LM3642 / Slave address, Mode change

Ryuji

Guru 20090 points

Other Parts Discussed in Thread: LM3642, LM3262

Hello,

I have some questions about LM3642.

Please kindly let me know about following.

----

(1) Slave address

Our custoemr use two of the LM3642 as slave by one of the I2C bus.

And LM3642 has one address(1100011) only. so customer can't use two LM3642 by one I2C bus.

Can I use LM3642 by other slave address or are there other slave address device ?

(2)Mode change.

We can change mode by Enable Register or device pins "STROBE pin " and "TX/TORCH pin" to High.

Which method of mode change has priority ?

(3)Processing of STROBE pin and TX/TORCH pin

If we control mode by I2C , should we process STROBE pin and TX/TORCH pin ?

Since these pins are active high, should we tied GND?

Or , these pins have internal pulldown , so can we float these pins ?

Best Regards,

Ryuji Asaka

over 12 years ago

0 Mike Kosteva over 12 years ago

TI__Intellectual 2590 points

I will foward your inquiry to the design team.

0 Ryuji over 12 years ago in reply to Mike Kosteva

Guru 20090 points

Hello Mike san,

Thank you for the fowarding.

I wait the reply.

Best Regards,

Ryuji Asaka

0 Ryuji over 12 years ago in reply to Mike Kosteva

Guru 20090 points

Hello Mike san,

Are there any updating information ?

Could you please kindly let me know current situation?

Best Regards,

Ryuji Asaka

0 Mike Kosteva over 12 years ago in reply to Ryuji

TI__Intellectual 2590 points

HI Ryuji,

I'm working on finding the responsible designer. So this may take a while to get answers to all your questions.

Mike

0 Ryuji over 12 years ago in reply to Mike Kosteva

Guru 20090 points

Hello Mike san,

Thank you for the checking.

Could I have the lead time, if you have any estimation ?

And please kindly let me know the answer if you got one of the answer.

Best Regards,

Ryuji Asaka

0 Ryuji over 12 years ago in reply to Ryuji

Guru 20090 points

Hello Mike san,

Are there any update ?

Sorry for bothering you.

But if there are any updating, please let me know.

Best Regards,

Ryuji Asaka

0 Mike Kosteva over 12 years ago in reply to Ryuji

TI__Intellectual 2590 points

HI Ryuji,

It is taking longer to find a systems engineer who is responsible for the part. I will certainly let you know as quickly as I find out.

Mike

0 Ryuji over 12 years ago in reply to Mike Kosteva

Guru 20090 points

Hello Mike san,

Could you please kindly let me know current situation ?

Can I get the any answer ?

Best Regards,

Ryuji Asaka

0 Sami Kotijarvi over 12 years ago

TI__Intellectual 2510 points

Hi,

I am sorry I did not notice this earlier. I have forwarded the questions to the application responsible of LM3642. I hope to get answers tomorrow. For the item number 1, I can already answer:

The slave address is fixed. We cannot have multiple ones.

Thank you and sorry for this delay.

Regards,

Sami

0 Sami Kotijarvi over 12 years ago

TI__Intellectual 2510 points

Hi Ryuji-san,

Answers to your questions:

1) Only one slave address

2) Strobe

3) Yes

4) Both these pins (STROBE and TX/TORCH) have internal pull downs of 300k to ground.

Thank you,

Sami

0 Ryuji over 12 years ago in reply to Sami Kotijarvi

Guru 20090 points

Hello Sami san,

Thank you for the reply.

1) I understood that LM3262 has one slave address.

2)I understood that Strobe has prior

I'm sorry. which method meaning is "software of register" or "hardware of device pins".

Could you please let me know again ?

3)4) Both theese pins have internal pull downs of 300k to ground.

Thus, can I open both pins when we use this device by I2C control ?

Best Regards,

Ryuji Asaka

0 Sami Kotijarvi over 12 years ago in reply to Ryuji

TI__Intellectual 2510 points

Hello Ryuji-san,

If you are going to control the LM3642 (I guess you had a typo with LM3262?) only through I2C you can leave the STROBE and TX/TORCH pins floating and disable them from register (default value).

If you use both I2C (SW) and pin (HW) controls, you would need to set the pin HIGH and write the register.

Hope this answers to your questions. If not, you can contact me via email.

Thanks,

Sami

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LM3642 / Slave address, Mode change