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MAX6639F Datasheet(PDF) 7 Page - Maxim Integrated Products

Part No. MAX6639F
Description  Evaluation Kit
Download  18 Pages
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
Logo MAXIM - Maxim Integrated Products

MAX6639F Datasheet(HTML) 7 Page - Maxim Integrated Products

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of Change drop-down list, audibility of fan-speed
changes can be traded for response time. There are
eight possible options: 0s, 0.0625s, 0.125s, 0.25s,
0.5s, 1s, 2s, or 4s.
The Control drop-down list sets the temperature chan-
nels that control the fan in RPM mode. There are four
options under the control drop-down list: None,
Channel1, Channel2, or Both. Selecting None allows
for manual control of the fan’s RPM. Selecting Channel1,
Channel2, or Both, allows the fan’s RPM to be con-
trolled by the temperature of the selected channel(s).
The RPM Range drop-down list scales the tachometer
counter by setting the maximum (full-scale) value of the
RPM range. There are four possible selections: 2000
RPM, 4000 RPM, 8000 RPM, or 16000 RPM. Select the
closest value that is greater than the fan’s full-speed RPM.
Read the configuration 1 register by pressing the Read
button. Change the configuration by selecting the
desired options and pressing the Write button.
Fan 1 and Fan 2 Configuration 2A
The fan 1 Configuration 2A (0x11) and fan 2
Configuration 2A (0x15) group boxes apply to the
automatic RPM mode (Figure 4). The Configuration 2A
(0x15) group box is not shown, but can be accessed
by navigating to the Fan 2 tab sheet from Figure 4.
These group boxes contain four items: RPM step-size
A, Temp step-size, Positive PWM Polarity, and Min.
The RPM step-size A drop-down list selects the number
of tachometer counts that the target value decreases for
each temperature-step increase above the fan-start
temperature. The value can be set between 1 and 16.
The Temp step-size drop-down list selects the temper-
ature adjustment for fan control. For each temperature-
step increase, the target tachometer count decreases
by the value of RPM step-size A. The temperature step-
size value can be set to 1 C, 2 C, 4 C, or 8 C.
The Positive PWM Polarity checkbox sets the PWM
output polarity. Checking the Positive PWM Polarity
MAX6639 Evaluation Kit
Figure 3. MAX6639 EV Kit Software Main Window (Mask Tab)

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