If using the Atmel 128RFA1 part to develop a SNAP device you need to be aware of a possible lock up condition that can occur if the following conditions are not observed:
http://www.atmel.com/Images/doc8266.pdf
Page 510 Section 35.6
Vpot, Vpsr are of special importance. If these conditions are not met, the chip could latch up until VCC drops below 0.3V
http://www.atmel.com/Images/doc8266.pdf
Page 510 Section 35.6
Vpot, Vpsr are of special importance. If these conditions are not met, the chip could latch up until VCC drops below 0.3V
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