User's Manual

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LHT65 Temperature & Humidity sensor 28 / 40
3.3.2 Power consumption Analyze
Below is the transmit power consumption of the system:
1. Deep Sleep (Stop mode):
a) LHT65 without sensor. ~ 3uA
b) With E1 sensor: ~ 4uA
2. Sampling current while reading E1.
 Built-in sensor sampling time: 120ms. 2mA
 E1 sensor sampling time: 750ms, current: 1.5mA
 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 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 case:
1) Lower power LoRa radio. Device has a good signal to gateway
2) Higher power LoRa radio. Device has a poor signal to gateway
Scenario-A, Lower Power Case (Good signal quality in EU868 band)
 Radio Parameter: SF7, 125kHz, 14dbm
 Transmit interval: 15 minutes.
 Payload : 11 Bytes.