【Meet friends by disassembling】Teardown of TI's Bluetooth speaker

qwqwqw2088

【Meet friends by disassembling】Teardown of TI's Bluetooth speaker [Copy link]

  This content was originally created by EEWORLD forum netizen qwqwqw2088. If you need to reprint or use it for commercial purposes, you must obtain the author's consent and indicate the source The speaker that I want to disassemble should have been a prize-winning item in an event held by the forum a few years ago when Bluetooth speakers were just starting to be launched on a large scale. It has good sound quality, is easy to carry, and has relatively low power consumption. I used it all the time at the beginning, but the novelty wore off for a while, and it kept gathering dust. When I remembered it, it was out of power, so I charged it, but it didn't take long for it to start gathering dust again. Later, it couldn't be charged after being left for a long time. I guess the battery had bulged, and then it just stopped working. I haven't had time to fix it since. Today I disassembled it to see what structure it has, what type of chip it has, and so on. Those who are interested in studying Bluetooth can refer to it. Let's take a look at the appearance first because I disassembled it a few days ago, and just after I opened it, I closed it and went out to do some work. So the picture below shows the one with the screws loosened

After removing the fastening screws, the various parts of the entire speaker are as follows

Because it can't be charged, I'm still concerned about the battery condition first. The battery does have some bulges, and it really can't be used anymore. If you replace the battery, it should still be usable.

The rest of the battery pack is intact but the workmanship is just average. It may be because it has been there for a long time. The yellow tape should be high-temperature tape, and it has cracked. Maybe it’s because it has been there for a long time? But they are all kept at home, never been to a place with a harsh environment, and not charged for a long time. The temperature should be usually at room temperature. The battery protection board also seems to be a little cracked (be very careful during the disassembly process)

Now that we have arrived at the battery protection board, the first part cannot be without this battery protection. Let’s see what the situation is

The battery protection chip, the font of the LOGO on the chip is really too small. I rummaged through the boxes and found the "national treasure-level" magnifying glass to see if I can see it clearly...

After repeatedly looking through the chip's LOGO and logo, I finally found that it is the commonly used DW01 and 8205A solution. The lithium battery protection IC overcharge detection voltage (VCU) of 4.3V is more commonly used. DW01, and then the lithium battery protection field effect tube (MOSFET) 8205A combined battery protection board,,,

The protection circuit schematic diagram of these two chips can be found on the Internet

This is also commonly used, the cost is not too high, and the stability is relatively good

qwqwqw2088

After reading about battery protection, let's take a look at the Bluetooth chip. The Bluetooth module used is CSR's 57e6 Bluetooth module. CSR (British Bluetooth chip manufacturer) CSR (Cambridge Silicon Radio) was founded in Cambridge, England in 1998. Its early technology was mainly in the audio field. It was listed on the London Stock Exchange in 2004. In January 2007, it acquired Nordnav Technologies and Cambridge Positioning Systems, and has been committed to software GPS systems. CSR is currently the largest global supplier of Bluetooth chips, with a market share of about 50%. It also provides WiFi and VoIP solutions. CSR's main competitor in the Bluetooth chip market is Broadcom. The memory chip used is Taiwan CFEON EON flash chip EN29LV040A

qwqwqw2088

Let's look at the other parts The headphone driver chip used is PT2308

qwqwqw2088

The rest is the power supply part. There is an octagonal chip but I can't really tell what it is...

Below are some interface boards, which are sealed with some yellow glue. They feel pretty firm to the touch.

The switch button board has a sealing ring to prevent water from entering and affecting the circuit operation...

qwqwqw2088

The rest is the speaker. I used the 4 ohm 3W LY4008A. The glue on the speaker cable plug is very strong. I tried to pull it out several times but it didn't come off. I guess the base was also glued together. This won't affect the line. The button part is also very simple in design, and it is relatively easy to operate. In general, the workmanship and assembly process is good, and the process quality of the production factory is not bad. There are still many places in the design that are worth learning and drawing lessons from.

goodluckone

Not bad! Why not use your own Bluetooth chip?

qwqwqw2088

goodluckone posted on 2018-7-9 13:25 Not bad! Why not use your own Bluetooth chip?

First, it was not produced by TI itself. TI's marketing department found a Chinese company to produce it. Second, TI also thinks that its own products are too expensive and not suitable for popular gifts. The first case is more common.