LP5012: Delay is observed when individual LEDS are turned ON simultaneously using I2C command

Hi Shofana,

Can you please show me your waveform pattern?

BR, Jared

Hi Jared, 

Sorry for delayed response 

Let me explain you the behaviour in detail. 

When I executed the above mentioned I2C command,  a small delay occurs between the each LED's before turning ON.

Due to this delay, the LED's appears to be turned on one by one rather than all at once.

Please find the snapshot for more info

Thanks,

Shofana M.

Hi Shofana,

Thanks for your reply! Do customers still have any other problems?

BR, Jared

Hi Jared,

No. This was the only issue reported.

Please let me if you needed any other inputs.

Thanks,

Shofana M.

Hi Shofana,

Thanks for your reply!

Can I know the information about end equipment and customer? And why they need to control the LED with a small delay? Thanks!

BR, Jared

Hi Jared,

The end equipment is Access Point. 

I would like to confirm one more point as there is a misunderstanding.

The customer is willing to control group of LEDs at same time without any delay but couldn't. 

The small delay that we observed is not desired and could you let us the reason for delay.

Also, Is there anyway that we can control the group of LEDs instead of individual one.

Thanks,

Shofana M.

Hi Shofana,

Do you mean that customers found the delay is our IC problem?

Can you please show me the program steps to control the LED on/off?

BR, Jared

Hi Jared,

Yes, the delay observed is the issue.

The i2c command which I shared was used to control LED on/off

Thanks,

Shofana M.

Hi Shofana,

Can you please help to capture the interface waveform and output waveform? Only according to the I2C command above, I think there is no problem for that.

BR, Jared

Hi Jared, 

Apologies for the late reply. 

We have captured the I2C Interface, Output Waveform and also prepared a report for your analysis.

During this time, we observed a delay of 12.8ms between each LED to get turned ON. 

LED 1 - LED 2 = 12.8 ms

LED 2 - LED 3 = 25.6 ms

LED 3 - LED 4 = 38.4 ms

LED 4 - LED 5 = 51.2 ms

LED 5 - LED 6 = 64 ms       This way the delay gets added on for each LED

I couldn't attach the report in this forum. If possible please provide your email address, so I can send you the report via mail. 

Thanks, 

Shofana M.

Hi Jared, 

Below are the Interface and Output waveform captured while executing the provided I2C command. 

As mentioned earlier, there is a delay of 12.8ms between each LED to get turned ON. 

Please check and let me know your observations