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Analog Devices Inc./Maxim Integrated MAX31850TATB+
- Part No.:
- MAX31850TATB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Sensor and Detector Interfaces
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX31850TATB+.pdf
- Description:
- IC CONV THRMCPLE-DIG T TYPE TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,488
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Product details
Overview
MAX31850TATB+ from Maxim Integrated is a cold-junction compensated, 1-Wire thermocouple-to-digital converter optimized for Type T thermocouples. It delivers 14-bit resolution (0.25°C), supports -270°C to +400°C thermocouple range, features integrated open/short fault detection, and operates with parasite or local VDD power. It is used in industrial temperature monitoring where distributed, low-wiring-count sensing is required.
For engineers reviewing the MAX31850TATB+ datasheet, MAX31850TATB+ pinout, MAX31850TATB+ application, or MAX31850TATB+ equivalent, key selection considerations include its 0.25°C resolution, Type T thermocouple calibration, parasitic-power capability, 1-Wire multdrop support, and ±2°C thermocouple accuracy over -270°C to +400°C.
Technical Context
The MAX31850TATB+ integrates a precision 14-bit ADC, dedicated cold-junction temperature sensor (±2°C error), and analog signal conditioning circuitry tailored to Type T thermocouple's 52.18 µV/°C sensitivity. Its internal conversion path includes switch-controlled routing (S1–S5) to isolate thermocouple inputs during cold-junction measurement and fault detection phases.
It implements full 1-Wire protocol compliance-including presence detection, time-slot timing (60–120 µs slot), and CRC-8 validation-with a unique 64-bit ROM ID. The AD0–AD3 address pins configure location mapping, and fault status bits (open, short-to-GND/VDD) are embedded directly in scratchpad bytes 2 and 3.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Thermocouple Type | Type T (copper/constantan), factory-trimmed for 52.18 µV/°C nominal sensitivity |
| Temperature Resolution | 0.25°C (thermocouple), 0.0625°C (cold-junction), enabling fine-grained thermal profiling |
| Thermocouple Range | -270°C to +400°C - covers full operational span of Type T sensors including cryogenic use |
| Accuracy (Thermocouple) | ±2°C (−270°C to +400°C, TA = −40°C to +125°C), excluding thermocouple nonlinearity correction |
| Cold-Junction Error | ±2°C (TA = −40°C to +100°C), ensuring reliable ambient compensation across industrial environments |
| Conversion Time | 72–100 ms per full cycle (thermocouple + cold-junction + fault detection), deterministic for scheduling |
| Power Modes | Local VDD (3.0–3.7 V) or parasite power via DQ - eliminates external supply in space-constrained nodes |
Pinout & Package
TDFN-EP (3mm × 4mm, 10-pin, exposed pad). Pin 10 (DNC) is unconnected; EP may be grounded or left floating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Common return for thermocouple, internal circuitry, and parasitic power discharge path |
| T− (Pin 2) | Thermocouple negative input | Connected to constantan wire; must not be shorted to GND to avoid fault false positives |
| T+ (Pin 3) | Thermocouple positive input | Connected to copper wire; forms differential input pair with T− for noise-rejected voltage sensing |
| VDD (Pin 4) | Supply voltage input | Required for local power mode; must be tied to GND in parasite-power operation |
| DQ (Pin 5) | 1-Wire data I/O & parasite power | Open-drain bidirectional bus interface; supplies device current during high bus states via CPP capacitor |
| AD0–AD3 (Pins 6–9) | Location address inputs | Hardwired LSB–MSB address bits (0–15); read back via configuration register byte 4 for multi-node mapping |
Key Features
| Feature | Design Value |
|---|---|
| Integrated cold-junction compensation | On-die temperature sensor with ±2°C accuracy enables true remote junction measurement without external ICs |
| Type T–specific analog front-end | Factory-calibrated gain and offset for 52.18 µV/°C response eliminates software linearization for base-range measurements |
| Hardware fault detection | Dedicated circuitry flags open thermocouple, short-to-GND, and short-to-VDD on T+/T− - reported in scratchpad byte 2 |
| 1-Wire multdrop architecture | Single microcontroller can manage >100 units on one bus using unique 64-bit ROM IDs - reduces wiring and GPIO count |
| Parasite-power compatibility | Operates with no local VDD; powered entirely from 1-Wire bus via DQ - ideal for sealed or inaccessible sensor nodes |
Applications
| Industrial Process Monitoring | HVAC System Control |
|---|---|
Use Scenario: Real-time temperature logging across kilometer-scale boiler feedwater lines with minimal cabling. IC Role / Device Role / Timing Role: Direct thermocouple digitization and cold-junction compensation at point-of-sense; 1-Wire bus enables daisy-chained deployment. Use Value: Eliminates analog signal degradation over long runs and removes need for centralized signal conditioning hardware. |
Use Scenario: Distributed duct temperature sensing in commercial HVAC with zone-level feedback control. IC Role / Device Role / Timing Role: Local cold-junction compensated Type T conversion; AD0–AD3 pins assign fixed physical locations for automated commissioning. Use Value: Reduces installation labor by 60% vs. RS-485 nodes; enables plug-and-play sensor replacement without reconfiguration. |
| Medical Sterilization Validation | Appliance Safety Monitoring |
Use Scenario: Multi-point temperature verification inside autoclave chambers during steam sterilization cycles. IC Role / Device Role / Timing Role: High-accuracy Type T interface with fault detection; operates reliably at up to +125°C ambient. Use Value: Ensures regulatory compliance (ISO 17665) by detecting open thermocouples before cycle start - preventing invalid batches. |
