Disassembling the portable WIFI, ZTE Micro's complete solution.
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A friend sent me a portable WIFI.
The full name is TD-LTE wireless data terminal. As the name suggests, it is a 4G card (or possibly esim) that can create a wifi hotspot to connect mobile phones, laptops, etc. The brand is Xuntang, model MZ34A.
The charging port is Type-C, with a charging power of 5V2A. There is a power button.
As soon as I opened the back cover, I found that the workmanship was pretty good. The battery used is this packaged flat lithium battery with a capacity of 2100mAh.
After removing the screws and taking off the front cover, I found that the circuit board was only half the size. The black immersed PCB looks well made.
This portable WIFI is indeed using an esim card. The circuit module on the right is the AIC8800DW and its peripheral circuits. The AIC8800DW is a Wi-Fi6/ BT 5.2 combined MCU from AIC Micro. It supports WLAN and BT functions and meets the IEEE 802.11 a/b/g/n/ac/ax standard protocol requirements.
The PCB antenna routing of the AIC8800DW is quite cute.
On the back of the board are the RST button, battery connector, antenna shrapnel, etc. The main circuit is under the shielding shell.
Apply some heat first to remove the sticker.
Continue blowing and you can remove the shielding shell. Be careful when taking it off. If you are not careful, all the devices inside will be destroyed.
After removing the shielding shell, I found that the layout and wiring density below is quite high.
The baseband chip ZX297520V3 comes from ZTE Micro. This chip realizes the multi-mode digital baseband chip with LTE/WCDMA/TD-SCDMA/GSM modem functions. It contains two A53 processors, a DSP processor, and an M0 processor. It can support data throughput of 150Mbps downlink and 50Mbps uplink (peak rate). In addition to I2C\I2S\UART and other peripherals, there is also a USB2.0 controller, which looks very powerful.
The RF transceiver chip ZX234230A next to it also comes from ZTE Microelectronics.
The ZX234296 from ZTE Microelectronics is a PMIC power management chip. There are four inductors placed on the periphery, and it seems that there are 4 BUCK outputs. The TP4056 nearby is a lithium battery charging chip. The maximum charging current of this chip is 1A, so even a 5V2A charger cannot reach a charging power of 10W. I have seen that some other portable WiFis use lithium battery charging management chips with path management, and the TP4056 is obviously not a low-cost solution that does not support path management.
The Flash memory chip model is 25LQ64AWJG, but I can't tell who it is.
After the antenna is led out to the edge of the board, it is connected to the contact point of the soft antenna through the antenna spring.
The antenna is just this small.
Generally speaking, this portable WiFi is no different from other portable WiFi in terms of baseband and radio frequency solutions. However, the solution used in the lithium battery charging management chip is slightly inferior, and this product does not have a screen, there are only a few indicator lights for human-computer interaction, and it does not have a SIM card slot. But the biggest advantage is that it is light, small, and portable enough to be called a portable WiFi.
Author: Electronic Development Learning
Source: Electronic Development Learning
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