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USB HID Communications Module

DS3900P2

Troubleshooting

AlleffortsweremadetoensurethattheDS3900P2works

on the first try, right out of the box. In the rare occasion

thataproblemissuspected,refertoTable4totrouble-

shoot the issue.

DS3900P2 Revisions

Revisions yielding significant changes and/or improve-

ments are tracked in firmware and are displayed in

most evaluation software provided by Maxim Integrated.

Revision is broken up into a major and minor revision.

For example, if the DS3900P2’s revision is 3.2, it returns

amajorrevisionof3,aminorrevisionof2.Knowingthe

revision allows the software to utilize new functions that

are not available in previous versions of the DS3900P2’s

firmware and to avoid using commands that are not

present in prior versions. Although there are no plans

to change the firmware at this time, Maxim Integrated

reserves the right to change the firmware at any time

without notice.

Intended Use

The DS3900P2 module is intended only to be used to

evaluate Maxim Integrated circuits. All hardware, firm-

ware, and any relative software is provided “as is”, without

warranty of any kind, express or implied, including, but

not limited to, the warranties of merchantability, fitness

for a particular purpose, and noninfringement. In no event

shall Maxim Integrated be liable for any claim, damages

or other liability, whether in an action of contract, tort or

otherwise, arising from, out of, or in connection with the

hardware, firmware, and any relative software or the use

or other dealings in the hardware, firmware, and any rela-

tive software.

Table 3. Description of LEDs

Table 4. Troubleshooting the DS3900P2

LED

COLOR

DESCRIPTION

D1 (POWER)

Green

USB Power Fault. The USB power is connected.

Red

USB Power Fault. A fault occurred due to overvoltage limit, current limit,

or thermal limit.

D2 (COM)

Green

Waiting. Software has initialized the hardware. Waiting for user data to be sent

fromtheGUI.

Red

Communication.Afterthesoftwarehasinitializedthehardware,theLEDflashes

red when a command from the PC is received.

Flashing Red and

Orange

Waiting. Hardware is powered on and waiting for the software to be opened

SYMPTOM

CHECK

SOLUTION

Windows does not

detect hardware.

Is the LED labeled D1

on the DS3900P2 red?

If yes, then the electronic fuse is in a fault state. Inspect for electrical shorts on the

PCB and ensure that the PCB is not sitting on a conductive surface.

USB cable and port?

Try connecting the USB cable to a different USB port on the PC and wait for a

Windows message that indicates that the hardware is ready to use. If the device is

not detected, unplug the USB cable and reboot the PC. Connect the USB cable.

Are any of the LEDs

illuminated?

If not, then the PCB may not be getting power. Ensure bias is applied to VCC and

allthreeGNDterminalsareconnectedtosystemground.VerifytheUSBcableis

connected to a PC.