manualshive.com logo in svg

Silicon Laboratories WGM160P, User Manual, Page: 14 / 35

Share
Download
Silicon Laboratories WGM160P User Manual Download Page 14

4.  Power Supply and Reset

4.1  Radio Board Power Selection

The WGM160P on a Wireless Starter Kit can be powered by one of these sources:

• The debug USB cable
• A 3V coin cell battery
• A USB regulator on the radio board (for devices with USB support only)

The power source for the radio board is selected with the slide switch in the lower left corner of the Wireless STK Mainboard. The figure
below shows how the different power sources can be selected with the slide switch.

3.3V

VMCU

AEM

USB

BAT

USB Mini-B

Connector

Advanced 

Energy 

Monitor

5V

WGM160P

BA

T

US

B

AE

M

LDO 

 

WSTK power select
slide switch

 

WGM160P Radio Board

USB Micro-B

Connector

DC/DC

Converter

Transistor

Switch

3.3V

USB 3.3V Enable

VBUS

3 V Lithium Battery (CR2032)
Not supported for WGM160P.

Figure 4.1.  Power Switch

With the switch in the 

AEM

 position, a low noise 3.3 V LDO on the Wireless STK Mainboard is used to power the radio board. This LDO

is again powered from the debug USB cable. The AEM is now also connected in series, allowing accurate high speed current measure-
ments and energy debugging/profiling.

With the WGM160P radio board, the 

USB

 position of the power switch is disconnected. Instead, a transistor switch on the radio board

itself connects the on-board regulator to the module power supply when the target USB cable is inserted. Please note that this happens
regardless of the power switch position, so the power switch should be set to 

USB

 or 

BAT

 when using the radio board USB connector

to avoid conflict. The transistor switch allows the radio board to be powered by a USB cable even when removed from the WSTK main-
board.

With the switch in the 

BAT

 position, the WGM160P Module is powered by 2 x AA sized batteries. This requires that the external battery

holder with 2 x AA batteries is connected to the EXP header (after removing the EXP board).

The 

BAT

 switch position is the recommended position when powering the radio board with an external power source, as it disconnects

the internal LDO.

Note: 

The current sourcing capabilities of a coin cell battery is too low to supply normal operation of Wi-Fi based wireless applications.

 

Note: 

The  Advanced  Energy  Monitor  functionality  is  not  supported  when  using  the  BRD4321A  Radio  Board  with  the  Wireless  STK

Mainboard.
 

UG351: WGM160P Wi-Fi Module Wireless Starter Kit User's Guide

Power Supply and Reset

silabs.com

 | Building a more connected world.

Rev. 1.0  |  14

Summary of Contents for WGM160P

Page 1: ...monstration of some of the WGM160P s many capa bilities This document describes how to use the BRD4321A Radio Board together with a Wire less Starter Kit Mainboard BRD4321A RADIO BOARD FEATURES WGM160P Wi Fi Module with 2 MB Flash and 512 kB RAM with integrated antenna USB Micro B connector offers device mode support MicroSD card slot WIRELESS STK MAINBOARD FEATURES Advanced Energy Monitor Packet ...

Page 2: ...ly and Reset 14 4 1 Radio Board Power Selection 14 4 2 Board Controller Power 15 4 3 WGM160P Reset 15 4 4 Battery Holder 15 5 Peripherals 16 5 1 Push Buttons and LEDs 16 5 2 Memory LCD TFT Display 17 5 3 Si7021 Relative Humidity and Temperature Sensor 18 5 4 USB Micro B Connector 19 5 5 MicroSD Card Slot 19 5 6 Virtual COM Port 20 5 6 1 Host Interfaces 21 5 6 2 Serial Configuration 21 5 6 3 Hardwa...

Page 3: ... 9 1 1 USB Interface 28 9 1 2 Ethernet Interface 28 9 1 3 Serial Number Identification 28 9 2 Debug Modes 29 9 3 Debugging During Battery Operation 30 10 Kit Configuration and Upgrades 31 10 1 Firmware Upgrades 31 11 Schematics Assembly Drawings and BOM 32 12 Kit Revision History 33 12 1 SLWSTK6121A Revision history 33 12 2 SLWRB4321A Revision history 33 13 Document Revision History 34 silabs com ...

