Hi Nxp Team,
Please advice us on the below customer issue.@
NXP PCAL6416AHF,128 - I/O Expander, 16bit, 400 kHz, I2C, 1.65 V, 5.5 V, HWQFN URL NXP: https://www.nxp.com/part/PCAL6416AHF
ISSUE: 10 of the 25 defects. The complete circuit in which this device is used just does not work... "Dead". By replacing them with a good one the circuit works just fine. Please check the two attached images of the imprint on the devices. Defect IO chip.bmp Good.bmp
QUESTION: How to go forth with NXP? Can they recognize something by these imprints and what the possible workaround might be? Maybe a start current being slightly too high or a voltage out of a certain window?
Hi
If so,no more issue about schematic,please contact with NXP local quality team for next failure analysis about the bad part.
Hi
Please show us your application circuit and environment!
Please also do a PCB failure analysis about fail boards to eliminate the solder issue.
Any progress on this issue...guoweisun
Hi Team,
Please find the attachments from the customer as requested.
As requested more information from the customer:
Pull up 1k8 on SDA and SCL lines
Photo of the PCB:
2019-09-30 11.03.06.jpg
Part of the schematic:
image004.png
Part of the PCB layout:
image003.png
Regards,
Siddu
M +919945211348
For your schematic:
1: do you pull up SCL/SDA to VCC?
2: What's VSS value?
Yes, pull up 1k8 on both lines.
VSS si in fact V5s and is 5Volt.