Introduction
Realtek RTL8735B series chip is a new generation of highly integrated WiFi/Bluetooth/Image ISP eight-in-one single-chip solution, featuring a 10x10mm² QFN package. Its ultra-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.
DESCRIPTION
CHIP
Highlights
Armv8M MCU up to 500MHz and 2.23 DMIPS/MHz, with built-in NPU Engine 0.4TOPS computing power.
Integrates Arm v8M high-performance CPU, Dual-Band Wi-Fi, Bluetooth BLE5.1, image ISP H.264/H.265 video encoder, Audio codec, DDR memory, as well as security engine and built-in AI NN engine.
Supports 1080p@30fps + 720p@30fps. Supports 2K@24fps.
Booting up quickly in milliseconds, without missing any images. Ultra-low power consumption in microampere standby mode, suitable for battery-powered applications.
RTOS, IAR, GCC, Arduino IDE.
AI model conversion: yolov3/4/7-tiny, CNN Gray/RGB, and more.
Specifications
- Real-M500 CPU:
- Arm v8M compatible, clock frequency up to 500MHz
- I-Cache 32KB/D-Cache 32KB
- CNN AI Engine:
- 0.4T@INT8/INT16(NPU) computing power
- Memory:
- Embedded 64MB/128MB/ 256MB DDR2/3 memory/clock speed 533MHz
- Internal 768KB ROM/clock speed 250MHz
- Internal 512KB SRAM/clock speed 250MHz
- Supports SPI interface NOR Flash or NAND Flash
- RF Features:
- Wi-Fi 802.11a/b/g/n 1x1 2.4GHz/5GHz
- Supports antenna diversity
- Bluetooth Low Energy, BLE 5.1
- 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
- Supports Secure boot
- Supports Arm Trust-Zone
- True random number generator (TRNG)
- Hardware encryption engine, supports AES and SHA algorithms Hardware encryption engine, supports AES and SHA algorithms
- ECDSA/EdDSA/RSA engine
- Full or partial Flash encryption
- JTAG/SWD debug port password protection
- Flexible design of GPIO configuration
- Multiple communication interfaces, supporting up to：
- 4* UART, baud rate up to 4MHz, all interfaces can be configured as log UART
- 4* I2C, max. clock 400Kbps
- 2* SPI, master clock up to 25Mbps/slave clock up to 31.25Mbps
- 12* PWM, configurable duration and duty cycle from 0 ~ 100%
- * ADC channels, 12-bit mode with max. 31.5KHz
- 59 programmable GPIOs
- 2 GDMA, up to 6 channels each
- Support USB 2.0 Device/Host mode
- Support SD Card (Version 1.0-3.0)/4-bit, up to 2TB card capacity
- Integrated Audio Codec: One output, one input AMIC or 2 DMIC. Up to 96 kHz sampling frequency and 24-bit data width
- Real-M500 CPU:
- Arm v8M compatible, clock frequency up to 500MHz
- I-Cache 32KB/D-Cache 32KB
- CNN AI Engine:
- 0.4T@INT8/INT16(NPU) computing power
- Memory:
- Embedded 64MB/128MB/ 256MB DDR2/3 memory/clock speed 533MHz
- Internal 768KB ROM/clock speed 250MHz
- Internal 512KB SRAM/clock speed 250MHz
- Supports SPI interface NOR Flash or NAND Flash
- RF Features:
- Wi-Fi 802.11a/b/g/n 1x1 2.4GHz/5GHz
- Supports antenna diversity
- Bluetooth Low Energy, BLE 5.1
- 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
- Supports Secure boot
- Supports Arm Trust-Zone
- True random number generator (TRNG)
- Hardware encryption engine, supports AES and SHA algorithms Hardware encryption engine, supports AES and SHA algorithms
- ECDSA/EdDSA/RSA engine
- Full or partial Flash encryption
- JTAG/SWD debug port password protection
- Flexible design of GPIO configuration
- Multiple communication interfaces, supporting up to：
- 4* UART, baud rate up to 4MHz, all interfaces can be configured as log UART
- 4* I2C, max. clock 400Kbps
- 2* SPI, master clock up to 25Mbps/slave clock up to 31.25Mbps
- 12* PWM, configurable duration and duty cycle from 0 ~ 100%
- * ADC channels, 12-bit mode with max. 31.5KHz
- 59 programmable GPIOs
- 2 GDMA, up to 6 channels each
- Support USB 2.0 Device/Host mode
- Support SD Card (Version 1.0-3.0)/4-bit, up to 2TB card capacity
- Integrated Audio Codec: One output, one input AMIC or 2 DMIC. Up to 96 kHz sampling frequency and 24-bit data width
Part Number Comparison
| Part Number | RTL8735BDM―A4 | RTL8735BM―A4 | RTL8735BDM―A9 |
|---|---|---|---|
CPU | Real-M500, 500MHz (2.23DMIPS/MHz) | Real-M500, 500MHz (2.23DMIPS/MHz) | Real-M500, 500MHz (2.23DMIPS/MHz) |
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 |
Embedded DRAM | DDR2 128MB | DDR2 128MB | DDR3 256MB |
Wi―Fi Spec. | Wi-Fi 4 (2.4GHz/5GHz) | Wi-Fi 4 (2.4GHz) | Wi-Fi 4 (2.4GHz/5GHz) |
Bluetooth Spec. | BLE 5.1 | BLE 5.1 | BLE 5.1 |
Package (mm) | QFN128, 10x10 | QFN128, 10x10 | QFN128, 10x10 |
Resources
