Thermocouple Amplifier MAX31855 Breakout Board (MAX6675 Upgrade)

Availability

In stock

MAX31855K K-type thermocouple amplifier breakout with on-board 3.3 V regulator, cold-junction compensation, and SPI output. Reads thermocouple temperature digitally with no analogue input required; upgrade from the MAX6675.

Logical pinout · physical placement not verified

VCC
3.3V power supply (Adafruit breakout accepts 3.3V–5V via onboard regulator)
Type · PowerVoltage · 3.3
GND
Ground
Type · Ground
SCK
SPI clock input
Type · SPI
CS
SPI chip select (active low); must not be shared with other SPI devices
Type · SPI
SO
SPI data output (MISO); read-only device
Type · SPI
MOSI
Not connected — MAX31855 is a read-only SPI device; no data is written to it
Type · SPI
T+
K-type thermocouple positive lead
Type · Analog
T-
K-type thermocouple negative lead
Type · Analog

Pin	Type	Function	Voltage
VCC	Power	3.3V power supply (Adafruit breakout accepts 3.3V–5V via onboard regulator)	3.3
GND	Ground	Ground
SCK	SPI	SPI clock input
CS	SPI	SPI chip select (active low); must not be shared with other SPI devices
SO	SPI	SPI data output (MISO); read-only device
MOSI	SPI	Not connected — MAX31855 is a read-only SPI device; no data is written to it
T+	Analog	K-type thermocouple positive lead
T-	Analog	K-type thermocouple negative lead

Logical pinout · physical placement not verified

Pin details

8 connections

VCC
3.3V power supply (Adafruit breakout accepts 3.3V–5V via onboard regulator)
PowerVoltage · 3.3
GND
Ground
Ground
SCK
SPI clock input
SPI
CS
SPI chip select (active low); must not be shared with other SPI devices
SPI
SO
SPI data output (MISO); read-only device
SPI
MOSI
Not connected — MAX31855 is a read-only SPI device; no data is written to it
SPI
T+
K-type thermocouple positive lead
Analog
T-
K-type thermocouple negative lead
Analog

Start wiring

I2C · SPI · Single data line · 3.3 – 5 V · Breakout

Verify supply voltage and logic levels before powering up.

Module pins: VCC, GND, SCK, CS, SO, MOSI, T+, T-. Schematik maps them to your board in the app.

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Pinout