Yufeng Microelectronics Dual N MOS YFW8205Li SOT23-6 for Xiaomi Walkie-Talkie Products

This article is sourced from eefocus on V2EX. If there is any infringement, please contact the author for timely removal. Remove the back clip, then use a prying tool to detach the back cover. Disconnect the internal battery interface and unscrew the bolts securing the PCB board to easily remove the mainboard. For detailed disassembly steps, refer to the video. After disassembly, you can observe the complete hardware configuration, which primarily includes a battery, a mainboard, and a casing.


The reason for specifically mentioning the walkie-talkie's casing is primarily because it also features a speaker and a frequency tuning encoder. As for the power supply battery of the walkie-talkie, it is a lithium battery with specifications of INR18650, 2000mAh, 3.6V, and 7.2Wh. GPHN, is this manufacturer familiar to everyone? It should be the battery from Penghui Energy, which is also a listed company. Now, let's take a closer look at the walkie-talkie's mainboard.

One side of the PCB motherboard includes the antenna of the walkie talkie, the contact interface of the speaker, and a large-sized polarized microphone.

And the main chips include:

PuRan Corporation's 8Mb SPI FLASH (P25080SH) is a listed company on the Science and Technology Innovation Board. With the recent global storage price surge, we can look forward to the company's future performance.

Yufengwei's dual N MOSFET (YFW8205LI) is a dedicated MOSFET for lithium battery protection.

CM1003-BFS, a single-cell lithium battery protection IC from Chuangxin Micro.

Shanghai Beiling's audio amplifier (BL6281G). Tuoer Micro's lithium-ion battery charging management chip (TMI4056E).

Let's take a look at the circuit on the other side of the PCB motherboard, including the Type-C charging interface, volume adjustment interface, encoder interface on the shell, and RGB LED light guide column made of transparent soft silicone.

The main chips on this side of the PCB board include:

Yufengwei's dual N MOSFET (YFW8205LI).

The low-power Bluetooth SoC with EP2T16 F40E silk screen printing and the RF amplifier chip with H0604A silk screen printing are not clear which specific manufacturer and model of chip they are. If you know, please leave a message to inform us.

The dedicated RF transceiver chip (BK4819) for walkie talkies integrated by Broadcom, together with the RF power amplifier chip, forms the receiving circuit and transmitting circuit of the walkie talkie.