Is there any information about the manufacturar of the barometer used in the Edge 520? I would like to get some information about it (resolution, accuracy, response time, etc.)
Former Member
I don't believe that information has been posted anywhere, and from teardowns I have seen of other devices it might be difficult to identify the exact barometer model used. You could always take it apart and check the model and manufacturer for yourself, but that information may not mean much as the raw pressure data is not currently exposed through CIQ. The sensor reading goes through some processing to calibrate it to reference, and that processing can cause the three parameters you listed above to change. Until an interface to the raw sensor data is available, it might be best for you to make your own measurements under controlled test conditions so you know how the provided value behaves.
The question is what Garmin means with "raw data". The typical used barometric sensors (e.g. STMicro LPS22HB) have an internal temperature sensor to compensate the temperature effect on the barometric pressure. As I expect "raw data" is not really "raw", it is already temperature compensated. If you want to program a data field for Grade based on the pressure difference over a certain distance you have to consider the temperature effect in the barometric formula.
