SMBus Fan Control with 1°C Accurate Temperature Monitoring
Datasheet
Bit 6 - INT_MSK - Disables interrupts for the Internal Diode.
‘0’ (default) - The Internal Diode will generate an interrupt if its measured temperature exceeds the
Internal Diode high limit.
‘1’ - the Internal Diode will not generate interrupts.
Bit 4 - HIGH_MSK - Disables interrupts for the External Diode high limit.
‘0’ (default) - The External Diode will generate an interrupt if its measured temperature exceeds
the External Diode high limit.
‘1’ - the External Diode will not generate an interrupt when the high limit is exceeded.
Bit 3 - LOW_MSK - Disables interrupts for the External Diode low limit.
‘0’ (default) - The External Diode will generate an interrupt if its measured temperature drops below
the External Diode low limit.
‘1’ - the External Diode will not generate an interrupt when the temperature drops below the low
limit.
Bit 1 - TCRIT_MSK - Disables interrupts for the TCRIT Limit.
‘0’ (default) - An interrupt will be generated if the External Diode Temperature exceeds TCRIT.
‘1’ - An interrupt will not be generated if TCRIT is exceeded.
Bit 0 - TACH_MSK - Disables interrupts for the TACH Limit.
‘0’ (default) - An interrupted will be generated if the measured TACH value exceeds the TACH Limit
(indicating that the fan speed is too slow).
‘1’ - An interrupt will not be generated if the TACH limit is exceeded.
6.12
External Ideality Factor Register
Table 6.12 External Ideality Factor Register
ADDR.
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
External
Ideality Factor
17h
R/W
-
-
IDCF[5:0]
12h
This register stores the ideality factor that is automatically applied to the external diode. The Ideality
factor is a 6 bit value that allows for a bi-directional trim centered on an ideality factor of 1.008.
Table 6.13 defines each setting and the corresponding Ideality factor.
Table 6.13 Ideality Factor Look-Up Table
SETTING
FACTOR
SETTING
FACTOR
SETTING
FACTOR
08h
09h
0Ah
0Bh
0Ch
0Dh
0Eh
0.9949
0.9962
0.9975
0.9988
1.0001
1.0014
1.0027
18h
19h
1Ah
1Bh
1Ch
1Dh
1Eh
1.0159
1.0172
1.0185
1.0200
1.0212
1.0226
1.0239
28h
29h
2Ah
2Bh
2Ch
2Dh
2Eh
1.0371
1.0384
1.0397
1.0410
1.0423
1.0436
1.0449
SMSC EMC2101
Revision 2.53 (03-13-07)
DATA3S7HEET
SMSC [ SMSC CORPORATION ]
