curiosity Board, Board |
