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參數(shù)資料
| 型號： | FMS2704LT1C |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO24 |
| 封裝： | TSSOP-24 |
| 文件頁數(shù)： | 21/39頁 |
| 文件大?。?/td> | 173K |
| 代理商： | FMS2704LT1C |
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PRODUCT SPECIFICATION
FMS2704/FMS2704L
28
REV. 1.01 12/2/99
Essentially, the overall response amounts to summing individ-
ual fan speed contributions that have different gains and offsets.
An example with channel A fan drive caused solely by remote
diode 1 is shown in Figure 14, which is the result of adding the
remote diode 1 segment to minimum fan speed. Using the
values from the segment example, if SPEEDLOA = 16, the
SPEED drive rises from 16 at 60°C to a 255 limit at 78°C.
Figure 14. Fan Speed Response
With both remote temperature inputs processed against the
same values, fan speed control parameters are established
through a set of fourteen registers:
1.
SPEEDLOA, TRLOA1, SLOPEA1, TRLOA2, SLOPEA2,
TRLOAL, SLOPEAL.
2.
SPEEDLOB, TRLOB1, SLOPEB1, TRLOB2, SLOPEB2,
TRLOB2, SLOPEBL.
In the slave mode, FAN_SPDA and FAN_SPDB outputs are
derived from the SPEEDA and SPEEDB registers.
Format of the values in the registers is as follows:
SPEEDLOA,B is expressed in LSBs of fan drive output. Range
is 0–255 corresponding to 0–2.5V DAC output or 0–100%
PWM on the FANSPDA,B outputs.
TRLOA1, TRLOA2, TRLOB1 and TRLOB2 must be
unsigned integer °C values.
SLOPEAL,BL,A1-2,B1-2 is expressed as a 5-bit integer plus a
fraction. SLOPE7-3 is the integer. SLOPE2-0 is the fraction in
1/8’th degrees. For example, the slope 13.5 is coded as 6C
(SLOPE7-3 = 13, SLOPE2-0 =
1/
2).
A typical Fan Speed Controller register set up is shown in
Table 4.
With these register values, Fan Controller A is selected with an
analog voltage output (rather than PWM). Below 60°C, the
fan idles at 38% (96/255) maximum speed. Above 60°C, fan
drive increases at 8 LSB/°C (0.3%/°C) until the fan drive is
255 at 80°C.
Since SLOPEAL and SLOPEA2 values are zero, neither local
temperature, TL nor remote diode 2 temperature, TR2 impact
the value of drive A, which is a solely dependant upon temper-
ature TR1.
F
A
N
A
C
O
N
D
IT
IO
N
TR1(
°C)
79
60
9.5 LSB/
°C
255
75
0
Table 4. Example Controller Register Values
Register
Address
Decimal
Hex
SPEEDALO
80
96
60
SLOPEAL
82
0
00
TRLOA1
83
60
3C
SLOPEA1
84
64
40
SLOPEA2
86
0
00
FAN_CTRL
8E
5
05
VOLTA
44
1
01
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