YuFeng Microelectronics' dual N MOS YFW8205Li SOT23-6 is used on Xiaomi walkie talkie products

If there is any infringement in this article, please contact the author in a timely manner to delete it. Remove the back clip and use the flip tab to remove the back cover. Then disconnect the internal battery interface and unscrew the screws on the fixed PCB board to easily remove the motherboard. The specific disassembly process can be seen in the video. After disassembly, the complete hardware solution can be seen, mainly including a battery, a motherboard, and a casing.

I specifically mentioned the casing of the walkie talkie because it also has a speaker and an encoder for frequency modulation. As for the power supply battery of the walkie talkie, the specification is INR18650 lithium battery, 2000mAh, 3.6V, 7.2Wh. GPHN， Are you familiar with this manufacturer? Should it be batteries from Penghui Energy or a listed company. Let's focus on the motherboard of the walkie talkie.

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.