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Texas Instruments LM95213CISDX
- Part No.:
- LM95213CISDX
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LM95213CISDX.pdf
- Description:
- SENSOR DIGITAL -40C-125C 14WSON
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM95213CISDX from Texas Instruments is an 11-bit dual remote + local digital temperature sensor with SMBus 2.0 interface, ±1.1°C remote diode accuracy (MMBT3904), 0.03125°C resolution with digital filter enabled, and three programmable open-drain TCRIT outputs for thermal shutdown or fan control in laptop/desktop CPU/GPU thermal management systems.
For engineers reviewing the LM95213CISDX datasheet, LM95213CISDX pinout, LM95213CISDX application, or LM95213CISDX equivalent, this page delivers verified technical context, validated pin functions, real-world thermal sensing use cases, and confirmed alternative parts for system-level thermal monitoring design.
Technical Context
The LM95213CISDX integrates a sigma-delta ADC core with programmable digital filters per remote channel to suppress noise-induced false TCRIT triggers while increasing remote resolution to 13-bit (0.03125°C). Its analog front end includes diode fault detection, offset correction registers for non-2N3904 diodes, and configurable current sources (160–230 µA) for D1+/D2+.
It implements three independent TCRIT outputs (TCRIT1/TCRIT2/TCRIT3) with shared hysteresis and per-channel masking via status and mask registers. The three-level A0 address pin enables up to three devices on one SMBus segment, and conversion rate is software-programmable from 1 Hz to one-shot mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Local Temp Accuracy | ±2.0°C max over −40°C to +125°C - ensures reliable die temperature tracking without self-heating compensation in typical PCB layouts |
| Remote Temp Accuracy | ±1.1°C max (MMBT3904, +25°C to +85°C) - enables precise CPU/GPU junction monitoring using standard discrete diodes |
| Resolution (Remote, Filter On) | 0.03125°C - supports fine-grained thermal throttling decisions when digital filtering is active |
| Supply Voltage | 3.0 V to 3.6 V - compatible with standard 3.3 V system rails and bypassed by 0.1 µF + 100 pF capacitors |
| Average Supply Current | 0.57 mA typ at 1 Hz - enables low-power thermal monitoring in battery-operated laptops and embedded systems |
| SMBus Compatibility | Fully compliant with SMBus 2.0, including TIMEOUT reset (25–35 ms low pulse) - ensures robust communication in noisy server/desktop environments |
| Operating Temperature | −40°C to +140°C - supports placement near high-temperature ICs such as VRMs and GPUs |
Pinout & Package
LM95213CISDX uses a 14-pin WSON package (NHL0014B) with 3.5 mm × 3.5 mm footprint and exposed thermal pad. Pin 1 is NC; pins 1–4 and 13–14 are no-connect or signal pins; D− (pin 5) serves as common cathode return for both remote diodes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 2) | Positive supply input | Must be decoupled with 0.1 µF + 100 pF capacitors; noise < 200 mVp-p; 10 µF may be needed for stability |
| D− (Pin 5) | Diode return current sink | Common cathode connection for both remote diodes; must be tied to GND or diode cathodes |
| D2+ (Pin 6) | Remote diode 2 anode current source | Connects to second remote IC's thermal diode anode; float if unused |
| D1+ (Pin 7) | Remote diode 1 anode current source | Connects to first remote IC's thermal diode anode; float if unused |
| GND (Pin 8) | Power ground | Low-noise system ground reference; critical for accurate remote diode measurement |
| A0 (Pin 9) | Address select input | Configures SMBus slave address (18h/2Ah/2Bh); tie to VDD/GND/mid-supply resistor divider |
| TCRIT1 (Pin 10) | Critical temp output 1 | Open-drain, active-low; triggers on unmasked local/remote exceedance of TCRIT1 limit |
| TCRIT2 (Pin 11) | Critical temp output 2 | Open-drain, active-low; shares limits with TCRIT3 but has independent mask control |
| SMBDAT (Pin 12) | SMBus bidirectional data | Open-drain; requires external pull-up; supports TIMEOUT reset and full SMBus 2.0 protocol |
