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Texas Instruments LM95241CIMM-1/NOPB
- Part No.:
- LM95241CIMM-1/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM95241CIMM-1/NOPB.pdf
- Description:
- SENSOR DIGITAL 0C-85C 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,593
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Product details
Overview
LM95241CIMM-1/NOPB from Texas Instruments is a dual remote diode temperature sensor IC with SMBus 2.0 interface and TruTherm™ technology for precision thermal monitoring of 65nm/90nm Intel processors or discrete MMBT3904 diode-connected transistors. It measures local die temperature plus two remote junctions with ±1.25°C accuracy (TA=20–40°C, TD=45–85°C), 0.03125°C resolution with digital filtering, and operates from 3.0 V to 3.6 V supply.
For engineers reviewing the LM95241CIMM-1/NOPB datasheet, LM95241CIMM-1/NOPB pinout, LM95241CIMM-1/NOPB application, or LM95241CIMM-1/NOPB equivalent, this device delivers validated thermal sensing for high-density computing platforms where accurate multi-zone die temperature tracking-without external analog filtering-is required for fan control, thermal throttling, and system reliability management.
Technical Context
The LM95241CIMM-1/NOPB implements a sigma-delta ADC with ΔVBE sensing architecture to measure three thermal zones: its own die (local) and two external diode-connected transistor junctions. Its TruTherm™ circuitry compensates for non-ideality spread in 65nm/90nm Intel processor thermal diodes, enabling ±1.25°C accuracy without per-device calibration.
It features programmable digital filtering (11-bit/13-bit resolution), register-selectable diode model (Intel 65nm/90nm or MMBT3904), remote diode fault detection, and SMBus 2.0–compliant open-drain I/O with 100 kHz max clock frequency. Conversion time is 76.5–88.9 ms depending on TruTherm mode and filter state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Remote Temp Accuracy | ±1.25°C max (TA=20–40°C, TD=45–85°C) - ensures reliable thermal margin for laptop/desktop CPU throttling |
| Local Temp Accuracy | ±3.0°C max (TA=0–85°C) - sufficient for ambient board-temperature reference in thermal management loops |
| Resolution (w/ filtering) | 13-bit unsigned / 12-bit + sign, 0.03125°C LSB - resolves sub-degree changes critical for closed-loop fan control |
| Supply Voltage | 3.0 V to 3.6 V - compatible with standard 3.3 V rail; bypassing requires 0.1 µF + 100 pF near VDD pin |
| Average Supply Current | 471 µA typical at 1 Hz conversion - enables low-power thermal monitoring in always-on system states |
| SMBus Compatibility | SMBus 2.0 slave, 7-bit address 0x39 (CIMM-1), no clock stretching - integrates directly into existing platform controller hub (PCH) thermal buses |
| Package | 8-pin VSSOP (2.3 mm × 2.0 mm, 0.5 mm pitch) - surface-mount footprint optimized for space-constrained motherboard layouts |
Pinout & Package
LM95241CIMM-1/NOPB uses an 8-pin Very Small Outline Package (VSSOP) with exposed pad not electrically connected. The package supports reflow soldering per JEDEC J-STD-020 and has θJA = 210°C/W on 1 oz copper PCB with no airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D1+ | Diode current source | Drives bias current into anode of first remote thermal diode (e.g., Intel CPU die); no external capacitor required but 100 pF improves noise immunity |
| D1− | Diode return current sink | Completes bias path for D1+; connects to cathode of first remote diode; shares same noise sensitivity as D1+ |
| D2+ | Diode current source | Independent bias source for second remote diode (e.g., GPU or VRM FET junction); supports separate non-ideality selection |
| D2− | Diode return current sink | Return path for D2+; electrically isolated from D1− to prevent crosstalk between remote channels |
| GND | Power supply ground | Low-noise analog/digital reference; must connect to clean system ground plane to avoid measurement offset |
| VDD | Positive supply input | 3.0–3.6 V DC input; requires local 0.1 µF ceramic + 100 pF capacitor; noise must stay below 200 mVp-p |
| SMBDAT | SMBus bidirectional data line | Open-drain output; requires external pull-up resistor (≤82 kΩ @ 3.0 V); supports standard SMBus read/write protocols |
| SMBCLK | SMBus clock input | Asynchronous clock input from host controller; no internal pull-up; timing meets SMBus 2.0 tLOW/tHIGH specs |
Key Features
| Feature | Design Value |
|---|---|
| TruTherm™ technology | Reduces non-ideality spread across 65nm/90nm Intel processors, enabling ±1.25°C accuracy without per-CPU calibration |
