IWR1443: The fluid-level sensing of IWR1443

Hi

I try to use IWR1443 into a fluid-level sensor design.and i also learn much documents from TI about this topic.

1、 I have a question about the low power design. i think TI use the Low power MCU to power down the IWR1443 to lower the power

      Does the response time of IWR1443 after power up is a very important parameter? Could you tell me the data?

2、How can i design a HART circuit of 4mA~ 20mA output base on MCU+IWR1443?

      i read the schematic of TIDEP-0091 but i do not find this design.

Thanks