Standby current of VBAT: 3μA shipmode current: 1μA VIN withstand voltage: 16V VIN OVP = 6.0V/6.8V Constant current charging current register adjustable, adjustable range 2mA~500mA Floating charge voltage 4.00V~4.10V adjustable, step = 25mV Floating charge voltage 4.10V~4.50V adjustable, step = 12.5mV, accuracy ±0.5% Supports battery internal resistance compensation BATS Trickle current ITC and cutoff current ITERM register adjustable, adjustable range 1mA~40mA When VIN=5V, automatic recharging, recharging voltage adjustable When VIN<VINUV, active recharging request, recharging voltage adjustable Watchdog function, 40s/80s/160s configurable Trickle charging stage and fast charging stage charging timeout configurable Supports linear direct charging, direct charging voltage from 3.0V, charging efficiency up to 97% or more; supports DCDC charging, charging efficiency 93% or more Integrated bidirectional communication, communication direction automatic switching/manual switching configurable, rate up to 3Mbps Integrated power line bidirectional communication mode: (1) Supports bidirectional voltage mode communication; (2) Supports voltage mode reception/current mode transmission communication mode Integrated private protocol, supports charging cradle to control SY5502 through VIN terminal Integrated in-cradle/out-of-cradle status automatic detection function Supports I2C, rate up to 400kbps, can continuously read/write Integrated 12bit SAR-ADC, can read VIN, VBAT, NTC voltage, ICC current, IVIN current Integrated battery gauge, accuracy up to 5%

The SY5502 is a chip specifically designed for TWS earphones, providing a perfect solution for charging and isolated communication. The chip integrates NVDC architecture, DCDC charging management/linear charging, discharge overcurrent/short circuit protection, (case and earphone) single-wire bidirectional data communication, battery gauge, 12-bit SAR-ADC, and an I2C communication interface, facilitating earphone charge/discharge management and data communication for users.
The SY5502 charging current can be adjusted via a register, with an adjustable range of 2mA~500mA. The chip integrates an NTC detection function for safer battery charging and discharging. The SY5502 features battery discharge protection and a shipmode function to meet the low-power requirements of the earphone system.
The SY5502 integrates a proprietary protocol. The earphone charging case can control the SY5502 by sending proprietary instructions to VIN, enabling power on/off and reset operations of the earphone main control.
The SY5502 also supports intelligent identification of in-case/out-of-case status and actively notifies the earphone main control.
The SY5502 boasts rich functionality and low power consumption, significantly shortening the development cycle of Bluetooth earphones. Its compact CSP-2.0mmx2.0mm package saves considerable space for Bluetooth earphone solutions.