emc2106 Standard Microsystems Corp., emc2106 Datasheet - Page 76

• Manufacturer Part Number: emc2106
• Description: Emc2106 Dual Rpm-based Linear Fan Controller With Hardware Thermal Shutdown
• Manufacturer: Standard Microsystems Corp.

ADDR
47h
87h
Revision 1.74 (05-08-08)
6.29
R/W
R/W
R/W
2
0
0
1
1
1
1
Bit 1 -0 - SPINUP_TIME[1:0] - determines the maximum Spin Time that the Spin Up Routine will run
for (see
elapsed, then an interrupt will be generated. When the RPM based Fan Speed Control Algorithm is
active, the fan driver will attempt to re-start the fan immediately after the end of the last spin up attempt.
The Spin Time is set as shown in
The Fan Step Registers, along with the Update Time, controls the ramp rate of the fan driver response
calculated by the RPM based Fan Speed Control Algorithm. The value of the registers represents the
maximum step size each fan driver will take between update times (see
When the FSC algorithm is enabled, Ramp Rate control is automatically used. When the FSC is not
active, then Ramp Rate control can be enabled by asserting the EN_RRC bit (see
Fan Step Registers
1
0
0
1
1
REGISTER
Fan 1 Max
Fan 2 Max
Section
Step
Step
SPIN_LVL[2:0]
6.9). If a valid tachometer measurement is not detected before the Spin Time has
SPINUP_TIME[1:0]
B7
1
1
1
0
0
1
1
Table 6.42 Spin Level (continued)
-
-
Table 6.44 Fan Step Registers
Table 6.43 Spin Time
B6
Table
-
-
DATASHEET
Dual RPM-Based Linear Fan Controller with Hardware Thermal Shutdown
6.43.
B5
32
32
76
0
0
1
0
1
B4
16
16
0
0
1
0
1
0
1
B3
8
8
B2
4
4
SPIN UP DRIVE LEVEL
Section
TOTAL SPIN UP TIME
B1
2
2
60% (default)
500 ms (default)
40%
45%
50%
55%
65%
250 ms
6.25).
1 sec
2 sec
Section
B0
1
1
SMSC EMC2106
6.26)
Datasheet
DEFAULT
10h
10h