Preface
Jiletang has launched a multi-port car Bluetooth transmitter with cable, which supports three music playback modes: Bluetooth , TF card, and AUX cable. The Bluetooth solution has been upgraded to stabilize transmission and audio is not distorted. Use a larger microphone to make the call clearer. Connecting it to the car charger through a 1.5mTPU spring wire can make the car clean and not messy.
car charging comes with 2 QC3.0 and 1 PD30W fast charging interface, supports three devices to charge simultaneously, and is compatible with PD3.0, QC3.0, PPS, Samsung AFC and Huawei FCP super fast charging protocol mainstream fast charging protocols, meeting the fast charging needs of most devices on the market.
charging head network has obtained the Jiletang multi-port car Bluetooth transmitter. Let's disassemble it below to see how the car charger and Bluetooth module are designed inside .
machine Letang car Bluetooth transmitter appearance
machine Letang This multi-port car Bluetooth transmitter with cable consists of two parts. A power supply line is drawn from the side of the traditional car charge fuselage to power the Bluetooth transmitter.
car charger uses a plastic shell made of PC material, with a matte surface and anti-fingerprint. The two sections of the body are rounded, and one side is printed with the JOYROOM brand logo. The other side of
car charger parameters are printed.
Product parameters close-up
Model: JR-CL18
Input: 12-24V
PD Output: 5V3A, 9V3A, 12V2.5A, 15V2A, 20V1.5A
PPS: 3.3-11V3Ahtml l5
UBS-1/2: 5V3A, 9V2A, 12V1.5A
USB-1+USB-2 output: 5V4A
PD+USB-1/2 output: 5V4A
Total output: 30W
Product has passed UKCA, FCCh, and CE certification .
car charger is equipped with a 2A1C interface, and an RGB light ring is also installed on the edge to improve the user experience.
spring wire close-up.
cable is bending-resistant.
Bluetooth module control panel has multiple function buttons, and a knob can be pressed in the middle to be used for phone function. The side of the
Bluetooth module is a TF card slot and a 3.5mm audio output interface, which can be used by wired connection to the linear input interface.
microphone opening close-up.
audio output interface close-up.
TF card slot close-up. There is a fixing clip on the back of
.
cable straightened and the measured length was about 1.5 meters.
product is directly hung in hand. The total weight of
product is about 95g.
is turned on and the RGB light ring on the edge of the top surface of the car charger will light up. The RGB light ring at the edge of the knob will also light up. The LED screen displays the current FM transmission frequency. You need to adjust the car's radio to the same frequency and receive Bluetooth audio signals. When
simulates 14V DC input, the USB-A1 port is measured to support Apple 2.4A, Samsung 5V2A, DCP protocols, as well as QC2.0/3.0, AFC, and FCP fast charging protocols using ChargerLAB POWER-Z KT002.
It is measured that the USB-A2 port also supports QC2.0/3.0, AFC, and FCP fast charging protocols.
It is measured that the USB-C port supports QC2.0/3.0, AFC, FCP, PD3.0, and PPS fast charging protocols.
and has three sets of fixed voltage gears, 5V3A, 9V3A, 12V2.5A, and a set of PPS voltage gears, 3.3-11V3A.
simulates 24V DC input, it is measured that the USB-A1 port supports Apple 2.4A, Samsung 5V2A, DCP protocols, as well as QC2.0/3.0, AFC, and FCP fast charging protocols.
measured that the USB-A2 port compatibility protocol is the same as that of A1 port.
It is measured that the USB-C port also supports QC2.0/3.0, AFC, FCP, PD3.0, and PPS fast charging protocols.
and has five sets of fixed voltage gears, 5V3A, 9V3A, 12V2.5A, 15V2A, 20V1.5A, and a set of PPS voltage gears, 3.3-11V3A.
Jiletang car Bluetooth transmitter disassembly
After gaining a basic understanding of Jiletang's multi-port car Bluetooth transmitter with wire, we will continue to disassemble it in detail to see how the materials are used.
First unscrew the back cover of the Bluetooth module and fix it with the Bluetooth module through four screws. The memory card slot and 3.5mm headphone jack are soldered on the PCB inside the
case, connected to the wires of the car charging, and provide 5V and 12V power supply to the Bluetooth module.
PCB is fixed inside the shell by screws.
connector is used to connect buttons and knobs on the front of the housing.
Unscrew the screws that fix the PCB, weld the four keys on the edge of the PCB, and the keys corresponding to the cover plate are LED digital tube in the middle, which is used to display the FM transmission frequency.
translucent cover is used for light transmission, displaying the current FM emission frequency.
leads out of the vehicle charge to the Bluetooth module's wires, where GND and 5V are used for power supply and 12V is used for FM signal transmission.
removed all the circuit boards, soldered the call microphone, connected the connector to the key board, and
soldered an micro switch on the front of the small board. On the back of
is a micro switch that detects rotation left and right. Close-up of the plug connected to the motherboard.
PCB front welding 3.5mm audio socket, four function buttons, LED digital tube and LED indicator .
solder the TF card slot, Bluetooth receiver chip, FM transmitting chip and other devices on the back.
electret microphone close-up, used for call function, jacket rubber cover seal.
electret microphone welding wire connection. Close-up of socket of
connection button small board.
