I would like to find any information on configuring the timing generators on the LM98714 AFE. The data sheet does not provide such information. I would like to use this AFE with the upd3719D trilinear CCD sensor. I look forward to learning more about programming the timing generators.
The document linked below will provide the additional operational and register programming information you are looking for.
Please let us know if you need any additional information.
For sensors with an external signal that controls an electronic shutter function, it is possible to shorten the integration time. The "Mode" timing generator can be used to generate an On/Off signal that controls the electronic shutter timing. (See Figure 29 on page 24, Figure 34 on page 28 and the the registers described at the bottom of page 68. (Register Page 4, Registers 0-3).
If sensors do not have an electronic shutter input there is really no way to decouple the integration time from the time required to clock the pixels out. Alternative, if the lamp source can be made dim enough, it is possible to make the integration time requirement always longer than the time for pixel conversion. Then the time can be extended as needed by lengthening the line timing beyond the minimum.
As far as synchronizing motor stepping to line conversion there are several approaches, with a lot of the detail depending on the necessary scan resolution. For low resolution scans it may be necessary to step multiple times per line to achieve the desired resolution. These steps must either be bunched together during a long SH interval as you say, or done smoothly as the image is integrated. You might want to look at the LM9833 datasheet on-line for some insight into the details of this.
While this device is much too slow (2 MHz pixel clock rate in 3 color mode) for modern applications it does have all of the stepper motor functions integrated, and therefore has a lot of that detail described in the datasheet.
I hope this is helpful.
Thank you Jim. The reference to using the mode timing generator is very helpful as is the reference to LM9833.
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.