Dragino LSN50 LoRa, Руководство пользователя

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LSN50 LoRa Sensor Node User Manual 34
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2.8 Battery Analysis
2.8.1 Battery Type
The LSN50 battery is a combination of a 4000mAh Li/SOCI2 Battery and a Super Capacitor.
The battery is non-rechargeable battery type with a low discharge rate (<2% per year). This
type of battery is commonly used in IoT devices such as water meter.
The battery is designed to last for more than 5 years for the LSN50.
The battery related documents as below:
● Battery Dimension ,
●
Lithium-Thionyl Chloride Battery
datasheet , Tech Spec
● Lithium-ion Battery-Capacitor datasheet , Tech Spec
2.8.2 Power consumption Analyze
In a minimum system with DS18B20 and Oil Sensor and default firmware, the power
consumption includes:
1.
Deep Sleep (Stop mode) for STM32. ~ 5uA
2. Sampling current while reading DS18B20 and Oil Sensor
●
Oil Sensor sampling time: 200us, current: 0.3mA
●
DS18B20 sampling time: 750ms, current: 0.64mA
●
Above power should add 8mA CPU power in working mode.
3. LoRaWAN transmit and receive time consumption. The LoRa TX / RX time and power
can be found in the
LoRa calculator tool .
In a typical LoRaWAN data transmit. The energy profile is as below:
In the LoRaWAN protocol, the device will transfer in different LoRa Radio, and have different
energy profile in LoRa part. We can calculate the battery life in two cases:
1)
Lower power LoRa radio. Device has a good signal to gateway
2) Higher power LoRa radio. Device has a poor signal to gateway