Hi Ti Experts
We are making a BLE beacon project which uses LMT85 temperature sensors.
I have few questions regarding CC2640 Module and LMT85 temperature sensor
1)How does the +/- 0.4 degrees accuracy of the sensor compare with the ADC accuracy over the sensor OUT voltage range? What accuracy should we expect with a single ADC sample?
2) As the battery decays in voltage, will the ADC reading of the sensor need to be adjusted to get an accurate reading (see figure 5-18 in CC2640 datasheet)? How much variance is this?
3) As the temperature of CC2640 changes, ADC output changes (see figure 5-19 in CC2640 datasheet) - how much variance is this in our temperature reading? We expect to read values -10C to 50C, maybe up to 85C.
4) Does connection mode or OTA require sleeping while maintaining a connection? For transmit only, are there any power benefits for using an external 32kHz crystal rather than internal oscillator? I.e. parts of CC2640 can sleep rather than generating oscillator?
Plz reply ASAP.