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MCP3421 - 18-bit 1-channel I2C ADC - STEMMA QT/Qwiic - Adafruit 5870
The MCP3421 from Adafruit is a single-channel 18-bit ADC with an I2C interface, supporting a sample rate of up to 240 SPS . Featuring differential inputs, a programmable amplifier (from 1x to 8x), a built-in precision voltage standard (2.048 V ± 0.05%), and selectable resolution from 12 to 18 bits . Great for reading sensors such as strain gauges, thermocouples, and pressure sensors. Compatible with STEMMA QT and SparkFun Qwiic , it enables quick connections to development boards without the need for soldering.
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Product description: MCP3421 - 18-bit 1-channel I2C ADC - STEMMA QT / Qwiic - Adafruit 5870
The MCP3421 from Adafruit is an advanced yet easy-to-use 18-bit ADC with an I2C interface that is ideal for applications requiring high precision. It supports sample rates from 240 SPS (12-bit) to 3.75 SPS (18-bit), making it ideal for reading slowly changing signals from differential sensors such as strain gauges , thermocouples, and pressure sensors . The built-in voltage reference (2.048 V ± 0.05%) and programmable amplifier (from 1x to 8x) provide stable and precise measurements. With STEMMA QT connector compatibility with SparkFun Qwiic , the MCP3421 allows for quick and convenient connection to other modules without the need for soldering . Leads on standard pins and a screw connector increase the versatility of applications. An excellent choice for engineers and hobbyists.
MCP3421 - 18-bit 1-channel I2C ADC - STEMMA QT / Qwiic - Adafruit 5870.
Botland is an official distributor of Adafruit electronics. These dependable American solutions cover sensors, controllers, Arduino shields, educational systems, smart building and a wide range of accessories. The Botland range holds original Adafruit products only.
Single-channel ADC with I2C interface.
Main features of the transducer
- 18-bit ADC: provides high precision analog signal measurements
- I2C interface: enables communication with microcontrollers at frequencies up to 3.4 MHz
- Differential inputs: allow measurement of positive and negative signals in the range of 0 V to 2.048 V
- Programmable Gain Amplifier (PGA): 1x to 8x gain adjustment for better signal conditioning
- Precision Voltage Standard: Built-in 2.048 V ± 0.05% standard ensures stability and low drift (15 ppm/°C)
- Supports various resolutions: from 12-bit (240 SPS) to 18-bit (3.75 SPS)
- STEMMA QT compatibility with SparkFun Qwiic: makes it easy to connect to other modules without soldering
- Mounting options: pin-out and screw-in connectors allow for flexible use
Module pins
- VIN: power supply (3 V to 5 V DC), adapted to the logical level of the microcontroller
- GND: ground, common for power and logic
- SCL and SDA: I2C clock and data lines with built-in 10k pull-up resistors
- V+ and V-: differential inputs enabling measurement of analog signals in the range of 0 V to 2.048 V
SparkFun Qwiic-compatible STEMMA QT connectors allow for quick and convenient connection to other modules.
Transducer programming
The MCP3421 works with the Adafruit_CircuitPython_MCP3421 library, which allows for easy configuration of parameters such as resolution (from 12 to 18 bits), operating mode (continuous or single-shot), and gain. The Python or CircuitPython code gets you started quickly, and the ADC reading example makes it easy to learn. Operation is via the I2C bus, and the documentation provided covers all installation steps.
MCP3421 Technical Specifications
- Resolution: 12 to 18 bit
- Sampling rates:
- 3.75 SPS (18-bit)
- 15 SPS (16-bit)
- 60SPS (14bit)
- 240 SPS (12-bit)
- Input voltage range: 0 V to 2.048 V (differential)
- PGA Amplifier: 1x, 2x, 4x, 8x
- Voltage standard: 2.048 V ± 0.05%
- Interface: I2C (address 0x68)
- Dimensions: 25.4 x 17.8 x 12.3 mm
- Weight: 3 g
Kit Contents
- 1x Adafruit MCP3421 18-bit ADC Module
- 1x 6-pin connector
Items included in the set.
Useful links
- Manufacturer's website: Adafruit 5870
- User Guide
- MCP3421 Technical Documentation
- Module pins
- CircuitPython and Python Software
- GitHub Repository
- ADC Converter - What is it and what is it used for?
| Name | Value |
|---|---|
| Width | 7.5 cm |
| Height | 12 cm |
| Depth | 1 cm |
| Weight | 0.004 kg |
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This product is a component intended for further assembly or prototyping. It is not a finished product within the meaning of the product safety regulations.
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