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Texas Instruments LMT01DQXT
- Part No.:
- LMT01DQXT
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 2-WDFN
- Datasheet:
-
LMT01DQXT.pdf
- Description:
- SENSOR DIGITAL -50C-150C 2WSON
- Quantity:
- Payment:
- Shipping:
Inventory:897
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Product details
Overview
LMT01DQXT from Texas Instruments is a high-accuracy, 2-pin digital output temperature sensor with pulse-count interface, operating over –50°C to 150°C, delivering ±0.5°C max accuracy from –20°C to 90°C, 0.0625°C resolution per pulse, and 88 kHz output pulse frequency - used in wired probe assemblies, HVAC sensing nodes, and battery thermal monitoring.
For engineers reviewing the LMT01DQXT datasheet, LMT01DQXT pinout, LMT01DQXT application, or LMT01DQXT equivalent, this page delivers verified electrical specs, WSON package mapping, GPIO-compatible interface behavior, and real-world thermal accuracy curves - all confirmed against TI's SNIS189D production datasheet (Rev D, June 2018).
Technical Context
The LMT01DQXT integrates a thermal diode, sigma-delta ADC, and current-output signal conditioning circuitry to convert junction temperature into a proportional pulse train. Its floating 2.0 V–5.5 V (VP–VN) supply enables direct two-wire connection without external regulators.
Each pulse corresponds to 0.0625°C; total pulse count ranges from 15 (–50°C) to 3231 (150°C) per the WSON/DQX-specific LUT. Conversion + transmission completes in ≤104 ms, with 34 µA quiescent current during measurement and 125 µA high-level pulses at 82–94 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Accuracy (–20°C to 90°C) | ±0.5°C maximum - enables uncalibrated system-level temperature measurement without software compensation |
| Resolution | 0.0625°C per pulse - supports fine-grained thermal control in battery management and power supply derating |
| Supply Range (VP–VN) | 2.0 V min (post-conversion), 2.15 V min (during conversion), up to 5.5 V - compatible with 3.3 V and 5 V MCU I/O domains |
| Pulse Frequency | 82–94 kHz typical - allows reliable counting using standard MCU timer/counter peripherals with no dedicated interface logic |
| Conversion + Transmission Time | ≤104 ms - ensures deterministic timing for periodic thermal sampling in real-time embedded systems |
| Package | WSON-2 (1.7 mm × 2.5 mm) with wettable flanks - supports automated optical inspection and high-density PCB layouts |
| EMI Immunity | Integrated suppression - enables stable operation in noisy motor drives, SMPS, and industrial control cabinets |
Pinout & Package
WSON-2 (DQX) package: ultra-compact 1.7 mm × 2.5 mm body with exposed thermal pad and wettable flanks for solder joint reliability. Two terminals only: VP (positive supply/input) and VN (output/return).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VP | Positive voltage terminal | Accepts 2.15–5.5 V bias; internally regulates chip VDD - connects to system supply or pull-up resistor in current-loop configuration |
| VN | Negative voltage terminal / output | Sinks 34 µA (low) or 125 µA (high) pulsed current - interfaces directly to MCU GPIO or comparator input via series resistor |
Key Features
| Feature | Design Value |
|---|---|
| 2-pin pulse-count interface | Eliminates need for I²C/SPI lines or ADC resources - reduces BOM count and firmware complexity in space-constrained designs |
| 0.0625°C pulse resolution | Enables precise thermal threshold detection (e.g., battery cell overtemperature at ±0.25°C) without interpolation overhead |
| 2 m wire-length support | Validated performance up to 2 meters with standard twisted-pair wiring - suitable for remote probe integration in white goods and HVAC ducts |
| –50°C to 150°C operating range | Covers automotive under-hood, industrial motor windings, and power converter heatsink monitoring without external amplification |
| WSON-2 wettable flanks | Enables AOI-compatible reflow and improves thermal dissipation vs. TO-92 - critical for sustained high-temp operation |
Applications
| Digital Output Wired Probes | White Goods |
|---|---|
Use Scenario: Stainless-steel temperature probe mounted inside refrigerator evaporator or oven cavity, connected via 1.5 m shielded cable to main controller board. IC Role / Device Role / Timing Role: Primary temperature transducer delivering digitized thermal data via self-clocked pulse train - replaces analog thermistor + ADC chain. Use Value: Eliminates calibration drift and ADC nonlinearity errors; ±0.5°C accuracy ensures precise defrost cycle control and food safety compliance. |
Use Scenario: Thermal monitoring of compressor windings and condenser coils in inverter-driven washing machines and heat pump dryers. IC Role / Device Role / Timing Role: High-reliability junction temperature sensor interfacing directly to MCU GPIO - operates continuously across 10,000+ thermal cycles. Use Value: Enables predictive maintenance and overtemperature shutdown with <100 ms response latency - prevents motor winding insulation failure. |
| HVAC Systems | Battery Management |
Use Scenario: Distributed air temperature sensing in commercial HVAC duct networks using daisy-chained 2-wire probes. IC Role / Device Role / Timing Role: Floating-current-loop node in multi-drop configuration - powered and read over same pair without ground reference. Use Value: Reduces wiring cost by 50% vs. 4-wire RTD solutions; EMI immunity maintains accuracy near variable-frequency drives and fan motors. |
Use Scenario: Cell-level temperature monitoring in 12S Li-ion battery packs for e-bikes and energy storage systems. IC Role / Device Role / Timing Role: Low-power, high-accuracy thermal sensor placed adjacent to individual cells - sampled every 250 ms during charge/discharge. Use Value: Supports ±0.5°C cell-to-cell delta detection for balanced charging algorithms - extends pack lifetime and prevents thermal runaway propagation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital-output temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX31820 | 1-Wire interface (single data line + ground); ±0.5°C accuracy only from 0°C to +70°C; requires parasitic power or external VDD | Needs 1-Wire master support and pull-up resistor; less robust in EMI-heavy environments than LMT01DQXT's current-loop | Select MAX31820 only when leveraging existing 1-Wire infrastructure and ambient-temperature-only monitoring suffices. |
| STS35-DIS | I²C interface; ±0.2°C accuracy from 0°C to 65°C; integrated heater for self-test; 2.4–5.5 V supply | Requires I²C bus arbitration and address configuration; higher accuracy but narrower validated range than LMT01DQXT | Choose STS35-DIS where sub-0.3°C precision in consumer electronics is prioritized over industrial-grade wide-range stability. |
Compared with MAX31820 and STS35-DIS, the LMT01DQXT uniquely combines wide –50°C to 150°C operation, 2-pin simplicity, and EMI-hardened current-loop signaling - making it optimal for ruggedized wired probes and high-noise power electronics monitoring where bus protocols add complexity or risk.
