RPM-Based Fan Controller with HW Thermal Shutdown
Datasheet
Table 6.19 Update Time
UPDATE[2:0]
1
2
0
UPDATE TIME
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
100ms
200ms
300ms
400ms (default)
500ms
800ms
1200ms
1600ms
6.14
Fan Spin Up Configuration Register
Table 6.20 Fan TACH Configuration Register
ADDRESS
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
53h
Fan Spin Up
Configuration
-
-
-
-
-
LEVEL
SPINUP_TIM 01h
E [1:0]
The Fan Spin Up Configuration Register controls the settings of Spin Up Routine used by the RPM
based Fan Control Algorithm. The Fan Spin Up Configuration Register is software locked.
Bit 2 - LEVEL - determines the spin up level that is used whenever the Spin Up Routine is initiated
after power-up
‘0’ (default) - the spin up level will be 60% of full scale.
‘1’ - the spin up level will be 75% of full scale.
Bit 1 -0 - SPINUP_TIME[2:0] - determines the maximum Spin Time that the Spin Up Routine will run
for (see Section 5.3.3). If a valid TACH is not detected before the Spin Time has elapsed, then an
interrupt will be generated. When the RPM based Fan 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 Table 6.21.
Table 6.21 Spin Time
SPINUP_TIME[1:0]
1
0
TOTAL SPIN UP TIME
0
0
0
1
250 ms
500 ms (default)
Revision 1.95 (10-19-06)
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