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Analog Devices Inc./Maxim Integrated DS2488X+U
- Part No.:
- DS2488X+U
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Controllers
- Package:
- 8-XFBGA, WLBGA
- Datasheet:
-
DS2488X+U.pdf
- Description:
- 1-WIRE DUAL-PORT LINK
- Quantity:
- Payment:
- Shipping:
Inventory:2,527
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Product details
Overview
The DS2488X+U from Analog Devices is a dual-port 1-Wire bridge IC enabling bidirectional communication, battery charging power delivery, and small-message exchange between two microcontroller subsystems-e.g., Bluetooth audio SoC in TWS earbuds and case MCU-via single-contact 1-Wire interfaces IOA and IOB, supporting 512kbps pass-through mode, 64-bit factory ROM ID, and three open-drain GPIO pins.
For engineers reviewing the DS2488X+U datasheet, DS2488X+U pinout, DS2488X+U application, or DS2488X+U equivalent, key selection considerations include its 1.71V–3.63V operating range, 5V-tolerant IOA for charger enable detection (4V–5V threshold), 8-ball WLP package (1.6mm × 0.9mm), ±8kV HBM ESD on IOA, and token-based arbitration between IOA/IOB for reliable TWS earbud–case coordination.
Technical Context
The DS2488X+U implements a dual 1-Wire interface with token arbitration: TOKEN pin indicates active side (low = IOA, high = IOB), and internal state machine governs transitions between charging detection, quiet mode, and pass-through mode. It uses a 30kHz oscillator with 10kHz timer division to monitor falling edges and maintain pass-through state.
Power architecture is asymmetric: IOA operates parasitically (1.71V–3.63V) or with strong pullup; IOB, PIOA, PIOB, TOKEN, and CD/PIOC require VL supply (1.71V–3.63V). The integrated voltage comparator (VCMP = 4.0V typ) triggers CD/PIOC output to control external transistor when IOA reaches 4V–5V, enabling power delivery to IOB-side battery charger.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Data Rate | 512kbps in bidirectional pass-through mode for UART-to-UART file transfer between subsystems |
| Operating Voltage | 1.71V–3.63V on VL and IOA; IOA tolerant to 4V–5V for charger detection |
| ROM ID | Factory-programmed 64-bit unique identifier for multi-drop earbud identification in charging case |
| GPIO Pins | Three open-drain pins (PIOA, PIOB, CD/PIOC) configurable for status reporting or charger control |
| Package | 8-ball WLP (1.6mm × 0.9mm × 0.33mm, 0.4mm pitch) optimized for space-constrained earbuds |
| ESD Rating | ±8kV HBM on IOA pin-critical for handling electrostatic discharge during earbud insertion/removal |
| Temperature Range | –40°C to +85°C-validated for consumer wearable thermal environments |
Pinout & Package
DS2488X+U uses an 8-ball Wafer-Level Package (WLP) with Z80D1+1 outline, designed for ultra-compact placement in true wireless stereo earbuds and charging cases.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1: PIOA | General-purpose I/O A | Open-drain output/input referenced to VL; used for earbud status signaling or interrupt generation |
| A2: PIOB | General-purpose I/O B | Open-drain output/input referenced to VL; supports case-side feature control or in-box detection |
| A3: VL | Low-voltage supply input | Mandatory 1.71V–3.63V rail powering IOB, PIOA, PIOB, TOKEN, and internal logic-not required for basic IOA-only operation |
| A4: IOA | 1-Wire I/O A | Parasitically powered 1-Wire port; detects 4V–5V for charger enable; controls token arbitration and buffer access |
| B1: TOKEN | Token indicator output | Open-drain output indicating active side (low = IOA, high = IOB); outputs 30kHz clock in pass-through mode |
| B2: CD/PIOC | Charger Disable / GPIO C | Configurable output: actively pulls low to enable external charger transistor when IOA ≥ 4V; floats otherwise |
| B3: IOB | 1-Wire I/O B | 1-Wire port requiring VL supply; used by case MCU for ROM ID read, buffer exchange, and status polling |
