LAN9220-ABZJ

It is a full-featured single-chip/Ethernet controller designed for embedded applications with stringent requirements for performance, flexibility, ease of integration, and system cost control. This product is fully compliant and supports variable voltage/signaling that can handle low voltage/signaling without the need for voltage level converters. Featuring an integrated Ethernet and machine bus interface with similar high-performance slave interfaces, the simple yet powerful interface provides glue-free connections for most common 1-bit microprocessors and microcontrollers, as well as 1-bit microprocessors with 1-bit external buses. The integrated checksum offload engine automatically generates bit checksums for received and transmitted Ethernet frames while offloading tasks. Also included are large transmit and receive data to accommodate high latency applications. In addition, with the memory buffer architecture, memory resources can be efficiently utilized by optimizing packet granularity.
Decoders used for security surveillance camera pan/tilts are divided into AC decoders and DC decoders according to the power supply voltage of the pan/tilt. The AC decoder provides AC or voltage to the AC pan/tilt to drive the pan/tilt to rotate. The DC pan/tilt provides DC or power supply to the DC pan/tilt. If the pan/tilt is controlled by variable speed, the DC decoder is required to provide a DC voltage signal to the pan/tilt. Control the variable speed rotation of the DC pan/tilt. According to the communication method, it is divided into one-way communication decoder and two-way communication decoder. The one-way communication decoder only receives the communication signal from the controller and translates it into a voltage/current signal corresponding to the action. The two-way communication decoder drives the front-end equipment. In addition to the performance of the one-way communication decoder, it also sends communication signals to the controller. , so the working status of the decoder can be transmitted to the controller in real time for analysis. In addition, front-end equipment signals such as alarm detectors can be directly input into the decoder to transmit on-site alarm detection signals through two-way communication, reducing the use of cables. According to the transmission mode of communication signals, it can be divided into coaxial transmission and twisted pair transmission. General decoders support communication signals transmitted over twisted pair cables, and some decoders also support or support coaxial cable transmission at the same time, that is, the communication signals are modulated and the video signals are co-transmitted at different frequencies on the same video cable. superior.