topic Re: PCA6416A in Other NXP Products

PCA6416A

VidhyaJ — Fri, 10 Jan 2025 10:20:18 GMT

HI Team,

Can PCA6416A IO pins be driven before VCC is applied?

Kindly confirm.

Thanks,

Vidhya

Re: PCA6416A

michs23 — Fri, 10 Jan 2025 10:30:33 GMT

No, the IO pins of the PCA6416A should not be driven before applying VCC. Driving them without power can damage the device and lead to unpredictable behavior. Always apply VCC first, allow for stabilization, and then drive the I/O pins. Refer to the datasheet for specific guidelines and operating ranges.

Re: PCA6416A

TomasVaverka — Fri, 10 Jan 2025 12:41:27 GMT

Hi Vidhya,

The I/O pins should not be driven before VDD(P) is applied as this could lead to unintended behavior or damage. All I/Os are initialized as inputs at power-on and are only functional after VDD(P) reaches its operating level.

BRs, Tomas

Re: PCA6416A

michs23 — Sat, 11 Jan 2025 05:07:27 GMT

No, the IO pins of the PCA6416A should not be driven before applying VCC. Driving them without power can damage the device and lead to unpredictable AZ DMV behavior. Always apply VCC first, allow for stabilization, and then drive the I/O pins. Refer to the datasheet for specific guidelines and operating ranges.

Re: PCA6416A

VidhyaJ — Sun, 12 Jan 2025 13:39:18 GMT

HI Team,

Refer to the link below,

https://www.nxp.com/docs/en/application-note/AN469.pdf

page no: 37, question No:5 specifies it is ok to drive IO pins before VCC is applied.

Kindly clarify.

Thanks,

Vidhya

Re: PCA6416A

TomasVaverka — Sun, 12 Jan 2025 17:02:44 GMT

Hi Vidhya,

The statement in the AN469 regarding PCA9501 IO pins being driven before VCC is specific to that device. The PCA6416A's internal structure differ from the PCA9501 and we do not really recommend applying voltage to I/O pins before VDD(P).

BRs, Tomas

Re: PCA6416A

VidhyaJ — Mon, 13 Jan 2025 04:53:56 GMT

HI Tomas,

can you suggest an I2C based 16bit NXP IO expander part which supports IO pins available before VDD?

Thanks,

Vidhya

Re: PCA6416A

VidhyaJ — Mon, 13 Jan 2025 06:51:59 GMT

Hi Tomas,

Does PCA9539 allows IO pins driven before VCC is applied?

Kindly confirm.

Regards,

Vidhya

Re: PCA6416A

TomasVaverka — Thu, 16 Jan 2025 08:56:14 GMT

Hi Vidhya,

Yes, it does.

BRs, Tomas

Re: PCA9539RBS,118

VidhyaJ — Fri, 17 Jan 2025 06:55:09 GMT

Hi Tomas,

ok. PCA9539RBS,118 meets my requirement of IO pins driven before VCC is applied.

1. But there is a response from NXP that this part will be WIT??

Kindly confirm if this part can be used? or is there any other series for my requirement?

2. I need the following details of the selected part

Confirmation on whether this part is currently ACTIVE
REACH
ROHS
FIT (Failure In Time)
MSL
ECCN
FINISH
EOL
Part Availability for 10 years

Kindly revert.

Thanks and Regards,

Vidhya

Re: PCA9539RBS,118

TomasVaverka — Fri, 17 Jan 2025 07:23:14 GMT

Hi Vidhya,

Regarding the longevity and details in the second question, please create a standard support ticket for my colleagues dealing with such non-technical questions.

BRs, Tomas

Re: PCA9539RBS,118

VidhyaJ — Mon, 20 Jan 2025 05:03:56 GMT

Hi Thomas,

Any feedback on the 1st point?

Thanks,

Vidhya

Re: PCA9539RBS,118

VidhyaJ — Mon, 20 Jan 2025 05:36:16 GMT

Hi Tomas,

what is your feedback on 1st point?

Can you share link to raise support ticket?

Thanks and Regards,

Vidhya

Re: PCA6416A

VidhyaJ — Mon, 20 Jan 2025 06:00:41 GMT

Hi Michs,

PCA9539RBS,118 meets my requirement of IO pins driven before VCC is applied.

Can you confirm the same?

Thanks and Regards,

Vidhya

Re: PCA9539RBS,118

TomasVaverka — Mon, 20 Jan 2025 09:15:24 GMT

Hi Vidhya,

The support ticket (case) can be created here:

https://support.nxp.com/s/?language=en_US

BRs, Tomas

Re: PCA9539RBS,118

VidhyaJ — Mon, 20 Jan 2025 12:53:36 GMT

Thanks Tomas.

I hope I can use PCA9539RPW,118 which meets IO pins driven before VCC is applied.

Regards,

Vidhya