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ADS1219 24-bit ADC - Hardware details

Pinout​

ADS1219 pinout
ADS1219 pinout diagram

Click here for a high-resolution image of the pinout.

Pin details​

Pin MarkingPin NameDescription
GNDGroundCommon ground for power and signals.
VCCPowerSupply voltage, 2.3V to 5.5V (both 5V and 3V3 systems are supported directly).
AVDDPowerAnalog supply for the ADS1219. Tied to VCC by default through jumper JP2 - cut it to feed a separate, cleaner analog supply instead.
SDADataI2C data line for communication.
SCLClockI2C clock line for communication.
AIN0Analog Input 0Analog input channel 0.
AIN1Analog Input 1Analog input channel 1.
AIN2Analog Input 2Analog input channel 2.
AIN3Analog Input 3Analog input channel 3.
DRDYData ReadyActive-low, open-drain interrupt output; asserts when a conversion result is ready. Already pulled up to VCC on the board through a 10 kΩ resistor, so no external pull-up is needed.
REFPReference +Positive terminal for external voltage reference input (optional).
REFNReference -Negative terminal for external voltage reference input (optional).
RESETResetActive-low reset input; pull low to reset the device. Already pulled up to VCC on the board through a 10 kΩ resistor, so it can be left unconnected.
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The ADS1219 accepts a supply voltage anywhere from 2.3V to 5.5V directly, no onboard regulator needed - so it works the same whether you power it at 3.3V or 5V.

Qwiic​

Qwiic cable
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This board is fully Qwiic-compatible! Just plug it into your board using a Qwiic cable and start coding!

Qwiic details and specifications

Learn about hardware specifications, compatibility, and usage of the Qwiic connector.

Timing characteristics​

The ADS1219 supports four programmable data rates, which directly determine conversion time:

Data RateConversion Time
20 SPS50 ms
90 SPS~11 ms
330 SPS~3 ms
1000 SPS1 ms
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Use the DRDY pin as a conversion-complete interrupt instead of polling over I2C to minimize bus traffic and get the lowest possible latency.

Dimensions​

  • Board Dimensions: 22 × 22 mm (0.9 × 0.9 inch)
  • Header Pin Holes: 1.0 mm
  • Screw Holes: Designed for M3 screws (3.2 mm diameter)
  • Soldered boards are LEGO compatible! 🧱

Jumper details​

This board contains hardware jumpers; see below for their locations and functions:

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Photos of the JP1 and JP2 jumpers are not available yet! We're working on it.
JumperDefault StateFunction
JP1NC (Normally closed)Connects SDA/SCL pull-up resistors to VCC for I2C communication.
JP2NC (Normally closed)Connects AVDD to VCC. Cut for a separate, low-noise analog supply.
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The board also has eight additional jumper pads (JP3-JP10) dedicated to I2C address selection - see Address Selection below.

Address selection​

Depending on how you configure the A0 and A1 jumpers, you can define different I2C addresses for the ADS1219:

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Photos of the A0/A1 address jumper configurations are not available yet! We're working on it.
AddressA1A0
0x40 (default)DGNDDGND
0x41DGNDVCC
0x42DGNDSDA
0x43DGNDSCL
0x44VCCDGND
0x45VCCVCC
0x46VCCSDA
0x47VCCSCL
0x48SDADGND
0x49SDAVCC
0x4ASDASDA
0x4BSDASCL
0x4CSCLDGND
0x4DSCLVCC
0x4ESCLSDA
0x4FSCLSCL

Hardware repository​

Schematics, KiCad files, Gerber files, and more can be found in the GitHub repository:

⚠️
The hardware repository for this board is not available yet! We're working on it. In the meantime, please contact us to receive the hardware files.

The hardware repository contains everything you need to understand, modify, or manufacture the board. The different output folders are versioned. You can check which board version you have specifically by finding the version mark on the PCB.

Below is an overview of the available files.

CAD files​

We use KiCad, an open-source PCB design tool. You can open and edit the .kicad_pro project file, which includes both the schematic and PCB layout.

The PANEL files are used internally for production.

Schematic​

The OUTPUTS folder contains the schematic in .pdf format, exported from KiCad.

BOM (Bill of Materials)​

The bill of materials (BOM) is provided in two formats:

  • A standard .csv table, listing all components, part numbers, and values.
  • An interactive BOM (.html) that visually highlights each component on the PCB, making it easy to locate and reference parts.

3D files​

A 3D model of the PCB is available in .step format, allowing you to inspect the board design in CAD software.

Gerber files​

Gerber files are essential for PCB manufacturing, as they contain precise instructions for each layer of the board. The repository includes standard Gerber outputs in a .zip file, such as:

  • Copper layers (.Cu.gbr) - Defines the traces and pads on the board.
  • Solder mask layers (.Mask.gbr) - Specifies the protective solder mask.
  • Silkscreen layers (.Silkscreen.gbr) - Contains text and component markings.
  • Paste layers (.Paste.gbr) - Used for stencil fabrication in SMD assembly.
  • Drill files (.drl) - Provides drilling coordinates for vias and holes.
  • Board outline (.Edge_Cuts.gbr) - Defines the shape of the PCB.
  • Gerber job file (.gbrjob) - Describes the set of Gerber files used for production.

These files are ready for fabrication and can be used in PCB manufacturing.

Compliance​

The Compliance section includes important regulatory and safety documentation for this product. These files ensure compliance with relevant industry standards and legal requirements.

  • CE - Certification document confirming compliance with EU safety, health, and environmental requirements.
  • UKCA - UKCA (UK Conformity Assessed) certification for the UK market.
  • Safety Instructions - Safety guidelines and precautions in English and in German.
  • Info.txt - Contains product details such as SKU, country of origin, HS tariff code, and barcode.