| SMBCLK (Pin 13) | SMBus clock input | Input only; no clock stretching; 10–100 kHz operation; requires external pull-up |
| TCRIT3 (Pin 14) | Critical temp output 3 | Open-drain, active-low; shares TCRIT2 limits but uses separate mask register |
Key Features
| Feature | Design Value |
|---|---|
| Dual remote + local temperature sensing | Simultaneously monitors CPU/GPU die temps and local sensor ambient - eliminates need for multiple discrete sensors |
| Programmable digital filters (per remote channel) | Suppresses transient noise spikes without sacrificing resolution; enables reliable TCRIT triggering in electrically noisy compute platforms |
| Three independent TCRIT outputs with shared hysteresis | Allows differentiated thermal responses (e.g., TCRIT1 = immediate shutdown, TCRIT2 = fan ramp, TCRIT3 = MCU interrupt) using one device |
| Remote diode offset correction registers | Enables calibration for diodes other than MMBT3904 (e.g., integrated processor diodes), improving accuracy across heterogeneous thermal sources |
| Three-level SMBus address (A0) | Supports up to three LM95213CISDX units on a single bus - simplifies multi-zone thermal monitoring in servers and workstations |
Applications
| Laptop CPU Thermal Management | Desktop GPU Monitoring |
|---|---|
Use Scenario: Real-time die temperature tracking of Intel Core or AMD Ryzen CPUs during sustained load. IC Role / Device Role / Timing Role: LM95213CISDX reads CPU's internal thermal diode via D1+ and D−, reports local board ambient, and asserts TCRIT1 to throttle or shut down before thermal violation. Use Value: Achieves ±1.1°C accuracy at CPU junction, enabling tighter thermal margins and higher sustained boost clocks without derating. |
Use Scenario: Concurrent monitoring of NVIDIA RTX or AMD Radeon GPU die temperature and VRM hotspots. IC Role / Device Role / Timing Role: LM95213CISDX connects D1+ to GPU thermal diode and D2+ to VRM FET diode; TCRIT2 drives variable-speed fan controller. Use Value: Dual remote channels eliminate separate sensors, reducing BOM count and PCB area while maintaining independent alarm thresholds. |
| Server Processor Module | Industrial Embedded Controller |
Use Scenario: Multi-socket Xeon or EPYC server motherboard requiring per-CPU thermal supervision with SMBus scalability. IC Role / Device Role / Timing Role: Three LM95213CISDX units (A0-configured) share one SMBus master; each monitors one CPU socket's die and local zone. Use Value: A0 address flexibility allows daisy-chained thermal sensing without I²C multiplexers, lowering system cost and firmware complexity. |
Use Scenario: Fanless industrial PC operating in −40°C to +85°C ambient, needing reliable thermal protection without moving parts. IC Role / Device Role / Timing Role: LM95213CISDX measures local ambient (via on-chip sensor) and remote FPGA junction; TCRIT3 signals MCU for passive cooling action. Use Value: −40°C to +140°C operating range and 0.57 mA quiescent current ensure functionality in sealed enclosures with no airflow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual remote + local temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM95233CISDX | Higher remote accuracy (±0.75°C), 16-pin WQFN, adds remote diode model selection bits | Better suited for high-precision GPU/CPU monitoring where sub-1°C error is required | Select LM95233CISDX when tighter remote accuracy or advanced diode modeling (e.g., for FinFET processors) is mandatory |
| MAX6642AESA+ | Single remote + local, 8-pin SOIC, ±2°C remote accuracy, no digital filter, SMBus 1.1 only | Limited to one remote source; lacks noise-immune filtering and TCRIT hysteresis sharing | Choose MAX6642AESA+ only for cost-sensitive, single-zone designs where digital filtering and triple TCRIT outputs are unnecessary |
Compared with LM95233CISDX and MAX6642AESA+, the LM95213CISDX uniquely balances dual remote sensing, programmable digital filtering, and three independently maskable TCRIT outputs in a compact 14-pin WSON - making it optimal for mainstream laptop/desktop thermal architectures requiring robustness and flexibility without premium cost.
