TPS61165 EasyScale pulse timing

Hi Naoki,

Thank you for the question. Easy Scale is not a default mode. To enter Easy Scale 1 wire mode, the following digital pattern on the CTRL pin must be recognized by the IC every time the IC starts from the shutdown mode.

1. Pull CTRL pin high to enable the TPS61165, and to start the 1 wire detection window.
2. After the EasyScale detection delay (tes_delay, 100 μs) expires, drive CTRL low for more than the EasyScale detection time (tes_detect, 260 μs).
3. The CTRL pin has to be low for more than EasyScale detection time before the EasyScale detection window (tes_win, 1 msec) expires. EasyScale detection window starts from the first CTRL pin low to high transition.

 
The IC immediately enters the 1 wire mode once the preceding three conditions are met. The EasyScale communication can start before the detection window expires. Once the dimming mode is programmed, it can not be changed without another start up. This means the IC needs to be shutdown by pulling the CTRL low for 2.5 ms and restarts.

There are also some DOs & DON'Ts with the Easy Scale feature in the datasheet (Page 20/33).

Hope this helps. Please let us know if there are still some questions.

Thank you,

-Harini

Hi Harini,

Thank you for your reply.
I understood the Easy Scale recognition.
Can the customer input the signal with transition raise rate 2.3usec to the device?
Is there any oscillation?

Regards,

Naoki Aoyama

Hi Naoki,

With such a fast transition rate, the inrush current most likely be huge, causing a voltage spike at the output.

Please refer to Soft Start-Up in Page 8 of the DS.

Hope this helps.

Thank you,
-Harini

Hi Harini,

Thank you for your reply.

I'm sorry but I don't say that in the case of Start-up.
When the customer write a data 'device address, databyte'.
So I ask you about the input signal with slow rate.
Is there any oscillation or any problem?

Thanks,
Naoki Aoyama

Hi harini,

Thank you for your reply.
I will ask the customer to evaluate sufficiently.

Thanks,

Naoki Aoyama