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Analog Devices Inc./Maxim Integrated MAX31889ALT+T
- Part No.:
- MAX31889ALT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog and Digital Output
- Package:
- 6-WDFN
- Datasheet:
-
MAX31889ALT+T.pdf
- Description:
- SENSOR DGTL -40C - 125C 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,022
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Product details
Overview
The MAX31889ALT+T from Analog Devices is a high-accuracy, low-power I²C digital temperature sensor with ±0.25°C error from –20°C to +105°C, 16-bit resolution (0.005°C), and integrated 32-word FIFO for buffered temperature logging - used in precision IoT sensor nodes, industrial monitoring systems, and RTD-replacement applications requiring NIST-traceable calibration.
For engineers reviewing the MAX31889ALT+T datasheet, MAX31889ALT+T pinout, MAX31889ALT+T application, or MAX31889ALT+T equivalent, this page delivers verified electrical specs, GPIO configuration logic, I²C timing compliance (400kHz), thermal alarm thresholds, and real-world design implications of its μDFN-6 package and dual programmable GPIOs.
Technical Context
The MAX31889ALT+T implements a fully integrated sigma-delta temperature sensing core with on-chip ADC, digital calibration, and register-mapped control logic. Its I²C interface supports standard-mode (100kHz) and fast-mode (400kHz) operation with open-drain SDA/SCL, configurable slave addresses (0xA0–0xA7), and auto-incrementing register access for burst FIFO reads.
Two GPIO pins are functionally decoupled: GPIO1 serves as an external active-low conversion trigger or HiZ input; GPIO0 operates as interrupt output (INTB) or HiZ input, with status bits (TEMP_HI/TEMP_LO) configurable via INTERRUPT_ENABLE[0x01] and GPIO_SETUP[0x20]. Alarm thresholds (AH/AL) are stored in volatile 16-bit two's complement registers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Accuracy | ±0.25°C over –20°C to +105°C; enables direct replacement of Class A RTDs in industrial control loops without linearization firmware. |
| Resolution | 16-bit (0.005°C LSB); supports sub-millidegree repeatability (0.008°C rms) for trending microthermal shifts in battery-powered edge sensors. |
| Supply Range | 1.7V to 3.6V; compatible with single-cell Li-ion, coin-cell, and 3.3V rail systems without LDO overhead. |
| Operating Current | 68µA during conversion (17.85ms), 0.55µA standby; extends 10-year battery life in wireless sensor networks. |
| I²C Interface | 400kHz max clock, 4 selectable addresses, SMBus-compatible; eliminates bus contention in multi-sensor nodes with shared SDA/SCL lines. |
| FIFO Depth | 32 × 16-bit temperature words; allows autonomous logging during host sleep cycles-critical for duty-cycled IoT endpoints. |
| Package | 2mm × 2mm × 0.8mm μDFN-6; enables placement in space-constrained modules (e.g., wearables, smart thermostats) with 182.96°C/W θJA. |
Pinout & Package
Package: 2mm × 2mm × 0.8mm, 6-pin μDFN (package code L622+2), RoHS-compliant, wettable flank capable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GPIO0 | Configurable interrupt output or HiZ input | Asserts hardware interrupt on TEMP_HI/TEMP_LO status when GPIO0_MODE = 0x3; default 1MΩ pulldown enables I²C address selection at power-up. |
| 2 - SCL | I²C clock input | Open-drain compatible; requires external pullup; supports 400kHz timing with tLOW ≥1.3µs and tHIGH ≥0.6µs. |
| 3 - SDA | I²C bidirectional data line | Open-drain output with VOL ≤0.4V @ 6mA sink; requires external pullup; handles ACK/NACK handshaking per I²C spec. |
| 4 - GPIO1 | External conversion trigger or HiZ input | Pulled low to initiate temperature measurement; default 1MΩ pulldown sets I²C address LSBs; no internal pullup. |
| 5 - GND | Analog/digital ground reference | Single ground plane required; decoupling capacitor (100nF) must be placed between VDD and GND per layout guidelines. |
| 6 - VDD | Power supply input | 1.7V–3.6V operation; PSRR = 0.006°C/V ensures stable readings across supply ripple common in switched regulators. |
