Two updates to last week's list: - the Cypress CYRF7936 [1] has also been mentioned as a potential candidate. It seems a bit on the inconvenient side, though, requiring a 2.4 supply (for which it has a built-in boost converter, but still ...) It has a few modulation modes that sound vaguely similar to what 802.15.4 uses, but I can't tell whether they're really the same. Also, I couldn't find any programming documentation.
- I dug a bit deeper into the documentation of the CC2543 and it's growing on me. It seems that the chip should be able to output a clock signal, too. Chip Package Clock RNG Export Unit @ 1000 Comments --------------- ------- ------- ---- ------- ----------- -------- CYRF7936 40-QFN no? no? ? 2.88 needs >= 2.4 V CC2543 32-QFN yes yes ok 2.52 [1] http://www.digikey.com/product-search/en?vendor=0&keywords=CYRF7936 The question whether we can do without a TRNG (True Random Number Generator) in the transceiver is still open. A possible source of randomness in the MCU (KL2) would be the ADC. Especially temperature measurements are terribly noisy ... which may be a good thing on this case :) Since the CC2543 seems to be able to perform both "special" tasks the AT86RF232 does in the current design, namely TRNG and providing a crystal-based clock to the MCU, it would seem like a safer choice than the A7105. So I think we have a winner after all :) - Werner _______________________________________________ Qi Hardware Discussion List Mail to list (members only): [email protected] Subscribe or Unsubscribe: http://lists.en.qi-hardware.com/mailman/listinfo/discussion
