Datasheet

4 Maxim Integrated
Evaluates: MAX15500/MAX15501
MAX15501 Evaluation Kit
SPI is a trademark of Motorola, Inc.
12) Turn on the power supply.
13) Start the MAX15501 EV kit software by opening its
icon in the Start | Programs menu. The EV kit soft-
ware main window appears, as shown in Figure 1.
14) Wait approximately 5s for the program to automati-
cally detect the EV kit.
15) Press the Set button in the DAC group box to set the
DAC output to 0V.
16) Uncheck the Disable Analog Output (OUTDIS)
checkbox to enable the MAX15501.
17) Select 101: Bipolar Voltage: Q10V in the Mode
drop-down list.
18) Use the voltmeter to verify that the output voltage on
pin 1 of J3 is approximately -12V.
19) Move the scrollbar in the DAC group box all the way
to the right and press the Set button (DAC full scale
output = +2.5V).
20) Use the voltmeter to verify that the output voltage on
pin 1 of J3 is approximately +12V.
Detailed Description of Software
The main window of the evaluation software is shown in
Figure 1. The software can be used to control both the
on-board 16-bit DAC and the MAX15501.
DAC
In the DAC group box, use the scrollbar to set the 16-bit
DAC data. The adjacent edit box at the left of the scroll-
bar displays the equivalent expected output-voltage
values of the on-board DAC. The user can also set the
output-voltage values of the DAC by typing the desired
voltage value in the edit box and pressing the Enter key.
Press the Set button to update the DAC output.
Configuration
The Configuration group box has all the controls for the
MAX15501.
To set the operating mode of the MAX15501, select the
appropriate mode in the Mode drop-down list.
The Brown out Threshold drop-down list sets the
brownout threshold for error reporting.
When evaluating the MAX15501 on the MAX15501 EV kit,
select the 2.5V option from the FS Select drop-down list.
Select the 4.096V option in the FS Select drop-down list
when evaluating the MAX15500 on the MAX15501 EV kit.
When the 20% above FS option is selected in the
FS Mode drop-down list, the FSMODE pin of the
MAX15501 is set to logic-low, which sets the output volt-
age to120%FS when the input voltage is equal to the full-
scale value. When the 5% above FS option is selected
in the FS Mode drop-down list, the FSMODE pin of the
MAX15501 is set to logic-high, which sets the output
voltage to 105%FS when the input voltage is equal to the
full-scale value.
Check the Thermal Self Protect checkbox to turn on the
thermal protection of the MAX15501.
Uncheck the Disable Analog Output (OUTDIS) check-
box to set the OUTDIS pin to logic-high and enable
the output of the MAX15501. To disable the output of
the MAX15501, check the Disable Analog Output
(OUTDIS) checkbox.
Press the Read button in the Configuration group box
to read the settings.
Status
In the Status group box, the Read Back Error group
box displays the fault conditions from the readback error
register of the MAX15501. The Flag group box displays
the status of the ERROR and the READY pins. Press the
Read button to update the Status group box. Check the
Automatic Read checkbox to automatically update the
Status group box every second.
During power-up, ERROR can go low and the brownout
register is set. Users need to read out the error register
twice to clear all the error register bits and reset ERROR
to high.
Read/Write Command
The Read/Write Command group box displays the last
command and data sent or received from the MAX15501
or the on-board DAC.
To send an SPIK command to the MAX15501 or the on-
board DAC, click on the appropriate radio button, enter
the SPI command (hex value) in the MOSI Data edit box,
and press the Send Command button.