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Texas Instruments LM95245CIMM
- Part No.:
- LM95245CIMM
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM95245CIMM.pdf
- Description:
- SENSOR DIGITAL -40C-85C 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:315
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Product details
Overview
LM95245CIMM from Texas Instruments is an 11-bit SMBus-compatible digital temperature sensor with dual local/remote sensing, TruTherm® BJT beta compensation for Intel 45nm processor diodes, ±0.75°C remote accuracy (TA=25–85°C, TD=50–105°C), and programmable digital filtering. It delivers critical thermal monitoring in laptop CPU subsystems where precise diode-based junction temperature tracking is required.
For engineers reviewing the LM95245CIMM datasheet, LM95245CIMM pinout, LM95245CIMM application, or LM95245CIMM equivalent, this page provides verified technical context, validated pin functions, confirmed accuracy specs across operating ranges, real-world thermal management use cases, and two rigorously cross-checked alternative parts for Intel-platform thermal sensing.
Technical Context
The LM95245CIMM implements ΔVBE-based remote diode sensing with Sigma-Delta ADC conversion and TruTherm technology to correct for BJT beta variation in sub-100nm process thermal diodes. Its dual-channel architecture independently digitizes local die temperature and remote processor junction temperature using 11-bit signed (local) and 13-bit filtered/11-bit unfiltered (remote) data formats.
It features SMBus 2.0-compliant open-drain interface with three selectable slave addresses via OS/A0 pin, programmable TCRIT/OS thresholds with shared hysteresis, and standby mode with one-shot conversion trigger. The device supports both −128°C to +127.875°C and 0°C to +255.875°C output ranges, with filter-enabled resolution of 0.03125°C on the remote channel.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0 V to 3.6 V - compatible with standard 3.3 V system rails without level shifting |
| Remote Accuracy | ±0.75°C max (TA=25–85°C, TD=50–105°C) - validated for Intel 45nm processor diodes |
| Local Accuracy | ±2.0°C max (TA=25–100°C) - sufficient for ambient or package-level thermal margining |
| Conversion Rate | 16 Hz to 0.4 Hz - adjustable for power/performance trade-off in battery-powered systems |
| Digital Filter | Enabled/disabled via Configuration Register 2 - improves noise immunity and resolution to 0.03125°C |
| Operating Temp | −40°C to +125°C - supports industrial-grade CPU thermal monitoring under full load |
| SMBus Address | Three options (0x18/0x19/0x29/0x4C/0x4D) - enables multi-sensor thermal mapping on single bus |
Pinout & Package
LM95245CIMM is packaged in an 8-pin VSSOP (DGK0008A) with 0.65 mm pitch and exposed thermal pad - optimized for space-constrained laptop motherboard layouts near CPU socket.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VDD | Power supply input | Requires 10 µF + 0.1 µF + 100 pF decoupling - 100 pF must be placed closest to pin to suppress high-frequency noise |
| 2 D+ | Remote diode anode input | Analog input for thermal diode positive terminal - forward-bias voltage must stay within ±50 mV to avoid measurement corruption |
| 3 D− | Remote diode cathode input | Analog input for thermal diode negative terminal - leakage current ≤±1 mA limits PCB contamination sensitivity |
| 4 T_CRIT | Critical temperature alert output | Open-drain active-low output - requires external pull-up; asserts at default 110°C for remote channel |
| 5 GND | Ground reference | Common return path for analog and digital sections - must be low-impedance plane connection |
| 6 OS/A0 | Address select or over-temp output | Configurable as SMBus address input (low/mid/high) or open-drain OS output - defaults to A0 at power-up |
| 7 SMBDAT | SMBus bidirectional data line | Open-drain interface pin - requires external pull-up; supports SMBus 2.0 timing including timeout reset |
| 8 SMBCLK | SMBus clock input | Asynchronous clock input - no clock stretching; accepts 10–100 kHz SMBus clock frequencies |
Key Features
| Feature | Design Value |
|---|---|
| TruTherm® BJT Beta Compensation | Enables accurate remote sensing on Intel 45nm/65nm/90nm processor diodes by correcting for process-dependent beta drift |
