Laird Lyra P User manual

A
Version 1.3

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Version
Date
Notes
Contributors
Approver
1.0
27 April 2022
First Release
Raj Khatri
Dave Drogowski
Jonathan Kaye
1.1
10 June 2022
Corrected Figure 4 in 8.4 Push Button
and LED
Florian Baumgartl
Raj Khatri
Dave Drogowski
Jonathan Kaye
1.2
19 Aug 2022
Added note about silkscreen labelling
on board revisions 2.2 and previous
for SW1 in 6 Software Development
Selection Switch SW1
Dave Drogowski
Jonathan Kaye
1.3
31 Aug 2022
Added section 8.4.1 BOOT pin (PC07)
and BUTTON 0 (silkscreen BTN0)
Raj Khatri
Dave Drogowski
Jonathan Kaye

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1Overview......................................................................................................................................................................4
2Laird Connectivity Lyra P Part Numbers........................................................................................................................4
3Kit Contents.................................................................................................................................................................5
4Main Board –Features.................................................................................................................................................5
4.1 Key Features.......................................................................................................................................................5
5Understanding the Development Board.........................................................................................................................6
6Software Development Selection Switch SW1...............................................................................................................7
7Specifications...............................................................................................................................................................7
7.1 Recommended Operating Conditions...................................................................................................................7
7.2 Current Consumption...........................................................................................................................................7
8Functional Blocks.........................................................................................................................................................8
8.1 Hardware Block Diagram.....................................................................................................................................8
8.2 Power Supply....................................................................................................................................................10
8.3 Lyra P Reset .....................................................................................................................................................10
8.4 Push Button and LED........................................................................................................................................10
8.4.1 BOOT pin (PC07) and BUTTON 0 (silkscreen BTN0)....................................................................................11
8.5 On-board Debugger...........................................................................................................................................11
8.6 Hardware Connectors........................................................................................................................................12
8.6.1 Breakout Pads Pinout...................................................................................................................................13
8.6.2 MikroBUS Socket.........................................................................................................................................14
8.6.3 Qwiic Connector...........................................................................................................................................15
8.6.4 Debug USB Micro-B Connector ....................................................................................................................15
9Debugging.................................................................................................................................................................16
9.1 On-board Debugger...........................................................................................................................................16
9.2 Virtual COM Port...............................................................................................................................................16
10 Schematic, Assembly Drawing, 3DModel....................................................................................................................16

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The Lyra P Development Kit is an ultra-low cost, small form factor development and evaluation platform for the Lyra P
Wireless Bluetooth® Module.
The Lyra P Development Kit is focused on rapid prototyping and concept creation of IoT applications. It is designed around the
Lyra P Module, based on the EFR32BG22 System-on-Chip, which is an ideal device family for developing energy-friendly
connected IoT applications.
The kit features a USB interface, an on-board SEGGER J-Link debugger, one user-LED and button, and support for hardware
add-on boards via a mikroBus socket and a Qwiic connector. The hardware add-on support allows developers to create and
prototype applications using a virtually endless combination of off-the-shelf boards from mikroE, sparkfun, AdaFruit, and
Seeed Studios.
Module
▪Lyra P Wireless Bluetooth® Module
▪High performance 2.4 GHz radio
▪32-bit ARM® Cortex®-M33 with 76.8 MHz maximum operating frequency
▪512 kB flash and 32 kB RAM
Features
▪User LED and push button
▪20-pin 2.54 mm breakout pads
▪mikroBUS™ socket
▪Qwiic® connector
▪SEGGER J-Link on-board debugger
▪Virtual COM port
▪Packet Trace Interface (PTI)
▪USB-powered.
▪Software Development Selection Switch SW1 to select between 2 options (AT/BGx or C-DEV) –
SEE NOTE BELOW.
Note: Versions of the development board silkscreen prior to v2.3 may list SW1 as BGx or
AT/SWO. On these boards, BGx should be understood to be AT/BGx and AT/SWO
should be understood to be C-DEV. See 6 Software Development Selection Switch
SW1
Software
▪AT Command Set - Fully featured and extensible, proven over 5+ years. Simplest
implementation with all key Wireless Xpress features, proven over 5 years
▪Wireless Xpress - Frozen at current release, path for existing Silicon Labs customers. Secure
FOTA-capable firmware, Xpress command API for iOS/Android
▪C Code - Full software development with Silicon Labs SDK and toolchain. Use Simplicity Studio
IDE for full functionality of Silicon Labs HW/SW
Part Number
Description
453-00090-K1
Lyra Series - Development Kit - Bluetooth v5.3 PCB Module with integrated antenna
Applicable to following Lyra P part numbers:
Part Number
Product Description
453-00090R
Lyra Series - Bluetooth v5.3 PCB Module with integrated antenna - Tape / Reel
453-00090C
Lyra Series - Bluetooth v5.3 PCB Module with integrated antenna –Cut / Tape

