XENO+ ™ WiFi+BLE5.0 Nano CPU Module Datasheet

IOT Sensors are the foundation of building IOT ecosystem. The IOT Sensors are piece of hardware device with low power and wireless capability that collects data and connects with internet/network. To build new IOT sensors/devices with WiFi+BLE5.0 capability in shortest time, the HW Design Engineers face challenges building these IOT devices from scratch. To reduce development time, the Design Engineers can consider using XENO+ ™ WiFi + BLE5 Nano CPU Module as their core CPU module of IOT device and focus only on adding Sensors and Power circuits around this CPU module.

The module has smallest possible size with Chip antenna and UFL antenna connector and helps in building IOT devices to achieve faster time to market. This module has WiFi and BLE5 for wireless data transfer, STM32L4 series ARM Cortex-M4, 1MB Flash, 352KB/128KB RAM, UART/SPI/I2C ports and GPIOs with Firmware Over-The-Air (FOTA) downloading capability. This module has USB Type C based 5V Power input with serial debug port and Battery power input options. This module has 3 pin SWD pins for SW development and SW debug via STM32CubeIDE for Embedded SW development.

This module comes with FOTA Downloader which is executed by default at the boot time. This FOTA Downloader can upgrade the STM32 Host firmware and WiFi Module firmware. During the initial 3-5 seconds of power-on boot time, the code checks the STM32 Host firmware version with server for any new updated version firmware available in the server. If it is available, it downloads the firmware and updates the STM32 Host firmware. The WiFi Module Firmware update feature is getting enabled and will be officially announced soon.

The module comes with device authentication mechanism part of FOTA Downloader using PKCE (Proof Key for Code Exchange) based Device authentication. The PKCE is used to provide one more security layer to the authorization code flow of OAuth. The FOTA Downloader initiates the Device Authorization Flow by requesting a set of verification codes from the authorization server by issuing an TCP/IP socket requests to the authorization server. The server can approve or deny the requests to authorise the device. After successful authentication of device, the server issues valid access token to the device. The access-token has a limited lifetime mentioned in minutes. When it expires the FOTA Downloader can fetch a new refresh-token. This access-token can be read by Embedded SW developed by the users.

CPU Module Overview

The below table shows the brief overview of modules:

	ENO-W100	ENO-W101
Module Image
Wireless Interface	WiFi 2.4 b/g/n and BLE5.0	WiFi 2.4 b/g/n and BLE5.0
Antenna	PCB Antenna	UFL Antenna
Sensor Interface	UART, SPI, I2C, ADC, DAC, PWM and GPIOs	UART, SPI, I2C, ADC, DAC, PWM and GPIOs
Pins	18x18 Castellated Pins	18x18 Castellated Pins
Size in mm	55 x 35 mm	55 x 35 mm

Product Features and Specifications:

The XENO+ ™ module product features and specifications are listed below:

Table-1: The Product features and specifications

SI NO	Features	Description
Electro – Mechanical specification
1	Boards Mounting	18x18 Castellated Pins
2	Wired interface	1x USB Type C for 5V Power and Serial debug UART interface for debug messages and user inputs.
3	Antenna	Chip antenna or UFL connector for external antenna supports 2.4G.
4	User SW programming	3 pin SWD pins for SW programming and debug via STM32CubeIDE
5	Operating temperature	-40 ~ + 85 ℃
6	Operating humidity	95% or less
7	Size	55x35 mm
8	Weight	7 grams
Power Specifications
1	Module input voltage	5V from USB Type C connector * MOSFET based switch to auto cut-off battery power when USB 5V is present.
2	Battery input voltage	2.0V to 5V Battery power from non-rechargeable (or) rechargeable battery. The battery options are listed below: * Two 1.5V AA Type Alkaline/Drycell non-rechargeable batteries connected in series for non-restricted transport. * 3.6V AA type (Li-SOCl2) non-rechargeable battery for Industrial applications. * 4.2V LiFePO4 18650rechargeable battery. The recharging circuit to be added in carrier board by customer.
WiFi/BLE Specifications
1	WiFi	2.4GHz b/g/n * PCB Antenna or uFL connector for external Antenna.
2	BLE	BLE5.0 with 2Mbps PHY, LE Coded and Extended Advertising
3	WiFi/BLE Data interface	UART based AT command interface (or) SPI based AT Command interface
4	WiFi Active Mode Power	31mA (Rx Mode @ 1Mbps 802.11b), 178mA (Tx Mode @ 1Mbps 802.11b +17.5dBm)
5	Wi-Fi Power Save Mode Power at 802.11b, 1Mbps (Clean Environment, @3.3V)	57uA (DTIM10)
6	Deep Sleep Mode Power (@3.3V, Memory Retained)	11-19uA (RTC, memory retained, depends on amount of SRAM retained)
7	Module Standby Power	55uA (STM32L4 in standby and WiFi module is in shutdown mode)
8	WiFi Power Shutdown	WiFi Power can be shut down by MCU GPIO control signal
9	Antenna	PCB Antenna (or) UFL Antenna Connector
CPU & Other Specifications
1	CPU	STM32L4 series MCU with ARM Cortex-M4 at 80MHz
2	Flash Memory	1MB with Preassigned FOTA section
3	RAM	352KB/128KB SRAM
4	Sensor Interfaces	1x SPI with two chip selects 3x UART 2x I2C 2x CAN 2x ADC 2x DAC 4x PWM 19x GPIOs
5	RTOS	FreeRTOS

