TLC5940: TLC5940RHBR

Hi,

First, we don't recommend to try out a timing that doesn't match on our datasheet. As you can see in datasheet, the GSCLK will be effect after the BLANK signal.

For your questions, actually, we don't know the status as you said since we always follow up the timing sequence.

BR, Jared

Thank you for your answer.

When device is power ON and OFF,Outn output Level is suppoused to be each one status High,Low or HiZ.

So,LED is turn on,blink or turn off.

We also assume that Outn is different status each 1st power ON/OFF the 2nd power ON/OFF ..... 

Did our understandings correct? 

We are sorry we return to reply you late.

We mean that we observed its following phenomenon.

After n times power on it's OK but next after power on it's not OK like a blink LED.

And then,after the next power ON it's OK.  

What do they might another think its phenomenon?

Hi

Thank you for your advise.

If GS Counter wasn't set correctly like GSCLK and BLANK level is HiZ.

If above situation,why are OUTn signal levels going to be LOW level.  

Could you tell me what happens to the Driver status more detail.

Hi,

If the BLANK signal is high, the output will be off since the BLANK signal is to control the output.

BR, Jared

Hi

Thank you for your advise.

I said that it's not good expression.

I'm sorry for your confusing.

If GS Counter wasn't set since GSCLK and BLANK were given no signal.

I think GS Register wasn't set that it was unstable.

Is that correct?

If that so,If above situation,why are OUTn signal levels going to be LOW level. 

Could you tell me what happens to the Driver status more detail.

We'd like to know OUTn signal how working and status through inside the Block Diagram Circuit details are.

Hi,

Actually, I don't understand your question here clearly.

What do you mean about

"

If GS Counter wasn't set since GSCLK and BLANK were given no signal.

I think GS Register wasn't set that it was unstable.

Is that correct?

If that so,If above situation,why are OUTn signal levels going to be LOW level. 

"

My understanding is that you set the GS counter while the GSCLK and BLANK is low and you see the outputs are still low after you set the GS Register?

Am I correct?

BR, Jared

Hi,

I'm sorry about confusing.

Your understanding are correct.

I'd like to say,

I set the GS counter while the GSCLK and BLANK is given no signal and I see the outputs are low before you set the GS Register.

Above situation,why are the OUTn signal levels going to be LOW level. 

We'd like to know OUTn signal how working and status inside the Block Diagram Circuit more details are.

Hi,

Ok, I see it. I'd like ask one question. After you set the GS counter while the GSCLK and BLANK is low, did you pull up the BLANK signal and set the LAT signal?

BR, Jared

Hi,

I'm terribly sorry give you a question again and again.

Let me tell you our product status.

While It power SW turns OFF,the LED driver doesn't supplies power.

While it power SW turns ON,the LED driver supplies power at last.

While it powers SW turns ON,

the BLANK doesn't pulls up and the XLAT pulls up.

Before it turns off which means power OFF,the LED driver doesn't supplies power.

We believe that the LED driver is unknown status.

So when we turns ON,the LED driver is unknown status until the setup is completed.

Are we correct. 

We upload the signal wave and the Cicuit Diagram.

Thanks.

20240927 TI Question.pdf

Hi,

Since our expert is OoO and during the China National Day, please forgive the late reply.

BR, Jared