User's Guide

6.3 RF performance 29
• Over The Air software update
• Mobile App for Android and iPhone smartphones
• Free cloud service for managing and visualizing sensors data
6.3 RF performance
There are two RF systems in the module, which include Lora, and Bluetooth. In this section we
briefly introduce the performance of these systems. For Lora, both the "transmission" and "receive"
performance are listed in Table 6.2 and "Bluetooth" can be found in Table 6.3.
Item Value
TX Max +18dBm
RX down to -148dBm
Table 6.2: Lora RF performance
For Bluetooth is listed in Table 6.3.
Item Value
Output Power 0dBm
Sensitivity -94dBm
Table 6.3: Bluetooth performance.
6.4 Electrical characteristics
Symbol Description Min Max Unit
V
BAT T
Battery voltage 2.7 4.2 V
V3P3
LDO
Voltage output on the internal LDO V
BAT T
3.3 V
I
V 3P3
LDO
Current output of 3V3_SNR 0 100mA mA
V
GPIO
Voltage on any GPIO pin 0 V3P3
LDO
V
V
BUS
USB charging voltage 4.2 5.75 V
I
BUS
USB charging current supply 300 mA
T
op
Operating Temperature -40 +85
◦
C
Table 6.4: Operating Range.
6.5 Antenna characteristics
The SoM module is equipped with two U.FL connectors: 2.4GHz for Bluetooth and one for 868MHz
(915MHz in US version) LoRa antenna. The parameters of the recommended antennas can be found
in Table 6.6. It is recommended to use dipole antennas as they are less susceptible to ground plane
size and are less prone to detuning by surrounding objects.