Page 4: ...th different operating frequency bands Since the mainboard is designed to work with all different radio boards the actual pin mapping from a device pin to a mainboard feature is done on the radio board This means that each radio board has its own pin mapping to the Wireless Starter Kit features such as buttons LEDs the display the EXP header and the breakout pads Because this pin mapping is differ...

Page 5: ...for expansion boards Serial port packet trace and Advanced Energy Monitoring header ARM Coresight 19 pin trace debug header Ultra low power 128x128 pixel memory LCD buttons and LEDs Battery or USB power USB serial port Packet trace Advanced Energy Monitoring EXP Board RJ45 Ethernet Jack RMII Ethernet PHY Figure 2 1 Kit Hardware Layout UG351 WGM160P Wi Fi Module Wireless Starter Kit User s Guide Ha...

Page 6: ...e AEM Simplicity Connector Debug Connector Board Controller Multiplexer O U T I N MCU WGM160P Wi Fi Module SPI 128 x 128 pixel Memory LCD I2C Si7021 Temperature Humidity Sensor USB Micro B Connector SPI GPIO EXP Header User Buttons LEDs GPIO Micro SD card reader SPI Expansion Board Ethernet Connector RMII Figure 2 2 Kit Block Diagram UG351 WGM160P Wi Fi Module Wireless Starter Kit User s Guide Har...

Page 7: ...velopment features of the kit this USB connector is also the main power source for the kit USB 5V from this connector powers the board controller and the AEM It is recommended that the USB host be able to supply at least 500 mA to this connector although the actual current required will vary depending on the application 3 2 Ethernet Connector The Ethernet connector provides access to all of the Wi...

Page 8: ... EXP10 PA3 P5 EXP8 PA2 P3 EXP6 PA1 P1 EXP4 PA0 VRF GND VMCU VCOM_RTS PB5 P22 VCOM_RX PE6 P20 DBG_RESET RESETn P18 DBG_TDO_SWO PF2 P16 GND DBG_TMS_SWDIO PF1 P14 I2C_SCL PB11 EXP15 P12 DISP_COM PA15 EXP13 P10 DISP_CS PA6 EXP11 P8 LED1 PA5 EXP9 P6 LED0 PA4 EXP7 P4 SD_MISO PB4 EXP5 P2 DISP_MOSI SD_MOSI PB3 EXP3 P0 VRF J101 GND GND 5V 5V NC NC P45 NC NC P44 P43 NC NC P42 P41 NC NC P40 3V3 3V3 P39 NC NC...

Page 9: ...eral purpose IO This allows the definition of expansion boards EXP boards that can plug into a number of different Silicon Labs Starter Kits The figure below shows the pin assignment of the EXP header Because of limitations in the number of available GPIO pins some of the EXP header pins are shared with kit features 1 2 4 8 6 10 3 5 9 7 12 13 14 11 15 16 17 18 20 19 VMCU SPI_MOSI PA0 SPI_MISO PA1 ...

Page 10: ... PE14 UART_TX LEUART0_TX 2 10 PA3 SPI_CS USART3_CS 0 8 PA2 SPI_CLK USART3_CLK 0 6 PA1 SPI_MISO USART3_RX 0 4 PA0 SPI_MOSI USART3_TX 0 2 VMCU WGM160P voltage domain included in AEM measurements 19 BOARD_ID_SDA Connected to Board Controller for identification of add on boards 17 BOARD_ID_SCL Connected to Board Controller for identification of add on boards 15 PB11 I2C_SCL SENSOR_I2C_SCL I2C1_SCL 1 1...

Page 11: ... TMS SWDIO C2D TCK SWCLK C2CK TDO SWO TDI C2Dps TRACECLK TRACED0 TRACED1 TRACED2 TRACED3 RESET C2CKps GND NC NC GND GND GND 7 GND VTARGET Cable Detect NC 3 Figure 3 4 Debug Connector Note The pinout matches the pinout of an ARM Cortex Debug ETM connector but these are not fully compatible because pin 7 is physically removed from the Cortex Debug ETM connector Some cables have a small plug that pre...

Page 12: ...f an external target with the AEM unplug the radio board from the Wireless STK Mainboard to avoid adding the radio board current consumption to the measurements Table 3 3 Simplicity Connector Pin Descriptions Pin Number s Function Description 1 VMCU 3 3 V power rail monitored by the AEM 3 3V3 3 3 V power rail 5 5V 5 V power rail 2 VCOM_TX Virtual COM Tx 4 VCOM_RX Virtual COM Rx 6 VCOM_CTS Virtual ...

