2.4G band wireless transceiver chip si24r1 summary answer

  This issue is our new technical Q & a series . This series is aimed at demonstrating the functions of a product and answering some common application questions of the product .

      The editor aims at 2.4G Band wireless transceiver chip ——SI24R1, The problems encountered in the development process will be summarized and answered in a unified way . Whether it's the first time you know SI24R1 My new friend , Or have you paid attention to or used it before SI24R1 An old friend of , Your concerns will be answered one by one .

Technical questions

1.Si24R1 You can talk to nRF24L01+ Are they communicating with each other and compatible in software ？

Si24R1 You can talk to nRF24L01+ Communicate with each other , The communication protocol is completely compatible , meanwhile Si24R1 Be able to replace software and hardware compatibility nRF24L01+.

R1 And 01+ There are two differences （Si24R1 Replace nRF24L01+ Need to pay attention to ）：

（1） One is Feature The last bit of the register ,Nordic Whether you set it or not, you will reply ACK,R1 Revised , You set to 1 Will not reply when ACK.

（2）R1 As the receiver , If the ripple is too large , It may cause data demodulation failure , It can be used R1 launch ,01+ Do receiving verification test .

2. We can briefly introduce Si24R1 The advantage of ？

And nRF24L01P Completely PIN Yes PIN compatible , Can be used instead of . Power consumption ：R1 Static power consumption is 1μA,0dbm Emission current ratio nRF24L01P A little higher .R1 Adjustable power , The maximum transmission power is 7dbm, The launch distance is longer , At the same time, the cost is lower .

3.Si24R1 Yes US/CAN/EU Certification ？

These certification requirements are relatively rare , And certified products should be certified , No single chip has been certified , We have customers R1 The finished product passed CE and FCC authentication .

4.Si24R1 What is the packet format ？

Si24R1 Packet based communication , Support multiple communication modes , It can be manually or fully automatic ARQ Protocol operation . A complete ARQ Data packets , Including preamble 、 Address 、 Package control word 、 Load data and CRC. The load data length supports 1~32 Byte dynamic data length .

5.Si24R1 The communication distance is close , In addition to power effects , What else could be the problem , How to adjust ？

SI24R1 The board communication distance is close , It may be caused by many reasons , In addition to the power value setting on the software, there is also a communication mode 、 Communication data length 、 Communication rate and other factors , In terms of hardware, the layout and routing of RF links and the selection of antennas will have a great impact , Usually, there are many problems caused by unreasonable hardware design , It is suggested to carry out R & D and design according to the official reference design .

6.Si24R1 Does it have Bluetooth receiving function ？

Can receive Bluetooth broadcast packets , At the same time, it can simulate the transmission of Bluetooth broadcast packets .

7. If in PCB Make an antenna on ,Si24R1 How much distance can be achieved ?

Si24R1 In an open environment , Distance is achievable 200-300 Rice or so . If onboard PCB The antenna , Try to use common standards 2.4G The antenna , It is not recommended to design at will . Generally, the effect of external antenna is better than that of on-board antenna , The transmission distance will be longer . In theory , The distance of wireless communication can be seen as a combination of two factors , The performance of the communication scheme itself and the actual environment on site . The performance of the communication scheme itself can be expressed by link budget , Link budget = Transmitting power - Reception sensitivity , The higher the link budget , The better the communication ability , It can be considered that the transmission capacity in free space is better ; The actual environment of the site is mainly the attenuation of the transmission medium , air / Barriers can be considered as transmission media , This is about frequency , The diffraction and scattering ability of different frequencies is different . Besides , And interference will also bring changes in transmission distance . Generally speaking , The distance of wireless transmission is mainly related to transmitting power and receiving sensitivity , Antenna gain , And the ability of anti-interference and anti noise .

8.Si24R1 Whether it supports many to one communication or whether it can form a communication LAN ？

Si24R1 Transceivers can be carried out at the same time 6 Senders ,1 Two way or one-way communication between two receivers , Can be directly supported 1：6 Star Network . There is no problem with the composition of the LAN , It is mainly to set the matching method according to the needs , The logical relationship of mutual communication , Theoretically, hundreds of modules can communicate with each other .