.5mm socket adopts sediment plate welding.
TF card slot close-up.
Bluetooth Main control chip comes from JL Jieli, silk screen BP0F441-26A4. Bluetooth antenna printed in the clearance area on the motherboard.
provides clock chip oscillator for Bluetooth master chip.
FM transmitting chip comes from Kuntianke, model QN8027. It is a high-performance digital FM transmitting chip for portable devices, used in portable players, automotive accessories and other handheld device applications. It supports transmission frequencies of 76 to 108MHz and has stereo audio input and RF output. Close-up of the function keys at the edge of
PCB, using patch welding.
88.8 digital tube close-up, silkscreen JC2441B. After reading the disassembly of the Bluetooth module, I will disassemble the car charging part.
pry off the front panel of the car charger. The back of the panel is the dust cover of the interface and the light guide strip on the side.
Close-up of screws and LED indicators that fix the car charging PCB.
unscrew the fixing screws and remove the internal PCBA module of the car charger.
two negative electrode contacts are solid metal, and they contact the cigarette lighter shell through the shrapnel support on the PCB.
The wire connecting to the Bluetooth module is soldered to the vertical small board.
car charge PCBA module list, consisting of two small boards welding, and two buck inductors and filter capacitors are welded on the front. The back of
solder the step-down chip and a filter capacitor, and cover the insulation of the barley paper.
car charger has a 2A1C interface, and both the front and back sides are equipped with capacitors filtering.
car charge positive spring is welded enameled wire to reduce the resistance.
positive input powers the two-channel buck chips through fuse and filter inductance .
3μH Close-up of the step-down inductor.
car charge Bluetooth module powered by Chengxin Micro CX8823, which is a step-down chip with built-in power tube. The input withstand voltage reaches 32V, supports 3.1A output current, no external compensation circuit is required, and the peripheral circuit is simple, and it is used for 5V power supply of Bluetooth module with a 33μH inductor.
left side 100μF 16V electrolytic capacitor is used for 5V output filtering, and 100μF 35V electrolytic capacitor is used for input filtering.
car charge negative electrode shrapnel close-up.
is behind the negative electrode shrapnel. It is a magnetic ring inductor wrapped in , which is used for USB-C and USB-A port output buck.
Paste a piece of barley paper under the filter capacitor for insulation.
The step-down chip used for USB output uses Xintan Micro NDP1460QB, which is a synchronous step-down converter with 38V input voltage and 6A continuous output current. It has a built-in 14mΩ synchronous step-down tube, supports dual constant voltage and constant current control, and has a built-in compensation component. It uses a heat-enhanced QFN5*5 package.
output filter capacitor specification is 100μF 35V.
car charge 2A1C output interface close-up, between the two USB-A ports is the output current sensing resistor of each interface.
protocol chip uses cloud silicon semiconductor XPD977, and the output voltage of 2A1C ports is all controlled by this chip. XPD977 has passed USB PD3.0 certification, TID: 5594. Supports XPD-LINK multi-chip interconnection communication technology; supports fast charging protocols such as QC2.0/3.0/3.0+, AFC, FCP, SCP, HVSCP, PD and PPS, and also supports Xiaomi CHARGE TURBO 27W protocol, Huawei 10V high-voltage SCP protocol, etc.
Cloud Silicon Semiconductor XPD977 integrates an internal 10mΩ VBUS path power switch tube, and integrates a 10mΩ current sense resistor, and has built-in VPWR and VBUS dual discharge paths. Supports complete protection functions, saves the number of peripheral components, simplifies circuits, and reduces costs. Includes QFN5*5-32 package.
charging head network disassembled and learned that Yunsi semiconductor XPD series fast charging protocol chips have been adopted by dozens of products from multiple brands such as Bull , Belkin , Lenovo , Nokia , Philips , Aoji, 3 Bissi , Pinsheng, Momis and other brands. Seizing the 20-30W PD fast charging outlet, Fuman Group Yunsi semiconductor's single-month PD protocol chip sales exceeded 10 million.
Silk 3419 PMOS tube is used for USB-A port output control.
has two corresponding two USB-A ports, realizing a fast charging strategy of single-port fast charging and multiple-port output 5V.
light blue USB-A interface close-up.
Another USB-A port is light blue.
USB-C mother base via welding fixation.
is used for power indicator LED lights, soldered at the edge of the interface small board. All
has been disassembled, let’s take a family photo.
charging head network disassembly summary
machine Letang This multi-port car Bluetooth transmitter with cable adopts a split design. The vehicle charger and Bluetooth transmitter are connected by cables, so that the Bluetooth transmitter can be placed in a convenient place for operation, making it more convenient to use. The car charger has three output interfaces: 2A1C, the USB-C port supports 30W fast charging, and the USB-A port supports 18W fast charging, meeting the daily fast charging needs.
charging head network learned through disassembly that this product uses Xintan micro synchronous step-down chip with Yunsi XPD977 protocol chip for three-port fast charging output, and uses Chengxin micro CX8823 step-down chip to power the Bluetooth module. The Bluetooth module uses a Jieli Bluetooth chip for Bluetooth hands-free function, and has a built-in FM transmitting chip and 3.5mm output interface to meet the use of Bluetooth audio functions of different vehicles.
