SparkFun Qwiic 12 Bit ADC - 4 Channel (ADS1015)

The SparkFun Qwiic 12 Bit ADC is a versatile solution for projects that require additional analog inputs. This device offers four channels of I²C controlled ADC input that can be utilized as single-ended inputs or in pairs for differential inputs. It boasts a programmable gain amplifier, allowing for a detailed focus on small changes in analog voltage. This product is part of the Qwiic system, which requires no soldering for connection, although 2.54mm-spaced pins are also available for those who prefer using a breadboard.

The ADS1015 uses an internal voltage reference for measurements, but also provides a ground and 3.3V reference on the pin outs. This ADC board includes screw pin terminals on the four channels of input, ensuring a solderless connection to voltage sources. It also features an address jumper, allowing the selection of one of four unique addresses (0x48, 0x49, 0x4A, 0x4B). This means you can connect up to four of these on the same I²C bus and have sixteen channels of ADC. The converter offers a maximum resolution of 12-bits in differential mode and 11-bits for single-ended inputs. Step sizes range from 125μV per count to 3mV per count depending on the full-scale range (FSR) setting.

The board also includes an onboard 10K trimpot connected to channel A3, useful for initial setup testing and as a simple variable input to your project. An isolation jumper is also included, allowing you to use channel A3 as needed. Please note that the I²C address of the ADS1015 is 0x48 and is jumper selectable to 0x49, 0x4A, 0x4B. A multiplexer/Mux is needed to communicate to multiple ADS1015 sensors on a single bus.

The SparkFun Qwiic connect system is a comprehensive ecosystem of I²C sensors, actuators, shields, and cables that simplifies prototyping and reduces the likelihood of errors. All Qwiic-enabled boards use a common 1mm pitch, 4-pin JST connector, saving PCB space and preventing incorrect hook-ups due to polarized connections.

Features:

• ADS1015
  • Operating Voltage (V_DD): 2.0V-5.5V
    • (Note: When powering with a Qwiic cable, the input range is only 3.3v)
  • Operating Temperature: -40°C to 125°C
  • Operation Modes: Single-Shot, Continuous-Conversion (Default), and Duty Cycling
  • Analog Inputs:
    • Measurement Type: Single-Ended (Default)
    • Input Voltage Range: GND to V_DD
    • Full Scale Range (FSR): ±.256V to ±6.114V (Default: 2.048V)
  • Resolution:
    • 12-bit (Differential) or 11-bit (Single-Ended)
    • LSB size: 0.125mV - 3mV (Default: 1 mV)
  • Sample Rate: 128 Hz to 3.3 kHz (Default: 1600SPS)
  • Current Consumption (Typical): 150μA-200μA
  • I²C Address: 0x48 (Default), 0x49, 0x4A, or 0x4B
• Screw pin terminals for solderless connection to voltage sources
• Four unique I²C addresses:
  • 0x48
  • 0x49
  • 0x4A
  • 0x4B
• 2x Qwiic connection ports
• Onboard 10K trimpot

Documents:

• Schematic
• Eagle Files
• Hookup Guide
• ADS1015 Datasheet
• Arduino Library
• GitHub Product Repo