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(yè)數(shù)： 55/89頁(yè)
文件大?。?/td> 1243K
代理商： EMC2103-2-AP-TR
RPM-Based Fan Controller with HW Thermal Shutdown
Datasheet
SMSC EMC2103
59
Revision 0.90 (08-19-08)
DATASHEET
The Fan Configuration 1 Register controls the general operation of the RPM based Fan Speed Control
Algorithm used on the PWM pin.
Bit 7 - EN_ALGO - enables the RPM based Fan Speed Control Algorithm. Based on the setting of the
RPM / PWM bit, this bit is automatically set or cleared when the LUT_LOCK bit is set (see
‘0’ - (default) the control circuitry is disabled and the fan driver output is determined by the Fan
Driver Setting Register.
‘1’ - the control circuitry is enabled and the Fan Driver output will be automatically updated to
maintain the programmed fan speed as indicated by the TACH Target Register.
Bits 6- 5 - RANGE[1:0] - Adjusts the range of reported and programmed tachometer reading values.
The RANGE bits determine the weighting of all TACH values (including the Valid TACH Count, TACH
Target, and TACH reading) as shown in Table 6.31.
Bits 4-3 - EDGES[1:0] - determines the minimum number of edges that must be detected on the TACH
signal to determine a single rotation. A typical fan measured 5 edges (for a 2-pole fan). For more
accurate tachometer measurement, the minimum number of edges measured may be increased.
Increasing the number of edges measured with respect to the number of poles of the fan will cause
the TACH Reading registers to indicate a fan speed that is higher or lower than the actual speed. In
order for the FSC Algorithm to operate correctly, the TACH Target must be updated by the user to
accommodate this shift. The Effective Tach Multiplier shown in Table 6.32 is used as a direct multiplier
term that is applied to the Actual RPM to achieve the Reported RPM. It should only be applied if the
number of edges measured does not match the number of edges expected based on the number of
poles of the fan (which is fixed for any given fan).
Contact SMSC for recommended settings when using fans with more or less than 2 poles.
Bit 2-0 - UPDATE - determines the base time between fan driver updates. The Update Time, along
with the Fan Step Register, is used to control the ramp rate of the drive response to provide a cleaner
Table 6.31 Range Decode
RANGE[1:0]
REPORTED MINIMUM
RPM
TACH COUNT
MULTIPLIER
10
00
500
1
0
1
1000 (default)
2
1
0
2000
4
1
4000
8
Table 6.32 Minimum Edges for Fan Rotation
EDGES[1:0]
MINIMUM TACH
EDGES
NUMBER OF FAN POLES
EFFECTIVE TACH
MULTIPLIER (BASED ON 2
POLE FANS)
10
0
3
1 pole
0.5
0
1
5
2 poles (default)
1
0
7
3 poles
1.5
1
9
4 poles
2
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