Our current camera products will flicker occasionally in ESD experiment +6K/8KV, especially in contact discharge when contacting the Fakra wire harness connector. Is there a good way to help solve the problem of ESD disturbance rejection?
PS! We connected TVS and other devices near the POC.
Hi Tiki,
For ESD, we do recommend placing the ESD diode closer to ESD source, such as the connector. The ESD diode must also have a low capacitance and a standoff voltage rating, such that the PoC voltage will not trigger the ESD diode. These can be checked in the ESD diode's datasheet.
We also have an App Note that discusses ESD protection in our Ser/Des devices, so I recommend looking through this document:
https://www.ti.com/lit/an/slvaf60a/slvaf60a.pdf
Besides that, here are some general recommendations to improve ESD performance:
Hardware:
Software:
Also make sure to follow a structured and repeatable test procedure, in order to minimize variables in the ESD test.
On a side note, I noticed that the PoC network is structured similarly to the recommended 4G PoC network, provided in the UB953 datasheet, but the components do not match what we recommend in the datasheet.
For example, the Ferrite Beads in the UB953 datasheet are recommended to be 1.5-kOhms@100MHz, but the Ferrite Beads that were used vary between 331-Ohms@100MHz and 470-Ohms@100MHz.
This means the customer is using a custom PoC network and will need to verify that their PoC network will cause no issues in their system. Customer also needs to verify that their PoC network will support the current being drawn. Our recommended 4G PoC network supports up to 150mA.
Best,
Justin Phan