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All kits contain the following items:
Development Board
Contains soldered Lyra P module and exposes all available hardware interfaces.
Power Options
USB cable (x1) –Type A to micro type B. Also provides serial via onboard USB –UART chip
The Lyra P Development Kit has been designed to simplify IoT development with the Lyra P wireless module. The kit includes
a mikroBUS™ socket and Qwiic® connector, allowing users to add features to the kit with a large selection of off-the-shelf
boards.
Programming the Lyra P Development Kit is easily done using a USB Micro-B cable and the on-board J-Link debugger. A USB
virtual COM port provides a serial connection to the target application, and the Packet Trace Interface (PTI) offers invaluable
debug information about transmitted and received packets in wireless links. The Lyra P Development Kit is supported in
Silicon Labs’ Simplicity Studio™ and a Board Support Package (BSP) is provided to give application developers a flying start.
Connecting external hardware to the Lyra P Development Kit can be done using the 20 breakout pads which present
peripherals from the Lyra P such as I2C, SPI, UART and GPIOs. The mikroBUS socket allows inserting mikroBUS add-on
boards which interface with the Lyra P through SPI, UART or I2C. The Qwiic connector can be used to connect hardware from
the Qwiic Connect System through I2C.
The following key hardware elements are included on the Lyra P Development Kit:
▪Lyra P Wireless Module with 76.8 MHz operating frequency, 2.4 GHz ceramic antenna for wireless transmission, 512 kB
kB flash, and 32 kB RAM
▪One LED and one push button
▪On-board SEGGER J-Link debugger for easy programming and debugging, which includes a USB virtual COM port
and Packet Trace Interface (PTI)
▪MikroBUS™ socket for connecting click boards™ and other mikroBUS add-on boards
▪Qwiic® connector for connecting Qwiic Connect System hardware
▪Breakout pads for GPIO access and connection to external hardware
▪Reset button
▪Software Development Selection Switch SW1 to select between 2 options (AT/BGx or C-DEV) –SEE NOTE BELOW.
Note: Versions of the development board silkscreen prior to v2.3 may list SW1 as BGx or AT/SWO. On these
boards, BGx should be understood to be AT/BGx and AT/SWO should be understood to be C-DEV. See 6
Software Development Selection Switch SW1

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Note: Versions of the
development board silkscreen
prior to v2.3 may list SW1 as BGx
or AT/SWO. On these boards,
BGx should be understood to be
AT/BGx and AT/SWO should be
understood to be C-DEV. See 6
Software Development Selection
Switch SW1
Figure 1: Lyra P development board layout

