The CH9256C is a USB 2.0 HS/FS- and UVC-compliant camera controller designed for USB imaging and video applications. It integrates a high-performance USB 2.0 transceiver, an advanced image-processing architecture, flexible peripheral control interfaces, an embedded MCU, and power management circuits into a single-chip solution.
The integrated ultra-low-power USB transceiver provides excellent compatibility with various USB host platforms while delivering stable high-speed data transmission and optimized image quality.
The CH9256C is suitable for a wide range of USB camera applications, including webcams, AI cameras, industrial cameras, and embedded vision systems.
—USB 2.0 Controller
CH9256C integrates a USB 2.0 High-Speed/Full-Speed-compliant transceiver and protocol controller optimized for efficient utilization of the 480 Mbps USB bandwidth to support high-quality video streaming applications. The device supports UVC 1.0-, 1.1-, and 1.5-compliant video streaming, ensuring broad compatibility with major operating systems and USB host platforms.
—Image Signal Processing Unit
CH9256C integrates a 14th-generation ISP engine that supports comprehensive UVC image controls and advanced restoration features. In addition, this ISP includes functions such as Lens Shading Correction, Dead Pixel Correction, Color Correction Matrix, histogram-based Auto Exposure, and gray-world-based Auto White Balance. To achieve superior low-light performance, the ISP deploys a dual-mode noise-reduction framework: a hardware-based 4th-generation Temporal Noise Reduction (TNR) engine for high-throughput, low-latency stream processing, complemented by a software-implemented 8th-generation TNR algorithm for advanced, scene-adaptive noise suppression.
—Image Sensor Interface
CH9256C incorporates a two-lane MIPI CSI-2 interface for direct connection to CMOS image sensors. The interface supports multiple data rates and pixel formats, enabling flexible integration with image sensors ranging from VGA (640×480) up to 5 MP (2592x1944) resolution. Broad compatibility with mainstream CMOS image sensors simplifies system integration for USB camera and embedded imaging applications.
—Audio Interface
CH9256C integrates a PDM interface for direct connection to digital MEMS microphones (DMICs), supporting mono or stereo 16-bit audio capture at sampling rates of 8 kHz, 16 kHz, 24 kHz, and 48 kHz. The integrated audio interface reduces external component count and simplifies PCB design. Audio data can be synchronized with USB video streaming for integrated audio and video applications.
—Built-in Regulators
CH9256C integrates four internal LDO regulators to reduce external component count and PCB area requirements.
The integrated regulators provide dedicated power domains for core logic, sensor analog power, sensor I/O power, and peripheral I/O power.
Configurable output voltages include 1.2 V, 1.8 V, and 2.8 V to support both the controller core and external CMOS image sensor power requirements.
—Wide-Range System Clock Output
CH9256C supports programmable system clock generation with dynamic frequency adjustment for performance and power management optimization.
Programmable clock outputs up to 48 MHz are provided for external image sensor operation.
Flexible clock configuration enables compatibility with a wide range of CMOS image sensors while reducing external clock generation components and PCB complexity.
