參數(shù)資料
型號: MIC74YQS TR
廠商: Micrel Inc
文件頁數(shù): 9/18頁
文件大小: 0K
描述: IC I/O EXPANDER I2C 8B 16QSOP
標準包裝: 2,500
接口: I²C,SM 總線
輸入/輸出數(shù): 8
中斷輸出:
電源電壓: 2.7 V ~ 3.6 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 16-SSOP(0.154",3.90mm 寬)
供應商設備封裝: 16-QSOP
包裝: 帶卷 (TR)
其它名稱: MIC74YQSTR
MIC74YQSTR-ND
Micrel, Inc.
MIC74
October 2006
17
M9999-101006
the fan will be shutdown by the assertion of the /SHDN
output if FAN_SPEED is zero. If FAN_SPEED is
programmed with any nonzero value, the fan will be
driven to its maximum speed for the duration of tSTART
(about 1 second) and then assume the programmed
speed. Note that the circuit in Figure 14 contains an
additional transistor, Q1, as an inverter because the
regulator in this example has an active-high shutdown
input rather than an enable input. Otherwise the circuits
function identically.
Table 3 lists the output voltages corresponding to all the
fan speeds and system states possible with these
circuits. The following equations are used to calculate
the resistor values used in MIC74 fan speed control
circuits. It is assumed here that the regulator’s internal
reference voltage is 1.24V. If the regulator uses a
different reference voltage, that value should be used
instead.
The following equations show how to calculate the
resistor values for the fan controllers. For example, when
the fan speed register contains 011b, which is the 3rd
lowest speed, RF1 and RF0 are parallel to RMIN to give the
equivalence resistor (REQ) value of 545.
REQ = RF1 || RF0 || RMIN
REQ = 1.8k || 3.6k || 1k
REQ = 545
The output voltage is calculated by using:
+
=
EQ
FB
OUT
R
1
1.24V
V
+
=
545
3k
1
1.24V
VOUT
8.06V
VOUT =
FAN_SPEED
Value
Fan Speed
Selected
RFB
RMIN
RF2
RF1
RF0
REQ
VOUT
0000 0000b
power-up
3k
1k
open
1k
4.96V
0000 0000b
fan off
3k
1k
open
1k
0V
0000 0001b
lowest
3k
1k
open
3.6k
783
5.99V
0000 0010b
2
nd lowest
3k
1k
open
1.8k
open
643
7.03V
0000 0011b
3
rd lowest
3k
1k
open
1.8k
3.6k
545
8.06V
0000 0100b
medium
3k
1k
open
500
8.68V
0000 0101b
3
rd highest
3k
1k
open
3.6k
439
9.71V
0000 0110b
2
nd highest
3k
1k
1.8k
open
391
10.75V
0000 0111b
highest
3k
1k
1.8k
3.6k
353
11.78V
Table 3. Fan Speed Selection
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