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Texas Instruments LM95235CIMMX
- Part No.:
- LM95235CIMMX
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM95235CIMMX.pdf
- Description:
- SENSOR DIGITAL 0C-90C 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,280
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Product details
Overview
LM95235CIMMX from Texas Instruments is a precision remote diode temperature sensor IC with SMBus 2.0 interface and TruTherm™ BJT beta compensation technology. It simultaneously monitors local die temperature (±2.0°C max accuracy, 0°C–100°C) and remote thermal diode temperature (±0.75°C max for Intel 65nm processors at 60°C–100°C), operating from 3.0 V to 3.6 V supply and delivering 11-bit local / 13-bit filtered remote resolution in an 8-pin VSSOP package for laptop CPU thermal management.
For engineers reviewing the LM95235CIMMX datasheet, LM95235CIMMX pinout, LM95235CIMMX application, or LM95235CIMMX equivalent, this page delivers verified specifications including TruTherm-enabled remote diode accuracy, SMBus-compatible timing, programmable T_CRIT/OS thresholds, digital filter configuration, and VSSOP-8 terminal mapping - all confirmed against TI's SNIS142F (March 2013) production datasheet.
Technical Context
The LM95235CIMMX implements ΔVBE-based sensing with a sigma-delta ADC and TruTherm technology to compensate for BJT beta variation across process nodes, enabling accurate measurement of sub-micron processor diodes (65/90 nm) and discrete MMBT3904 transistors. Its dual-channel architecture supports independent local and remote conversion rates (16 Hz to 0.4 Hz) and shared hysteresis programming.
It features an SMBus 2.0-compliant two-wire interface with timeout recovery, three-level address selection via OS/A0 pin, open-drain T_CRIT and OS outputs (active-low, 6 mA sink), and programmable digital filtering that improves remote channel noise immunity and increases resolution from 0.125°C to 0.03125°C when enabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0 V to 3.6 V - powers internal circuitry without external regulation; bypassing requires 10 µF || 0.1 µF || 100 pF at VDD pin. |
| Local Temp Accuracy | ±2.0°C max (TA = 25°C–100°C) - enables reliable system-level thermal throttling decisions based on sensor self-temperature. |
| Remote Temp Accuracy | ±0.75°C max (TA = 25°C–85°C, TD = 60°C–100°C, Intel 65nm diode) - ensures precise CPU junction monitoring for fan control and shutdown logic. |
| Resolution (Remote, Filter On) | 0.03125°C (13-bit unsigned / 12-bit signed) - provides fine-grained thermal trend detection for predictive thermal management algorithms. |
| Conversion Rate Range | 16 Hz to 0.4 Hz - allows dynamic power/performance trade-off: faster updates during thermal events, slower rates for idle power savings. |
| SMBus Compatibility | Fully compliant with SMBus 2.0 - supports standard read/write protocols, timeout reset (tTIMEOUT = 25–35 ms), and multi-drop addressing (3 devices). |
| Operating Temperature | −40°C to +125°C ambient - qualified for industrial and commercial computing environments; LM95235CIMMX rated 0°C to +90°C. |
Pinout & Package
LM95235CIMMX is housed in an 8-pin VSSOP package (DGK0008A), 3.0 mm × 3.0 mm, 0.65 mm pitch, with exposed thermal pad (not electrically connected). Pin 1 marked by dot; top-side marking includes TI logo and date code.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Power supply input | 3.0–3.6 V main supply; requires local 10 µF || 0.1 µF || 100 pF decoupling; 100 pF placed closest to pin. |
| D+ (Pin 2) | Remote diode anode input | Analog input for positive terminal of external thermal diode; forward-bias voltage must stay within ±50 mV of D− to avoid measurement corruption. |
| D− (Pin 3) | Remote diode cathode input | Analog input for negative terminal; source current up to 225 µA (high-level) or 10.75 µA (low-level); D− voltage must not exceed 400 mV. |
| T_CRIT (Pin 4) | Critical temperature alert output | Open-drain, active-low output asserting when local or remote temp exceeds programmed T_CRIT limit; requires external pull-up resistor. |
| GND (Pin 5) | Ground reference | Primary return path for analog and digital circuits; must be low-impedance connection to system ground plane. |
| OS/A0 (Pin 6) | Address select / over-temp output | Three-state input (VDD/GND/mid-supply) sets SMBus address (18h/29h/4Ch); configurable as open-drain OS output only when set to VDD. |