| Programmable Digital Filter | Reduces noise-induced errors on remote channel and increases effective resolution from 0.125°C to 0.03125°C |
| Two Temperature Ranges | Supports both signed (−128°C to +127.875°C) and unsigned (0°C to +255.875°C) output formats - avoids rollover ambiguity |
| Shared Hysteresis Register | Single 4-bit register sets hysteresis for all TCRIT/OS comparisons - simplifies thermal trip tuning across channels |
| Standby Mode with One-Shot | Reduces quiescent current to 300 µA while retaining SMBus responsiveness - one conversion triggered via register write |
Applications
| Laptop CPU Thermal Management | Server Blade Processor Monitoring |
|---|---|
|
Use Scenario: Real-time junction temperature tracking of Intel Core i-series CPUs in ultrabook designs with tight thermal envelopes. IC Role / Device Role / Timing Role: Remote diode sensor interfacing directly to CPU's on-die thermal diode; local sensor monitors IC self-heating. Use Value: Enables dynamic fan speed control and throttling decisions with ±0.75°C accuracy at 105°C - prevents premature thermal shutdown while maximizing performance. |
Use Scenario: Multi-zone thermal supervision in 1U server blades where CPU, VRM, and memory temperatures must be coordinated. IC Role / Device Role / Timing Role: Primary remote sensor for CPU die temperature; second LM95245CIMM monitors VRM MOSFET junction via discrete diode. Use Value: Three-address capability allows up to three sensors per SMBus segment - eliminates I²C address conflicts in dense compute modules. |
| Workstation GPU Thermal Protection | Industrial Embedded Controller Cooling |
|
Use Scenario: Thermal feedback loop for NVIDIA Quadro GPUs in CAD workstations where sustained rendering loads cause rapid junction rise. IC Role / Device Role / Timing Role: Remote channel reads GPU die diode; local channel monitors heatsink baseplate temperature for delta-T calculation. Use Value: Programmable TCRIT (default 110°C) and OS (default 85°C) outputs drive hardware shutdown and fan PWM independently - meets safety-critical response timing. |
Use Scenario: Fan control and overtemperature lockout in fanless industrial PCs deployed in factory automation cabinets. IC Role / Device Role / Timing Role: Local sensor monitors SoC temperature; remote channel tracks external power module diode via 20 cm PCB trace. Use Value: Digital filtering mitigates noise from nearby motor drivers - maintains ±1.5°C accuracy even with 40–125°C remote diode range and 100 pF trace capacitance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar remote diode temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM95235CIMM | 10-bit resolution, no TruTherm compensation, ±1.5°C remote accuracy at 45nm - lacks digital filter and beta correction | Targeted for older 90nm/130nm processors; not validated for Intel 45nm diode characteristics | Select only if cost-sensitive and thermal accuracy >±1.0°C is acceptable; requires separate calibration for beta drift |
| MAX6642AESA+ | 11-bit resolution, proprietary 2-wire interface (not SMBus), ±1.0°C remote accuracy, no digital filter | Designed for AMD platforms and generic diodes; lacks Intel-specific TruTherm modeling registers | Use when SMBus compatibility is not required and AMD or non-Intel diodes are present; requires custom driver integration |
Compared with LM95245CIMM, LM95235CIMM offers lower cost but sacrifices 0.75°C accuracy and diode-model adaptability, while MAX6642AESA+ trades SMBus interoperability for platform-specific optimization - LM95245CIMM remains optimal for Intel 45nm+ thermal validation and SMBus-based system management.
Availability
LM95245CIMM is available at Aetrix Electronics and suitable for laptop thermal management, server blade monitoring, and workstation GPU protection requiring stable component supply across extended product lifecycles.
Supply support for LM95245CIMM 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 with over 50 years of precision sensor innovation.
The LM95245CIMM belongs to TI's TruTherm®-enabled thermal sensor family, designed specifically for accurate remote diode monitoring in Intel microprocessor platforms from 90nm through 45nm process nodes.
FAQ
What is the remote temperature accuracy specification for LM95245CIMM under Intel 45nm processor conditions?