Use Scenario: Overtemperature cutoff in induction cooktops using embedded Type T sensors near heating coils. IC Role / Device Role / Timing Role: Fast 100 ms conversion with integrated fault reporting; VDD-powered for robustness under EMI-rich conditions. Use Value: Enables Class B safety certification by providing fail-safe open-circuit detection within <1 s of disconnection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar thermocouple-to-digital conversion applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX31855KASA+ | Thermocouple type K only; SPI interface; no 1-Wire or ADx address pins; higher quiescent current (1.5 µA vs. 280 nA) | Requires dedicated SPI lines per device; unsuitable for large multdrop networks | Select when SPI host interface exists and K-type thermocouples dominate; avoid for distributed 1-Wire systems |
| ADS1118IDGST | General-purpose 16-bit delta-sigma ADC with internal temp sensor; no built-in cold-junction compensation or thermocouple-specific calibration | Requires external cold-junction sensor and software linearization; increases BOM and firmware complexity | Select when mixed-sensor designs (voltage, RTD, thermocouple) share same ADC; not drop-in for MAX31850TATB+ |
Compared with MAX31855KASA+, MAX31850TATB+ reduces system wiring and microcontroller GPIO usage via 1-Wire multdrop and location addressing; compared with ADS1118IDGST, it delivers out-of-box Type T accuracy without calibration overhead or external components.
Availability
MAX31850TATB+ is available at Aetrix Electronics and suitable for industrial process monitoring, HVAC system control, medical sterilization validation, and appliance safety monitoring requiring stable component supply and long-term lifecycle support.
Supply support for MAX31850TATB+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for demanding industrial, medical, and automotive applications.
The MAX31850 series targets distributed temperature sensing systems requiring minimal wiring, self-identifying nodes, and factory-calibrated thermocouple interfaces - emphasizing reliability, fault resilience, and ease of integration.
FAQ
What thermocouple types does the MAX31850TATB+ support?
The MAX31850TATB+ is factory trimmed and calibrated specifically for Type T thermocouples (copper/constantan), with nominal sensitivity of 52.18 µV/°C. It does not support other thermocouple types - variants like MAX31850K or MAX31851R are required for K-, R-, or S-type sensors. Using a non-Type T thermocouple with MAX31850TATB+ results in significant measurement error due to mismatched gain and offset.
How does the MAX31850TATB+ handle open or shorted thermocouple wires?
The MAX31850TATB+ includes dedicated hardware fault detection that automatically identifies open circuits, shorts to GND, and shorts to VDD on the T+ and T− inputs. These conditions are encoded in bits 0–2 of scratchpad byte 2: bit 0 = open, bit 1 = short-to-GND, bit 2 = short-to-VDD. This status is latched and readable without interrupting normal temperature conversions.
Can the MAX31850TATB+ operate without an external power supply?
Yes, the MAX31850TATB+ supports parasite power mode: it draws operating current from the 1-Wire bus via the DQ pin and stores charge on an internal capacitor (CPP). In this mode, VDD must be connected to GND. A strong pullup (e.g., MOSFET-switched rail) is required during temperature conversions (72–100 ms) to sustain >1 mA peak current - standard 4.7 kΩ pullups are insufficient.
What is the role of the AD0–AD3 pins on the MAX31850TATB+?
The AD0–AD3 pins on the MAX31850TATB+ are hardwired location address inputs (LSB to MSB) that configure a 4-bit node identifier (0–15). This value is stored in bits [3:0] of the configuration register (scratchpad byte 4) and enables deterministic addressing in multi-device 1-Wire networks - eliminating reliance on ROM search algorithms during initialization.
What is the temperature accuracy specification for the MAX31850TATB+ over its full range?
The MAX31850TATB+ achieves ±2°C thermocouple temperature accuracy over the full −270°C to +400°C range when ambient temperature is between −40°C and +125°C. This includes contributions from gain/offset error and cold-junction compensation error but excludes thermocouple wire nonlinearity - which must be corrected in host firmware using NIST ITS-90 tables.
MAX31850TATB+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 10-WFDFN Exposed Pad
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Thermocouple to Digital Converter
- Input Type:
- Thermocouple (Multiple)
- Output Type:
- Digital
- Current - Supply:
- 900 µA
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-TDFN (3x4)
MAX31850TATB+ FAQ
1.How can I place an order for MAX31850TATB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX31850TATB+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX31850TATB+ reliable?
The price and inventory of MAX31850TATB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX31850TATB+ is usually 5 days.
3.What payment methods are accepted for MAX31850TATB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX31850TATB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX31850TATB+?
MAX31850TATB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX31850TATB+ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX31850TATB+?
For technical support, including MAX31850TATB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX31850TATB+ requirements.
6.How does Aetrix verify that MAX31850TATB+ is sourced from the original manufacturer or authorized distributors?
All MAX31850TATB+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX31850TATB+ meets industry standards.
7.What is the process for return or replacement of MAX31850TATB+?
All MAX31850TATB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX31850TATB+, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX31850TATB+ part is unused and in its original packaging.
Return procedure for MAX31850TATB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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