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)： 63/89頁(yè)
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)
66
SMSC EMC2103
DATASHEET
6.31
TACH Reading Register
The TACH Reading Register contents describe the current tachometer reading for the fan. By default,
the data represents the fan speed as the number of 32kHz clock periods that occur for a single
revolution of the fan.
Equation [3] shows the detailed conversion from TACH measurement (COUNT) to RPM while Equation
[4] shows the simplified translation of TACH Reading Register count to RPM assuming a 2-pole fan,
measuring 5 edges, with a frequency of 32.768kHz.
See Appendix B for a table enumerating the RPM to TACH conversion for the default settings.
6.32
Look Up Table Configuration Register
The Look Up Table Configuration Register controls the setup information for the temperature to fan
drive look up table.
Bit 7 - USE_DTS_F1 - This bit determines whether the Pushed Temperature 1 Register is using DTS
data.
‘0’ (default) - The Pushed Temperature 1 Register is not using DTS data. The contents of the
Pushed Temperature 1 registers is standard temperature data.
‘1’ - The Pushed Temperature 1 Register is loaded with DTS data. The contents of this register is
automatically subtracted from a fixed value of 100°C before being compared to the Look Up Table
threshold levels.
Table 6.48 TACH Reading Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
4Eh
R
Fan TACH
4096
2048
1024
512
256
128
64
32
FFh
4Fh
R
Fan TACH
Low Byte
16
84
21
-
F8h
where:
[3]
poles = number of poles of the fan
(typically 2)
n = number of edges measured
(typically 5)
m = the multiplier defined by the
RANGE bits
[4]
COUNT = TACH Reading Register
value (in decimal)
Table 6.49 Look Up Table Configuration Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
50h
R/W
LUT
Configuration
USE_D
TS_F1
USE_D
TS_F2
LUT_L
OCK
RPM /
PWM
-
TEMP3
_CFG
-
TEMP4
_CFG
00h
RPM
1
poles
()
--------------------
n
1
–
()
COUNT
1
m
-----
×
----------------------------------
1,966,080
×
=
RPM
3,932,160
m
×
COUNT
--------------------------------------
=
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