TWS earphone charging box

The TWS headset charging bin solution developed based on ML51 mainly has two major functions: data communication with the headset and charge and discharge management. Data communication is carried out with the headset through the pogo pin to realize pop-up windows and other functions that require data communication; the battery charging management unit has built-in lithium battery overcharge, over-discharge, short circuit, over-current and other protection functions, making the system stable and reliable.

Features of the solution
- One-line communication with Bluetooth headset through 2 pogo pins
- Opening and closing detection of the box through Hall sensor
- High-precision battery voltage and current detection
- Charge and discharge management
- 3 LED lights can achieve a variety of display effects Support Micro USB/Type-C/Lightning three power input interfaces
- system standby current less than 4 μA

MCU features
ML51 (low power consumption and high performance 1T-8051)
- supports up to 24 MHz main frequency
- wide voltage operating range: 1.8V ~ 5.5 V
- Built-in 12-bit ADC, built-in fifth-order reference voltage
- Strong sink current driving capability
- Built-in PDMA
- Low power operation: <15 μA, sleep mode: <1 μA