3. 主動散熱，可將熱氣從 USB 和 Ethernet 空隙中帶走。
Raspberry Pi 4 Case Fan 採用下吹式的主動散熱方式，配合紅白外殼的機構，可有效的將熱氣從 USB 和 Ethernet 處抽走，達到絕佳的冷卻效果。
圖片來源：Designing the Raspberry Pi Case Fan
* Integrated PLL; Transmitter; Receiver; Baseband; and A2D * 76- to 81-GHz Coverage With 4-GHz Continuous Bandwidth * Four Receive Channels * Two Transmit Channels * Ultra-Accurate Chirp (Timing) Engine Based on Fractional-N PLL * TX Power: 12.5 dBm * RX Noise Figure: 14 dB (76 to 77 GHz)/15 dB (77 to 81 GHz)
Built-in Calibration and Self-Test (Monitoring)
* ARM® Cortex® -R4F-Based Radio Control System * Built-in Firmware (ROM) * Self-calibrating System Across Frequency and Temperature
DSP
C674x DSP for FMCW Signal Processing
MCU
* ARM Cortex-R4F Microcontroller for Application Control * I/O; SPI / CAN x 1 * Up to 2 UARTs I2C x 1 * GPIO: 0 ~ 2
Pre-Programmed Firmware "Flavor"
* Vital Signs Detection (VSD) Firmware; for 30cm ~ 90cm wireless & contactless detection of Heartbeat & Respiration Rate * High Accuracy Measurement (HAM) Firmware; for 30cm ~ 300cm distance measurement with millimeter resolution * People Movement Behavior (PMB) Firmware; for detecting People Movement in 4m x 4m or 16 meter-square region for setting geo-fence(s) trigger action * Note: ONLY one of VSD; HAM; or PMB Firmware is pre-programmed within a single mmWave Module
Operating Temperature
0° to 40° degree Celsius
Operating Humidity
10 ~ 85% Non-Condensing
Dimensions & Weight
54.1mm x 45.7mm; 13.7 grams net
《出貨清單》
* mmWave 雷達 x1
* Raspberry Pi BLE HAT 擴充板 x1
* 塑膠螺絲柱 x8
Texas Instruments PCM5122 DAC
– 192kHz Sampling Rate / 24bit Resolution Burr-Brown DAC for best sound quality
– Hardware volume control for best quality using “alsamixer”
Texas Instruments TPS7A4700 Ultra Low Noise Voltage Regulator
Switchable Power Option
– Power from a single microUSB port or independently
Raspberry Pi Power switch
– Turn on and Gracefully shut down Raspberry Pi System
6 GPIO buttons for Media Control
Infrared Receiver and Remote Control
– LIRC compatible
1.3″ OLED display with multi-language support.
– Resolution: 128 x 96
