Actel Fusion Mixed-Signal FPGAs
Terminology
Resolution
Resolution defines the smallest temperature change Fusion Temperature Monitor can resolve. For
ADC configured as 8-bit mode, each LSB represents 4°C, and 1°C per LSB for 10-bit mode. With 12-
bit mode, the Temperature Monitor can still only resolve 1°C due to Temperature Monitor design.
Offset
The Fusion Temperature Monitor has a systematic offset of +5°C, excluding error due board
resistance and ideality factor of the external diode, between the operation range of –40°C to
+85°C. For instance, 25°C will be read by the Temperature Monitor as 30°C plus error. The user can
remove any offset error through hardware or software during the calibration routine.
Preliminary v1.7
2-99
ACTEL [ Actel Corporation ]