Module Pinouts:

This module has 18x18 Castellated pins. The Left side 18 pins mapping and Right side 18 pins mapping are listed below. The MCU port pins can be assigned with 2 predefined module functions: Function-A and Function-B. The users can also map custom functions as per STM32L4 native GPIO functions on these pins.

Left side 18 pins connector signals:

SNO	MCU Pins	Function A	Function B
1	PA4	DAC1_OUT1	GPIO_PA4
2	PA5	DAC1_OUT2	GPIO_PA5
3	PA6	ADC1_IN11	GPIO_PA6
4	PA7	ADC1_IN12	GPIO_PA7
5	PC4	GPIO_PC4	USART3_TX
6	PC5	GPIO_PC5	USART3_RX
7	PB0	TIM3_CH3	GPIO_PB0
8	PB1	TIM3_CH4	GPIO_PB1
9	PB2	GPIO_PB2	GPIO_PB2
10	PC12	CAN2_RX	GPIO_PB12
11	PB13	CAN2_TX	I2C2_SCL
12	PB14	GPIO_PB14	I2C2_SDA
13	PB15	GPIO_PB15	TIM15_CH2
14	PC6	TIM3_CH1	GPIO_PC6
15	PC7	TIM3_CH2	GPIO_PC7
16	NRST	Active LOW RESET signal to MCU. The Push button also asserts RESET signal to LOW.
17	GND	GND pin of module.
18	VDD_3V3	Regulated 3V3 supply output from module to other circuits of carrier board.

Right side 18 pins connector signals:

SNO	MCU Pins	Function A	Function B
1	PB9	I2C1_SDA	I2C1_SDA
2	PB8	I2C1_SCL	I2C1_SCL
3	PB7	SPI1_CS0	SPI1_CS0
4	PB6	SPI1_CS1	SPI1_CS1
5	PB5	SPI1_MOSI	SPI1_MOSI
6	PB4	SPI1_MISO	SPI1_MISO
7	PB3	SPI1_SCK	SPI1_SCK
8	PD2	UART5_RX	UART5_RX
9	PC12	UART5_TX	UART5_TX
10	PC11	UART4_RX	UART4_RX
11	PC10	UART4_TX	UART4_TX
12	PA15	GPIO_PA15	GPIO_PA15
13	PA12	GPIO_PA12	CAN1_TX
14	PA11	GPIO_PA11	CAN1_RX
15	PA8	GPIO_PA8	GPIO_PA8
16	GND	GND pin of module
17	VBAT	Battery supply voltage input to module with 3V to 6V range. If Battery is connected, the module works with this battery supply.
18	VBUS_5V	USB 5V supply voltage output from module to other circuits of carrier board. When USB cable is removed, the module will switch to Battery supply on-the-fly, if battery is connected.

Module Layout and Dimensions:

This module layout and dimensions are shown below.

Module Dimensions (in mm)

Documentation:

XENO+ ™ WiFi+BLE5.0 Nano CPU Module Datasheet