Evaluates: MAX6629—MAX6632
MAX6629 Evaluation Kit
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and create icons for them in the Windows 95/98/
2000 Start menu. An uninstall program is included
with the software. Click on the UNINSTALL icon to
remove the EV kit software from the hard drive.
3) Connect the +7V to +20V supply to the pads labeled
VIN and GND.
4) Turn on the power supply.
5) Start the MAX6629 program by opening its icon in
the Start menu.
6) Observe as the program automatically detects the
MAX6629 and starts the main program.
Detailed Description
Figure 1 is the main display for the MAX6629 EV kit.
User-Interface Panel
The user interface is easy to operate. Use either the
mouse or the Tab key to navigate. Note: Words in bold
face are user-selectable features in the software.
The program continually polls the device for new tem-
perature data. To disable the continuous polling of
data, uncheck the Automatic Read checkbox. Press
Read Temp to get the current temperature.
Data Logging
Check the Data Logging checkbox to activate data
logging. Data logging saves temperature and status
data to a text file that includes a time/date stamp next
to each data point. If Automatic Read is enabled, data
is sampled at 1Hz; however, the data is logged to the
file only if the temperature changes. This slows the
growth of the data-logging file. When Automatic Read
is disabled, the data is logged each time the Read
Temp button is clicked. To stop data logging, uncheck
the Data Logging checkbox.
General-Purpose SPI Utility
There are two methods for communicating with the
MAX6629: through the user-interface panel or through
the general-purpose SPI utility. This utility (Figure 2)
configures SPI parameters such as clock polarity
(CPOL), clock phase (CPHA), and chip-select (CS)
polarity.
The fields where pin numbers are required apply to the
pins of the parallel port connector.
The utility handles the data only in byte (8-bit) format.
Data longer than a byte must be handled as multiple
bytes. For example, a 16-bit word should be broken
into two 8-bit bytes.
To write data to the slave device, enter the data into the
field labeled Data bytes to be written. Each data byte
should be hexadecimal, prefixed by 0x, and separated
with a comma. Press the Send Now button to write the
data to the slave. Note: The MAX6629 is a read-only
device and cannot be written to.
To read data from the slave device, the field Data bytes
to be written must contain hexadecimal values. Include
the same number of bytes as to be read from the slave.
For example, to read 16-bit data from the MAX6629,
2 bytes must be written, each prefixed by 0x and sepa-
rated by a comma (default is 0x00, 0x00). Note: When
using the SPI utility, uncheck the Automatic Read
checkbox in the main display (Figure 1).
Figure 1. Main Display for MAX6629 EV Kit
Figure 2. SPI Utility Showing the Settings to Communicate with
the MAX6629 EV Kit