| B4: GND | Ground reference | Common return path for VL, IOA parasitic supply, and all I/O circuits |
Key Features
| Feature | Design Value |
|---|---|
| Dual 1-Wire arbitration | Token-based side selection (IOA vs. IOB) prevents bus contention in multi-device earbud–case systems |
| 512kbps pass-through mode | Enables high-speed UART bridging without MCU firmware overhead-ideal for firmware updates or sensor data sync |
| Integrated 4V–5V comparator | Automatically enables CD/PIOC output to activate external charging FET when earbud inserted into powered case |
| 64-bit factory ROM ID | Provides unambiguous left/right earbud identification in shared 1-Wire bus-eliminates need for separate address lines |
| 8-byte message buffer | Supports small command/status exchange (e.g., battery level, lid detect, in-ear status) without full UART stack implementation |
Applications
| True Wireless Stereo Earbuds | Charging Case Control |
|---|---|
Use Scenario: Right and left earbuds communicate battery status, in-ear detection, and firmware version to the charging case MCU via shared 1-Wire bus. IC Role / Device Role / Timing Role: DS2488X+U acts as a dual-port bridge-IOA connects to earbud SoC, IOB to case MCU-with token arbitration ensuring deterministic access. Use Value: Eliminates dedicated UART or I²C lines, reducing PCB layer count and interconnect complexity while preserving earbud form factor. | Use Scenario: Charging case detects earbud insertion, verifies battery health, and initiates charging sequence upon valid ROM ID match. IC Role / Device Role / Timing Role: DS2488X+U provides ROM ID read capability on IOB and 4V–5V detection on IOA to trigger CD/PIOC-controlled charging FET. Use Value: Enables zero-configuration "plug-and-charge" behavior with automatic earbud identification and safe power delivery sequencing. |
| Wearable Health Monitoring | Electronic Lock Systems |
Use Scenario: Smart earbuds with heart rate and temperature sensors transmit biometric data to companion case or phone via DS2488X+U pass-through mode. IC Role / Device Role / Timing Role: DS2488X+U serves as a UART-to-1-Wire translator-SoC sends UART frames to IOA, DS2488X+U forwards them at 512kbps to IOB-connected host. Use Value: Achieves >5× speed increase over standard 1-Wire (15.4kbps), enabling real-time streaming of compressed sensor payloads. | Use Scenario: Secure lock module verifies authorized credential (e.g., NFC tag) and communicates access grant/deny status to door controller via DS2488X+U. IC Role / Device Role / Timing Role: DS2488X+U bridges credential reader (IOA) and lock actuator MCU (IOB), using PIOA/PIOB for tamper detection and status LED control. Use Value: Provides galvanic isolation via 1-Wire, preventing ground-loop interference and simplifying EMI filtering in safety-critical access systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port bridge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS2482-100 | Single 1-Wire master with I²C interface; no IOB port, no pass-through mode, no 5V-tolerant IOA | Limited to host-to-peripheral 1-Wire control-not suitable for bidirectional earbud-case messaging or power delivery | Select only if system requires I²C-to-1-Wire translation without peer-to-peer bridging |
| MAX14689 | USB-C port manager with integrated 1-Wire bridge; larger QFN-24 package; requires USB PD controller integration | Targets USB-C accessories-not optimized for ultra-low-power, space-constrained wearables | Consider only for USB-C-enabled charging cases needing simultaneous power negotiation and 1-Wire bridging |
Compared with DS2482-100 and MAX14689, the DS2488X+U uniquely combines dual 1-Wire arbitration, 512kbps pass-through, 4V–5V charger detection, and 0.33mm-profile WLP-making it the only solution purpose-built for TWS earbud–case interoperability with minimal footprint and zero additional protocol stacks.
