This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
Part Number: ISO7841
We input high signal on OUT pin, and find the signal is pulled to GND. Is it normal symptom?
Are there any internal pull down circuit in ISO7841?
We are glad that we were able to resolve this issue, and will now proceed to close this thread.
If you have further questions related to this thread, you may click "Ask a related question" below. The newly created question will be automatically linked to this question.
In reply to Anand Reghunathan:
This can happen is ISO7841 (or ISOW7841) is used to isolate an SPI device. The isolated device (VCC2 side) only drives the isolated MISO signal when enabled by the chip select signal. Unfortunately, the ISO7841 drives the MISO signal on the VCC1 side, even if MISO on the VCC2 side is not driven by the device. This prevents other SPI devices on the VCC1 side using MISO.
This can be overcome with a three-state buffer (1G125 for example) which allows SPI devices on the VCC1 side to use MISO when the isolated device is not enabled. It would be connected like this....
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.