TPS2113: Problem with STAT output

Hi, 

STAT pin operates according to the truth table below. According to your input conditions, STAT pin shooould be going high z.

Could you post your schematic for TPS2113, and scope shots of VSNS, VIN1, VIN2, STAT, OUT during the switching event from IN1->IN2? That would help a lot.

Best

Dimitri

The circuit diagram and timing waveform are as above.
Best regards

HI,

Can you please show IN1 / IN2 in same plot, and more clearly? the photos are very difficult to read, low resolution, so that we can see the timescale?

have you tried swapping the tps2113 and same issue?

best

dimitri

The timing of IN2 and IN1 is as shown in the image below.
IN1 holds 4.2VDC.

Hello,

It would appear that the image did not upload correctly and is showing up as a broken image. Could you reupload the image using the "Insert File" icon on E2E?

sorry
I will upload it again.

Trace 1 is IN2 input (AC adapter is connected)
Trace 2 is IN1 input (internal battery is connected)

Hi,

In this photo, i noticed OUT is going from GND to IN2. Is EN changing at this moment as well? Because thsi would indicate that VIN1 is not present before IN2 comes online. 

best

dimitri

EN is designed to be activated when the AC adapter is connected.
I have confirmed that OUT is switched to IN2 when the AC adapter is connected with the battery connected to IN1.
Is there any problem even if it is used in such a circuit configuration?

There shouldn't be an issue with this. I've checked the schematic (looks fine), and the scope shots you've provided. 
I can't see or think of an issue that would keep stat from indicating properly.

Can you try to swap the IC with a fresh one and report if this issue occurs on that IC as well?

best

dimitri

It's annoying that the STAT signal cannot be detected
For the time being, I was able to realize the function I was thinking of by directly detecting VBUS.
I don't have the circuit board at hand, but I have several, so I will report the result.
Best regards