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MAX31865ATP+T
TQFN-20 (5x5mm)
The MAX31865ATP+T from Analog Devices is an RTD-to-digital converter supporting PT100-PT1000 sensors, 15-bit resolution, 2/3/4-wire configuration, and SPI interface in TQFN-20.
| Package | TQFN-20 (5x5mm) |
The MAX31865ATP+T from Analog Devices is an RTD-to-digital converter supporting PT100-PT1000 sensors, 15-bit resolution, 2/3/4-wire configuration, and SPI interface in TQFN-20.
The MAX31865ATP+T is an RTD-to-digital converter from Maxim Integrated (now Analog Devices) in TQFN-20, designed to measure PT100 and PT1000 resistance temperature detectors (RTDs) with 15-bit resolution. The device uses a ratiometric measurement technique: a precision current (400uA for PT100, 400uA/10 for PT1000) flows through the RTD, and the voltage across the RTD is measured relative to a reference resistor (RREF) connected across REFIN+ and REFIN-. The ADC output code = (RTD / RREF) x 2^15, so the measurement is ratiometric and independent of the current source accuracy. For a PT100 sensor at 0C (100 ohms) with RREF = 430 ohms: code = (100/430) x 32768 = 7620. The fault detection circuitry monitors for: RTD open (infinite resistance), RTD short (near-zero resistance), reference resistor out of range, and overvoltage/undervoltage on the RTD inputs. The FAULT pin goes LOW when any fault is detected, and the fault type is readable via SPI. The DRDY pin goes LOW when a new conversion is complete, enabling interrupt-driven reads. The device supports 1-shot and continuous conversion modes. The conversion time is 21ms at 60Hz filter (50/60Hz rejection) or 10.5ms at 50Hz filter. The SPI interface operates at up to 5MHz. The internal oscillator eliminates external timing components. The ATP+T suffix specifies TQFN-20, tape-and-reel. Applications include industrial temperature measurement, medical thermometry, and HVAC control.
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | SCK | Input | SPI clock input (from MCU) |
| 2 | SDO | Output | SPI data output (to MCU MISO) |
| 3 | SDI | Input | SPI data input (from MCU MOSI) |
| 4 | CS | Input | Chip select (active LOW) |
| 5 | RTDIN+ | Input | RTD positive input (connects to RTD sensor terminal) |
| 6 | RTDIN- | Input | RTD negative input (connects to RTD sensor terminal) |
| 7 | RTDIOUT | Output | Reference current output (drives RTD, typically 400uA) |
| 8-10 | BIAS/REFIN-/REFIN+ | Input | Bias voltage, reference inputs for ratiometric measurement |
| 11-14 | FORCE-/FORCE+/RTDIN+/AGND | Power/Analog | Force lines, RTD, analog ground |
| 15-20 | VDV/DD/DGND/FAULT/DRDY | Power/Status | Digital supply, ground, fault output, data ready |
| Manufacturer | Part Number | Package | Notes |
|---|---|---|---|
| Maxim | MAX31865ATP+T | TQFN-20 | Same device, Maxim brand |
| Analog Devices | AD7124-4BCPZ | LFCSP-24 | 24-bit ADC, RTD/TC input, higher resolution |
| Texas Instruments | ADS1220IPWR | TSSOP-16 | 24-bit 2kSPS ADC, RTD/TC, lower cost |
| Maxim | MAX31855KASA+T | SOIC-8 | Thermocouple-to-digital, K-type only |
| Analog Devices | AD7793BRUZ | TSSOP-16 | 24-bit sigma-delta, RTD input, low noise |
Brand:
Package:
Cargo cycle: 3~7 Days
The minimum order is 1
Brand:
Package:
Cargo cycle: 3~7 Days
The minimum order is 1
Brand:
Package:
Cargo cycle: 3~7 Days
The minimum order is 1
Brand:
Package:
Cargo cycle: 3~7 Days
The minimum order is 1
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