Pinout

ADS1115 16-bit ADC module (I2C, 10-pin breakout) pinout

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Pins

• VDD (2.0–5.5V — power it from the SAME rail as your MCU logic: the module fits 10kΩ pull-ups to VDD on SDA/SCL, so a 5V supply puts 5V on the I2C bus)
• GND (analog and digital ground — this is the reference for every single-ended reading, so it must be common with the circuit you are measuring)
• SCL (I2C clock — 400kHz fast mode, and up to 3.4MHz high-speed mode — already pulled up to VDD on the module, do not add another pull-up)
• SDA (I2C data — already pulled up to VDD on the module)
• ADDR (address select: tie to GND = 0x48, VDD = 0x49, SDA = 0x4A, SCL = 0x4B — the 10kΩ resistor above the pad normally pulls ADDR to GND, so an unconnected board answers at 0x48; wire it anyway if the address matters)
• ALRT / RDY (comparator alert or conversion-ready output, open-drain and active low — needs a pull-up to VDD; leave it unconnected if you poll instead)
• A0 (analog input 0 — must stay between GND−0.3V and VDD+0.3V whatever PGA range you pick: selecting ±6.144V does NOT make a 5V-powered board safe at 6V)
• A1 (analog input 1 — pairs with A0 as the A0−A1 differential channel)
• A2 (analog input 2)
• A3 (analog input 3 — pairs with A2 as the A2−A3 differential channel; 4 single-ended or 2 differential inputs, 8–860 SPS)

Specifications