Laird Lyra P User Manual page 7

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
USB Supply Input Voltage
Supply Input Voltage (VMCU supplied externally)
Operating Temperature
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
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
Table 2: Current consumption
Parameter Symbol
Lyra P Current I
Consumption1
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for more information.
Lyra P
Condition
MCU current consumption in EM0 mode with all peripherals
BGM
disabled (module supply voltage = 3.0 V, VSCALE2, 38.4
MHz crystal, CPU running Prime from flash at 25 ˚C)
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)
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 power at
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Symbol Min
-
V
USB
V
VMCU
T -
OP
datasheet.
7
Typ Max Unit
+5.0 - V
1
V
+3.3
˚C
+20 -
Typ Unit
28 µA/MHz
3.8 mA
8.4 mA
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