SPI amplifier breakout for PT100 or PT1000 platinum RTD probes, using the MAX31865 with onboard bias resistor and fault detection. Pair with a PT100 or PT1000 probe for precision laboratory-grade temperature measurement.
Power input. Adafruit Learn states the onboard regulator takes 3-5VDC and should match the microcontroller logic level.
3.3V regulator output. Adafruit Learn states up to 100mA is available.
Common ground for power and logic.
SPI clock input to the MAX31865 breakout. Adafruit Learn states logic pins are level shifted and 3-5V logic safe at VIN logic level.
SPI serial data out from the MAX31865 to the processor.
SPI serial data in from the processor to the MAX31865.
SPI chip-select input, driven low to start a transaction.
Ready/data-ready indicator pin. Adafruit notes their Arduino driver does not use it.
Four terminal-block contacts for 2-wire, 3-wire, or 4-wire RTD sensor wiring. Adafruit Learn notes jumper configuration changes for 2-wire and 3-wire use.
| Pin | Type | Function | Voltage |
|---|---|---|---|
| VIN | Power | Power input. Adafruit Learn states the onboard regulator takes 3-5VDC and should match the microcontroller logic level. | 3-5VDC input |
| 3Vo | Power | 3.3V regulator output. Adafruit Learn states up to 100mA is available. | 3.3V output, up to 100mA |
| GND | Ground | Common ground for power and logic. | 0V reference |
| SCK | SPI | SPI clock input to the MAX31865 breakout. Adafruit Learn states logic pins are level shifted and 3-5V logic safe at VIN logic level. | 3-5V logic, follows VIN |
| SDOMISO | SPI, Signal | SPI serial data out from the MAX31865 to the processor. | 3-5V logic, follows VIN |
| SDIMOSI | SPI, Signal | SPI serial data in from the processor to the MAX31865. | 3-5V logic, follows VIN |
| CS | SPI | SPI chip-select input, driven low to start a transaction. | 3-5V logic, follows VIN |
| RDY | Signal | Ready/data-ready indicator pin. Adafruit notes their Arduino driver does not use it. | 3-5V logic, follows VIN |
| RTD terminal block contacts | Signal | Four terminal-block contacts for 2-wire, 3-wire, or 4-wire RTD sensor wiring. Adafruit Learn notes jumper configuration changes for 2-wire and 3-wire use. |
Power input. Adafruit Learn states the onboard regulator takes 3-5VDC and should match the microcontroller logic level.
3.3V regulator output. Adafruit Learn states up to 100mA is available.
Common ground for power and logic.
SPI clock input to the MAX31865 breakout. Adafruit Learn states logic pins are level shifted and 3-5V logic safe at VIN logic level.
SPI serial data out from the MAX31865 to the processor.
SPI serial data in from the processor to the MAX31865.
SPI chip-select input, driven low to start a transaction.
Ready/data-ready indicator pin. Adafruit notes their Arduino driver does not use it.
Four terminal-block contacts for 2-wire, 3-wire, or 4-wire RTD sensor wiring. Adafruit Learn notes jumper configuration changes for 2-wire and 3-wire use.
I2C · SPI · Single data line · 3.3 – 5 V · Breakout
Verify supply voltage and logic levels before powering up.
Module pins: VIN, 3Vo, GND, SCK, SDO / MISO, SDI / MOSI, CS, RDY. Schematik maps them to your board in the app.
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