Other Parts Discussed in Thread: CC1312R
Tool/software:
Simply trying to use the launchpad and custom sensor breakout (...board I designed very similar to TI's sensor booster pack) with 3.7V 3A lithium rechargeable battery. All sensors on custom breakout work just fine using usb with all jumpers in place just the way TI ships it in package. However, in my syscfg file I am using the device (CC1312R) instead of the board (CC1312R Launchpad) as my sensors are configured to gpio pins in a custom way. I am using a UART to stream all sensor data to the terminal (DIO24-TX and DIO30-RX).
The problem I am having is when using external battery power. I remove all jumpers in the line from GRD to SWO and move the LS_PWR jumper from XDS110 power to External power. I connect the battery to 3.3V and ground pins. I get silence. I measure voltage and current with no issue when using an off-the-shelf buck-boost converter but current fluctuates quite a bit around 600 mA where voltage is somewhat stable at 2.88V. This should be enough to get the sensors to burst with data.
Later I used my bench power supply and it works perfectly even up to 5V 2.4A. Then I connected the board to usb with jumper still on external power. Sensors do not work which I expected but when I connect the battery back to the pins while usb to computer, the sensors burst with data in the terminal. I removed the battery and sensors stop. I am no expert...looking at ref designs and researching got me this far. At first it seems I had power issues but now I don't think so...this is weird. I tried a portable battery pack and still no sensor responses. I need to use the launchpad in a wireless fashion without cables to the bench power supply or usb to computer.
What am I doing wrong? If there is a great off-the-shelf breakout for TI launchpads that supplies clean power (if this is the case), please let me know as well.
I thank you all in advance if you respond.
-Derek
