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Texas Instruments LM95245CIMX
- Part No.:
- LM95245CIMX
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM95245CIMX.pdf
- Description:
- SENSOR DIGITAL -40C-85C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,849
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Product details
Overview
LM95245CIMX 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 T_CRIT/OS thresholds. It operates from 3.0–3.6 V and targets thermal management in laptops, desktops, and servers.
For engineers reviewing the LM95245CIMX datasheet, LM95245CIMX pinout, LM95245CIMX application, or LM95245CIMX equivalent, this page delivers verified technical context, real-world design meaning of specifications, validated pin functions, confirmed alternative parts with documented differences, and supply support for volume procurement and BOM continuity.
Technical Context
The LM95245CIMX implements ΔVBE-based remote diode sensing with a Sigma-Delta ADC and TruTherm technology to correct for beta variation in sub-90nm process thermal diodes. Its dual-channel architecture independently digitizes local die temperature and external diode junction temperature using 11-bit signed (local) and 13-bit filtered/11-bit unfiltered (remote) formats.
It features a programmable digital filter on the remote channel (0.03125°C LSB when enabled), shared hysteresis register for OS/TCRIT comparators, and SMBus 2.0 interface with timeout reset capability. The OS/A0 pin serves as either address select (three configurable slave addresses) or open-drain overtemperature output, with default A0 input behavior at power-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0–3.6 V - Compatible with standard 3.3 V system rails; requires 10 µF + 0.1 µF + 100 pF bypass network. |
| Remote Accuracy | ±0.75°C max (TA=25–85°C, TD=50–105°C) - Validated for Intel 45nm processor diodes with TruTherm compensation. |
| Local Accuracy | ±2.0°C max (TA=25–100°C) - Specifies on-die temperature measurement error excluding self-heating effects. |
| Resolution (Remote) | 0.03125°C (filter on) / 0.125°C (filter off) - Enables fine-grained thermal control in high-performance computing systems. |
| Conversion Rate | 0.4–16 Hz - Adjustable via register; impacts quiescent current (350 µA typ @ 1 Hz) and thermal update latency. |
| SMBus Compatibility | SMBus 2.0 compliant - Supports timeout reset, no clock stretching, 7-bit addressing with three hardware-selectable addresses. |
| Operating Temp | −40°C to +125°C - Qualified for industrial and computing environments including CPU socket proximity. |
Pinout & Package
LM95245CIMX is packaged in an 8-pin VSSOP (DGK0008A) - 3.0 mm × 3.0 mm, 0.65 mm pitch, thermally enhanced for PCB-mounted thermal diode monitoring.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VDD | Power supply input | 3.0–3.6 V rail; requires local 10 µF + 0.1 µF + 100 pF decoupling to minimize noise-induced reading errors. |
| 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; includes internal 400 mV bias source and ESD protection (Circuit A). |
| 4 T_CRIT | Critical temperature alert output | Open-drain active-low output asserting when local or remote temp exceeds programmed TCRIT limit; requires external pull-up. |
| 5 GND | Ground reference | Primary return path for analog and digital circuits; must be low-impedance connection to minimize offset errors. |
| 6 OS/A0 | Configurable I/O | Defaults to address select (A0); sets SMBus slave address (18h/29h/4Ch); programmable as open-drain OS output (active low). |
| 7 SMBDAT | SMBus bidirectional data | Open-drain SMBus data line; requires external pull-up; supports timeout reset when held low >25 ms. |
| 8 SMBCLK | SMBus clock input | Asynchronous clock input (10–100 kHz); device never drives this line; no clock stretching supported. |
Key Features
| Feature | Design Value |
|---|---|
| TruTherm® BJT Beta Compensation | Enables ±0.75°C remote accuracy on Intel 45nm processor diodes by dynamically correcting for transistor beta drift across temperature and process variation. |
| Programmable Remote Digital Filter | Reduces noise-induced temperature jitter and improves resolution to 0.03125°C - critical for stable fan control and throttling decisions in high-speed CPUs. |
