MAX31855 Cold-Junction Compensated Thermocouple-to-Digital Converter
Precision thermocouple-to-digital converter with a built-in 14-bit analog-to-digital converter (ADC) and cold-junction compensation. Resolves temperatures from -270°C to +1800°C with 0.25°C resolution via a read-only SPI-compatible interface.
Aliase:MAX31855K, MAX31855J, Thermocouple Amplifier, SPI Temperature Sensor
SOIC-8 / DIP-8 Top View
8 Pins
Pinout Table8
| Pin | Signal / Name | Type | Alternative Functions |
|---|---|---|---|
| 1 | GND | Ground | Ground Connection (0V) |
| 2 | T- | Analog | Thermocouple Negative Input (Alumel Lead for K-Type) |
| 3 | T+ | Analog | Thermocouple Positive Input (Chromel Lead for K-Type) |
| 4 | VCC | Power | Power Supply Voltage (+3.0V to +3.6V, typ 3.3V) |
| 5 | SCK | Digital | SPI Serial Clock Input (Up to 5 MHz) |
| 6 | ~CS | Digital | SPI Chip Select Input (Active Low) |
| 7 | SO | Digital | SPI Serial Data Output (MISO - 32-Bit Temperature Word & Fault Flags) |
| 8 | DNC | NC | Do Not Connect (Internally Connected) |