Key Features
| Feature | Design Value |
|---|---|
| NIST-traceable unique ROM ID | Each unit ships with factory-programmed 64-bit serial number enabling calibration traceability and device-level firmware binding. |
| Programmable temperature alarms | Independent 16-bit high/low thresholds (AH/AL registers) with status flagging-enables autonomous overtemp shutdown without MCU polling. |
| Dual configurable GPIOs | GPIO0 and GPIO1 support four functional modes (HiZ input, push-pull output, INTB, CONV) controlled by GPIO_SETUP[0x20], eliminating external logic. |
| 32-word FIFO with pointer control | FIFO_WR_PTR/FIFO_RD_PTR registers allow deterministic read/write management; FLUSH_FIFO bit clears buffer in one write-critical for fault recovery. |
| Low-voltage I²C compatibility | VIL = 0.4V / VIH = 1.4V thresholds ensure robust communication down to 1.7V VDD, avoiding level-shifter requirements in ultra-low-power designs. |
Applications
| Industrial Process Monitoring | Smart Building HVAC Sensors |
|---|---|
|
Use Scenario: Continuous ambient and equipment surface temperature logging in PLC cabinets and motor control enclosures. IC Role / Device Role / Timing Role: Primary temperature acquisition node with FIFO buffering, enabling 30-second sampling intervals while host MCU sleeps. Use Value: ±0.25°C accuracy eliminates field recalibration; 0.55µA standby current reduces thermal self-heating error to <0.01°C in sealed enclosures. |
Use Scenario: Distributed room-level temperature sensing in BACnet/IP or KNX-enabled thermostats and occupancy modules. IC Role / Device Role / Timing Role: I²C slave sensor with GPIO0 interrupt signaling temperature excursions beyond setpoints to local microcontroller. Use Value: Configurable alarm thresholds (AH/AL) replace discrete comparator circuits; 2mm × 2mm footprint fits behind 30mm-diameter sensor bezels. |
| IoT Edge Node Temperature Logging | Medical Device Thermal Safety |
|
Use Scenario: Battery-powered environmental monitors transmitting hourly temperature snapshots via LoRaWAN or NB-IoT. IC Role / Device Role / Timing Role: Autonomous data logger using FIFO to store 32 samples (≈17 hours at 30-min intervals) before host wake-up and upload. Use Value: 68µA conversion current and 17.85ms measurement time minimize energy per reading; ROM ID enables secure firmware OTA validation. |
Use Scenario: Patient-contact thermistor replacement in portable diagnostic devices requiring clinical-grade accuracy and traceability. IC Role / Device Role / Timing Role: Primary calibrated temperature source with NIST-traceable ROM ID and ±0.65°C extended range (–40°C to +125°C). Use Value: Eliminates analog signal chain errors (amplifier offset, ADC INL); 16-bit resolution supports FDA-required 0.1°C display granularity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital temperature sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX31856AUG+T | Higher accuracy (±0.25°C over –40°C to +125°C), SPI interface, cold-junction compensation for thermocouples - no I²C or FIFO. | Designed for thermocouple-based industrial measurement; lacks GPIO flexibility and I²C address configurability of MAX31889ALT+T. | Select when interfacing K/J-type thermocouples; avoid if I²C bus sharing or interrupt-driven operation is required. |
| STTS751DTYQTR | ±0.5°C accuracy over –40°C to +125°C, 12-bit resolution, 1.7V–3.6V supply, I²C interface - no GPIOs or FIFO. | Cost-optimized sensor for non-critical consumer applications; missing programmable alarms, ROM ID, and conversion-trigger GPIO. | Choose for basic temperature monitoring where sub-0.25°C accuracy and autonomous logging are unnecessary. |
Compared with MAX31856AUG+T and STTS751DTYQTR, the MAX31889ALT+T uniquely combines I²C address configurability, dual GPIOs with interrupt/trigger roles, 32-word FIFO, and NIST-traceable ROM ID - making it optimal for space-constrained, battery-operated, and calibration-critical embedded systems.
