RK3308B-S Rockchip Quad-Core Cortex-A35 Smart Voice Processor Security-Enhanced with Audio Codec VAD TQFP-128

RK3308B-S Product Overview

RK3308B-S is a security-enhanced quad-core Arm Cortex-A35 smart voice processor from Rockchip, packaged in TQFP-128. Building on RK3308B, the RK3308B-S strengthens secure boot, hardware crypto engine (AES/SHA/RSA/TRNG) and TrustZone technology to meet IoT security certification and data protection demands. The RK3308B-S integrates a 24-bit/192 kHz audio codec, hardware Voice Activity Detection (VAD), 4 analog MICs, 2 PDM DMICs, 8-channel I2S/TDM, USB 2.0 OTG, 10/100M Ethernet MAC, SPI Flash/SDMMC boot, and more. Supporting Linux/RTOS with microwatt-level VAD wake-up, the RK3308B-S targets security-sensitive applications such as smart speakers, voice panels, AI translators, recorders, and industrial voice terminals.

RK3308B-S Core Features

CPU: The RK3308B-S features a quad-core Arm Cortex-A35 at 1.3 GHz, with TrustZone security extension

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

Storage Boot: The RK3308B-S supports SPI Flash, eMMC 4.5/5.0, SD/SDIO, with secure boot supported

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

Hardware VAD: The RK3308B-S includes ultra-low-power voice activity detection for standby wake-up

Security: The RK3308B-S integrates secure boot, hardware crypto engine (AES, SHA, RSA, TRNG), ARM TrustZone

Ethernet: The RK3308B-S features a 10/100M Ethernet MAC (external PHY required)

USB: The RK3308B-S provides USB 2.0 OTG

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

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

Temperature Range: The RK3308B-S operates from -40°C to 85°C

RK3308B-S Applications

Secure Smart Speakers: The RK3308B-S enables full-array mic interaction with secure boot and data protection

Smart Home Panels: The RK3308B-S supports voice and touchscreen terminals with security authentication

AI Translators & Recorders: The RK3308B-S handles multi-mic capture with firmware and data security

Industrial Voice Terminals: The RK3308B-S operates in -40–85°C wide-temp for voice control and alarms

Battery-Powered Voice Devices: The RK3308B-S enables long standby via hardware VAD, with security and low power

RK3308B-S Key Advantages

Enhanced Security: The RK3308B-S delivers secure boot + hardware crypto + TrustZone enabling trusted execution for voice IoT

Quad-Core A35 Performance: The RK3308B-S provides 1.3 GHz for Linux and complex voice algorithms

Complete Audio Front-End: The RK3308B-S integrates a 24-bit codec, multiple mic inputs, and rich I2S connectivity

Hardware-Level Low Power: The RK3308B-S VAD keeps voice standby at microwatt levels

Industrial Temperature: The RK3308B-S operates from -40°C to 85°C for harsh environments

Layout-Friendly: The RK3308B-S TQFP-128 reduces PCB complexity and cost vs. BGA

Rich Ecosystem: The RK3308B-S official Linux/RTOS SDK enables fast development

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FAQ

1. What is RK3308B-S?
RK3308B-S is a high-performance, low-power quad-core application processor from Rockchip, built on a 28nm process. The RK3308B-S 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-S is an enhanced model in the RK3308 series targeting smart voice and AIoT applications.

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

3. What package does RK3308B-S use?
The RK3308B-S uses a TFBGA-355 package, measuring 13mm × 13mm.

4. What applications is RK3308B-S suitable for?
The RK3308B-S is widely used in smart speakers, smart home (voice-controlled appliances), smart toys (voice interaction, story playback), and smart automotive (voice navigation, music playback). The RK3308B-S is also suitable for conference systems, IoT gateways, and industrial control.

5. What development tools support RK3308B-S?
Rockchip's Linux SDK (supporting Buildroot/Debian, etc.). The RK3308B-S SDK supports multiple voice recognition solutions (e.g., DuerOS, Alexa) for various development needs.

6. What is the operating temperature range of RK3308B-S?
The RK3308B-S operates from 0°C to 80°C.

7. Does RK3308B-S support security-enhanced features?
Yes. The RK3308B-S supports ARM TrustZone technology, providing hardware-level secure isolation. The RK3308B-S also supports ARMv8 Cryptography Extensions, providing hardware-accelerated support for data encryption and authentication.

8. What is the audio processing capability of RK3308B-S?
The RK3308B-S integrates a high-performance Audio CODEC, directly supporting up to 8-channel analog MIC array + echo reference. The RK3308B-S features a built-in hardware VAD (Voice Activity Detection) module for low-power voice wake-up. The RK3308B-S supports rich audio interfaces including I2S, PCM, TDM, PDM, SPDIF, HDMI ARC.

9. What is the difference between RK3308B-S and RK3308H?
Both are from the RK3308 series. Key difference: RK3308H is the embedded 64MB DDR2 memory version, ideal for higher BOM integration; RK3308B-S uses external memory, allowing flexible memory configuration (up to 512MB), offering greater flexibility in memory capacity and cost control. Both the RK3308B-S and RK3308H use the same TFBGA-355 package.

10. What peripheral interfaces does RK3308B-S support?
The RK3308B-S 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. The RK3308B-S provides storage boot options including eMMC 5.1, NAND Flash, SPI Nor/Nand Flash, and SD card. The RK3308B-S also supports I2C, UART, SPI, PWM, and other rich interfaces.