| Dual independent remote channels | Simultaneous monitoring of CPU and GPU or VRM die temperatures using separate diode bias and model selection registers |
| Programmable digital filtering | Enables 13-bit resolution (0.03125°C LSB) for high-precision closed-loop thermal control, or 11-bit for faster updates |
| Remote diode fault detection | Flags open-circuit, short-to-rail, or floating conditions on D1+/D1− or D2+/D2− and reports −128.000°C or +255.875°C in signed/unsigned mode |
| SMBus 2.0 compliance with TIMEOUT | Resets internal state machine if SMBDAT/SMBCLK held low >25 ms - prevents bus lockup in noisy or faulty system environments |
Applications
| Laptop Thermal Management | Desktop Server Monitoring |
|---|---|
|
Use Scenario: Real-time CPU and GPU die temperature tracking in thin-and-light notebooks with limited airflow and aggressive thermal throttling policies. IC Role / Device Role / Timing Role: Dual-channel remote diode sensor providing synchronized local + two remote readings every 76–89 ms via SMBus for PCH-based thermal policy engine. Use Value: Enables precise fan speed ramping and dynamic voltage/frequency scaling (DVFS) using validated ±1.25°C remote accuracy-reducing acoustic noise while maintaining safe junction temperatures. |
Use Scenario: Multi-socket server motherboard with dual Xeon CPUs and discrete GPU, requiring independent thermal monitoring of each processor die and VRM hotspots. IC Role / Device Role / Timing Role: SMBus-slave temperature sensor interfacing with BMC/IPMI controller to feed real-time thermal data into platform-level health monitoring firmware. Use Value: Supports redundant thermal zone coverage (CPU1, CPU2, VRM) with fault detection-preventing thermal runaway during sustained compute loads in 24/7 operation. |
| Workstation Graphics Cooling | Industrial Embedded Control |
|
Use Scenario: High-end CAD/CAM workstation with air-cooled discrete GPU where localized hot spots require direct junction sensing beyond ambient PCB measurements. IC Role / Device Role / Timing Role: Remote diode sensor connected to GPU's integrated thermal diode and a discrete MMBT3904 on VRM MOSFET, delivering 13-bit filtered readings every 89 ms. Use Value: Achieves 0.03125°C resolution to detect subtle thermal drift before throttling occurs-extending GPU lifespan and sustaining peak render performance. |
Use Scenario: Fanless industrial PC used in factory automation, requiring passive thermal management with no moving parts and long-term reliability under wide ambient temperature swings. IC Role / Device Role / Timing Role: Local + dual remote sensor feeding thermal data to ARM-based SoC running Linux thermal daemon for predictive fanless throttling decisions. Use Value: ±3.0°C local accuracy and ±2.5°C extended-range remote accuracy (TD=25–140°C) ensure safe operation across −20°C to +70°C ambient without calibration drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual remote diode temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM95235CIMM/NOPB | Single remote channel, 10-bit resolution (0.25°C LSB), no TruTherm™ compensation, SMBus address 0x4C | Limited to one CPU or GPU zone; lacks 65nm/90nm processor optimization and dual-diode fault reporting | Select when only one thermal zone requires monitoring and cost reduction is prioritized over multi-processor accuracy. |
| MAX6642AESA+ | Single remote + local, 11-bit resolution, SMBus 1.1, no digital filtering, ±2°C remote accuracy (TD=25–125°C) | No support for Intel 65nm/90nm non-ideality correction; lower resolution limits fine-grained thermal loop control | Choose for legacy SMBus 1.1 systems where TruTherm™ and dual-channel capability are unnecessary. |
Compared with LM95241CIMM-1/NOPB, LM95235CIMM/NOPB reduces channel count and removes TruTherm™, while MAX6642AESA+ offers simpler SMBus 1.1 compatibility but sacrifices resolution, filtering, and modern process node support-making LM95241CIMM-1/NOPB the only option meeting full dual-zone, 65nm/90nm-optimized, SMBus 2.0 requirements.
Availability
LM95241CIMM-1/NOPB is available at Aetrix Electronics and suitable for laptop thermal management, desktop server monitoring, and industrial embedded control requiring stable component supply and guaranteed long-term availability.
Supply support for LM95241CIMM-1/NOPB 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 company headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with over 90 years of innovation in precision sensing and power management ICs.
