*Edited on 13-July-2014 for more clarity on the subject.
The datasheet says that the DA14580 is a Class 2 device. But after checking the datasheet I came to know that it is only emitting 0dBm as output power. Then normally under Bluetooth specifications the IC is coming under class 3 which can only have a range of ~5m of range. But from the reference designs it is clear that the IC is used as a proximity detector, which needs more distance for that application.
My questions are :
*集成电路是否有新技术,can cover up to 30m with this low power emission of 0dBm.
* Why the exact range of the IC is not specified in the IC datasheet? If it depends on the antenna, how much distance it can provide if we are using the same proximity detector reference design strip antenna?
Hello Arun, your question is not so straight forward : it depends upon a number of factors. I will come back in a coupleof days with an FAQ to cover the theory on this.
BR JE_Dialog
Hope now the questions are more straight forward to you ?
It will be great if you can mention any compatible chip antennas which supports this IC without compromising the range of the antenna.
Arun,
to answer your question we need to reference a coulpe of graphs :
Note: these graphs are from the Bluetooth Low Energy developer’s handbook by Robin Heydon.
fig 5-3 and fig 5-9
Assuming isotropic antenna and no system losses:
Assuming two DA14580 devices, one for sending and one for receiving.
In this DA14580 case: sensitivity = -93 dBm, Tx output power = - 1dBm => allowable path loss = 92 dB.
92 dB path loss would result in 100 – 120 meters range in open space, direct line of sight.
This is the absolute maximum range that can be obtained.
It’s hard to say how much, but it can be considerable depending on before mentioned obstacles and materials.
BR JE_Dialog