Adafruit ADS7128 8-Channel ADC and GPIO Expander - STEMMA QT / Qwiic

Name: Adafruit ADS7128 8-Channel ADC and GPIO Expander - STEMMA QT / Qwiic
Brand: Adafruit
SKU: ADA6494
Price: 13.80 GBP
Availability: InStock

by Adafruit

The Adafruit ADS7128 8-Channel ADC and GPIO Expander is a bit of a Platypus of the I2C expander world: hard to categorize as just an ADC or a GPIO expander since it combines the capabilities of both with great capabilites! Usually, you only get ADC or I/O so it's nice to see this combo product.

Featuring the aforementioned ADS7128, it can run on 3.3 or 5V logic and power, and all 8 I/O pins can individually configured to perform either 12-bit SAR analog input, push-pull or open drain digital output, or digital input. This makes it great as a general-purpose glue chip when you want to add more pins or analog/open-drain outputs to a microcontroller or microcomputer.

The ADS7128 also has a lot of fancy extras that make it a good ADC companion even if your main core already has analog inputs. It can run in standalone mode with zero-crossing detection or RMS computation. Not only can it count and track threshold crossings, but it also has an alert trigger output.

Unlike many ADC/expanders, it has two power supplies: the DVDD digital supply and AVDD analog supply are separate so you can use 3V logic for the digital I/O and I2C communications while the analog inputs and digital outputs can be as high as 5V. Or vice versa!

Interfacing is easy - this sensor uses plain, universal I2C. We put this sensor on a breakout board with all the extras needed so you can use it with 3.3V or 5V power/logic microcontrollers. We have written libraries for Arduino (C/C++) as well as CircuitPython (Python 3) so you can use this sensor with just about any kind of device, even a Raspberry Pi!

As if that weren't enough, we've also added SparkFun qwiic compatible STEMMA QT connectors for the I2C bus so you don't even need to solder. Just wire up to your favorite micro with a plug-and-play cable to get analog inputs and digital I/Os ASAP. For a no-solder experience, just wire up to your favorite micro, like the ESP32 V2 Feather using a STEMMA QT adapter cable. The Stemma QT connectors also mean the ADS7128 can be used with our various associated accessories. QT Cable is not included, but we have a variety in the shop.

Technical Details

ADS7128 Specifications

Datasheet & Product Info
8 channels configurable as any combination of:
Up to 8 analog inputs, digital inputs, or digital outputs
GPIOs for I/O expansion:
Open-drain, push-pull digital outputs
Analog watchdog:
Programmable thresholds per channel
Event counter for transient rejection
Wide operating ranges:
AVDD: 2.35 V to 5.5 V
DVDD: 1.65 V to 5.5 V
-40°C to +85°C temperature range
CRC for read/write operations:
CRC on data read/write
CRC on power-up configuration
I2C interface:
Up to 3.4 MHz (high-speed mode)
8 configurable I2C addresses
Programmable averaging filters
Root-mean-square module:
16-bit true RMS output
Programmable RMS time window
Zero-crossing-detect module:
ZCD output corresponding to any analog input
Built-in transient rejection and hysteresis
Digitally adjustable detection threshold

Product Dimensions: 30.5mm x 17.8mm x 4.7mm / 1.2" x 0.7" x 0.2"

Product Weight: 2.1g / 0.1oz

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Primary Guide: Adafruit ADS7128 8-Channel ADC and GPIO Expander A Platypus of the I2C expander world
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The Adafruit ADS7128 8-Channel ADC and GPIO Expander is a bit of a Platypus of the I2C expander world: hard to categorize as just an ADC or a GPIO expander since it combines the capabilities of both with great capabilites! Usually, you only get ADC or I/O so it's nice to see this combo product.

ADA6494

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SKU

ADA6494

EAN

Brand

Adafruit

Stock available

20+ units
Backorder not allowed on this product

Weight

Adafruit ADS7128 8-Channel ADC and GPIO Expander - STEMMA QT / Qwiic

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