MEC1322 Datasheet, PDF (303/456 Pages) Microchip Technology – Keyboard and Embedded Controller for Notebook PC

MEC1322
TABLE 26-15: DRIVE_FAIL_CNT[1:0] BIT DECODE (CONTINUED)
DRIVE_FAIL_CNT[1:0]
1
0
Number of Update Periods
1
0
32 - the Drive Fail detection circuitry will count for 32 update periods
1
1
64 - the Drive Fail detection circuitry will count for 64 update periods
TABLE 26-16: SPIN LEVEL
SPIN_LVL[2:0]
2
1
0
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
Spin Up Drive Level
30%
35%
40%
45%
50%
55%
60% (default)
65%
TABLE 26-17: SPIN TIME
SPINUP_TIME[1:0]
1
0
Total Spin Up Time
0
0
0
1
1
0
1
1
250 ms
500 ms (default)
1 sec
2 sec
26.9.7 FAN STEP REGISTER
The Fan Step Register, along with the Update Time, controls the ramp rate of the fan driver response calculated by the
RPM based Fan Control Algorithm for the Derivative Options field values of “00” and “01” in the Fan Configuration 2
Register (see Table 26-12, “Derivative Options,” on page 301).
The value of the register represents the maximum step size the fan driver will take for each update (see Section 26.9.3,
"Fan Configuration 1 Register," on page 298).
When the maximum step size limitation is applied, if the necessary fan driver delta is larger than the Fan Step, it will be
capped at the Fan Step setting and updated every Update Time ms.
The maximum step size is ignored for the Derivative Options field values of “10” and “11”.
Offset ^07h
Bits
Description
Type
7:6 RESERVED
R/W
5:0 FAN_STEP[5:0]
R/W
The Fan Step value represents the maximum step size the fan driver
will take between update times
Default
00h
10h
Reset
Event
-
VCC1_R
ESET
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DS00001719D-page 303