LM95241CIMM-1/NOPB belongs to TI's TruTherm™ temperature sensor product line, designed specifically for high-accuracy thermal monitoring of advanced-node microprocessors and discrete power semiconductors in computing and industrial platforms.
FAQ
What is the SMBus address of the LM95241CIMM-1/NOPB?
The LM95241CIMM-1/NOPB has a fixed 7-bit SMBus slave address of 0x39 (binary 00111001), determined by internal hardwiring of address pins A6–A0. This differs from the base LM95241CIMM (0x2B) and LM95241CIMM-2 (0x2A), ensuring conflict-free bus operation when multiple variants coexist on the same SMBus segment. The LM95241CIMM-1/NOPB does not support address modification via hardware pins or software configuration.
How does TruTherm™ technology improve accuracy for Intel 65nm/90nm processors?
TruTherm™ technology in the LM95241CIMM-1/NOPB actively compensates for process-induced non-ideality variations in Intel 65nm/90nm thermal diodes, reducing inter-die measurement spread. When enabled via the Remote Diode TruTherm Mode Control register, it achieves ±1.25°C accuracy (TA=20–40°C, TD=45–85°C)-a 1.25°C improvement over non-TruTherm modes-by dynamically adjusting the ΔVBE conversion algorithm based on known non-ideality coefficients for those specific process nodes.
Can the LM95241CIMM-1/NOPB monitor both Intel CPU and discrete MMBT3904 diodes simultaneously?
Yes, the LM95241CIMM-1/NOPB supports simultaneous monitoring of two independent thermal diodes with different models: D1+ and D1− can be configured for Intel 65nm/90nm processor thermal diodes (TruTherm™ enabled), while D2+ and D2− can be set for MMBT3904 discrete transistors (TruTherm™ disabled). This is controlled via separate Remote Diode Model Select bits in the configuration register, allowing mixed-source thermal monitoring without hardware change.
What is the maximum measurable remote temperature with digital filtering enabled?
With digital filtering enabled, the LM95241CIMM-1/NOPB supports 13-bit unsigned resolution, allowing remote temperature measurements up to +255.875°C (0.03125°C LSB). This range exceeds typical silicon junction limits and accommodates high-temperature VRM or power stage monitoring where thermal diodes may operate above 127°C-unlike the 11-bit mode, which caps at +127.875°C in unsigned format.
Does the LM95241CIMM-1/NOPB require external filter capacitors on the diode inputs?
No, the LM95241CIMM-1/NOPB incorporates internal analog filtering in its thermal diode input stage, eliminating the need for mandatory external capacitors on D1+/D1− or D2+/D2−. A 100 pF capacitor is optional and recommended only in electrically noisy environments to further suppress EMI-induced measurement errors-TI's datasheet explicitly states "a capacitor is not required" for basic operation.
LM95241CIMM-1/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- TruTherm™
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Sensor Type:
- Digital, Local/Remote
- Sensing Temperature - Local:
- 0°C ~ 85°C
- Sensing Temperature - Remote:
- 0°C ~ 85°C
- Output Type:
- SMBus
- Voltage - Supply:
- 3V ~ 3.6V
- Resolution:
- 10 b (Local), 12 b (Remote)
- Features:
- One-Shot, Programmable Resolution, Shutdown Mode, Standby Mode
- Accuracy - Highest (Lowest):
- ±3°C
- Test Condition:
- 0°C ~ 85°C
- Operating Temperature:
- 0°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-VSSOP
LM95241CIMM-1/NOPB FAQ
1.How can I place an order for LM95241CIMM-1/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM95241CIMM-1/NOPB 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 LM95241CIMM-1/NOPB reliable?
The price and inventory of LM95241CIMM-1/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM95241CIMM-1/NOPB is usually 5 days.
3.What payment methods are accepted for LM95241CIMM-1/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM95241CIMM-1/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM95241CIMM-1/NOPB?
LM95241CIMM-1/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM95241CIMM-1/NOPB 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 LM95241CIMM-1/NOPB?
For technical support, including LM95241CIMM-1/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM95241CIMM-1/NOPB requirements.
6.How does Aetrix verify that LM95241CIMM-1/NOPB is sourced from the original manufacturer or authorized distributors?
All LM95241CIMM-1/NOPB 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 LM95241CIMM-1/NOPB meets industry standards.
7.What is the process for return or replacement of LM95241CIMM-1/NOPB?
All LM95241CIMM-1/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM95241CIMM-1/NOPB, 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 LM95241CIMM-1/NOPB part is unused and in its original packaging.
Return procedure for LM95241CIMM-1/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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