RK3308H Rockchip Quad-Core Cortex-A35 Smart Voice Processor with Integrated DRAM Audio Codec VAD TQFP-128

RK3308H Product Overview

RK3308H is a highly integrated quad-core Arm Cortex-A35 smart voice processor from Rockchip, housed in a TQFP-128 package. By integrating DRAM on-chip, it further reduces external component count, PCB area, and BOM cost. The RK3308H incorporates 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 RK3308H targets space- and cost-sensitive products such as smart speakers, smart home voice panels, voice recorders, storytelling machines, and in-vehicle voice assistants.

RK3308H Core Features

CPU: Quad-core Arm Cortex-A35 at 1.3 GHz

Integrated DRAM: RK3308H LPDDR2/DDR3L DRAM simplifies system design

Storage Boot: SPI Flash, eMMC 4.5/5.0, SD/SDIO

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

Hardware VAD: Ultra-low-power voice activity detection for standby wake-up

Ethernet: 10/100M Ethernet MAC (external PHY required)

USB: USB 2.0 OTG

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

Package: TQFP-128 (14×14 mm)

Temperature Range: -40°C to 85°C

RK3308H Applications

Smart Speakers: Full-array mic voice interaction with built-in DRAM saving PCB space

Smart Home Panels: Compact voice-control and display terminals

Voice Recorders & Translators: Multi-mic recording and real-time speech recognition

In-Vehicle Voice Assistants: Reliable wide-temperature voice interaction modules

IoT Voice Devices: Battery-powered products where board area and cost are critical

RK3308H Key Advantages

Integrated DRAM: RK3308H memory eliminates external DDR, greatly simplifying layout and BOM

Quad-Core A35 Performance: 1.3 GHz for Linux and voice algorithms

Complete Audio Front-End: Built-in 24-bit codec and multiple mic inputs for a one-stop audio solution

Microwatt Standby: Hardware VAD monitors voice commands at ultra-low power

Industrial Temperature: -40°C to 85°C for harsh environments

Easy Layout: TQFP-128 enables production with only 2–4 layer PCBs

Mature Ecosystem: Official Rockchip Linux/RTOS SDK and documentation support

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FAQ

1. What is RK3308H?
RK3308H is a high-performance quad-core application processor from Rockchip, built on a 40nm process. It 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. RK3308H is the embedded-memory version of RK3308B.

2. What are the key specifications of RK3308H?
Quad-core 64-bit ARM Cortex-A35 processor, up to 1.3GHz; supports ARM Neon SIMD engine acceleration with integrated VFPv4 hardware floating-point coprocessor; 256KB unified system L2 cache, 32KB L1 instruction cache, and 32KB L1 data cache; integrated 64MB DDR2 memory; supports up to 512MB external DDR2/DDR3/DDR3L/LPDDR2 memory; supports boot from NAND, SPI Flash, eMMC 5.1, and SD card.

3. What package does RK3308H use?
TFBGA-355 package (0.65mm ball pitch), with chip dimensions of 13mm × 13mm × 1.2mm.

4. What applications is RK3308H suitable for?
Designed specifically for intelligent voice interaction devices, including smart speakers, voice assistants, audio players, conference systems, in-vehicle entertainment, and smart home appliances.

5. What development tools support RK3308H?
Rockchip's Linux SDK (supporting Buildroot, Linux kernel 4.4). The SDK supports multiple intelligent voice recognition solutions (e.g., DuerOS, Alexa) to meet various development requirements.

6. What is the operating temperature range of RK3308H?
RK3308H has an operating temperature range of 0°C to 85°C. Some module solutions support -10°C to 75°C.

7. What is the audio processing capability of RK3308H?
RK3308H integrates a high-performance Audio CODEC supporting direct audio output and analog MIC input. Rich audio interfaces: supports 8CH I2S × 2 and 2CH I2S × 1, 8CH PDM × 1, 8CH TDM × 2, and SPDIF. Features a built-in hardware VAD (Voice Activity Detection) module for low-power voice wake-up.

8. What is the display output capability of RK3308H?
RK3308H features a built-in VOP (Video Output Processor) supporting RGB666/RGB565 hardware interfaces, with maximum output resolution of 1280×720 (720P).

9. What is the difference between RK3308H and RK3308H3?
Both are embedded-memory versions of the RK3308 series. Key difference: RK3308H integrates 64MB DDR2 memory; RK3308H3 integrates 256MB DDR3L memory. Additionally, RK3308H3 has a slightly larger chip size of 16mm × 16mm compared to RK3308H's 13mm × 13mm.

10. What peripheral interfaces does RK3308H support?
RK3308H 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. Also supports 3×SPI, 4×I2C, 5×UART (with pin sharing), 4×PWM, ADC, and OTP memory.