EMC2101 Datasheet, PDF (46/55 Pages) SMSC Corporation – SMBus Fan Control with 1°C Accurate Temperature Monitoring

6.23
SMBus Fan Control with 1°C Accurate Temperature Monitoring
Datasheet
The table should be loaded with the lowest temperature in the T1 register (50h) and increasing in
temperature for all settings.
See Section 5.6.4 for description of the Fan Control Look Up Table operation. The fan speed settings
for each temperature threshold follow the same behavior as the Fan Setting Register (see
Section 6.18).
Averaging Filter Register
ADDR.
BFh
Table 6.29 Averaging Filter Register
R/W
REGISTER
B7 B6 B5 B4 B3 B2 B1
B0
DEFAULT
R/W Averaging Filter -
-
-
-
-
FILTER[1:0]
ALERT_
COMP
00h
The Averaging Filter Register controls the level of digital averaging that is used for the External Diode
temperature measurements as well as the configuration of the ALERT / TACH pin functionality.
Bit 2 - 1 - FILTER[1:0] - control the level of digital filtering that is applied to the External Diode
temperature measurements as shown in Table 6.30. See Figure 5.5 and Figure 5.6 for examples on
the filter behavior.
Table 6.30 Averaging Settings
FILTER[1:0]
1
0
AVERAGING
0
0
Disabled (default)
0
1
Level 1
1
0
Level 1
1
1
Level 2
Bit 0 - ALERT_COMP - determines the functionality of the ALERT / TACH pin.
„ ‘0’ (default) - the ALERT / TACH pin is configured to act as an interrupt (see Section 5.4.2).
„ ‘1’ - the ALERT / TACH pin is configured to operate as a temperature comparator (see
Section 5.4.1).
Revision 2.53 (03-13-07)
46
DATASHEET
SMSC EMC2101