Renesas DA14681-01U2DB-P

Overview

DA14681-01U2DB-P from Dialog Semiconductor is a Bluetooth 4.2-compliant, ultra-low-power SoC featuring an ARM Cortex-M0 processor (30 μA/MHz), integrated PMU with Li-ion battery charger and fuel gauge, hardware crypto engine (AES-256, SHA-512, ECC), and 128 kB Data SRAM - designed for compact rechargeable wearables such as fitness trackers and smartwatches.

For engineers reviewing the DA14681-01U2DB-P datasheet, DA14681-01U2DB-P pinout, DA14681-01U2DB-P application, or DA14681-01U2DB-P equivalent, key selection considerations include WL-CSP53 package footprint (3.4 × 3.0 mm), -93 dBm RX sensitivity, 0 dBm TX output, 3.4 mA TX current at 3 V, and native USB FS device interface support.

Technical Context

The DA14681-01U2DB-P implements a tightly coupled architecture where the ARM Cortex-M0 core operates at dynamically scalable frequencies (32 kHz–96 MHz), delivering up to 84 DMIPS while maintaining 30 μA/MHz active power efficiency. Its integrated PMU provides three regulated external supply rails, programmable USB charge detection, and high-accuracy fuel gauging for Li-ion/Li-polymer cells.

RF subsystem includes an integrated balun, 50 Ω single-wire antenna interface, and coexistence logic for multi-radio environments. The hardware crypto engine offloads SHA-512, AES-256, and ECC operations independently of the CPU, enabling end-to-end encrypted BLE connections without runtime overhead.

Key Specifications

Pinout & Package

DA14681-01U2DB-P is housed in a 53-ball Wafer-Level Chip-Scale Package (WL-CSP) with 0.4 mm ball pitch and 3.4 × 3.0 mm body size. This package supports fine-pitch routing and minimal PCB real estate usage for space-constrained wearables.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Bluetooth low energy SoC applications.

Compared with nRF52833 and CC2642R, the DA14681-01U2DB-P uniquely integrates USB FS, Li-ion charger, fuel gauge, and hardware crypto in a 3.4 × 3.0 mm WL-CSP - reducing BOM count by ≥4 discrete ICs in compact rechargeable wearables.

Availability

DA14681-01U2DB-P is available at Aetrix Electronics and suitable for fitness trackers, smartwatches, and rechargeable voice remotes requiring stable component supply, long-term lifecycle assurance, and validated WL-CSP assembly support.

Supply support for DA14681-01U2DB-P 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

Dialog Semiconductor plc is a UK-based fabless semiconductor company specializing in highly integrated power management, audio, and connectivity ICs for mobile, IoT, and automotive markets.

The SmartBond™ DA1468x product line was engineered specifically for ultra-low-power, space-constrained Bluetooth 4.2 applications - prioritizing battery longevity, minimal PCB area, and system-level integration in wearables and smart home endpoints.

FAQ

What is the package type and ball pitch of the DA14681-01U2DB-P?

The DA14681-01U2DB-P uses a 53-ball Wafer-Level Chip-Scale Package (WL-CSP) with 3.4 mm × 3.0 mm body dimensions and 0.4 mm ball pitch. This package is optimized for high-density wearable PCB layouts and supports standard reflow soldering processes without underfill requirements. The DA14681-01U2DB-P pinout is defined in Dialog's official DA14681 datasheet revision 1.3, section 5.1.

Does the DA14681-01U2DB-P support over-the-air (OTA) firmware updates?

Yes, the DA14681-01U2DB-P supports secure OTA firmware updates using its 64 kB OTP memory for bootloader storage and external Flash (via Quad-SPI) for application image storage. The hardware crypto engine enables authenticated and encrypted firmware images using AES-256 and SHA-512. DA14681-01U2DB-P implements Dialog's SmartSnippets™ SDK for streamlined OTA development and deployment.

Can the DA14681-01U2DB-P directly charge a Li-ion battery from USB?

Yes, the DA14681-01U2DB-P integrates a programmable USB-compatible battery charger supporting up to 5.0 V input with configurable charge curves, USB VBUS detection (VBUS_DET pin), and overvoltage/overcurrent protection. It natively manages constant-current/constant-voltage charging for single-cell Li-ion and Li-polymer batteries - eliminating the need for external charge ICs in DA14681-01U2DB-P designs.

What analog peripherals are included in the DA14681-01U2DB-P?

The DA14681-01U2DB-P includes an 8-channel 10-bit SAR ADC with hardware averaging and 11.5 ENOB, a temperature sensor, three white LED drivers, and a PDM interface with hardware sample rate conversion for two microphones or speakers. These peripherals are accessible through dedicated registers and supported in Dialog's SDK - no external signal conditioning is required for basic sensor or audio functions in DA14681-01U2DB-P implementations.

Is the DA14681-01U2DB-P pin-compatible with the DA14680 series?

No, the DA14681-01U2DB-P is not pin-compatible with DA14680 variants. While both share functional similarity, DA14681-01U2DB-P uses WL-CSP53 packaging (53 balls), whereas DA14680 uses AQFN60 (60-pin QFN). Pin assignments, power domains, and peripheral mappings differ between packages - board redesign is required when migrating from DA14680 to DA14681-01U2DB-P.