Page 13: ...re designs that use this connector The Mini Simplicity Connector is designed to offer advanced debug features from the Starter Kit on a 10 pin connector Serial Wire Debug SWD with SWO Packet Trace Interface PTI Virtual COM port VCOM AEM monitored voltage rail Note Packet Trace is only available on Wireless STK Mainboards MCU Starter Kits do not support Packet Trace VAEM 1 3 RST 5 VCOM_TX 9 PTI_FRA...

Page 14: ...P radio board the USB position of the power switch is disconnected Instead a transistor switch on the radio board itself connects the on board regulator to the module power supply when the target USB cable is inserted Please note that this happens regardless of the power switch position so the power switch should be set to USB or BAT when using the radio board USB connector to avoid conflict The t...

Page 15: ...l also be issued during board controller boot up This means that removing power to the board controller unplugging the J Link USB cable will not generate a reset but plugging the cable back in will as the board controller boots up 4 4 Battery Holder In radio applications with high output power peak current consumption will exceed the current sourcing capacity of a coin cell battery To support eval...

Page 16: ...d directly to the WGM160P and are debounced by RC filters with a time constant of 1 ms The buttons are connected to pins PD6 and PD8 The kit also features two yellow LEDs marked LED0 and LED1 that are controlled by GPIO pins on the WGM160P The LEDs are con nected to pins PA4 and PA5 in an active high configuration PA5 GPIO User Buttons LEDs UIF_LED0 UIF_LED1 UIF_PB0 UIF_PB1 PD6 GPIO PD8 GPIO PA4 G...

Page 17: ...s not using the display The user application always controls ownership of the display with the DISP_ENABLE signal DISP_ENABLE LOW The board controller has control of the display DISP_ENABLE HIGH The user application WGM160P has control of the display Power to the display is sourced from the target application power domain when the WGM160P controls the display and from the board controller s power ...

Page 18: ...onal factory installed cover offers a low profile convenient means of protecting the sensor during assembly e g reflow soldering and throughout the life of the product excluding liquids hydrophobic oleophobic and particulates The Si7021 offers an accurate low power factory calibrated digital solution ideal for measuring humidity dew point and temperature in applications ranging from HVAC R and ass...

Page 19: ...r VBUS D D USB Micro B Connector USB_DM PF10 USB_DP PF11 USB_VBUS 10 nF WGM160P Figure 5 4 Radio Board USB Connector 5 5 MicroSD Card Slot BRD4321A contains a microSD card slot which is connected to the WGM160P Wi Fi Module It enables testing of SW applications uti lizing a microSD or microSDHC card CMD_MOSI DAT0_MISO CLK CD_DAT3_CS DETECT WGM160P microSD Card Connector PB3 USART2_TX 1 PB4 USART2_...

Page 20: ...Port Interface Pins Signal Description VCOM_TX Transmit data from the WGM160P to the board controller VCOM_RX Receive data from the board controller to the WGM160P VCOM_CTS Clear to Send hardware flow control input asserted by the board controller when it is ready to receive more data VCOM_RTS Request to Send hardware flow control output asserted by the WGM160P when it is ready to receive more dat...

Page 21: ... the traget device Connecting to the Wireless STK on port 4901 gives access to the same data over TCP IP Data written into the VCOM interface by the target device can be read from the socket and data written into the socket is transmitted to the target device Note Only one of these interfaces can be used at the same time with the TCP IP socket taking priority This means that if a socket is connect...

Page 22: ...nsmitted so the target firmware must be able to accept at least one more character after RTS is de asserted VCOM_RTS is connected to the CTS pin of the board controller It is enabled by setting handshake to either CTS or RTSCTS using the serial vcom config command in the admin console If CTS flow control is disabled the state of VCOM_RTS will be ignored and data will be transmitted to the target d...

Page 23: ... PA3 ETH_RMIIREFCLK 0 PA6 ETH_MDC 3 PA5 ETH_RMIIRXER 0 RJ45 TXD0 EXP14 TXD1 EXP12 RXER EXP9 RXD0 EXP8 REFCLK EXP10 RJ45 KSZ8091RND TX_P TX_N RX_P RX_N 100 BASE TX RMII PHY Figure 6 1 RMII EXP Board Note Due to pin limitations on the WGM160P module the following peripherals are not available while using the RMII Ethernet EXP board Display SD Card LEDs 6 1 BRD8026A Errata Table 6 1 BRD8026A Errata B...

