ADS1115: ADS1115 schematic check

switch

Genius 3880 points

Part Number: ADS1115

Hi TI team，

1，Below is the schematic diagram of ADS1115, please help to check if there is any problem?

2，In addition, I would like to know the internal reference voltage and output calculation formula of ADS11115?

over 4 years ago

+1 Scott Cummins over 4 years ago

TI__Mastermind 31655 points

Hello,

For the schematic, the ALERT/RDY pin is an open drain output and should have a pullup to 3.3V or VDD depending on the levels needed for the GPIO it will be connected to.

I'm not quite sure I understand your question about the output calculation formula. The ADC provides an output code directly proportional to the inputs. You can see an example of the LSB size (the voltage corresponding to a single code in the ADC) in Table 3 of the datasheet here:

The internal reference is not a true reference, but a virtual reference, so there is not a specific voltage value for it. You can find some more detailed information in this thread: https://e2e.ti.com/support/data-converters-group/data-converters/f/data-converters-forum/545780/ads1115-internal-reference

Regards,

Scott

Data converters

Data converters forum

ADS1115: ADS1115 schematic check