Data Sheet

4. In the Device menu, select “Upgrade firmware…”. You will see a message asking you if you

are sure you want to proceed: click OK. The Tic will now disconnect itself from your computer,

go into bootloader mode, and reappear as a new device.

5. Once the Tic is recognized by the computer, the green LED should be blinking in a double

heart-beat pattern.

6. Go to the window titled “Upgrade Firmware” that the Tic Control Center opened. Click the

“Browse…” button and select the firmware file you downloaded.

7. If it is not already selected, select the device you want to upgrade from the “Device” dropdown

box.

8. Click the “Program” button. You will see a message warning you that your device’s firmware

and settings are about to be erased and asking you if you are sure you want to proceed: click

OK.

9. It will take a few seconds to erase the Tic’s existing firmware and load the new firmware.

10. Once the upgrade is complete, the Upgrade Firmware window will close, the Tic will

disconnect from your computer once again, and it will reappear as it was before. If there is

only one Tic plugged into your computer, the software will connect to it. Check the firmware

version number and make sure that it now indicates the latest version of the firmware.

11. If you saved your settings, you can restore them now by using the “Open settings file…”

option in the “File” menu and clicking “Apply settings”.

If you run into problems during a firmware upgrade, please contact us [https://www.pololu.com/contact]

for assistance.

5.7. Logic power output (5V)

The Tic’s 5V (out) pin provides access to the board’s 5V logic supply, which comes from either

the USB 5V bus voltage or a 5V regulator powered by VIN, depending on which power source is

connected. If power is supplied via VIN and USB at the same time, the Tic uses VIN.

The 5V regulator on the Tic T825 is a low-dropout (LDO) linear regulator. The amount of heat

generated by a linear regulator is proportional to the voltage drop from the output to the input multiplied

by the output current (which equals the input current). The other main heat-generating component of

the Tic T825 is its DRV8825 driver, which generates heat in proportion to the current it is supplying

to the stepper motor coils. Therefore, to figure out how much current you can draw from the 5V pin

without overheating the regulator, you have to consider two factors: the VIN voltage and the Tic’s

configured motor current limit. The table below shows how much current you can draw from the Tic’s

5V pin at room temperature for various combinations of input voltage and stepper motor current, not

including the current drawn by the Tic itself:

5. Details Page 80 of 150