RFM69W Datasheet, PDF (34/78 Pages) List of Unclassifed Manufacturers – ISM TRANSCEIVER MODULE

RFM69W
3.4.17. Temperature Sensor
When temperature is measured, the receiver ADC is used to digitize the sensor response. Most receiver blocks are
disabled, and temperature measurement can only be triggered in Standby or Frequency Synthesizer modes.
The response of the temperature sensor is -1°C / Lsb. A CMOS temperature sensor is not accurate by nature, therefore it
should be calibrated at ambient temperature for precise temperature readings.
TempValue
TempValue(t)
TempValue(t)-1
Returns 150d (typ.)
Needs calibration
-1°C/Lsb
-40°C
t t+1
Ambient
+85°C
Figure 16. Temperature Sensor Response
It takes less than 100 microseconds for the RFM69W to evaluate the temperature (from setting TempMeasStart to 1 to
TempMeasRunning reset).
3.4.18. Timeout Function
The RFM69W includes a Timeout function, which allows it to automatically shut-down the receiver after a receive
sequence and therefore save energy.
‹ _{Timeout interrupt is generated TimeoutRxStart x 16x Tbit after switching to RX mode if RssiThreshold flag does not}
raise within this time frame
‹ Timeout interrupt is generated TimeoutRssiThresh x 16 x Tbit after RssiThreshold flag has been raised.
This timeout interrupt can be used to warn the companion processor to shut down the receiver and return to a lower power
mode.
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