[Tinyos-help] Unit of the Voltage sensor

[Romain Thouvenin]

Hello,

Does anyone know the unit of the values read by the voltage sensor on
Tmote sky motes ?

According to the data sheet, the voltage must be between 2.1 V and 3.6
V. Recently, the batteries of two motes were exhausted, and the last
reported value was about 2200, so one could imagine that's in
millivolts. But the value with new batteries, which is supposed to be
3V (two AA), and the value when the mote is supplied through USB (also
supposed to be 3V according to the data sheet), are 4095.

Any idea ?
Thanks for your help,

Romain