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MAX31856 Thermocouple Amplifier

ET-S19

MAX31856 Thermocouple Amplifier

Universal thermocouple interface, K/J/N/R/S/T/E/B

AED 59.00

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Download datasheet (PDF)

OverviewKey featuresSpecificationsPerformancePinout

Overview

Universal thermocouple interface, K/J/N/R/S/T/E/B

The ET-S19 is built around the MAX31856 — 19-bit, linearised for K/J/N/R/S/T/E/B, internal cold-junction, ±45V input protection, fault detection. It connects over SPI (mode 1/3) (up to ~1MHz through the BSS138 shifters) and is powered from VIN 3.3–5.5V, onboard LDO (IC 3.0–3.6V).

Designed in Dubai by ElectroTrical — the full schematic, BOM and design notes are published below.

Good for

  • Kilns, ovens and reflow controllers
  • Exhaust and engine temperatures
  • Industrial process monitoring

Key features

What makes it different

IC

MAX31856: 19-bit, linearised for K/J/N/R/S/T/E/B, internal cold-junction, ±45V input protection, fault detection

Interface

SPI (mode 1/3), up to ~1MHz through the BSS138 shifters

Supply

VIN 3.3–5.5V, onboard LDO (IC 3.0–3.6V)

Input

Screw terminal, any thermocouple type

Open documentation

Schematic, BOM and layout notes published for every board.

Breadboard friendly

Standard 2.54 mm pitch and M2.5 mounting holes.

Specifications

Technical specifications

Device
ICMAX31856: 19-bit, linearised for K/J/N/R/S/T/E/B, internal cold-junction, ±45V input protection, fault detection
InterfaceSPI (mode 1/3), up to ~1MHz through the BSS138 shifters
SupplyVIN 3.3–5.5V, onboard LDO (IC 3.0–3.6V)
InputScrew terminal, any thermocouple type
Board
Size38.1 × 25.4 mm
Mounting4 × M2.5 holes, 2.54 mm from each corner
Connectors9-pin 2.54 mm header · Screw terminal 2P 5.0mm 17A (THT) — Thermocouple terminal T+ / T−
Main ICMAX31856MUD+T (LCSC C2653162)
RevisionRev B
Software
LibrariesAdafruit_MAX31856 / CircuitPython, ESPHome (max31856)
Solder jumpers
JP1 (default Closed)Cut to turn off the LED

Performance

Thermocouple types

Maximum temperature by typeAnalog Devices MAX31856 datasheet, top of each type's linearised range. The probe's own rating also applies.

Pinout

Pin map and connections

MAX31856 Thermocouple Amplifier pinout: VIN, 3V3, GND, SCK, SDI, SDO, CS, DRDY, FAULT
PinNameTypeFunction
1VINPowerPower in (3.3–5 V)
23V3Power3.3 V regulator output
3GNDGroundGround
4SCKSPI≤1MHz
5SDISPIMOSI
6SDOSPIMISO
7CSSPIActive low
8DRDYOutputConversion ready, active low
9FAULTSignalActive low

Mechanical

Dimensions and what's in the box

Board 38.1 × 25.4 mm with M2.5 holes
Top view · 38.1 × 25.4 mm

In the box

  • 1 × ET-S19 MAX31856 Thermocouple Amplifier (assembled)
  • 1 × 9-pin 2.54 mm male header, unsoldered

Getting started

  • Wire the header: VIN, 3V3, GND, SCK, SDI, SDO
  • Libraries: Adafruit_MAX31856 / CircuitPython, ESPHome (max31856)

Compare

Which temperature probe interface?

MAX31856 Thermocouple Amplifier (this board)This boardET-S20 MAX31865 PT100 RTD AmplifierET-S21 DS2484 1-Wire HubET-S16 TMP117 ±0.1 °C Temperature Sensor
What it doesUniversal thermocouple interface, K/J/N/R/S/T/E/B2/3/4-wire PT100 RTD interfaceI²C to 1-Wire bridge for DS18B20 sensorsMedical-grade accuracy digital temperature sensor
InterfaceSPI (mode 1/3), up to ~1MHz through the BSS138…SPI (mode 1/3), ≤1MHz through shiftersI²C fixed 0x18, up to 400kHzI²C 0x48–0x4B
Best forKilns, ovens and reflow controllersPrecise liquid temperature (brewing, sous-vide)Many DS18B20 sensors on one busPrecision temperature logging
Price59 AED49 AED25 AED39 AED

Downloads

Documents and design files

PDFET-S19 schematicRev BLCSCMAX31856MUD+T datasheet and stockC2653162
STEP3D modelComing soon

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