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As of 2025-07-24

TWELITE (SMD)

Questions about the TWELITE Series (SMD Module)

This page compiles questions related to the TWELITE Series (SMD Module).

Hardware

Which pins should be brought out for firmware writing or setting changes?

You need to have the TWELITE R3 in a connectable state.

Therefore, please bring out the seven pins listed in the TWELITE R3 datasheet.

R3 GND #1 -> SMD #20 #28 #30 #31 #32 / GND
R3 TXD #2 -> SMD #8 / TX
R3 PRG #3 -> SMD #2 / PWM3
R3 RXD #4 -> SMD #9 / RX
R3 RST #5 -> SMD #21 / RST
R3 VCC #6 -> SMD #5 / VCC
R3 SET #7 -> SMD #13 / DI1

SET is not mandatory.

However, devices such as the TWELITE CUE that involve sleep modes perform a reset with the SET pin held low to wake the device before settings are applied.

What should I do if the device overheats during use, stops working, or fails?

It is possible that the device is affected by static electricity or electromagnetic noise.

Except for the radio section, TWELITE’s basic I/O pins are directly connected to semiconductors. Therefore, in environments with significant static electricity or electromagnetic noise, failure may occur without proper countermeasures.

Please take necessary measures such as enclosing everything except the antenna in a metal case or inserting a 3.6V Zener diode. Please note that we do not provide support for individual cases related to noise countermeasures.

Can it be reflowed twice?

No, it cannot.

Since the semiconductor chips are reflowed onto the board once during TWELITE manufacturing, the reflow count for the TWELITE module is one time only.