BQ25606: wrong with the indicator

Hi,

Can you send me your schematic in a different format? Taking a screenshot and putting it in a Word file would be fine.

1) /PG goes low (causing the /PG LED to turn on) when a good input source/adapter is connected, so it seems like /PG might be working correctly. However, when charging is complete, STAT should go high instead of blinking (which would indicate a fault condition).

Please send me the following two waveforms and describe the test conditions for each case:

a) VBUS, REGN, and /PG when you think /PG is behaving incorrectly.

b) VBUS, VBAT, IBAT, and STAT when you think STAT is behaving incorrectly.

2) Please create a new E2E thread with the TPS61169 in the title so that the appropriate team within TI can support your question.

Best regards,

Angelo

Hi Angelo：

      Thank you for your reply.Schematic diagram as above。

The D3 and D4 lights are on all the time when I use a 7V regulator（I use 3.7V dual lithium batteries in parallel）.At this time, VBUS=5.67V; REGN=5.06V; /PG=0.021V and VBAT=4.148V; IBAT=0.653A;  STAT=0.03V.Is this normal? 

Thank you！

Hi,

Thanks for providing that information. The measurements you sent seem normal.

VBUS = 5.67 V, which shows that an adapter is connected, and /PG is low to indicate this. IBAT = 0.653 A, which shows that battery charging is in progress, and STAT is low to indicate this as well. The /PG and STAT behavior seem correct based on the information you provided. I also tried duplicating your test conditions on an EVM, and my results are similar to yours.

Best regards,

Angelo

Hi Angelo：

      Thank you for your reply.

However, I continued to use the voltage regulator to supply 7V, and about 4 hours later, the voltage regulator showed that the output current was 0.01A.And The D3 and D4 lights are on all the time.
At this time, VBUS=6V; REGN=5.93V; /PG=0.018V and VBAT=4.215V; IBAT=0A; STAT=0.025V.

At this time, the charging should be completed. Why is the D4 lamp still on?No go out

Hi Angelo：

      Thank you for your reply.

Yes，charging complete, but STAT still low。

And At this time, VBAT=4.2V; IBAT=0A; STAT=0.024V；SW=4.225V

Question 1：why charging complete, but STAT still low？Whether the length of the battery wire has any effect?

Question 2：How do I set the charging current at 1.3A？

Thank you！

Hi,

Would it be possible for you to capture the waveform I requested? I'd like to see the SW node behavior.

Regarding your other questions:

1) If the battery wire is long, then there could be a significant voltage drop across the wire. Please measure VBAT as close to the IC as possible for higher accuracy. Also, how are you measuring IBAT?

2) You can set your desired charge current by changing the RICHG resistor value. ICHG = KICHG/RICHG, where KICHG is 677. Therefore, in order to set ICHG = 1.3 A, your RICHG resistor should be about 520 Ω.

Best regards,

Angelo