We are working on a new electro medical device and will have to choose how to transfer the measured data from the small device. Saving energy will be very important. The device will be a ring (for your finger ;) ) with some sensors.

Some information:

- we used SPI in older projects

- idle mode will be around 1mA

- data transfer mode will be around 25 mA, has a large header and a smaller data section. (somewhere between 100 Byte and 1kByte)

- Battery will give 3 V maximum

What would be your choice?

Some more infos on my ti-forum thread: http://e2e.ti.com/support/low_power_rf/f/538/t/221866.aspx

best regards

D.P.