Click here to ask about the production status of specific part numbers. DS2488 1-Wire Dual-Port Link General Description Benefits and Features The DS2488 is a simple bridge device that with a single Two-Contact Solution Enables Advance TWS dedicated contact on each side of the bridge enables up Features to 512kbps pass-through communication, power delivery Small Message Exchange between a Case and for battery charging, small message exchange, and state Earbuds reporting between two microcontroller-based subsystems. High-Speed 512kbps Pass-Through Mode to An example application is true wireless stereo (TWS) ear- Transfer Files buds containing a Bluetooth Audio SoC and the micro- Earbud Battery Charger Power Delivery controller operated case that holds and charges the ear- Three GPIO Pins for Optional Feature Control or buds. In this scenario, the DS2488 would reside in ear- State Detection buds alongside the SoC, and the charge case microcon- Full Range of Capabilities for Earbud and Charging troller would communicate with the DS2488 from a sin- Case Detection gle dedicated pin (see the Typical Application Circuit). All Earbud 64-Bit Identification Number (ROM ID) of this is enabled with the flexibility of Maxims 1-Wire in- Readable upon Insertion terface, which is used to operate each of the two inde- Operating Power Parasitically Derived from the pendent I/O ports, IOA and IOB. To enable device opera- 1-Wire IOA Line tion between two connected controllers, each of these two Detect when in or out of a Charging Case DS2488 1-Wire interfaces has access to a 64-bit factory- Detect a Dead Charging Case Battery programmed ROM ID, an 8-byte buffer to transmit small Minimalist Dual 1-Wire Interface Reduces Cost and messages, and registers for device configuration, status, Complexity and control of three open-drain GPIO pins. Through a Single Dedicated Contact for Communication and configuration setting a bidirectional, high-speed 512kbps Power pass-through mode is enabled, which enables large data Arbitrated Communication between Two Host transfers between the two connected microcontrollers. Controllers at 90kbps For communication between IOA and IOB, the DS2488 Reads and Writes over a Wide, 1.71V to 3.63V has a maximum operating voltage of 3.63V. But to support Voltage Range a special mode of power delivery from the subsystem con- Ideal for Battery Power Consumer Applications nected to the IOA side to the subsystem connected to the Small, 1.6mm x 0.9mm x 0.33mm WLP with 0.4mm IOB side, the device is 5V tolerant and goes into the pow- Ball Pitch er delivery state when 4V to 5V (nom) is applied to IOA. In 1.71V to 3.63V Operating Voltage Range this mode, an additional DS2488 output pin is used to con- High ESD Immunity of IOA Pin: 8kV HBM (typ) trol an external transistor for power delivery to IOB-side -40C to +85C Operation electronics, such as a battery charger. Ordering Information appears at end of data sheet. Applications True Wireless Stereo Earbuds and Charger Box Communication and Control Bridging Wearable Devices Electronic Locks 1-Wire is a registered trademark of Maxim Integrated Products, Inc. Bluetooth is a registered trademark of Bluetooth SIG, Inc. 19-100871 Rev 1 9/20DS2488 1-Wire Dual-Port Link Simplified Application Block Diagram 1F CD/PIOC 5V BATTERY PIOA/B CHARGER 3.3V TOKEN HOST A GPIO/INT 1.8V DS2488DS2488 HOST B V L TX IOA RX UART GND UART RX IOB TX www.maximintegrated.com Maxim Integrated 2