Realtek RTL8735B
SoCs
Ameba IoT wireless solutions, featuring high integration, stable performance, low power consumption, and enhanced security
Highlights
Realtek RTL8735B series is a new generation of highly integrated Wi-Fi/Bluetooth/Image ISP eight-in-one single-chip solution, featuring a 10mm x 10mm QFN package. Its low power consumption design significantly extends the system's battery life. The single chip also provides rich I/O interfaces and has successfully assisted customers in designing compact IoT doorbells, portable AI cameras, home appliances with AIoT camera video requirements, applications for edge AI audio-visual recognition, and IoT devices that can be powered by batteries.
Integrates an NPU engine with up to 0.4TOPS computing power, and also integrates an Armv8-M processor, up to 500MHz.
Supports 2K/FHD high-definition video, 1080p@30fps + 720p@30fps, 2K@24fps, and supports millisecond-level fast boot-up to ensure no footage is missed.
Integrates various security features including Arm TrustZone®, secure boot, symmetric encryption, asymmetric encryption, TRNG, HUK, OTP storage, Flash XIP decryption, etc., to safeguard the security of customer products
Supporting 5GHz band to effectively avoid common interference sources (Bluetooth, Zigbee, and microwave devices etc.) through spectrum isolation, leveraging abundant non-overlapping channel resources to significantly reduce co-channel interference risks, delivering high-speed, low-interference stable transmission performance
Built-in audio codec supports audio input and output, reducing dependency on external components and adaptation costs, facilitating voice interaction and audio playback.
Integrates H.264/H.265 video encoding, and supports AI model conversion: yolov3/4/7-tiny and CNN Gray/RGB
System Architecture
- Armv8M architecture
- Up to 500MHz
- 32KB I-Cache
- 32KB D-Cache
- 0.4TOPS@INT8/INT16 (NPU) computing power
- Embedded 64MB/128MB/256MB DDR2/DDR3 memory: 533MHz
- Internal 768KB ROM: 250MHz
- Internal 512KB SRAM: 250MHz
- Supports SPI NOR Flash or NAND Flash
Part Number
| Part number | RTL8735BDM-VA4-CG | RTL8735BM-VA4-CG | RTL8735BDM-VA9-CG |
|---|---|---|---|
| Real-M500 | 500MHz | 500MHz | 500MHz |
| NPU | 0.4TOPS@INT8/INT16 | 0.4TOPS@INT8/INT16 | 0.4TOPS@INT8/INT16 |
| ISP/Video Processor | Up to 2K/FHD | Up to 2K/FHD | Up to 2K/FHD |
| On-chip SRAM | 512KB | 512KB | 512KB |
| Arm TrustZone | |||
| DDR | 128MB (DDR2) | 128MB (DDR2) | 256MB (DDR3) |
| Wi-Fi | Wi-Fi 4 (Dual Band) | Wi-Fi 4 (2.4GHz) | Wi-Fi 4 (Dual Band) |
| Bluetooth | LE | LE | LE |
| Operating voltage | 3.135V ~ 3.465V | 3.135V ~ 3.465V | 3.135V ~ 3.465V |
| Operating temperature | -20°C ~ 85°C | -20°C ~ 85°C | -20°C ~ 85°C |
| Package (mm) | QFN128 (10 x 10) | QFN128 (10 x 10) | QFN128 (10 x 10) |
Video/ISP Features
- Multi-stream real-time H.265/H.264/JPEG encoding
- Supports 5-megapixel (2592x1944) sensor
- 1080p@45fps; 2K@24fps
- Supports 12bit Bayer pattern input and 8bit YUY2 input from CMOS sensor
- Supports MIPI CSI-2 four data lane
- CBR/VBR/CVBR/FIXQP/AVBR rate control, ROI/GDR, rotation/cropping
- Supports Auto Banding, Auto Exposure, Auto White Balance
- Advanced temporal and spatial noise reduction(3DNR)
- Lens shading compensation/ Black level compensation and dead pixel cancellation/ horizontal lens distortion correction/ High dynamic range fusion and tone mapping for HDR sensor input
- Programmable gamma table
- Digital WDR
- Image enhancement(brightness, contrast, saturation, hue and sharpness)
- ISP tool for easy image quality tuning
Peripheral Interfaces
| Function | Quantity |
|---|---|
| GPIO | 59 |
| SPI | 2 |
| UART | 4 |
| I2C | 2 |
| PWM | 12 |
| ADC | 8 |
| GDMA | 12 |
| USB 2.0 | 1 |
| SD Host Controller | 1 |
| Audio DAC | 1 |
| Audio ADC | 1 |
| Digital Microphone | 2 |
Security Features
We consistently prioritize security as the core of our products, offering our customers a rich array of security features through hardware design and providing exceptional hardware-based attack resistance, helping to create IoT products with ultimate security.
