nrf automotive grade

[pavan]

Hello all,

I am in the design stage of custom board for Automotive application using nrf51824. i have the below queries,

1. In the below link there are two reference layouts which one i have to chose? whether nRF51x22-CxAx Reference Layout 1_3 or nRF51x22-QFAx Reference Layout 2_4 please advice?

2. this particular "BAL-NRF02D3" part number is used for RF antenna please provide information on this?can i use the PCB antenna for same?

3. in my application we are just pushing the data through UART pins to smartphone? which pins can be configured as UART pins?and how to initialize the data packets to send it to the smartphone?

please clarify

[Jørgen Holmefjord]

Hi,

1. This depends on which package of the chip you are planning to use. nRF51x22-CxAx Reference Layout 1_3 are for CSP packages and nRF51x22-QFAx Reference Layout 2_4 are for QFN package. Looking at the nRF51824 compatibility matrix, this chip is only available in QFN package.
2. The BAL-NRF02D3 (BAL-NRF01D3 should be used for QFN packages) is a balun, used for converting signal from balanced to unbalanced. The part also include matching network and harmonics filter. You can read more about baluns in this and this thread.
3. Any of the GPIO pins can be used for UART. Please have a look at the UART peripheral example, and the BLE UART example in our SDK.

Best regards,

Jørgen

[Jørgen Holmefjord]

You can chose to use the balun or a discrete matching network. Have a look at this answer for more details. You will also need antenna with both alternatives