Page 24: ...Kit must be connected to Ethernet using the Ethernet connector in the top left corner of the mainboard for the admin console to be available See 9 1 2 Ethernet Interface for details on the Ethernet connectivity Connect to the admin console by opening a telnet connection to the kit s IP address port number 4902 When successfully connected a WSTK prompt is displayed 7 1 2 Built in Help The admin con...

Page 25: ... data interface that does not require any additional I O pins apart from the debug interface It is based on SEGGER s Real Time Transfer RTT technology and it uses the Serial Wire Output SWO pin to get application data from the device and a shared memory interface to send data to the target application The Wireless Starter Kit makes the Virtual UART interface available on TCP IP port 4900 UG351 WGM...

Page 26: ...or display and or storage The current sense amplifier measures the voltage drop over a small series resistor and the gain stage further amplifies this voltage with two different gain settings to obtain two current ranges The transition between these two ranges occurs around 250 µA The current signal is combined with the target processor s Program Counter PC sampling by utilizing a feature of the A...

Page 27: ...as 100 nA The AEM current sampling rate is 10 kHz Note The AEM circuitry only works when the kit is powered and the power switch is in the AEM position 8 4 Usage The AEM data is collected by the board controller and can be displayed by the Energy Profiler available through Simplicity Studio By using the Energy Profiler current consumption and voltage can be measured and linked to the actual code r...

Page 28: ...erial number when connecting over Ethernet however this typically requires the computer and the kit to be on the same subnet for the dis covery protocol using UDP broadcast packets to work 9 1 1 USB Interface The USB interface is available whenever the USB Mini B connector on the left hand side of the mainboard is connected to a computer 9 1 2 Ethernet Interface The Ethernet interface is available...

Page 29: ...ller USB Host Computer DEBUG HEADER External Hardware Figure 9 1 Debug MCU Debug OUT In this mode the on board debugger can be used to debug a supported Silicon Labs device mounted on a custom board Board Controller USB Host Computer DEBUG HEADER External Hardware RADIO BOARD Figure 9 2 Debug OUT Debug IN In this mode the on board debugger is disconnected and an external debugger can be connected ...

Page 30: ...de will stop working If debug access is required when the target is running off another energy source such as a battery and the board controller is powered down the user should make direct connections to the GPIO used for debugging This can be done by connecting to the appropriate pins of the breakout pads Some Silicon Labs kits provide a dedicated pin header for this purpose UG351 WGM160P Wi Fi M...

Page 31: ... to any of them to open the kit configuration dialog Figure 10 1 Simplicity Studio Kit Information Figure 10 2 Kit Configuration Dialog 10 1 Firmware Upgrades Upgrading the kit firmware is done through Simplicity Studio Simplicity Studio will automatically check for new updates on startup You can also use the kit configuration dialog for manual upgrades Click the Browse button in the Update Adapte...

Page 32: ...nd bill of materials BOM are available through Simplicity Studio when the kit documentation pack age has been installed UG351 WGM160P Wi Fi Module Wireless Starter Kit User s Guide Schematics Assembly Drawings and BOM silabs com Building a more connected world Rev 1 0 32 ...

Page 33: ...ry Kit Revision Released Description A02 18 December 2018 Updated BRD4321A from Rev A03 to Rev A04 A01 22 October 2018 Initial kit release 12 2 SLWRB4321A Revision history Kit Revision Released Description A01 18 December 2018 Updated BRD4321A from Rev A03 to Rev A04 A00 22 October 2018 Initial kit release UG351 WGM160P Wi Fi Module Wireless Starter Kit User s Guide Kit Revision History silabs com...

Page 34: ...cument Revision History Revision 1 0 January 2019 Initial version UG351 WGM160P Wi Fi Module Wireless Starter Kit User s Guide Document Revision History silabs com Building a more connected world Rev 1 0 34 ...

Page 35: ...grant any license to design or fabricate any integrated circuits The products are not designed or authorized to be used within any FDA Class III devices applications for which FDA premarket approval is required or Life Support Systems without the specific written consent of Silicon Labs A Life Support System is any product or system intended to support or sustain life and or health which if it fai...

Reviews:

No comments