Datasheet

Maxim Integrated │ 4
MAX31790 Evaluation Kit Evaluates: MAX31790
www.maximintegrated.com
4) Ensure that jumpers/shunts J101, J201, J301, J401,
J501, and J601 are installed, which connects the asso-
ciatedPWMOUTsignaltotheFan1–Fan6headers.
5) Connect a 3.3V power supply to the VCC and GND
banana jacks.
6) Connecta12VpowersupplytotheVFANandGND
banana jacks.
7) Prior to starting the GUI, connect the EV kit hard-
ware to a PC using the supplied mini-USB cable, or
equivalent.TheCOMLED(D2l)shouldberedand
slowly flash orange.
8) Windows should automatically begin installing the
necessary device driver. The USB interface of the
EV kit hardware is configured as an HID device and
therefore does not require a unique/custom device
driver. Once the driver installation is complete, a
Windows message appears near the System Icon
menu indicating that the hardware is ready to use.
Do not attempt to run the GUI prior to this message.
If you do, then you must close the application and
restart it once the driver installation is complete. On
some versions of Windows, administrator privileges
may be required to install the USB device.
9) Once the device driver installation is complete,
visit www.maximintegrated.com/evkitsoftware to
download the latest version of the EV kit software,
MAX31790EVKitSoftware.zip. Save the EV kit soft-
ware to a temporary folder.
10) Open the .ZIP file and extract the .EXE file to your
desired location. The .EXE file is the actual EV kit
GUI and not an install program. You can store the
.EXE wherever you like and then uninstall it later by
simply deleting the .EXE file.
11) Double-click on the .EXE file to run the GUI. A
message box stating The publisher could not be
verified. Are you sure you want to run this soft-
ware? may appear. If so, click Run.
12) When the GUI appears, proper communication to
the USB-to-I
2
C master is indicated in the lower right
corner below the Status box by a text string stating
DS3900 Connected
.TheCOMLED(D2l)nowturns
off and flashes red when communication occurs.
13) To verify communication to the device, with the
default jumper/shunt settings described in steps 2–4,
press the UpdateDashBoard button on the top right
corner and verify the PWM Frequency updates to
25kHz and all Duty Cycle values
updateto75.15%,
as shown in Figure 1. This completes the EV kit
setup. The hardware and software are ready to begin
evaluating the device. If any issues arise, see the
Troubleshooting section.
Detailed Description of Software
GUI Status Box
On the bottom right side of the GUI is the Status group
box. It is used to relay information to the user and is
cleared with the associated Clear Button. The text box
below the Status label indicates the status of the com-
munication between the GUI and the EV kit hardware.
If everything is working properly, a message indicates
DS3900 Connected; otherwise, the display shows a yield
sign and DS3900 Disconnected!!
Device Conguration
Upon successful completion of the setup procedure,
the user is ready to begin evaluation of the device. The
device’s POR behavior is set by the power-up configura-
tion pins and the default POR values, as defined in the
MAX31790 IC data sheet. The USB-to-I
2
C master com-
municates to the Slave ID (hex) shown in the DashBoard
in the upper right side of the GUI. To change the target
slave address, enter the new value into the input field and
press the Set button.