Hi there!
We build the circuit from "Low-Power Battery-Less Wireless Temperature and Humidity Sensor for TMS37157", it works but partially.
- Using the USB debugger from the EZ430-TMS37157 kit I can read temperatures from the sensor, so I2C works properly.
- When I upload the "Palfi Embedded Demo" firmware (without temperature sensor code) I can read registers from our pcb using RF.
- When I upload the "MSP430F22x4 + TMS37157 + SHT21 Wireless Sensor Application" I cannot read the registers using RF anymore.
I'm kind of stuck, it looks like a power issue but I do not know where to look anymore..
When using the "no sensor firmware", RF works and the voltage at pin VCL looks like this:
When using the TI sensor software, RF reads result in CRC error and the VCL voltage looks like this:
The schematics:
Some thoughts about a direction to look into??
