ADS112C04: Power-Down of I2C Master

Leonard Fritsch

Part Number: ADS112C04
Other Parts Discussed in Thread: ADS1115

Dear Ti Engineers,

I`m planning to use the ADS112C04 for thermocouple (TC) measurement with an automatic power-on and off if the TC is connected or disconnected (See attached Schematic). In this application, I'd like to keep the I²C-Master powered off while the ADS112 is in Power-Down-Mode.

The Pull-Up-Resistors R10 and R11 for the I²C-Interface are powered from the Master, so they will have a LOW-Level while Master is powered off and ADS112 is in Power-Down-Mode. Will this have any influence on the ADS112's behaviour in Power-Down-Mode, e.g. a higher current consumption?

Kind regards

Leonard

over 1 year ago

0 Art Kay over 1 year ago

TI__Genius 17757 points

Leonard,

The SCL line is an input and the SDA line is an input / open drain output. Floating or connecting these pins to GND should not impact the current consumption.

Art

0 Leonard Fritsch over 1 year ago

Prodigy 10 points

Hi Art,

thanks for your reply. I quickly tested it with an ADS1115: The sleep mode current consumption increases from ~ 0,5 µA (SCL, SDA = 3,3V) to ~34 µA (SCL, SDA = 0V). As soon as the ADS112C04 is here, I'm going to test this, too.

Kind regards

Leonard

0 Art Kay over 1 year ago in reply to Leonard Fritsch

TI__Genius 17757 points

Sounds good. Let us know if you have further questions.

Art

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ADS112C04: Power-Down of I2C Master