| Dual Temperature Formats | Supports both −128°C to +127.875°C (signed) and 0°C to +255.875°C (unsigned) remote ranges - allows seamless handling of negative cold-room or high-ambient server environments. |
| Three-Level Address Pin (OS/A0) | Permits up to three LM95245CIMX devices on one SMBus segment without address conflict - simplifies multi-zone thermal monitoring in dense compute platforms. |
| Standby Mode with One-Shot Trigger | Reduces quiescent current to 300 µA while retaining SMBus responsiveness; host can initiate single conversion via register write - ideal for power-constrained mobile designs. |
Applications
| Laptop CPU Thermal Monitoring | Server Blade Rack Management |
|---|---|
|
Use Scenario: Real-time junction temperature tracking of Intel Core i-series CPUs in ultrabooks with dynamic thermal throttling. IC Role / Device Role / Timing Role: Remote diode sensor interfacing directly to CPU's on-die thermal diode; provides SMBus-accessible 0.125°C-resolution readings every 62.5 ms at 16 Hz. Use Value: Enables precise Tj-based DVFS and fan speed control, reducing acoustic noise while maintaining performance within Intel's thermal specification limits. |
Use Scenario: Distributed thermal supervision across dual-socket Xeon processors and VRMs in 1U rack servers. IC Role / Device Role / Timing Role: Local + remote sensor co-located on motherboard near CPU socket and VRM heatsink; reports via shared SMBus to BMC. Use Value: Delivers independent fault detection (diode open/short) and hysteresis-controlled T_CRIT/OS alerts to prevent thermal runaway during sustained workloads. |
| Workstation GPU Cooling Control | Industrial Embedded Controller |
|
Use Scenario: Closed-loop thermal management for NVIDIA Quadro GPUs in CAD/CAM workstations with variable fan profiles. IC Role / Device Role / Timing Role: Remote sensor connected to GPU die diode; local sensor monitors ambient board temperature near VRM; both channels sampled synchronously. Use Value: Achieves ±0.75°C remote accuracy required for GPU thermal guardbanding, enabling aggressive cooling only when needed - extending fan lifetime. |
Use Scenario: Fanless industrial PC operating in −40°C to +85°C ambient with passive cooling and thermal derating logic. IC Role / Device Role / Timing Role: Local temperature monitor for SoC die; remote channel unused or tied to heatsink diode; operates in low-power standby mode between 1-Hz updates. Use Value: Maintains 350 µA typical supply current at 1 Hz, minimizing self-heating impact on local reading accuracy in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital remote diode temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM95235CIMMX | 10-bit resolution (0.25°C LSB), no digital filter, ±1.5°C remote accuracy at 45nm, same 8-pin VSSOP package and pinout. | Lacks TruTherm compensation and remote filtering - suitable for cost-sensitive designs where ±1.5°C accuracy suffices and noise immunity is less critical. | Select LM95235CIMMX only if lower resolution and reduced accuracy are acceptable; not drop-in for precision thermal control loops. |
| MAX6642AESA+ | 11-bit remote channel, ±1.0°C accuracy (45nm), 5V-tolerant SMBus I/O, different pinout (SOIC-8), no TruTherm but includes internal diode model selection. | Supports wider VDD range (3.0–5.5 V); better suited for mixed-voltage systems; lacks Intel-specific 45nm optimization and shared hysteresis register. | Choose MAX6642AESA+ when interfacing with non-Intel diodes or requiring 5V-tolerant SMBus; requires PCB layout change due to non-pin-compatible footprint. |
Compared with LM95245CIMX, LM95235CIMMX trades resolution and TruTherm accuracy for lower cost and simpler configuration, while MAX6642AESA+ offers broader voltage compatibility at the expense of Intel 45nm optimization and pinout compatibility.
Availability
LM95245CIMX is available at Aetrix Electronics and suitable for laptop thermal management, server rack monitoring, and workstation GPU cooling requiring stable component supply, long-term BOM continuity, and guaranteed industrial temperature grade operation.
Supply support for LM95245CIMX 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 solutions, with decades of expertise in precision sensing and thermal management ICs.