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Development board switch SW1 is used for selecting between two Software Development types, namely Bluetooth Xpress /
AT Commands or C Code Development, as described below. SW1 is used to determine the behaviour of the Development
board. Two possible switch positions are available as follows:
AT/BGx (Left-hand position) - This position should be used when Silabs’ Bluetooth
Xpress or Laird Connectivity’s Lyra AT-Interface application is being evaluated.
Note: On development boards 2.2 and prior, AT/BGx is labelled BGx.
C-DEV (Right-hand Position) –This position should be used when native C code
development, using the samples provided by Silabs Simplicity Studio is being performed.
Note: On development boards 2.2 and prior, C-DEV is labelled AT/SWO.
The default position for SW1 is the right-hand position, ‘C-DEV’(previously labeled AT/SWO).
Table 1: Recommended operating conditions
Parameter
Symbol
Min
Typ
Max
Unit
USB Supply Input Voltage
VUSB
-
+5.0
-
V
Supply Input Voltage (VMCU supplied externally)
VVMCU
+3.31
V
Operating Temperature
TOP
-
+20
-
˚C
1 The typical supply voltage to the Lyra P is 3.0 V, but the maximum voltage is a function of temperature and average lifetime
current load. Over a 10-year lifespan, the average lifetime current load should not exceed 60 mA when the supply voltage is
3.3 V. See the Lyra P datasheet for more information.
The operating current of the board greatly depends on the application and the amount of external hardware connected. See
Table 2 for typical current consumptions for the Lyra P and the on-board debugger. Note that the numbers are taken from the
data sheets for the devices. For a full overview, see the Lyra P datasheet.
Table 2: Current consumption
Parameter
Symbol
Condition
Typ
Unit
Lyra P Current
Consumption1
IBGM
MCU current consumption in EM0 mode with all peripherals
disabled (module supply voltage = 3.0 V, VSCALE2, 38.4
MHz crystal, CPU running Prime from flash at 25 ˚C)
28
µA/MHz
Radio system current consumption in receive mode, active
packet reception (VDD = 3.0 V, MCU in EM1 and all MCU
peripherals disabled, HCLK = 38.4 MHz, 1Mbit/s, 2GFSK, f =
2.4 GHz at 25 ˚C)
3.8
mA
Radio system current consumption in transmit mode (VDD
= 3.0 V, MCU in EM1 and all MCU peripherals disabled,
HCLK = 38.4 MHz, f = 2.4 GHz, CW, 6 dBm output powerat
8.4
mA

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Parameter
Symbol
Condition
Typ
Unit
25 ˚C)
On-board Debugger
Sleep Current
Consumption2
IDBG
On-board debugger current consumption when USB cableis
not inserted (EFM32GG12 EM4S mode current consumption)
80
nA
1 From Lyra P data sheet
2 From EFM32GG12 data sheet
The core of the Lyra P Development Kit is the Lyra P Bluetooth® Module. Refer to Understanding the Development Board for
placement and layout of the hardware components.
An overview of the Lyra P Development Kit is illustrated in the figure below.

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Figure 2: Lyra P DVK block diagram

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The kit is powered by the debug USB cable as illustrated in the figure below.
Figure 3: Lyra P DVK power diagram
The 5 volt power net on the USB bus is regulated down to 3.3 V using an LDO (low-dropout regulator). An automatic isolation
circuit isolates the LDO when the USB cable is not plugged in.
Power can be injected externally on the VMCU net if the USB cable is removed, and no other power sources are present on
the kit. Failure to follow this guideline can cause power conflicts and damage the LDO.
The Lyra P can be reset by a few different sources:
▪A user pressing the RESET button.
▪The on-board debugger pulling the #RESET pin low.
The kit has one user push button marked BTN0 and one LED marked LED0 that are each connected to a GPIO on the Lyra
P. The button is connected to pin PC07 and it is debounced by an RC filter with a time constant of 1 ms. The logic state of the
button is high while the button is not being pressed, and low when the button is pressed. The LED is configurable in firmware
for user’s application. See BOOT pin (PC07) and BUTTON 0 (silkscreen BTN0) usage information.
Figure 4: Lyra P DVK Button and LED

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For the Lyra P module the BOOT pin is on PC07 (pin29). On the Lyra dev board BTN0 (Button0) is by default mapped to the
BOOT pin for easier utilisation.
The BOOT pin (PA06) is used to determine when execution of the bootloader is required. Upon reset, execution of the
bootloader begins. The state of the BOOT pin is read immediately upon start-up of the bootloader. If LOW (BNT0 pressed),
execution of the bootloader continues, facilitating firmware update via the UART. If the BOOT pin is HIGH (BTN0 not pressed),
the bootloader will stop execution and pass control to the main applicationfirmware.
Please refer to respective DVK schematics and Serial DFU section of User Guide - Firmware Options and Upgrading - Lyra
Series for more information.
The Lyra P Development Kit contains a microcontroller separate from the Lyra P that provides the user with an on- board J-
Link debugger through the USB Micro-B port. This microcontroller is referred to as the "on-board debugger”and is not
programmable by the user. When the USB cable is removed, the on-board debugger goes into a very low power shutoff mode
(EM4S), consuming around 80 nA typically (EFM32GG12 data sheet number).
In addition to providing code download and debug features, the on-board debugger also presents a virtual COM port for
general purpose application serial data transfer. The Packet Trace Interface (PTI) is also supported which offers
invaluable debug information about transmitted and received packets in wireless links.
The figure below shows the connections between the target Lyra P device and the on-board debugger. See Debugging
section.
Debugging for more details on debugging.
Figure 5: Lyra P DVK Debugger Connections

