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MIC74 датащи(PDF) 16 Page - Micrel Semiconductor

номер детали MIC74
подробное описание детали  2-Wire Serial I/O Expander and Fan Controller Advance Information
PDF  20 Pages
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производитель  MICREL [Micrel Semiconductor]
домашняя страница  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MIC74 датащи(HTML) 16 Page - Micrel Semiconductor

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MIC74
Micrel
MIC74
16
August 1, 2000
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Table 3. Fan Speed Selection
in the configuration register, 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 t
START
(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 011
b, which is the 3rd lowest speed,
R
F1 and RF0 are parallel to RMIN to give the equivalence
resistor (R
EQ) value of 545Ω.
RR
R
R
EQ
MIN
=
F1
F0
||
||
R
EQ = 1.8k
3.6k 1k
||
||
R
EQ =Ω
545
The output voltage is calculated by using:
V
R
R
OUT
FB
EQ
=+


1.24V 1
V
OUT =+
Ω


1.24V 1
3k
545
V
OUT = 8.06V



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