DAC43608: About A0 terminal settings

miku.kawaoka

Part Number: DAC43608

I have attached an image.

①This is about the setting of the A0 connector.
The DAC 43608 switches addresses depending on which signal is connected to the A0 connector.
Is there any problem with a circuit configuration that branches from the A0 terminal to each terminal and switches between mounting and not mounting resistors on each board?
The structure is as shown in the attached figure.
The SCL/SDA signal is a branched signal that also connects to the EEPROM, as shown in the figure.

②It is also relevant to question No. 1.
When switching the connection to the A0 terminal with or without a resistor, is a resistance value of 0 (ohm) OK?
If you have a recommended resistance value, please let me know.

③If the signal input to the A0 pin is misdetected due to noise, and it is detected to be none of AGND/VDD/SCL/SDA, how does it behave?

Thank you and best regards,

over 1 year ago

0 Katlynne Jones over 1 year ago

TI__Mastermind 28038 points

Hi Kawaoka-san,

Sanjay will look into this and respond.

Best,

Katlynne Jones

0 Sanjay over 1 year ago in reply to Katlynne Jones

TI__Intellectual 2230 points

Hi Kawaoka-san,

1. It looks okay.

2. SCL/SDA to A0 connection with 0 ohm is okay. GND/VDD to A0 pull- down/up should be through non-zero valued resistor (i.e. - 2500 ohm).

3. I will have a look on this and get back to you ASAP.

Thanks,

Sanjay

0 Sanjay over 1 year ago in reply to Sanjay

TI__Intellectual 2230 points

Hi Kawaoka-san,

This is regarding the signal input to the A0 pin not being detected properly due to noise -

1. Device will operate properly as expected if the noise levels at A0 are within the VIH/VIL recommended condition (data-sheet section 7.3).

2. and if noise levels at A0 is violating the VIH/VIL recommended condition then it will behave as per I2C standards described in the section 8.5 of the DAC43608.

Thanks,

Sanjay

0 miku.kawaoka over 1 year ago in reply to Sanjay

Prodigy 50 points

Thank you for the information.

0 miku.kawaoka over 1 year ago in reply to Sanjay

Prodigy 50 points

Thank you for your response.
Regarding number two.
2500 ohms is an example, is it correct to understand that 4700 ohms and 10 kohms are not a problem?

0 Sanjay over 1 year ago in reply to miku.kawaoka

TI__Intellectual 2230 points

Hi Kawaoka-san,

Yeah, 4.7k or 10k is also. fine.

Thanks,

Sanjay

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DAC43608: About A0 terminal settings