Fale sobre a estratégia de controle de seleção de SoC sem fio de baixa potência
Oct 29, 2021
At present, there are more and more options for wireless SoC chips, from the European and American manufacturers to the domestic semiconductors. How to choose a suitable wireless chip for product development? The following aspects need to be considered. Wireless Technology: The current popular low-power wireless technologies are including Wi-Fi, small wireless, LoRa, Bluetooth, Thread, ZigBee, NFC, Private 2.4G, NB-IoT, 2G, 3G, 4G, etc., The wireless technologies commonly used in factory automation and smart home including Wi-Fi, small wireless, BLE, Thread, ZigBee, NFC. The following figure compares the advantages and disadvantages of these different wireless protocols in data transmission bandwidth, distance and power consumption. An appropriate solution should be selected according to the usage scenario. Wi-Fi: Wi-Fi is suitable for high-speed video data transmission, but its power consumption is relatively high. At present, there are fewer mainstream low-power Wi-Fi chips on the market. The core uses ARM M3 or M4 core, which runs simple RTOS, and only supports 802.11b/g/n mode, low bandwidth, but can meet the application of dry battery power supply. ZigBee: The best choice of smart home, the status is being challenged by BLE MESH. But after the launch of ZigBee 3.0, various systems can be interconnected, and the compatibility of the platform is much better than before. Sub-1G: Because of its stability and long transmission distance, it can be used in various industrial control fields. The TX peak current is large, but the system is in sleep mode at other times. Thus, the overall power consumption is low. NFC: The function is which mobile phones must be carried with. Public transportation systems and access control systems are mostly adopted by RFID and NFC solutions. LoRa: Unique spread spectrum technology, +20 dBm transmit power, low power consumption, long-distance, the disadvantage is low bandwidth utilization and low data throughput. Power Consumption Always keep the end users’ experience in mind. If the battery fails, even the most ideal product will be abandoned. What kind of power supply method can be used? Coin cell, dry battery, lithium battery? Coin cells are popular due to their low cost, small size and lightweight. Considering that the battery life of these products is crucial, and the coin cell can only provide a peak current of about 5 mA without being damaged. If you drive a larger current peak, the battery capacity will be affected. RF transmit power: The transmit power of Bluetooth is restively low. Usually, only 5 dBm transmit power is supported, generally refer to 0 dBm transmit power according to specifications. ZigBee, small wireless transmission power can reach 20 dBm. (More than 20 dBm cannot pass the safety test). MCU operating power consumption: Because the same ARM core of the wireless SoC is used, the power consumption is similar to each other. But it is necessary to evaluate the MCU running time from wakes up statu...
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