Other Parts Discussed in Thread: PCA9555, PCF8574
Hi,
Good Day. I have a customer who is working with PCF8575. Please see below his query for your reference. Thank you very much.
I am currently creating a board with the following IO-Expanders:
PCF8575 PCF8574 PCA9555
I have to use some of the IOs as Inputs and wonder if I can use it without external Pull-up Resistors.
The datasheet for the PCA9555 shows a 100 kOhm to VCC => seems to be okay.
The datasheet for the PCF8574 shows a 100 µA at 8.2.2 Simplified Schematic Diagram of Each P-Port Input/output => seems to be okay.
The datasheet for the PCF8575 shows a 100 mA (0.1 A) at 8.2.2 Simplified Schematic Diagram of Each P-Port Input/ Output?
Is this 100 mA correct in the Datasheet or do I misunderstand this value?
100mA per Input seems to be a very high value. e.g. when using maybe 8 Inputs with the internal "pull-up".
Best Regards,
Ray Vincent
