CYRFLTXC Cypress Semiconductor RF Transceiver Wireless USB datasheet, inventory, & pricing. Functional Description. The CYRF WirelessUSB™ LP radio is a second gener- Final data sheet – removed “Preliminary” notation. *F. See ECN. CYRF WirelessUSB(TM) LP GHz Radio SoC The CYRF WirelessUSB(TM) LP radio is a second generation member of Cypress’s WirelessUSB.

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Links to my other pages: What is this all datashset then? If you are not an electronics hobbyist or know much about embedded electronics then be warned, this is going to be very dry reading for you. It is widely used in a huge range of commercial applications but largely unused by hobbyists at the time of writing.

While there are easier to use radio modules and transceivers out there i wanted to use the CYRF for it’s huge versatility and relatively low cost. The CYRF can be used to add wireless radio communication to most modern microcontrollers.

If you want an easy to use solution and don’t mind being somewhat tied by the manufacturer’s design choices datsheet might want to consider the Xbee.

There are lots of online examples on how to use that platform. Existing documentation on the CYRF I am writing this page in the absence of any other resource for hobbyists to use this highly useful, high speed 2. At the time of writing there is very little documentation online about interfacing the various CYRF based RF modules.

I eatasheet not find any example code that helped me configure the CYRF If this changes over time please let me know so i can update this section. The guys at http: The more obvious source of information is the Cypress website. I have a copy of the Datasheet that gives you all the register descriptions but at the moment the one on the Cypress website only gives the a list of the register names.

You will need to go to the Technical Reference Manual for the register descriptions. Every time you run into problems read it again. It does tell you what you need to get this chip to work but it is not always in the most obvious place on the datasheet or the most obvious register on the CYRF The other thing i was looking for on the Cypress website are application notes.

CYRF WirelessUSB LP GHz Radio SoC Datasheet (Japanese).pdf

Unfortunately all of the source code and configuration examples i could find for the Xyrf6936 are written in machine code for a Cypress microcontroller that i have no experience with. While it was worth reading these the only really useful part are the header files for the pin definitions. Artaflex does a reasonable job of documenting any important details that may be different from default when configuring the CYRF in their modules.


I wasted many weeks searching for the correct way to operate that ycrf6936 RF switch. Modules discussed on this page.

Here are the ones i have experimented with: At the time of writing there does not appear to be a full datasheet available for the CYRF 7 that documents the configuration registers. If you have success with any other modules please let me know. It is worth pointing out all 3 modules i have listed use the same 2×6 pin header. This header has 2mm pin spacing which is annoying as it will not fit common prototyping boards but being the same across modules has the advantage of making the modules relatively interchangeable.

It has no other RF switching or amplifying circuitry to deal with so pins 10, 11 and 12 are unconnected.

CYRF6936 Datasheet PDF

More on this in the configuration section. Pins 11 and 12 on the module are outputs of the RF switch status so it is important not to set the logic of these pins. Set your microcontroller to input if it is connected to these pins. The CYRF has no control over this so it must be done in firmware by the microcontroller. This is a simple addition to the TX and RX code. There are a few hidden costs when using these modules. This connector type is used on a few computer wireless network cards eg.

IBM laptops wireless cards and can be found on E-bay. Digi-Key stocks ready made up cables as well. In theory any microcontroller of operating at 2. My project uses Atmel AVR atmega microcontrollers for this. These have built in SPI hardware and more than enough program space for my application. This automated the reply of an ACK packet whenever a module receives a packet. The transmitting module listens for this ACK and only reports a successful transmission if it is received.

Not all modules support Transaction Mode however. The AWA24S for example requires the microcontroller to stitch on and off the RF switch on the module using header pins on the module so it does not support Transaction Mode. The examples shown here presume Transaction Mode is switched off. The header and data portion of the data packet can both be set with either chips or chips.

Without going into too much detail on how the radio in the CYRF works, chips have less immunity to noise and therefore shorter range but higher speed. There are many ways to set up the CYRF That is one of the things that makes it so versatile. One of the things i found intimidating when initially starting with these modules was getting an initial working config from which to start tweaking.

  ISO 14521 PDF

Here i will simply list a working configuration and briefly touch on a few of the aspects a hobbyist may want to change. The following list in the order presented will set the CYRF base configuration.

It is suggested you use these as an initial working config from which you can experiment with making changes later. Setting this bit forces a full reset of the device. The PA setting you will probably want to set to it’s highest power. Probably the most likely bit a user might want to change is the RXOW EN bit which if cleared stops the receive buffer from being over written once it contains valid data.

Most users will want to leave this bit set. Once you have things working you can experiment with other lower power options.

Not really needed as the rest of this setup does not use chip correlators. The Unigen datasheet does not mention this. The first step is to set the CYRF registers for transmission. This causes the CYRF to sit idle with the crystal and synthesizer running. This is counter intuitive. RXGO should only need set when receiving data. I suspect there is a misconfiguration in our clock setup and setting RXGO gets the clock running correctly.

Either way, it works if you set it up this way. Load the CYRF with the following: Load transmit buffer with data.

Monitor the following bytes for transmit status: Downloads Sitemap Links to my other pages: Set various Transmit functions here. This register controls some cryf6936 the built in receive circuitry. The datashheet value shown is configured for reliability rather than speed.

The value here is the recommended from the Datasheet. The CYRF transmit buffer is only 16 bytes long so we will only be discussing transmissions up to this length. Set RX GO which causes the device to transition to receive mode. The buffer is only 16 bytes long so the method described here will only work up to that length.

Tells the CYRF the length of the data being sent and fills the datazheet. This actually transmits the data and tests for successful transmission.

Returns “0” if TX was successful. Returns “1” if TX errors occurred. Incoming data will cause the CYRF interrupt pin to trigger.

Either poll this function often to detect incoming data or run it once when the CYRF interrupt pin triggers.

This function returns “0” if data has been successfully received.