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nwdaq-g201:index [2019/01/05 16:52]
qyx [Schematic and PCB layout (prototypes)]
nwdaq-g201:index [2019/10/10 20:46] (current)
qyx
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   - LED is connected directly to a MCU GPIO port. The MCU is running at 1V8 which is not enough for the led. In a hotfix release the LED will be connected to Vbat through a buffer transistor.   - LED is connected directly to a MCU GPIO port. The MCU is running at 1V8 which is not enough for the led. In a hotfix release the LED will be connected to Vbat through a buffer transistor.
   - CP2102N is not able to correctly interpret 1V8 level signal on its RXD input making the serial console unusable. It is possible to make the MCU TXD pin open-drain. In this case it is pulled up to 3V3 by the CP2102N and the console is working properly at 9600 baud. In a hotfix release the current CP2102N in a QFN28 package will be replaced with a QFN24 package featuring a Vio pin.   - CP2102N is not able to correctly interpret 1V8 level signal on its RXD input making the serial console unusable. It is possible to make the MCU TXD pin open-drain. In this case it is pulled up to 3V3 by the CP2102N and the console is working properly at 9600 baud. In a hotfix release the current CP2102N in a QFN28 package will be replaced with a QFN24 package featuring a Vio pin.
 +  - UX issue - the USB port is not accessible when the PCB is mounted in the enclosure. A vertical USB socket should be used.
 +  - The spring antenna performance is very low. It is actually better to use a piece of wire entangled in the enclosure.
  
 BOM: BOM:
  • nwdaq-g201/index.txt
  • Last modified: 2019/10/10 20:46
  • by qyx