TXB0102: Help to review the sch and check the input side pin status

Rannie Zhou

Part Number: TXB0102

Tool/software:

Hi team,

Could you please help to review the sch:

My question is: When measuring A1 and A2 with multimeter after power on VCCA and VCCB w/o input signal, the multimeter shows 0, which means that this pin is high impedance? Does that make sense?

BRs,

Rannie

5 months ago

0 Clemens Ladisch 5 months ago

Guru 316470 points

All I/O pins have weak output drivers. Their state will be eigher high or low.

If a pin were high impedance, you would measure inconsistent voltage between the pin and GND, and between the pin and VCC.

0 Rannie Zhou 5 months ago in reply to Clemens Ladisch

TI__Expert 4120 points

Hi Clemens,

Thanks for your reply.

Why we measured 0 in multimeter? Do you have some debug direction? Can you help to review the sch?

BRs,

Rannie

0 Clemens Ladisch 5 months ago in reply to Rannie Zhou

Guru 316470 points

Because they happen to be in the low state.

Why is this a problen?

Logic

Logic forum

TXB0102: Help to review the sch and check the input side pin status