We are interested in using the CC2540 for a BLE application. We would like to create a module with it such that it only needs to pass FCC as a module once. We then would like to be able to use the module in a new product, and also any future products if possible. These products include various battery types as well as the equipment side where it will not be battery powered. We plan to solder the module onto any board that we would want to implement BLE. Of course there will be rules for voltages, etc. for a board to work properly with the CC2540 module.
The FCC wants a module to have a regulator, and I see that TI recommends the use of the TPS62730, so we are planning to use it. But since this is to be a module, we can only have basically 1 design. We can only setup the TPS62730 with L and C one time. For example, we cannot tweak it for a lithium primary or secondary(which we will also want to use and which is slightly above the 3.9vMax Voltage). I assume we will get around this by another regulator on the main board. Are there any reasons why using this regulator is not a wise approach with a module?
My question is basically to see if there are some things we are missing in our thinking. Could we run into any trouble with the FCC, or the reliable operation of the CC2540 in this module?
Are there any issues with the FCC having the software stack residing in the CC2540 toggle this part on and off?
Any other advice would be appreciated.
A few comments, I do not think you need a regulator on the module, since the CC2540 has a internal regulator (LDO), for a FCC module approval. However, please check with your certification test hose to be sure.
The TPS62730 is a nce DC/DC when running from a primary battery e..g a coin cell. Please also note that the IO voltage of the CC2540 will be 2.1V. Hence, for a module this may not always be good since the electronics on the main board may not use the same IO voltage.
Hope it helps.
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