Hi,
We need to interface the LM98725 with a Toshiba tcd2918bfg linear CCD color (RGB) sensor. Our circuit is as attached (CCD_board.pdf). I'm also attaching a file (tcd2918bfg_timing.pdf) that shows the timing diagram for "bit clamp mode" and the timing diagram for the "line clamp mode". The base conditions are: f(phi)=2.5 MHz, f(RS)=5.0 MHz, tINT (integration time)=11 ms
Q1. I'm having trouble setting up the registers to get the correct timing for them. Can you provide the minimal register setup/values for these two modes (bit clamp and line clamp) based on our circuit and the timing diagram?
Q2. The LM98725 documentation lists SH1 as a "low speed sensor timing output". Toshiba uses "SH" as a label for their shift gate. I assume I can use SH1 for the CCD sensor's shift gate, is that okay?
Q3. There is an external calibration-request pin on the LM98725. Is it necessary to initiate the calibration through this pin or can we initiate it through the registers/spi as well?
Q4. Can the unused clock pins be used as GPIO (output-only is okay)?
Thanks in advance.
CCD_board.pdf