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TCA9539: Dropped-in options for TCA9539PWR (TSSOP (PW) | 24)?

AnBer
Mastermind 30150 points
Part Number: TCA9539
Other Parts Discussed in Thread: TCA9535, PCA9555, PCA9535

Team,

Question about TCA9539 (TSSOP:24 with Vin max: 5.5V/Vin min: 1.65V):
What are the possible 100% dropped-in replacement for TCA9539PWR in an existing project without HW/SW changes?
Do we have an alternative available today in our portfolio?

- TCA9539QPWRQ1 :
I think that TCA9539QPWRQ1 could be an option if Vin is within 3.6V/1.65V.
Correct? Or are there additional requirements to take into account?

- PCA9539PWR 
Can PCA9539PWR be an option if we make sure that Vin is within 5.5V/2.3V.
are there additional requirements to take into account?

- TCA9535:
The main difference seems to be the that RESET is not present.
Can there be any issues if A2 is interfaced to an existing design that was handling the RESET signal?
are there additional requirements to take into account to use it instead?

- PCA9555 / PCA9535:
I guess same consideration as TCA9535 but additionally Vin is within 5.5V/2.3V.
are there additional requirements to take into account to use it instead?

Thanks in advance!

A,

  • 0
    TI__Guru 73201 points

    Hi A,

    AnBer said:
    - TCA9539QPWRQ1 :
    I think that TCA9539QPWRQ1 could be an option if Vin is within 3.6V/1.65V.
    Correct? Or are there additional requirements to take into account?

    Yes, no hw/sw changes required if you were to choose the Q1 option.

    AnBer said:
    - PCA9539PWR 
    Can PCA9539PWR be an option if we make sure that Vin is within 5.5V/2.3V.
    are there additional requirements to take into account?

    Correct.

    AnBer said:
    - TCA9535:
    The main difference seems to be the that RESET is not present.
    Can there be any issues if A2 is interfaced to an existing design that was handling the RESET signal?
    are there additional requirements to take into account to use it instead?

    The I2C address of TCA9539 is 111 01XX and the I2C address of TCA9535 is 010 0XXX
    You would need to modify SW to change the device address on the static portion.

    AnBer said:
    - PCA9555 / PCA9535:
    I guess same consideration as TCA9535 but additionally Vin is within 5.5V/2.3V.
    are there additional requirements to take into account to use it instead?

    The 9555 has internal ~100k pull ups on its P-Port IOs

    -Bobby