LM3435 - About the setting of the current value by I2C -

Junya Kato

Other Parts Discussed in Thread: LM3435

Hello Team,

Is it possible to control the current value linearly from Imin to Iref
when controlling the current value with internal registers(ADDR:00h to 03h) by I2C?
How do you think about 1024 steps?

Best regards,
Kato

over 8 years ago

0 Clinton Jensen over 8 years ago

TI__Mastermind 25500 points

Hello Junya,

I have sent this to somebody familiar with this device. They should have a response to you soon.

Thanks,

Clint

0 Issac Hsu over 8 years ago

TI__Expert 3920 points

Hi Kato-san,

Sorry for my late reply!

Yes, there is a 10-bit register in LM3435 for current changing from Imin to Iref.

0 Junya Kato over 8 years ago in reply to Issac Hsu

Expert 1635 points

Hello Issac-san,

Does it change linearly?

Best regards,

Kato

0 Issac Hsu over 8 years ago in reply to Junya Kato

TI__Expert 3920 points

Hi Kato-san,

I guess you mean monotonically, right?

Most of the codes are moving up monotonically except after the pattern changes mostly from 1 into 0 and move on to more significant bit, e.g. from say "17F" to "180", "2FF" to "300", etc.

Hope this helps.

0 Junya Kato over 8 years ago in reply to Issac Hsu

Expert 1635 points

Hello Issac-san,

I am asking about the current value which changes according to the register setting.

Is the current value linearly changed by register control as shown in the graph below?

Best regards,

Kato

0 Issac Hsu over 8 years ago in reply to Junya Kato

TI__Expert 3920 points

Hi Kato-san,

It's linear. Yet, as I described in previous note, the current might not monotonically increase as a certain pattern changes.

0 Junya Kato over 8 years ago in reply to Issac Hsu

Expert 1635 points

Hello Issac-san,

Thank you for your answer.
I pretty much got it!

I measure and verify detailed current value by register setting.

Best regards,
Kato

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LM3435 - About the setting of the current value by I2C -