Availability
DS2488X+U is available at Aetrix Electronics and suitable for true wireless stereo earbuds, wearable health monitors, and electronic lock systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for DS2488X+U includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and consumer markets.
The DS2488X+U belongs to Analog Devices' 1-Wire interface product line, engineered specifically for ultra-low-power, space-constrained wireless accessories requiring robust, low-pin-count bridging between isolated subsystems.
FAQ
What is the primary function of the DS2488X+U in a true wireless stereo system?
The DS2488X+U serves as a dual-port 1-Wire bridge between the earbud's Bluetooth SoC (connected to IOA) and the charging case's MCU (connected to IOB). It enables ROM ID–based earbud identification, small-message exchange (e.g., battery level), and 512kbps pass-through mode for firmware updates-replacing dedicated UART or I²C interconnects while maintaining ultra-small size.
Does the DS2488X+U require an external power supply, and if so, which pins depend on it?
Yes-the DS2488X+U requires VL (1.71V–3.63V) to power IOB, PIOA, PIOB, TOKEN, and internal logic. IOA can operate parasitically from its 1-Wire bus, but VL is mandatory for IOB communication and all pass-through mode operation. The CD/PIOC pin is powered solely by IOA's parasitic supply, enabling charger control even when VL is absent.
How does the DS2488X+U detect when an earbud is inserted into a powered charging case?
The DS2488X+U uses its internal voltage comparator to monitor IOA: when IOA rises to 4.0V (typ, 3.7V–4.3V range), the device asserts CD/PIOC low to enable an external transistor that delivers charging current to the earbud battery. Simultaneously, the TOKEN pin goes high, granting IOB access so the case MCU can read the earbud's 64-bit ROM ID and confirm presence.
Can the DS2488X+U operate in environments with high electrostatic discharge risk, such as consumer earbud handling?
Yes-the DS2488X+U features ±8kV HBM ESD protection on the IOA pin, validated per JEDEC JS-001. This rating directly addresses discharge events during earbud insertion/removal from metal or plastic charging cases, ensuring robust operation without external TVS diodes in most consumer implementations.
What is the role of the TOKEN pin on the DS2488X+U, and how does it affect communication timing?
The TOKEN pin signals which side (IOA or IOB) holds communication authority: low = IOA active, high = IOB active. During pass-through mode, it outputs a 30kHz clock. This arbitration prevents bus collisions in multi-drop configurations and ensures deterministic latency-e.g., case MCU reads ROM ID only when TOKEN is high, eliminating polling delays and guaranteeing response within one 1-Wire time slot (≤11μs).
DS2488X+U Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-XFBGA, WLBGA
- Programmable:
- Not Verified
- Protocol:
- 1-Wire®
- Function:
- Controller
- Interface:
- 1-Wire®
- Standards:
- -
- Voltage - Supply:
- 1.71V ~ 3.63V
- Current - Supply:
- 60µA
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-WLP (1.6x0.9)
- Grade:
- -
- Qualification:
- -
DS2488X+U FAQ
1.How can I place an order for DS2488X+U through Aetrix?
Please submit a Request for Quotation (RFQ) for DS2488X+U on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for DS2488X+U reliable?
The price and inventory of DS2488X+U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS2488X+U is usually 5 days.
3.What payment methods are accepted for DS2488X+U?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS2488X+U transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS2488X+U?
DS2488X+U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS2488X+U order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for DS2488X+U?
For technical support, including DS2488X+U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS2488X+U requirements.
6.How does Aetrix verify that DS2488X+U is sourced from the original manufacturer or authorized distributors?
All DS2488X+U products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that DS2488X+U meets industry standards.
7.What is the process for return or replacement of DS2488X+U?
All DS2488X+U units undergo pre-shipment inspection (PSI). If there is an issue with DS2488X+U, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The DS2488X+U part is unused and in its original packaging.
Return procedure for DS2488X+U:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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