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DS2488
1-Wire Dual-Port Link
General Description
Benefits and Features
The DS2488 is a simple bridge device that with a single
dedicated contact on each side of the bridge enables up
to 512kbps pass-through communication, power delivery
for battery charging, small message exchange, and state
reporting between two microcontroller-based subsystems.
An example application is true wireless stereo (TWS) ear-
● Two-Contact Solution Enables Advance TWS
Features
• Small Message Exchange between a Case and
Earbuds
• High-Speed 512kbps Pass-Through Mode to
Transfer Files
• Earbud Battery Charger Power Delivery
• Three GPIO Pins for Optional Feature Control or
State Detection
®
buds containing a Bluetooth Audio SoC and the micro-
controller operated case that holds and charges the ear-
buds. In this scenario, the DS2488 would reside in ear-
buds alongside the SoC, and the charge case microcon-
troller would communicate with the DS2488 from a sin-
gle dedicated pin. All of this is enabled with the flexibili-
● Full Range of Capabilities for Earbud and Charging
Case Detection
• Earbud 64-Bit Identification Number (ROM ID)
Readable upon Insertion
®
ty of the 1-Wire interface, which is used to operate each
of the two independent I/O ports, IOA and IOB. To en-
able device operation between two connected controllers,
each of these two DS2488 1-Wire interfaces has access
to a 64-bit factory-programmed ROM ID, an 8-byte buffer
to transmit small messages, and registers for device con-
figuration, status, and control of three open-drain GPIO
pins. Through a configuration setting a bidirectional, high-
speed 512kbps pass-through mode is enabled, which en-
ables large data transfers between the two connected mi-
crocontrollers.
• Operating Power Parasitically Derived from the
1-Wire IOA Line
• Detect when in or out of a Charging Case
• Detect a Dead Charging Case Battery
● Minimalist Dual 1-Wire Interface Reduces Cost and
Complexity
• Single Dedicated Contact for Communication and
Power
• Arbitrated Communication between Two Host
Controllers at 90kbps
For communication between IOA and IOB, the DS2488
has a maximum operating voltage of 3.63V. But to support
a special mode of power delivery from the subsystem con-
nected to the IOA side to the subsystem connected to the
IOB side, the device is 5V tolerant and goes into the pow-
er delivery state when 4V to 5V (nom) is applied to IOA. In
this mode, an additional DS2488 output pin is used to con-
trol an external transistor for power delivery to IOB-side
electronics, such as a battery charger.
• Reads and Writes over a Wide, 1.71V to 3.63V
Voltage Range
● Ideal for Battery Power Consumer Applications
• Small, 1.6mm x 0.9mm x 0.33mm WLP with 0.4mm
Ball Pitch
• 1.71V to 3.63V Operating Voltage Range
• High ESD Immunity of IOA Pin: ±8kV HBM (typ)
• -40°C to +85°C Operation
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 3; 9/22
Ordering Information appears at end of data sheet.
© 2022 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners.
One Analog Way, Wilmington, MA 01887 U.S.A. | Tel: 781.329.4700 | © 2022 Analog Devices, Inc. All rights reserved.
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