RK3308B Rockchip Quad-Core Cortex-A35 Smart Voice Processor with Integrated Audio Codec VAD Low-Power Wake-Up TQFP-128

RK3308B Product Overview

The RK3308B is a quad-core Arm Cortex-A35 processor designed by Rockchip specifically for smart voice applications, in a TQFP-128 package. The RK3308B integrates a high-performance audio codec (24-bit/192 kHz DAC, ADC), hardware Voice Activity Detection (VAD), 4 analog microphone inputs, 2 PDM digital microphone interfaces, and supports 8-channel I2S/TDM. The RK3308B provides rich peripherals including USB 2.0 OTG, 10/100M Ethernet MAC, SPI Flash/SDMMC boot, and UART/SPI/I2C interfaces. The built-in Hardware VAD of the RK3308B enables low-power standby wake-up. The RK3308B supports Linux/RTOS and is suitable for smart speakers, voice assistants, smart home panels, AI translators, voice recorders, and other battery-powered voice interaction devices.

RK3308B Core Features

CPU: The RK3308B is powered by a quad-core Arm Cortex-A35 at 1.3 GHz

Memory Interface: The RK3308B supports DDR3/DDR3L/LPDDR2, up to 512 MB

Storage Boot: The RK3308B boots from SPI Flash, eMMC (4.5/5.0), SD/SDIO

Audio: The RK3308B features 24-bit/192 kHz DAC, 24-bit ADC, 4× analog MIC, 2× PDM DMIC, 8-ch I2S/TDM, SPDIF output

Hardware VAD: The RK3308B implements ultra-low-power voice detection for standby wake-up

Display: The RK3308B supports SPI LCD

Ethernet: The RK3308B includes a 10/100M Ethernet MAC (external PHY required)

USB: The RK3308B provides USB 2.0 OTG (1 port)

Peripherals: The RK3308B integrates 6× UART, 4× I2C, 2× SPI, 8× PWM, 6× SAR-ADC

Security: The RK3308B offers secure boot, crypto engine (AES, SHA, RSA, TRNG)

Package: The RK3308B comes in a TQFP-128 (14×14 mm)

Temperature Range: The RK3308B operates from -20°C to 85°C

RK3308B Applications

Smart Speakers: The RK3308B enables full-array mic voice interaction and high-performance audio playback

Smart Home Panels: The RK3308B supports voice control and touchscreen interaction

AI Translators & Recorders: The RK3308B handles multi-mic capture and real-time voice processing

Voice IoT Devices: The RK3308B is ideal for smart alarms, storytelling machines, and in-vehicle voice assistants

Low-Power Battery Devices: The RK3308B enables long standby voice wake-up products relying on hardware VAD

RK3308B Key Advantages

High-Performance Quad-Core A35: The RK3308B delivers 1.3 GHz, meeting smart voice algorithm and Linux system requirements

Complete Audio Front-End: The RK3308B integrates DAC/ADC, 4× analog MIC, 8-ch I2S/TDM for direct microphone connection

Hardware-Level Low-Power Wake-Up: The RK3308B VAD enables microwatt-level voice standby

Flexible Storage & Boot: The RK3308B supports SPI Flash boot, reducing system cost and complexity

Lightweight Layout-Friendly: The RK3308B TQFP-128 package allows 4-layer PCB feasible, simplifying design vs. BGA

Rich Connectivity: The RK3308B offers Ethernet MAC, USB OTG, multiple UART/SPI/I2C for flexible expansion

Software Ecosystem: The RK3308B supports Linux Buildroot/Yocto and RTOS SDK, low development barrier

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FAQ

1. What is RK3308B?
RK3308B is a high-performance, low-power quad-core application processor from Rockchip, built on a 28nm advanced process. The RK3308B features a quad-core 64-bit ARM Cortex-A35 CPU and is designed for intelligent voice interaction, audio input/output processing, and other digital multimedia applications. The RK3308B removes GPU, video codec, and display modules while adding CODEC and audio-related modules, achieving exceptional cost-effectiveness.

2. What are the key specifications of RK3308B?
The RK3308B boasts a quad-core 64-bit ARM Cortex-A35 processor, up to 1.3GHz; supports ARM Neon SIMD engine acceleration; integrated VFPv4 hardware floating-point coprocessor. The RK3308B supports DDR2, DDR3/DDR3L, LPDDR2 memory, up to 512MB capacity. The RK3308B includes 256KB unified system L2 cache, 32KB L1 instruction cache and 32KB L1 data cache.

3. What package does RK3308B use?
TFBGA-355 package with 0.65mm ball pitch, the RK3308B chip size is 13mm × 13mm.

4. What applications is RK3308B suitable for?
The RK3308B is designed specifically for intelligent voice interaction devices, widely used in smart speakers, voice assistants, audio players, smart home (voice-controlled appliances), smart toys, in-vehicle systems, conference systems, IoT smart IoT, HMI, industrial control, and smart robotics.

5. What development tools support RK3308B?
Rockchip's Linux SDK (supporting Buildroot, etc.) is available for RK3308B. The RK3308B SDK supports multiple voice recognition solutions (e.g., DuerOS, Alexa) for various development needs. Development boards for RK3308B support flexible boot modes including NAND, SPI Flash/SPI NAND, eMMC, and SDMMC.

6. What is the operating temperature range of RK3308B?
The RK3308B has an operating temperature range of 0°C to 80°C.

7. What is the audio processing capability of RK3308B?
RK3308B integrates a high-performance Audio CODEC with 8-channel ADC and 2-channel DAC. The RK3308B directly supports up to 8-channel analog MIC array + echo reference. Rich audio interfaces on RK3308B include I2S, PCM, TDM, PDM, SPDIF, and HDMI ARC.

8. Does RK3308B support hardware voice wake-up (VAD)?
Yes. The RK3308B features a built-in hardware VAD (Voice Activity Detection) module supporting low-power voice wake-up. This feature on RK3308B continuously monitors human voice and responds promptly to voice requests, reducing system power consumption and extending battery life. Combined with the 8-channel microphone array, the RK3308B enables far-field pickup and fast wake-up response.

9. What is the difference between RK3308B and RK3308?
Both share the same core architecture. Key differences: RK3308B has pin adjustments compared to RK3308, adding some secondary multiplexing pins and one CAN interface. Additionally, RK3308B's pinctrl is largely the same as RK3308 but with additional iomux routes and 3bit iomux selection. The RK3308B is largely hardware pin-compatible with RK3308.

10. What peripheral interfaces does RK3308B support?
The RK3308B supports SDIO 3.0 (for external Wi-Fi/BT modules), 10/100Mbps RMII Ethernet controller, 1×USB 2.0 OTG and 1×USB 2.0 HOST. Display interface of RK3308B supports VOP (Video Output Processor) with RGB666/RGB565 hardware interface. The RK3308B also supports 3×SPI, 4×I2C, 5×UART (with pin sharing), ADC, and OTP memory.