nRF52 Radio modulation

[albert]

when i Use 2.4G radio to communicate with other modules,like cc2510, i have many questins:

1. as we known that CC2510 ' modulation format of the radio signal ,MSK is only supported for data rates above 26 kBaud. Can we implement this MSK on 52？or  any register can  implement divisions.

[Dmitry]

CC2510 has no modulation modes compatible with nRF52. If you really need to communicate with them, the possible way is to connect a CC2500 transceiver to your nRF52 via SPI.

[huagaojian]

Can we just use nRF52 with FSK modulation mode? 

If so, can we config the division of FSK modulation?

[Dmitry]

nRF52 supports only 1Mbps and 2Mbps bitrates in GFSK mode, CC2510 - up to 250 kbps. Of course you can try a deprecated 250 kbps mode, but it's not recommended and not guaranteed to work (though you may get lucky).

[huagaojian]

Thanks Dmitry,

We came up with this solution because our customer was using CC2510 on their old product and now they are using BLE on their new product. They want to use BLE, but also want to be compatible with the old product at same time. 

nRF 52 series have 2.4G radio module, so we are thinking if we can use 2.4G directly on the chip to save the cost of CC2510 transceiver.

If any other solution, waiting for your reply , thanks very much !

[awneil]

huagaojian said:

nRF 52 series have 2.4G radio module

The "2.4GHz" just describes the carrier frequency at which it works - to be compatible with another radio, it would also have to support a compatible modulation.

Dmitry has explained that there is no such modulation supported by nRF52.

huagaojian said:

They want to use BLE, but also want to be compatible with the old product at same time

Then you're going to have to find a radio which supports that - don't TI have any?

EDIT

huagaojian said:

save the cost of CC2510 transceiver

Note that  Dmitry suggested a CC2500 (which is just the radio) - not CC2510 (which is a complete SoC).

[huagaojian]

awneil said:

Note that  Dmitry suggested a CC2500 (which is just the radio) - not CC2510 (which is a complete SoC).

Thanks awneil,

    For some reason, they don't want to use TI's chip.

    It seems to be no way to use only the nRF52 for compatibility

    Maybe, only TI transceivers (CC2500) with nRF52 SoC is the best way to do this.

Thank you  awneil, Thank you Dmitry 

[awneil]

huagaojian said:

they don't want to use TI's chip

You mean they don't want to use that particular chip, or they won't use any TI chip at all?

Of course, you don't have to use a TI chip - you just have to find something which supports a modulation compatible with the old product.

huagaojian said:

Maybe, only TI transceivers (CC2500) with nRF52 SoC is the best way to do this

You should ask on the TI forums if they have anything else to recommend.