SMBus Fan Control with 1°C Accurate Temperature Monitoring
Datasheet
The EMC2101 measures temperatures from -64°C to 127°C represented as a binary two’s complement
number. Internal temperatures are in 1°C steps, external temperatures are in 0.125°C steps.
Table 5.2 shows the temperature format for the external diode and Table 5.3 shows the temperature
format for the internal diode.
Table 5.2 EMC2101 External Temperature Data Format
TEMPERATURE (°C)
DIGITAL OUTPUT (BINARY)
<= -64
1 1 0 0
1 1 0 0
1 1 1 1
1 1 1 1
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 1
0 1 1 1
0 1 1 1
0 1 1 1
0 1 1 1
0 0 0 0
1 0 0 1
1 1 1 1
1 1 1 1
0 0 0 0
0 0 0 0
0 0 0 1
1 0 0 1
1 1 0 1
1 1 1 1
1 1 1 1
1 1 1 1
0 0 0
0 0 0
0 0 0
1 1 1
0 0 0
0 0 1
0 0 0
0 0 0
0 0 0
1 1 0
0 0 0
1 1 1
-55
-1
-0.125
0
0.125
1
25
125
>= 127.875
Diode Fault (Open condition)
Diode Fault (Short condition)
Table 5.3 EMC2101 Internal Temperature Data Format
TEMPERATURE (°C)
DIGITAL OUTPUT (BINARY)
<= -64
-55
-1
1 1 0 0
1 1 0 0
1 1 1 1
0 0 0 0
0 0 0 0
0 0 0 1
0 1 1 1
0 1 1 1
0 1 1 1
0 0 0 0
1 0 0 1
1 1 1 1
0 0 0 0
0 0 0 1
1 0 0 1
1 1 0 1
1 1 1 0
1 1 1 1
0
1
25
125
126
>= 127
SMSC EMC2101
Revision 2.53 (03-13-07)
DATA2S3HEET
SMSC [ SMSC CORPORATION ]