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The Lyra P Development Kit features a USB Micro-B connector, 20 breakout pads, a mikroBUS connector for connecting
mikroBUS add-on boards, and a Qwiic connector for connecting Qwiic Connect System hardware. The connectors are placed
on the top side of the board, and their placement and pinout are shown in the figure below. For additional information on the
connectors, see the following sub chapters.
Figure 6: Lyra P DVK hardware connectors

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Twenty breakout pads are provided and allow connection of external peripherals. There are 10 pads on the left side of the
board, and 10 pads on the right. The breakout pads contain a number of I/O pins that can be used with most of the Lyra P
features. Additionally, the VMCU (main board power rail), 3V3 (LDO regulator output), and 5V power rails are also
exposed on thepads.
The pin-routing on the Lyra P is very flexible, so most peripherals can be routed to any pin. However, pins may be shared
between the breakout pads and other functions on the Lyra P Development Kit. The table below includes an overview of the
breakout pads and functionality that is shared with the kit.
Table 3: Lyra P DVK Breakout Pads Pinout
Pin
Connection
Shared Feature
(Top View) Left Side Breakout Pins (J1)
1
PC07
Button
2
PA08
LED
3
GND
Ground
4
5V
Board USB voltage
5
PD03
MikroBUS I2C_SDA, Qwiic I2C_SDA
6
PD02
MikroBUS I2C_SCL, Qwiic I2C_SCL
7
PB01
MikroBUS UART_TX
8
PB02
MikroBUS UART_RX
9
PB03
MikroBUS INT
10
PB04
MikroBUS PWM
(Top View) Right Side Breakout Pins (J2)
1
RST
Lyra P reset, active low.
2
PA06
3
GND
Ground
4
VMCU
Lyra P voltage domain
5
PC04
MikroBUS SPI_MOSI
6
PC05
MikroBUS SPI_MISO
7
PC02
MikroBUS SPI_SCK
8
PC03
MikroBUS SPI_CS
9
PC06
MikroBUS RST
10
PB00
MikroBUS Analog

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The Lyra P Development Kit features a mikroBUS™ socket
compatible with mikroBUS add-on boards. MikroBUS add-on
boards can expand the functionality of the kit with peripherals
such as sensors and LCDs. Add-on boards follow the
mikroBUS socket pin mapping and communicates with the on-
kit Lyra P through UART, SPI or I2C. Several GPIOs are
exposed on the mikroBUS socket. MikroBUS add-on boards
can be powered by the 5V or VMCU power rails, which are
available on the mikroBUS socket.
The pinout of the Lyra P on the kit is made such that all
required peripherals are available on the mikroBUS socket.
The I2C signals are, however, shared with the Qwiic connector,
and all mikroBUS signals are also routed to adjacent breakout
pads.
When inserting a mikroBUS add-on board, refer to the
orientation notch on the Lyra P Development Kit, shown in the
figure below, to ensure correct orientation. Add-on boards have
a similar notch that needs to be lined up with the one shown
below.
Figure 7: mikroBUS add-on board orientation
The table below gives an overview of the mikroBUS socket pin connections to the Lyra P.
Table 4: Pin connections from mikroBUS socket to Lyra P
Pin
Name
Pin Function
Connection
Shared Feature
Suggested
Mapping
AN
Analog
PB00
BREAKOUT_RIGHT10
IADC0
RST
Reset
PC06
BREAKOUT_RIGHT9
CS
SPI Chip Select
PC03
BREAKOUT_RIGHT8
USARTx.CS
SCK
SPI Clock
PC02
BREAKOUT_RIGHT7
USARTx.CLK
MISO
SPI Master Input
Slave Output
PC05
BREAKOUT_RIGHT6
USARTx.RX
MOSI
SPI Master Output
Slave Input
PC04
BREAKOUT_RIGHT5
USARTx.TX
PWM
PWM output
PB04
BREAKOUT_LEFT10
TIMER0.CCx
INT
HardwareInterrupt
PB03
BREAKOUT_LEFT9
RX
UART Receive
PB02
BREAKOUT_LEFT8
USARTx.RX
TX
UART Transmit
PB01
BREAKOUT_LEFT7
USARTx.TX
SCL
I2C Clock
PD02
QWIIC_I2C_SCL,
BREAKOUT_LEFT6
I2Cx.SCL
SDA
I2C Data
PD03
QWIIC_I2C_SDA,
BREAKOUT_LEFT5
I2Cx.SDA
3V3
VCC 3.3V power
VMCU
Lyra P voltage domain
3V3
5V
VCC 5V power
5V
Board USB voltage
5V
GND
Reference Ground
GND
Ground
GND

