IWR1443: About the state of the R3 terminal when the power is turned on

Hi Hiroyuki,

Would you be able to clarify which demo you are using?

Cheers,

Akash

Hi Akash,

I'm sorry, I got the wrong terminal number.
The correct terminal number is R5.
Demo is a pre-build binary that comes with SDK 2.1.0.4:
mmwave_sdk_02_01_00_04 / packages / ti / demo / xwr14xx / mmw / xwr14xx_mmw_demo.bin

>Q1. What are these pulses?
I guess that is the output pulse of MSS_LOGGER.
Is this guess correct?

>Q2. Is it possible to not output these pulses?
Please give me some advice.
In our application, the R5 pin is connected to an external MCU as GPIO output.
I want to prevent unnecessary pulses from being applied to the external MCU when the power is turned on.

Regards,
Hiroyuki Taguchi

Hi,

R5 is the MSS logger, this pin outputs the sensor data. It is configured in the demo to do so.

How do you intend to use the device without data output?

BR,

Charles O

Hi Charles,

Thank you for your reply.
Data is output via SPI instead of MSS_LOGGER.
MSS_LOGGER is used as a GPIO pin and outputs status signals to an external MCU.

in the following waveform,
ch2 (cyan): 1.2V power for IWR1443
ch3 (magenta): R5 signal
t1 is the MSS_LOGGER pulse that is output after the power is turned on and before switching to the GPIO pin.
t2 is the status signal output to the external MCU.

The firmware is based on TIDEP-0091 level_sense_demo.
Switching to the GPIO terminal of R5 is performed by the function setGpio0atReset in main.c.
Can I switch to the GPIO pin before the MSS_LOGGER output at t2 starts?

Regards,
Hiroyuki Taguchi

Hi,

Please see linked post for guidance on setting up SPI.

https://e2e.ti.com/support/sensors/f/1023/t/780557?IWR6843ISK-IWR6843

BR,

Charles O