The LM95245CIMX belongs to TI's high-accuracy remote diode sensor product line, designed specifically for thermal monitoring of advanced-node microprocessors and GPUs in computing platforms demanding sub-degree accuracy and SMBus integration.
FAQ
What is the remote temperature accuracy of the LM95245CIMX when used with an Intel 45nm processor diode?
The LM95245CIMX achieves ±0.75°C maximum remote temperature accuracy when measuring an Intel 45nm processor diode under conditions TA = 25°C to 85°C and TD = 50°C to 105°C. This specification is enabled by TruTherm® BJT beta compensation and is explicitly validated in the datasheet for that process node. Accuracy degrades to ±1.5°C when TD extends to 40°C–125°C, and the LM95245CIMX must be configured for the correct diode model to maintain this performance.
Does the LM95245CIMX support both signed and unsigned temperature output formats for the remote channel?
Yes, the LM95245CIMX supports simultaneous signed (−128°C to +127.875°C) and unsigned (0°C to +255.875°C) 16-bit left-justified remote temperature outputs. When the digital filter is disabled, the remote reading uses 11-bit signed or 11-bit unsigned format (0.125°C LSB); with the filter enabled, it uses 12-bit signed or 13-bit unsigned format (0.03125°C LSB). Both formats are accessible via separate register addresses, allowing firmware to handle negative temperatures and values above 128°C without rollover.
Can the OS/A0 pin on the LM95245CIMX be used as both an address input and an overtemperature output?
The OS/A0 pin on the LM95245CIMX is configurable but not simultaneously dual-function: it defaults to address input (A0) at power-up and can be reprogrammed as an open-drain OS output only when driven high externally. When used as OS, the device accepts only the 4Ch SMBus address; when used as A0, it supports three addresses (18h, 29h, 4Ch) depending on whether A0 is tied low, mid-supply, or high. The pin cannot serve both roles concurrently, and improper biasing causes indeterminate addressing.
What is the purpose and effect of the programmable digital filter on the remote channel of the LM95245CIMX?
The programmable digital filter on the LM95245CIMX remote channel suppresses noise-induced temperature jitter and improves measurement resolution from 0.125°C to 0.03125°C. Enabled via Configuration Register 2 bits FE1/FE0, it applies a finite impulse response (FIR) filter that reduces sensitivity to transient ESD or switching noise on the D+/D− lines. Filtered readings are used for all T_CRIT and OS comparisons, making thermal alerts more robust in electrically noisy server or GPU environments - though at the cost of increased conversion latency.
Is the LM95245CIMX pin-compatible with other TI temperature sensors like the LM95235 or LM86?
Yes, the LM95245CIMX is explicitly pin-for-pin compatible with the LM95235, LM86, LM89, and LM99 per the datasheet. All share the same 8-pin VSSOP/SOIC footprint, identical pin assignments (VDD, D+, D−, T_CRIT, GND, OS/A0, SMBDAT, SMBCLK), and compatible SMBus register map structure. This allows direct replacement in existing designs - though firmware must verify support for TruTherm, digital filtering, and extended resolution features unique to the LM95245CIMX.
LM95245CIMX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- TruTherm™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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-SOIC
LM95245CIMX FAQ
1.How can I place an order for LM95245CIMX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM95245CIMX 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 LM95245CIMX reliable?
The price and inventory of LM95245CIMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM95245CIMX is usually 5 days.
3.What payment methods are accepted for LM95245CIMX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM95245CIMX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM95245CIMX?
LM95245CIMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM95245CIMX 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 LM95245CIMX?
For technical support, including LM95245CIMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM95245CIMX requirements.
6.How does Aetrix verify that LM95245CIMX is sourced from the original manufacturer or authorized distributors?
All LM95245CIMX 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 LM95245CIMX meets industry standards.
7.What is the process for return or replacement of LM95245CIMX?
All LM95245CIMX units undergo pre-shipment inspection (PSI). If there is an issue with LM95245CIMX, 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 LM95245CIMX part is unused and in its original packaging.
Return procedure for LM95245CIMX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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