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The Lyra P Development Kit features a Qwiic® connector compatible with Qwiic Connect System hardware. The Qwiic
connector providesan easy way to expand the functionality of the Lyra P Development Kit with sensors, LCDs, and other
peripherals over the I2C interface. The Qwiic connector is a 4-pin polarized JST connector, which ensures the cable is inserted
the right way.
Qwiic Connect System hardware is daisy chainable as long as each I2C device in the chain has a unique I2C address.
Note: The Qwiic I2C connections onthe Lyra P Development Kit are shared with the mikroBUS I2C signals.
The Qwiic connector and its connections to Qwiic cables and the Lyra P are illustrated in the figure below.
Figure 8: Qwiic connector
The table below gives an overview of the Qwiic connections to the Lyra P.
Table 5: Qwiic connections to Lyra P
Qwiic
Pin
Connection
Shared Feature
Suggested Peripheral Mapping
Ground
GND
Ground
3.3V
VMCU
Lyra P voltage domain
SDA
PD03
MIKROE_I2C_SDA,
BREAKOUT_LEFT5
I2Cx.SDA
SCL
PD02
MIKROE_I2C_SCL,
BREAKOUT_LEFT6
I2Cx.SCL
The debug USB port can be used for uploading code, debugging, and as a Virtual COM port. More information is available
in Debugging section.

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The Lyra P Development Kit contains an on-board SEGGER J-Link Debugger that interfaces to the target Lyra P using the
Serial WireDebug (SWD) interface. The debugger allows the user to download code and debug applications running in the
target Lyra P. Additionally, it also provides a virtual COM port (VCOM) to the host computer that is connected to the target
device's serial port, for general purpose communication between the running application and the host computer. The Packet
Trace Interface (PTI) is also supported by the on-board debugger, which offers invaluable debug information about transmitted
and received packets in wireless links. The on- board debugger is accessible through the USB Micro-B connector.
The on-board debugger is a SEGGER J-Link debugger running on an EFM32. The debugger is directly connected to the
debug and VCOM pins of the target Lyra P.
When the debug USB cable is inserted, the on-board debugger is automatically active and takes control of the debug and
VCOM inter- faces. This means that debug and communication will not work with an external debugger connected at the same
time. The on-board LDO is also activated which then powers the board. When the USB cable is removed, the on-board
debugger goes into a very low power shutoff mode (EM4S), consuming around 80 nA typically (EFM32GG12 data sheet
number). This means that an application running off batteries will not be affected too much by the on-board debugger power
consumption. Since the I/O voltage rail of the debuggerremains powered in the battery-operated mode, the pins connected to
the debug and VCOM interfaces maintain proper isolation and prevent leakage currents.
The virtual COM port is a connection to a UART of the target Lyra P and allows serial data to be sent and received from the
device. The on-board debugger presents this as a virtual COM port on the host computer that shows up when the USB cable is
inserted.
Data is transferred between the host computer and the debugger through the USB connection, which emulates a serial port
using the USB Communication Device Class (CDC). From the debugger, the data is passed on to the target device through a
physical UART connection.
The serial format is 115200 bps, 8 bits, no parity, and 1 stop bit by default. For more information on
Note: Changing the baud rate for the COM port on the PC side does not influence the UART baud rate between the debugger
and the target device.
Schematic, assembly drawing, 3D model are available on the Lyra Series product page in Documentation->Technical
drawings:
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