Laird Lyra S 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 Software Development Selection
Switch SW1
Dave Drogowski
Jonathan Kaye
1.3
31 Aug 2022
Added section 8.4.1 BOOT pin (PA06)
and BUTTON 0 (silkscreen BTN0)
Raj Khatri
Dave Drogowski
Jonathan Kaye

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1Overview......................................................................................................................................................................4
2Laird Connectivity Lyra S 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.........................................................................................................................................................9
8.1 Hardware Block Diagram.....................................................................................................................................9
8.2 Power Supply....................................................................................................................................................10
8.3 Lyra S Reset.....................................................................................................................................................10
8.4 Push Button and LED........................................................................................................................................10
8.4.1 BOOT pin (PA06) and BUTTON 0 (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, 3D Model ...................................................................................................................16
11 Routing RF to External Antenna on J3 RF connector...................................................................................................17

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The Lyra S Development Kit is an ultra-low cost, small form factor development and evaluation platform for the Lyra S
Wireless Bluetooth® Module.
The Lyra S Development Kit is focused on rapid prototyping and concept creation of IoT applications. It is designed around the
Lyra S 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 S 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
▪MHF4 RF connector to route RF form Lyra S module to an External Antenna (see 11 Routing RF to
External Antenna on J3 RF connector)
▪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
453-00091-K1
Lyra Series - Development Kit - Bluetooth v5.3 SIP Module with various antenna options
Applicable to following Lyra S module part number:
Part Number
Product Description
453-00091R
Lyra Series - Bluetooth v5.3 SIP Module with various antenna options –Tape / Reel
453-00091C
Lyra Series - Bluetooth v5.3 SIP Module with various antenna options –Cut / Tape

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All kits contain the following items:
Development Board
Contains soldered Lyra S module and exposes all available hardware interfaces.
Power Options
USB cable (x1) –Type Ato micro type B. Also provides serial via onboard USB –UART chip
External BLE
dipole antenna
External antenna, 2 dBi, FlexPIFA (Laird Connectivity part #001-0022) with integral RF coaxial
cable with 100 mm length and IPEX-MHF4 compatible RF connector. See 11 Routing RF to
External Antenna on J3 RF connector
The Lyra S Development Kit has been designed to simplify IoT development with the Lyra S 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 S Development Kit is easily done using a USBMicro-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.
Connecting external hardware to the Lyra S Development Kit can be done using the 20 breakout pads which present
peripherals from the Lyra S such as I2C, SPI, UART and GPIOs. The mikroBUS socket allows inserting mikroBUS add-on
boards which interface with the Lyra S 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 S Development Kit:
▪Lyra S Wireless Module with 76.8 MHz operating frequency, 2.4 GHz internal antenna or optional external antenna
(via RF trace pin) for wireless transmission, 512 kBkB 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 S development board layout
Note: To route RF from Lyra S module to RF connector on development board, see Routing RF to External Antenna on
J3 RF connector.

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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 S 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 S 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 S 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 S datasheet.
Table 2: Current consumption
Parameter
Symbol
Condition
Typ
Unit
Lyra S 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, activepacket
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 25 ˚C)
8.4
mA

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Parameter
Symbol
Condition
Typ
Unit
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 S data sheet
2 From EFM32GG12 data sheet

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The core of the Lyra S Development Kit is the Lyra S Bluetooth® Module. Refer to Understanding the Development Board for
placement and layout of the hardware components.
An overview of the Lyra S Development Kit is illustrated in the figure below.
Figure 2: Lyra S 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 S 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 S 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 S. The button is connected to pin PA06 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 (PA06) and BUTTON 0 (silkscreen BTN0) usage information.
Figure 4: Lyra S DVK Button and LED