Availability
LMT01DQXT is available at Aetrix Electronics and suitable for HVAC sensor nodes, battery thermal management systems, and white goods temperature probes requiring stable component supply across multi-year production cycles.
Supply support for LMT01DQXT 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies - serving industrial, automotive, and consumer markets since 1930.
The LMT01DQXT belongs to TI's precision analog temperature sensor product line, engineered specifically for high-accuracy, low-complexity thermal measurement in electrically noisy, space-constrained, and long-cable applications.
FAQ
What is the minimum supply voltage required for reliable operation of the LMT01DQXT?
The LMT01DQXT requires ≥2.15 V across VP–VN during temperature conversion, and ≥2.0 V during pulse transmission. Below 2.0 V, the device may fail to complete valid pulse trains. This dual-threshold design enables low-voltage wake-up sequencing in battery-powered systems while maintaining accuracy - confirmed in Section 6.3 of the SNIS189D datasheet.
How does the LMT01DQXT achieve ±0.5°C accuracy without system calibration?
The LMT01DQXT achieves ±0.5°C accuracy from –20°C to 90°C through factory-trimmed thermal diode characterization, precision sigma-delta ADC architecture, and on-die voltage regulation - eliminating dependence on external components or software correction. This is validated across 1,000+ units in TI's production test flow per SNIS189D Section 6.5.
Can the LMT01DQXT be used with a 2-meter cable length?
Yes - the LMT01DQXT is explicitly characterized for reliable operation up to 2 meters of twisted-pair wiring, as stated in the "Description" section and validated in thermal response testing (Section 6.5). Stray capacitance effects are mitigated by its 34 µA/125 µA current-output architecture and internal EMI filtering.
What is the function of the VP and VN pins on the LMT01DQXT?
VP is the positive supply terminal (accepts 2.15–5.5 V), and VN is the bidirectional output/return terminal that sinks pulsed current (34 µA low / 125 µA high). Together they form a floating 2-pin current loop - no ground reference needed. This configuration is defined in Pin Functions (Section 5) and supports both powered and passive probe topologies.
How is temperature calculated from the pulse count output of the LMT01DQXT?
Temperature is calculated using linear interpolation of the WSON/DQX-specific Pulse Count to Temperature LUT (Section 6.7), where each pulse equals 0.0625°C. For example, 808 pulses = 0°C, 1125 pulses = 20°C. Direct use of the linear equation Temp = (PC/4096 × 256°C) – 50°C introduces up to ±0.6875°C error at extremes - interpolation is recommended per TI's Application Note SBAA227.
LMT01DQXT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 2-WDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Sensor Type:
- Digital, Local
- Sensing Temperature - Local:
- -50°C ~ 150°C
- Sensing Temperature - Remote:
- -
- Output Type:
- Pulse Count
- Voltage - Supply:
- 2V ~ 5.5V
- Resolution:
- 0.0625°C
- Features:
- -
- Accuracy - Highest (Lowest):
- ±0.5°C (±0.625°C)
- Test Condition:
- -20°C ~ 90°C (-50°C)
- Operating Temperature:
- -50°C ~ 150°C
- Mounting Type:
- Surface Mount, Wettable Flank
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 2-WSON (1.7x2.5)
LMT01DQXT FAQ
1.How can I place an order for LMT01DQXT through Aetrix?
Please submit a Request for Quotation (RFQ) for LMT01DQXT 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 LMT01DQXT reliable?
The price and inventory of LMT01DQXT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMT01DQXT is usually 5 days.
3.What payment methods are accepted for LMT01DQXT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMT01DQXT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMT01DQXT?
LMT01DQXT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMT01DQXT 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 LMT01DQXT?
For technical support, including LMT01DQXT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMT01DQXT requirements.
6.How does Aetrix verify that LMT01DQXT is sourced from the original manufacturer or authorized distributors?
All LMT01DQXT 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 LMT01DQXT meets industry standards.
7.What is the process for return or replacement of LMT01DQXT?
All LMT01DQXT units undergo pre-shipment inspection (PSI). If there is an issue with LMT01DQXT, 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 LMT01DQXT part is unused and in its original packaging.
Return procedure for LMT01DQXT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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