General description

The DA14681 is a flexible System-on-Chip combining

an application processor, memories, cryptography

engine, power management unit, digital and analog

peripherals and a Bluetooth Low Energy MAC engine

and radio transceiver.

The DA14681 is based on an ARM® Cortex®-M0 CPU

delivering up to 84 DMIPS and provides a flexible

memory architecture, enabling code execution from

embedded memory (RAM, ROM) or non-volatile memory (OTP or external Quad-SPI FLASH).

The advanced power management unit of the

DA14681 enables it to run from primary and secondary

batteries, as well as provide power to external devices.

The on-chip charger and state-of-charge fuel gauge

allow the DA14681 to natively charge rechargeable

batteries over USB.

An on-chip PLL enables on-the-fly tuning of the system

clock between 32 kHz and 96 MHz to meet high processing requirements. Several optimised sleep modes

are available to reduce power dissipation when there is

no activity.

Features

 Complies to Bluetooth v4.2, ETSI EN 300 328 and

EN 300 440 Class 2 (Europe), FCC CFR47 Part 15

(US) and ARIB STD-T66 (Japan)

 Flexible processing power

 0 Hz up to 96 MHz 32-bit ARM Cortex-M0 with

4-way associative cache

 Three optimised power modes (Extended sleep,

Deep sleep and Hibernation) reducing current to

1.4 uA

 Memories

 64 kB One-Time-Programmable (OTP) memory

 128 kB Data SRAM with retention capabilities

 16 kB Cache SRAM with retention capabilities

 128 kB ROM (including boot ROM and BLE stack)

 Power management

 Integrated Buck DC-DC converter (1.7 V - 4.75 V)

 Three power supply pins for external devices

 Supports Li-Polymer, Li-Ion, coin, NiMH and alkaline batteries

 Charger (up to 5.0 V) with programmable curves

 High accuracy state-of-charge fuel gauge

 Programmable threshold for brownout detection

 Digitally controlled oscillators and PLL

 16 MHz crystal oscillator

 16 MHz RC oscillator

 32 kHz crystal and RC oscillator

 11.7 kHz RCX oscillator

 Low power PLL up to 96 MHz

 Three general purpose timer/counters with PWM

 One 16-bit up/down timer/counter with PWM

available in extended/deep sleep mode

 Application cryptographic engine with ECC, AES256, SHA-1, SHA-256, SHA-512 and True Random

Number Generator

 Digital interfaces

 37 (AQFN) or 21 (WLCSP) general purpose I/Os

with programmable voltage levels

 Quad-SPI FLASH interface

 Two UARTs, one with hardware flow control

 Two SPI+™ interfaces

 Two I2C bus interfaces at 100 kHz, 400 kHz

 Three-axes capable Quadrature Decoder

 PDM + HW decimator (2 mics or 2 speakers)

 I2S/PCM master/slave interface up to 8 channels

 Keyboard scanner with debouncing

 Infrared (IR) interface (PWM)

 USB 1.1 Full Speed (FS) device interface

 Analog interfaces

 8-channel 10-bit ADC with averaging capability

 Three matched white LED drivers

 Temperature sensor

 Radio transceiver

 2.4 GHz CMOS transceiver with integrated balun

 50  matched single wire antenna interface

 0 dBm transmit output power

 -94 dBm receiver sensitivity (BLE)

 Supply current at VBAT1 (3 V):

TX: 3.4 mA

RX: 3.1 mA (with ideal DC-DC converter)

 Packages:

 AQFN with 60 pins, 6 mm x 6 mm

 WLCSP with 53 balls, 3.406 mm x 3.010 mm