IO-EXPANDER-EVM: PCB schematic : slvua59a.pdf

user5163865 said:

Part Number: IO-EXPANDER-EVM

Hi,

Is Fig.5 in slvua59a.pdf the same as the circuit in which TCA9539 is installed?
Pin No.2 of TCA9539 and TCA6416 is different.
Is A1 of TCA9539 fixed to Hi?

[Bobby] Yes, the A1 pin is tied HIGH if you populate the TCA9539
When changing to TCA9535, is A2 fixed at Low?

[Bobby] No, the A2 pin is tied HIGH if you populate the TCA9535. You can see the RESET_16 net is tied to R8 which is tied to PWR (3.6V according to J1 pin 1 note).

The customer wants a new schematic.
Can TI provide it?

[Bobby] The schematic shown in fig 5 provides the information required for a customer to be able to understand what happens when you populate U2 with a different device other than the TCA6416

Regards,
Hiroshi

-Bobby