Tool/software:
Dear, Good morning.
please check my previous question or this.
TLC2543 is an ADC IC that supports SPI communication.
SPI communication speeds support up to 4.1 MHz. [data sheet]
The communication speed we use is 2 MHz.
However, it does not work normally at 2 MHz, of coursely not woring at 4 Mhz,
It only works normally when the communication speed is lowered to 1 MHz.
The first image is the ADC value when set to 2 MHz, and the second image is the ADC value when set to 1 MHz.
It should be about 1685 or so, but most of them are being measured incorrectly.
The test results by SPI communication speed are as follows.
1. 4 MHz: Error
2. 2 MHz: Error
3. 1 MHz: Normal
This design does not use a separate pull-up resistor.
Please check why it is different from the communication speed listed in the data sheet.
Thank you.