| Features | Filter | RTL8721Dx | RTL8720E | RTL8710E | RTL8726E | RTL8713E | RTL8730E | RTL8721F | RTL872xD | RTL8735B |
|---|---|---|---|---|---|---|---|---|---|---|
| AES Hardware Engine | ||||||||||
| SHA Hardware Engine | ||||||||||
| ECDSA/ECDH Hardware Engine | ||||||||||
| EDDSA Hardware Engine | ||||||||||
| RSA Hardware Engine | ||||||||||
| Secure Boot | ||||||||||
| Flash OTF Decryption | ||||||||||
| Arm TrustZone | ||||||||||
| OTP Secure Storage | ||||||||||
| True Random Number Generator | ||||||||||
| HUK Derivation Mechanism | ||||||||||
| Authenticated Debug Access |
In addition to the essential symmetric encryption engines like AES for IoT, we also provide computationally more intensive asymmetric encryption algorithms such as ECDSA, EdDSA, and RSA. This greatly alleviates the computational burden on the CPU and improves encryption and decryption speeds
Based on asymmetric encryption and digital signature mechanisms, it verifies public key hashes and firmware signatures. This process can prevent tampering and rollback attacks, ensuring that the device only runs trusted firmware
Supports both embedded and external Flash, with independent key encryption for multiple firmware. When the CPU executes encrypted firmware, it is decrypted in real-time by hardware, with nearly imperceptible performance impact. Supports unique encryption for each device, preventing injection and cloning attacks
Based on the Arm TrustZone® architecture, coupled with a dedicated hardware access control unit, it achieves strong isolation protection for secure memory areas and secure peripherals. Meanwhile, secure firmware is decrypted by the security encryption engine and loaded into the secure RAM area, ensuring protection against leakage and tampering throughout the entire process
Physical-level anti-extraction, key area locked for access only by the security engine, tamper-resistant and read-proof. Supports independent secure zones and CRC verification
Generates high-security random numbers based on physical entropy sources. Certified by NIST for randomness. Provides unpredictability to the system, resistant to prediction attacks
Hardware Unique Key (HUK) with physical isolation protection, unreadable and unclonable, used for secure derivation of application keys
Strict control over debug interface access through authentication mechanisms. Supports authorized access and permanent closure, eliminating physical debug attacks. Meets security management requirements at different stages of the product lifecycle, effectively enhancing overall security
Wireless Connectivity
Wi-Fi Feature List
| Features | Filter | RTL8721Dx | RTL8720E | RTL8710E | RTL8726E | RTL8713E | RTL8730E | RTL8721F | RTL872xD | RTL8735B |
|---|---|---|---|---|---|---|---|---|---|---|
| Frequency | 2.4GHz/5GHz | 2.4GHz | 2.4GHz | 2.4GHz | 2.4GHz | 2.4GHz/5GHz | 2.4GHz/5GHz | 2.4GHz/5GHz | 2.4GHz/5GHz | |
| Bandwidth | 40MHz | 20MHz | 20MHz | 20MHz | 20MHz | 20MHz | 20MHz | 40MHz | 20MHz | |
| Maximum PHY rate | 150Mbps | 114.7Mbps | 114.7Mbps | 114.7Mbps | 114.7Mbps | 114.7Mbps | 114.7Mbps | 150Mbps | 72Mbps | |
| 802.11a | ||||||||||
| 802.11ax (Wi-Fi6) | ||||||||||
| 802.11b/g/n | ||||||||||
| 802.11e/i/w/d/k/v/r | ||||||||||
| WMM/WPA1~3/WPS/ 802.1X/EAP |
||||||||||
| UL LDPC | ||||||||||
| DL STBC | ||||||||||
| Auto Antenna Diversity | ||||||||||
| CSI | ||||||||||
| MCC | ||||||||||
| R-MESH | ||||||||||
| Wi-Fi Card Mode | ||||||||||
| P2P/NAN | ||||||||||
| TWT |
Bluetooth Feature List
| Features | Filter | RTL8721Dx | RTL8720E | RTL8710E | RTL8726E | RTL8713E | RTL8730E | RTL8721F | RTL872xD | RTL8735B |
|---|---|---|---|---|---|---|---|---|---|---|
| Bluetooth Mode | Bluetooth LE | Bluetooth LE | Bluetooth LE | Bluetooth Dual Mode | Bluetooth Dual Mode | Bluetooth Dual Mode | Bluetooth LE | Bluetooth LE | Bluetooth LE | |
| Bluetooth BR/EDR | ||||||||||
| LE Audio | ||||||||||
|
Dedicated antenna for Bluetooth |
||||||||||
| Scatternet | ||||||||||
| LE 2Mpbs PHY | ||||||||||
| LE Long Range | ||||||||||
|
LE Advertising Extensions |
||||||||||
| Periodic Advertising | ||||||||||
| Periodic Advertising Sync Transfer |
||||||||||
|
Direction Finding (AoA/AoD) |
||||||||||
|
LE Isochronous Channels (CIS/BIS) |
||||||||||
| LE Power Control | ||||||||||
| SIG Mesh | ||||||||||
| High-Power Mode | TBD |
Application Scenarios
- IoT doorbell
- Portable AI camera
- Home appliances with AIoT camera
- Edge AI audio-visual recognition demands
- Battery-powered IoT devices