Availability
LM95213CISDX is available at Aetrix Electronics and suitable for laptop thermal management, desktop GPU monitoring, and server processor module applications requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for LM95213CISDX 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 and embedded processing technologies, with decades of expertise in precision sensing and power management ICs.
The LM95213CISDX belongs to TI's TruTherm™ family of digital temperature sensors, designed specifically for high-accuracy, multi-point thermal monitoring in computing and embedded systems where reliability and SMBus integration are critical.
FAQ
What is the remote temperature accuracy specification for LM95213CISDX?
The LM95213CISDX achieves ±1.1°C maximum remote diode temperature accuracy when used with an MMBT3904 diode-connected transistor over +25°C to +85°C ambient. This accuracy is guaranteed under specified conditions and applies to both remote channels. Accuracy degrades outside that range or with non-standard diodes unless calibrated using the device's offset correction registers. The LM95213CISDX datasheet specifies these limits in its Electrical Characteristics table.
Does LM95213CISDX support SMBus TIMEOUT reset functionality?
Yes, the LM95213CISDX fully supports SMBus TIMEOUT reset: holding SMBDAT and/or SMBCLK low for 25–35 ms resets the internal SMBus state machine and places SMBDAT/SMBCLK into high-impedance mode. This feature enables reliable bus recovery after communication errors and is explicitly documented in the LM95213CISDX datasheet's SMBus DIGITAL SWITCHING CHARACTERISTICS section.
How many remote diodes can LM95213CISDX monitor simultaneously?
The LM95213CISDX monitors two remote diodes simultaneously - one connected to D1+ and D−, the other to D2+ and D− - plus its own local temperature. Both remote channels support independent digital filtering, offset correction, and limit programming. Unused channels can be disabled via the Channel Enable Register to reduce average supply current and improve conversion speed.
What package type and dimensions does LM95213CISDX use?
The LM95213CISDX uses a 14-pin WSON package (TI package code NHL0014B) measuring 3.5 mm × 3.5 mm with an exposed thermal pad. It is RoHS-compliant and rated for −40°C to +140°C operation. The package drawing and thermal resistance values (e.g., 63°C/W with one thermal via) are provided in the official LM95213CISDX datasheet's mechanical and thermal sections.
Can LM95213CISDX be used with thermal diodes other than MMBT3904?
Yes, the LM95213CISDX supports thermal diodes beyond the MMBT3904 via its programmable remote diode offset correction registers. These registers allow calibration for non-ideal diodes found in modern processors or custom discrete implementations. The device also includes diode fault detection to identify open, shorted, or floating connections - ensuring robust operation across diverse thermal sources.
LM95213CISDX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Sensor Type:
- Digital, Local/Remote
- Sensing Temperature - Local:
- -40°C ~ 125°C
- Sensing Temperature - Remote:
- -40°C ~ 125°C
- Output Type:
- SMBus
- Voltage - Supply:
- 3V ~ 3.6V
- Resolution:
- 10 b
- Features:
- One-Shot, Output Switch, Programmable Limit, Shutdown Mode, Standby Mode
- Accuracy - Highest (Lowest):
- ±2°C
- Test Condition:
- -40°C ~ 125°C
- Operating Temperature:
- -40°C ~ 140°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 14-WSON (4x4)
LM95213CISDX FAQ
1.How can I place an order for LM95213CISDX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM95213CISDX 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 LM95213CISDX reliable?
The price and inventory of LM95213CISDX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM95213CISDX is usually 5 days.
3.What payment methods are accepted for LM95213CISDX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM95213CISDX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM95213CISDX?
LM95213CISDX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM95213CISDX 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 LM95213CISDX?
For technical support, including LM95213CISDX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM95213CISDX requirements.
6.How does Aetrix verify that LM95213CISDX is sourced from the original manufacturer or authorized distributors?
All LM95213CISDX 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 LM95213CISDX meets industry standards.
7.What is the process for return or replacement of LM95213CISDX?
All LM95213CISDX units undergo pre-shipment inspection (PSI). If there is an issue with LM95213CISDX, 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 LM95213CISDX part is unused and in its original packaging.
Return procedure for LM95213CISDX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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