BK3266 IC Board Internal Circuit Details

BK3266 IC Board Internal Circuit Details 

Board Number: YLD-KDS01

1. CPU (Central Processing Unit):
CPU Number: BK3266L
CPU Serial Number: EU2142DC
CPU Brand: BEKEN
Total Output Pin: 32 Pin
The CPU is the brain of your circuit, managing and processing all the instructions that drive the board's operation. The BK3266L is a microcontroller unit (MCU) produced by Beken, a company known for its wireless communication ICs and Bluetooth solutions.

The 32-pin configuration of the CPU indicates that it has multiple input/output (I/O) ports, allowing it to interface with various peripherals. These pins are likely connected to different components of the board, such as sensors, actuators, and communication modules. Each pin can be assigned a specific function, like digital input, analogue input, PWM output, or communication protocols like I2C, SPI, or UART.


The role of the CPU on this board is likely related to processing data from inputs, executing control algorithms, and managing communication between different parts of the system. The Beken CPU, particularly the BK3266L, may be optimized for low-power wireless communication, possibly supporting Bluetooth functionalities, making it ideal for applications like wearable devices or wireless audio systems.

2. Crystal Oscillator:
Crystal Frequency: 26 MHz
Crystal IC Total Output Pin: 4
A crystal oscillator provides a stable clock signal for the CPU. The 26 MHz frequency indicates the speed at which the clock cycles. This frequency is essential for timing control in the system, as the CPU uses it to synchronize its operations.

In your board, the crystal has 4 pins, which suggests it might be connected in a configuration that ensures stability and precision. Typically, two pins are for the input and output of the crystal signal, while the other two could be connected to capacitors or ground to fine-tune the frequency. The stability of this clock signal is crucial, as it affects the timing and performance of the entire system.

3. Vibrator:
Vibrator Voltage: 3.7V
Vibrator Control Transistor Number: J3Y
Transistor Total Output Pin: 3 Pin
The vibrator likely refers to a small motor used for haptic feedback in devices like smartphones or wearables. It operates at a voltage of 3.7V, which is a common voltage for lithium-ion batteries, suggesting that the vibrator is powered directly by the battery.

The control transistor, J3Y, is a small-signal NPN transistor commonly used for switching and amplification. The three pins of this transistor are the collector, base, and emitter. The base receives a control signal from the CPU or another logic circuit, and when this signal is active, it allows current to flow from the collector to the emitter, thus powering the vibrator. This setup allows the CPU to control when the vibrator is activated, possibly as a response to user input or a specific event.
4. Charging Section:
Charging Input Voltage: 5V
Charging Input Current: 0.2 - 2A
Charging IC Number: LTH7R
Charging IC Total Pin: 5
Charging Control IC Number: FlAF
Charging Controller IC Total Pin: 5
The charging section is responsible for managing the charging of the battery.

Charging Input Voltage & Current: The input voltage of 5V is standard for USB charging. The current range of 0.2A to 2A suggests that the device can handle various charging currents, possibly adjusting to different power sources or stages of charging. For example, a higher current (closer to 2A) might be used for faster charging when the battery is low, while a lower current (0.2A) might be used for trickle charging as the battery nears full capacity.

Charging IC (LTH7R): This IC likely handles the regulation of power from the charging source to the battery, ensuring that the voltage and current levels are appropriate. It could include features like overcharge protection, thermal management, and charging status indicators. With 5 pins, the IC might have connections for power input, ground, battery output, and possibly some control or feedback pins.

Charging Control IC (FlAF): This IC might be responsible for managing the charging logic, such as switching between different charging modes, monitoring battery status, and communicating with the CPU. Like the charging IC, it also has 5 pins, suggesting a compact design where control signals and power management functions are integrated.
5. Battery Section:
Battery Model Number: XD 481035
Battery Designation Number: 11CP5/11/38
Battery Normal Voltage: 3.7V
Battery Normal Current: 150 mAh
The battery section stores and supplies power to the entire circuit.

Battery Model & Designation Numbers: These numbers are specific to the manufacturer and provide information about the battery's dimensions, chemistry, and capacity. The numbers "481035" and "11CP5/11/38" likely refer to the physical dimensions of the battery (48mm x 10mm x 35mm) and its classification according to certain industry standards.

Battery Voltage & Current: A voltage of 3.7V is typical for lithium-polymer (Li-Po) or lithium-ion (Li-Ion) batteries, which are widely used in portable electronics due to their high energy density and relatively flat discharge curve. The 150 mAh capacity indicates that the battery can deliver a current of 150 milliamps for one hour before being fully discharged. This capacity, while modest, is suitable for low-power applications, possibly for wearable devices or small handheld gadgets.

Basic Operation:
All these components work together to create a functional electronic device. The CPU acts as the central controller, executing instructions and managing the operation of peripherals like the vibrator and the charging circuitry. The crystal oscillator ensures that all these operations are synchronized with a stable clock signal. The battery supplies the necessary power, while the charging section manages the safe recharging of the battery when connected to a power source.

The design of the circuit is likely optimized for low power consumption, given the modest battery capacity and the inclusion of components like a 26 MHz crystal and small transistors. This suggests a focus on efficiency, making the device suitable for applications where battery life is crucial, such as in wearable electronics, Bluetooth headsets, or small IoT devices.

The specifications also indicate that the device is designed to handle varying charging conditions, which is important for ensuring safety and longevity in portable electronics. The use of both a charging IC and a control IC suggests a sophisticated charging management system, capable of adapting to different input currents and protecting the battery from damage.

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