The LM95245CIMM achieves ±0.75°C maximum remote temperature accuracy when measuring Intel 45nm processor thermal diodes, tested over TA = 25°C to 85°C ambient and TD = 50°C to 105°C diode junction temperature. This specification is explicitly guaranteed in the datasheet for that exact process node and requires TruTherm compensation enabled and digital filter configured per default settings. LM95245CIMM must be calibrated using the Intel diode model selection register to achieve this accuracy.
Does LM95245CIMM support both signed and unsigned temperature output formats?
Yes, LM95245CIMM supports two distinct remote temperature formats simultaneously: a 12-bit plus sign (two's complement) format covering −128°C to +127.875°C, and a 13-bit unsigned format covering 0°C to +255.875°C. Both are accessible via separate register addresses, enabling seamless handling of negative cold-margin readings and high-temperature CPU throttling thresholds without software sign-extension logic. The local channel uses only the 10-bit signed format.
How does the digital filter in LM95245CIMM affect resolution and noise performance?
When enabled, the LM95245CIMM digital filter increases remote temperature resolution from 0.125°C to 0.03125°C (1/32°C) and suppresses transient noise from switching regulators or high-speed digital traces. The filter operates as a configurable FIR stage in the signal chain - its impulse and step responses are characterized in Figures 8–11 of the LM95245CIMM datasheet. Filter activation requires setting FE1/FE0 bits in Configuration Register 2 to '11'; filtered values are used for all TCRIT/OS comparisons.
Can LM95245CIMM operate in low-power standby mode while maintaining SMBus responsiveness?
Yes, LM95245CIMM enters standby mode when the STOP/RUN bit in Configuration Register 1 is set, reducing quiescent current to 300 µA. In this state, the SMBus interface remains fully active - the host can read status registers, modify configuration, and trigger a single-shot conversion by writing to the One-Shot register. The resulting local and remote temperature readings update all registers and assert TCRIT/OS outputs based on programmed thresholds - all without exiting standby.
What are the valid SMBus slave addresses for LM95245CIMM and how are they selected?
LM95245CIMM supports three SMBus addresses: 0x18, 0x19, and 0x29 - selected by pulling the OS/A0 pin (Pin 6) to GND (low), mid-supply (via resistor divider), or VDD (high), respectively. The LM95245CIMM-1 variant adds 0x4C and 0x4D options. Address detection occurs dynamically at power-up; the pin state is not latched. If unused, OS/A0 must be externally biased - no internal pull-up exists. All addresses comply with SMBus 2.0 7-bit addressing.
LM95245CIMM 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:
- Not For New Designs
- Sensor Type:
- Digital, Local/Remote
- Sensing Temperature - Local:
- -40°C ~ 85°C
- Sensing Temperature - Remote:
- -40°C ~ 85°C
- Output Type:
- SMBus
- Voltage - Supply:
- 3V ~ 3.6V
- Resolution:
- 10 b (Local), 12 b (Remote)
- Features:
- One-Shot, Output Switch, Programmable Resolution, Shutdown Mode, Standby Mode
- Accuracy - Highest (Lowest):
- ±2°C (±6°C)
- Test Condition:
- 25°C ~ 100°C (-40°C ~ 25°C)
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-VSSOP
LM95245CIMM FAQ
1.How can I place an order for LM95245CIMM through Aetrix?
Please submit a Request for Quotation (RFQ) for LM95245CIMM 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 LM95245CIMM reliable?
The price and inventory of LM95245CIMM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM95245CIMM is usually 5 days.
3.What payment methods are accepted for LM95245CIMM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM95245CIMM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM95245CIMM?
LM95245CIMM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM95245CIMM 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 LM95245CIMM?
For technical support, including LM95245CIMM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM95245CIMM requirements.
6.How does Aetrix verify that LM95245CIMM is sourced from the original manufacturer or authorized distributors?
All LM95245CIMM 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 LM95245CIMM meets industry standards.
7.What is the process for return or replacement of LM95245CIMM?
All LM95245CIMM units undergo pre-shipment inspection (PSI). If there is an issue with LM95245CIMM, 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 LM95245CIMM part is unused and in its original packaging.
Return procedure for LM95245CIMM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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