CX93510使用手册

CX93510 JPEG Encoder with a BT .656 Camera Interface and Optional Microphone Input

Conexant’s CX93510 is a monolithic mixed-signal Application Specific Standard Product (ASSP) specifically designed for motion sensors with visual verification. The encoder is controlled through a simple register set via the microprocessor interface. The variety of available interfaces, such as Serial Peripheral Interface (SPI), UART and I 2C, allow for wide flexibility in microprocessor selection. Combined with an external CMOS sensor, the CX93510 retrieves and stores compressed JPEG and audio data in an on-chip 256 KB/128 KB frame buffer so no external memory is required. The ASSP enables low-cost, low-power Passive Infrared (PIR) surveillance camera applications with visual and audio verification.

Upon a motion event, the host processor wakes and configures the CX93510 and begins image/audio captures within 100 ms of motion being detected. The chip has both digital and analog photocell sensor inputs available to facilitate the measurement of ambient light and uses an on-chip LED driver to control an external infrared LED during low-light conditions. The CX93510 supports JPEG and MJPEG-DPCM image compression.

An optional 2:1 scaler provides Quarter Video

Low-cost and low-power solution for wireless and battery-operated cameras

Graphics Array (QVGA) images from the VGA input. The device processes both color and black and white images up to 30 fps.

With t he e lective m icrophone i nput, t he C X93510 records a 2- or 4-bit Adaptive Differential Pulse Code Modulation (ADPCM) audio session simultaneously during image captures. The frame buffer can be optionally configured to contain a 4 KB contiguous memory area for audio data storage. When not enabled, this 4 KB block reverts to video memory use. The stored images and audio data are then passed on to an external microprocessor.

The CX93510 allows for flexible power management options with its internal voltage regulators and I/O connection options. To conserve power, it can remain in a very deep sleep during idle periods until awakened by the host processor. For systems that are battery powered, the CX93510 can operate

between 3.6 V and 1.8 V. A battery measurement input allows the host to monitor the battery level and alert the user if battery replacement is needed.The CX93510 is a flexible, cost-effective, and low-power ASSP ideally suited for security applications requiring visual verification.

Applications

? Passive Infrared Camera ? Wireless Camera ? IP Network Camera ? Remote Home Monitoring ? Personal Emergency Response System ? Baby Monitor ? Nanny/Pet Camera ? Smart Meter

? Video Intercom/Monitor ? Security Intercom

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