TPS92682-Q1: SPI read value of current to LED

Luca Testa1

Prodigy 45 points

Part Number: TPS92682-Q1

Hi,

Is it possible, through the SPI interface, to read the value of the current that is sent to the LED ?

Thanks a lot,

Luca.

over 6 years ago

0 Tuan Tran74 over 6 years ago

TI__Mastermind 18890 points

Hi Luca,

We do not have that option. The only thing you can read is your current setting and do math on Rcs to determine the current that you are trying to control to.

Thanks Tuan

0 Luca Testa1 over 6 years ago in reply to Tuan Tran74

Prodigy 45 points

Thanks.

Do you mean that I can read the voltage drop on Rcs by SPI ? It would be fine for me if I just have to do the math to get the current value.

What is the register to read the voltage drop on Rcs ?

0 Tuan Tran74 over 6 years ago in reply to Luca Testa1

TI__Mastermind 18890 points

Hi Luca,

No there is no ADC register for you to read the current. The only register is the commanded current.

Thanks Tuan

0 Luca Testa1 over 6 years ago in reply to Tuan Tran74

Prodigy 45 points

So, what did you mean by "do math on Rcs to determine the current that you are trying to control" ?

I thought you meant that I could read the voltage drop on Rcs by SPI, but now you tell me that I can't....

Thanks for your help !

0 Tuan Tran74 over 6 years ago in reply to Luca Testa1

TI__Mastermind 18890 points

Hi Luca,

You can only read the commanded current not the actual current. The commanded current that you write to Reg 07 and Reg 08 is the current that you are setting the loop to control the current to. Again, you cannot read the actual voltage on Rcs.

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TPS92682-Q1: SPI read value of current to LED