Other Parts Discussed in Thread: LDC1612, LDC2114, LDC1000EVM, LDC1612EVM
Hi, Team
My appliance customer is evaluating LDC2114 EVM for touch on metal application. We test LDC2114 EVM with LC sensors cut from LDC1612 EVM and LDC1000 EVM.
I remove the C3~C6 on LDC2114 EVM, connect LC sensor from LDC1612 EVM to IN2/COM, and connect LC sensor from LDC1612 EVM to IN1/COM.
1. Using LC sensor from LDC1612 EVM
The waveform on IN2 pin to GND should be correct. The sensor frequency is about 1.97MHz. The resonant frequency will increase if I put metal close to the snesor PCB coil.
But he data output on GUI is incorrect. I have set freqeuncy to "1MHz to 3.3MHz". No matter how I chagne the Rp setting, Gain setting, and Sensor Cycle
Count setting, it still can not fix the issue. The STATUS register changing between 0x40 to 0x44 frequently, and will be 0xC4 sometimes.
2. Using LC sensor from LDC1000 EVM
The waveform on IN1 pin to GND should be correct. The sensor frequency is about 3.52MHz. The resonant frequency will increase if I put metal close to the snesor PCB coil.
But he data output on GUI is changing between 0 and -1. I have set freqeuncy to "1MHz to 3.3MHz". No matter how I chagne the Rp setting, Gain setting, and Sensor Cycle
Count setting, it still can not fix the issue. The STATUS register changing between 0x40 to 0x44 frequently, and will be 0xC4 sometimes.
How can I make LDC2114 EVM work correctly with LC sensors form LDC1612 EVM and LDC1000 EVM?
Thanks
Kevin Zhang