The PIR Camera Solution implemented around Atmel’s SAM3S Cortex-M3 based MCU is particularly well suited for this kind of application and provides ready to use hardware and software blocks. The SAM3S PIO Controller integrates an interface able to read data from a CMOS digital image sensor and store images in internal or external memory with the CPU being in sleep mode, thus optimizing power consumption when running from batteries. One important requirement is the image compression process for transmitting images to optimize transmission time and power consumption. Compared to higher priced CMOS imaging sensor devices with embedded JPEG compression, the SAM3S device is able to perform JPEG compression through more simplified software process.

Other features, such as low-power analog comparator or analog-to-digital converter for motion detection, low-power modes and PIO state preservation (even in backup mode), simplify the design by reducing the count of external components, board space and therefore, overall system cost.

- Performance improvement with 120MHz max frequency instead of 64MHz (SAM3S). We can achieve up to 24fps in QVGA color which is market need.
- Flash and SRAM memories with 1MB Flash and 128KB SRAM instead of 256KB/48KB (SAM3S) allowing to perform JPEG compression "On the fly" and save the cost of external PSRAM memory (BOM cost).

详见：Atmel-PIR Camera