參數(shù)資料
型號(hào)： EMC2103-2-AP-TR
廠商： STANDARD MICROSYSTEMS CORP
元件分類： 模擬信號(hào)調(diào)理
中文描述： SPECIALTY ANALOG CIRCUIT, QCC16
封裝： 4 X 4 MM, ROHS COMPLIANT, QFN-16
文件頁數(shù)： 61/89頁
文件大?。?/td> 1243K
代理商： EMC2103-2-AP-TR
RPM-Based Fan Controller with HW Thermal Shutdown
Datasheet
Revision 0.90 (08-19-08)
64
SMSC EMC2103
DATASHEET
The Fan Step Register, along with the Update Time, control the ramp rate of the fan driver response.
The value of the registers represents the maximum step size each fan driver will take between update
times (see Section 6.22).
All modes of operation have the options to use the Fan Step Register (and update times) for ramp rate
control based on the Fan Configuration 2 Register settings. The Fan Speed Control Algorithm will
always use the Fan Step Register settings (but see application note below).
APPLICATION NOTE: If the Fan Speed Control Algorithm is used, the default settings in the Fan Configuration 2
Register will cause the maximum fan step settings to be ignored.
The Fan Step Register is software locked.
6.27
Fan Minimum Drive Register
The Fan Minimum Drive Register stores the minimum drive setting for the RPM based Fan Speed
Control Algorithm. This register is not used if the FSC is not active. The RPM based Fan Speed Control
Algorithm will not drive the fan at a level lower than the minimum drive unless the target TACH Target
is set at FFh (see Section 6.30)
During normal operation, if the fan stops for any reason (including low drive), the RPM based Fan
Speed Control Algorithm will attempt to restart the fan. Setting the Fan Minimum Drive Registers to a
setting that will maintain fan operation is a useful way to avoid potential fan oscillations as the control
circuitry attempts to drive it at a level that cannot support fan operation.
The Fan Minimum Drive Register is software locked.
6.28
Valid TACH Count Register
The Valid TACH Count Register store the maximum TACH Reading Register value to indicate that the
the fan is spinning properly. The value is referenced at the end of the Spin Up Routine to determine
if the fan has started operating and decide if the device needs to retry.
See Equation [4] for translating the count to an RPM.
If the TACH Reading Register value exceeds the Valid TACH Count Register (indicating that the Fan
RPM is below the threshold set by this count), then a stalled fan is detected. In this condition, the
algorithm will automatically begin its Spin Up Routine.
APPLICATION NOTE: The automatic invoking of the Spin Up Routine only applies if the Fan Speed Control
Algorithm is used. If the FSC is disabled, then the device will only invoke the Spin Up Routine
when the PWM setting changes from 00h.
Table 6.44 Minimum Fan Drive Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
48h
R/W
Fan Minimum
Drive
128
64
32
16
8
4
2
1
66h
(40%)
Table 6.45 Valid TACH Count Register
ADDR
R/W
REGISTER
B7B6B5B4B3B2B1B0
DEFAULT
49h
R/W
Valid TACH
Count
4096
2048
1024
512
256
128
64
32
F5h
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