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MAX6639F Datasheet(PDF) 10 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) 10 Page - Maxim Integrated Products

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MAX6639 Evaluation Kit
10
______________________________________________________________________________________
Figure 5. MAX6639 EV Kit Software Main Window (Fan Controls | Fan 1 | Tachometer Tab)
externally or by the temperature exceeding the
THERM
limit—forces the fan to full speed at the rate determined
by the rate-of-change setting in configuration 1.
Pulse stretching is used with a pulse-modulated power
supply powering the fan. When modulating the fan’s
power supply with the PWM signal, the PWM pulses are
periodically stretched to keep the tachometer’s signal
available for one full revolution. Check the Pulse
Stretching Disable checkbox to disable this feature.
Always disable pulse stretching when using 4-wire fans.
The PWM Frequency drop-down list sets the frequen-
cy that drives the pulse-modulated power supply. The
frequency can be set to 20Hz, 33.33Hz, 50Hz, or
100Hz. If the High Freq. Enabled (MAX6639 only)
checkbox is checked within the Global Configuration
tab sheet, then the frequency can be set to 5kHz,
8.33kHz, 12.5kHz, or 25kHz.
Read the configuration 3 register by pressing the Read
button. Change the configuration by selecting the
desired options and pressing the Write button.
Fan 1 and Fan 2 Tachometer Count
The fan 1 Tachometer Count (0x20) and fan 2
Tachometer Count (0x21) group boxes control the dif-
ferent tachometer counts (Figure 5). The Tachometer
Count (0x21) group box is not shown, but can be
accessed by navigating to the Fan 2 tab sheet from
Figure 5. The tachometer count value is inversely pro-
portional to the fans’ speed.
Read the tachometer count by pressing the Read button.
Fan 1 and Fan 2 Start or Target
Tachometer Count
The fan 1 Start or Target Tachometer Count (0x22)
and fan 2 Start or Target Tachometer Count (0x23)
group boxes set either the starting tachometer count for
the fan when operating in automatic RPM mode, or the
target tachometer count when operating in manual
RPM mode (Figure 5). The Start or Target Tachometer
Count (0x23) group box is not shown, but can be
accessed by navigating to the Fan 2 tab sheet from
Figure 5. Read the count by pressing the Read button.


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