Availability
The MAX31889ALT+T is available at Aetrix Electronics and suitable for industrial process monitoring, smart building HVAC systems, and IoT edge node temperature logging requiring stable component supply, long-lifecycle availability, and full RoHS compliance.
Supply support for MAX31889ALT+T 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
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The MAX31889ALT+T belongs to Analog Devices' precision temperature sensor product line, engineered for applications demanding metrology-grade accuracy, ultra-low power, and seamless integration into resource-constrained embedded systems.
FAQ
What is the operating temperature range and accuracy specification of the MAX31889ALT+T?
The MAX31889ALT+T guarantees ±0.25°C accuracy from –20°C to +105°C and ±0.65°C accuracy from –40°C to +125°C. Its operating temperature range is –40°C to +125°C, with junction temperature limited to +150°C. These specifications are validated across the full supply range (1.7V–3.6V) and include 3-sigma statistical confidence per the datasheet.
How does the MAX31889ALT+T configure its I²C slave address?
The MAX31889ALT+T determines its 7-bit I²C address dynamically based on the power-up state and GPIO_MODE settings of GPIO0 and GPIO1. With default 1MΩ internal pulldowns, both pins read low, yielding address 0xA0 (write) / 0xA1 (read). Driving either pin high or configuring GPIO_MODE bits changes the address to 0xA2–0xA7. The GPIO_SETUP register (0x20) controls mode selection.
Can the MAX31889ALT+T operate autonomously without continuous MCU intervention?
Yes - the MAX31889ALT+T supports autonomous operation via its 32-word FIFO, programmable temperature alarms, and GPIO1 external conversion trigger. Once configured, it can log temperature data continuously and assert GPIO0 interrupt on threshold violation, allowing the host MCU to remain in deep sleep until an event occurs.
What is the purpose and behavior of the FIFO in the MAX31889ALT+T?
The MAX31889ALT+T features a 32-entry × 16-bit FIFO that stores temperature measurements sequentially. It supports burst reads starting at register 0x08, with independent read/write pointers (0x04/0x05) and overflow tracking (0x06). The FLUSH_FIFO bit (0x0A) clears all entries in one write - essential for deterministic restart after fault conditions.
Does the MAX31889ALT+T support NIST traceability, and how is it implemented?
Yes - each MAX31889ALT+T unit includes a factory-programmed, unique 64-bit ROM ID stored in read-only memory. This ID enables device-level calibration traceability to NIST standards when paired with certified test equipment and documented calibration procedures, fulfilling requirements for medical and industrial certification.
MAX31889ALT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Sensor Type:
- Digital, Local
- Sensing Temperature - Local:
- -40°C ~ 125°C
- Sensing Temperature - Remote:
- -
- Output Type:
- I2C
- Voltage - Supply:
- 1.7V ~ 3.6V
- Resolution:
- 16 b
- Features:
- -
- Accuracy - Highest (Lowest):
- ±0.45°C (±0.9°C)
- Test Condition:
- -20°C ~ 105°C (-40°C ~ 125°C)
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 6-µDFN (2x2)
MAX31889ALT+T FAQ
1.How can I place an order for MAX31889ALT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX31889ALT+T 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 MAX31889ALT+T reliable?
The price and inventory of MAX31889ALT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX31889ALT+T is usually 5 days.
3.What payment methods are accepted for MAX31889ALT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX31889ALT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX31889ALT+T?
MAX31889ALT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX31889ALT+T 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 MAX31889ALT+T?
For technical support, including MAX31889ALT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX31889ALT+T requirements.
6.How does Aetrix verify that MAX31889ALT+T is sourced from the original manufacturer or authorized distributors?
All MAX31889ALT+T 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 MAX31889ALT+T meets industry standards.
7.What is the process for return or replacement of MAX31889ALT+T?
All MAX31889ALT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX31889ALT+T, 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 MAX31889ALT+T part is unused and in its original packaging.
Return procedure for MAX31889ALT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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