RF69 datasheet(34/81 Pages) ETC2

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RF69

Page 34

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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

-1

C/Lsb

TempValue(t)

TempValue(t)-1

Returns 150d (typ.)

Needs calibration

-40

t t+1

Ambient

+85

Figure 16. Temperature Sensor Response

It takes less than 100 microseconds for the RF69 to evaluate the temperature (from setting TempMeasStart to 1 to

TempMeasRunning reset).

3.4.18. Timeout Function

The RF69 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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