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MAX6639F Datasheet(PDF) 5 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) 5 Page - Maxim Integrated Products

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data is logged each time Read All is selected from the
Options menu bar. To stop data logging, uncheck the
Data Logging checkbox.
Temperature
The MAX6639 monitors its own die temperature and the
junction temperature of one external diode-connected
transistor, or the junction temperature of two external
diode-connected transistors. The temperature mea-
surements are capable of either 8-bit or 11-bit (extend-
ed) resolution; 8-bit resolution results in a temperature
resolution of 1°C/LSB. Extended resolution results in a
temperature resolution of 0.125°C/LSB and is enabled
by checking the Enable Extended Resolution (0x05)
checkbox (Figure 1).
Read the temperatures by pressing the Read buttons
within the Temperature tab sheet (Figure 1). The tem-
perature is shown to the right of the buttons.
External Diodes
The MAX6639AEE remote temperature sensor is opti-
mized for use with a diode-connected transistor whose
ideality factor is equal to 1.008. Transistors with different
ideality factors produce different remote temperature
readings. Some typical discrete transistors may produce
readings that vary approximately 3°C from the correct
value. Refer to Application Note 1057:
Compensating for
Ideality Factor and Series Resistance Differences Between
Thermal Sense Diodes for additional information.
ALERT, THERM, and OT
Temperature Limits
The MAX6639 has
ALERT, THERM, and overtempera-
ture (
OT) limit registers. Temperatures exceeding the
ALERT limit register generate an alert interrupt.
Exceeding the
THERM or OT limits sets the THERM or
overtemperature bit in the status register and asserts
the
THERM or OT output pin.
Read a limit by pressing the Read button (Figure 1). The
value (in Celsius) is shown to the right of the button.
Change a limit by entering the value (in Celsius) into the
appropriate edit field and pressing the Write button.
MAX6639 Evaluation Kit
_______________________________________________________________________________________
5
Figure 2. MAX6639 EV Kit Software Main Window (Global Configuration Tab)


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