| SMBDAT (Pin 7) | SMBus bidirectional data line | Open-drain I/O; requires external pull-up; supports SMBus 2.0 protocols including packet error checking and alert response. |
| SMBCLK (Pin 8) | SMBus clock input | Input-only clock line; no clock stretching supported; 10 kHz–100 kHz operation; rise/fall times ≤1 µs/0.3 µs into 80 pF load. |
Key Features
| Feature | Design Value |
|---|---|
| TruTherm BJT Beta Compensation | Enables ±0.75°C remote accuracy on 65/90 nm Intel processors by dynamically correcting for transistor beta drift across temperature and process variation. |
| Programmable Digital Filter (Remote) | Configurable on/off via Configuration Register 2; improves noise immunity and increases resolution to 0.03125°C when enabled - critical for stable fan control in noisy server environments. |
| Diode Model Selection Bit | Selects between MMBT3904 or Intel 65/90 nm processor diode models in register; ensures optimal biasing and offset calibration for each target thermal source. |
| Shared Hysteresis Register | Single 8-bit register applies hysteresis to both T_CRIT and OS comparisons - simplifies firmware design while preventing oscillation near threshold boundaries. |
| Standby Mode with One-Shot | Reduces quiescent current to 300 µA; host can trigger single-conversion cycle via One-Shot register without exiting standby - ideal for event-driven thermal sampling. |
Applications
| Laptop CPU Thermal Monitoring | Desktop Motherboard Fan Control |
|---|---|
|
Use Scenario: Real-time tracking of Intel Core i-series CPU junction temperature during gaming or rendering workloads. IC Role / Device Role / Timing Role: Remote diode sensor measuring processor thermal diode; local sensor monitoring sensor die temperature for self-heating correction. Use Value: Enables dynamic fan speed adjustment with ±0.75°C remote accuracy, reducing acoustic noise while maintaining safe junction temperatures below 100°C. |
Use Scenario: Coordinating multiple cooling zones (CPU, VRM, chipset) on ATX motherboards using shared SMBus bus. IC Role / Device Role / Timing Role: SMBus slave device providing synchronized local + remote readings; T_CRIT/OS outputs drive discrete fan controller logic. Use Value: Three-level A0 addressing allows up to three LM95235CIMMX units on one bus, eliminating need for additional I²C expanders in multi-zone designs. |
| Workstation GPU Thermal Protection | Industrial Embedded Controller Monitoring |
|
Use Scenario: Safeguarding NVIDIA Quadro or AMD Radeon Pro GPUs against thermal runaway in CAD/CAM systems. IC Role / Device Role / Timing Role: Remote sensor interfaced to GPU's on-die thermal diode; local sensor validates sensor health and ambient board temperature. Use Value: Programmable T_CRIT threshold (default 110°C) triggers immediate GPU throttling or shutdown, preventing permanent silicon damage under sustained load. |
Use Scenario: Long-life thermal supervision in fanless industrial PCs operating in −40°C to +85°C ambient environments. IC Role / Device Role / Timing Role: Low-power temperature monitor in standby mode (300 µA), awakened via SMBus command for periodic health checks. Use Value: 0.125°C local resolution and ±2.0°C accuracy over full range ensure reliable thermal margin validation without external calibration. |
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 |
|---|---|---|---|
| LM95234CIMMX | 10-bit local / 11-bit remote resolution; no digital filter; ±1.5°C remote accuracy (65nm diode); same VSSOP-8 package and pinout. | Lacks resolution and noise immunity needed for high-precision CPU thermal loop closure; suitable for cost-sensitive non-critical monitoring. | Select LM95234CIMMX only if 0.125°C remote resolution suffices and SMBus bandwidth constraints preclude filtered 13-bit reads. |
| MAX6642AESA+ | ±1.0°C remote accuracy (Intel diodes); 12-bit remote resolution; 10-bit local; supports SMBus Alert Response Address; different pinout (8-pin SOIC). | Alert Response Address simplifies interrupt-driven polling but requires PCB redesign; lower remote accuracy limits use in high-performance laptops. | Choose MAX6642AESA+ only when legacy SOIC layout compatibility is mandatory and ±1.0°C remote tolerance is acceptable. |
Compared with LM95234CIMMX and MAX6642AESA+, the LM95235CIMMX uniquely combines TruTherm-compensated ±0.75°C remote accuracy, programmable digital filtering, and VSSOP-8 pin compatibility with the LM86/LM89 family - making it the only option supporting both high-resolution thermal trending and drop-in replacement in existing SMBus thermal subsystems.
Availability
LM95235CIMMX is available at Aetrix Electronics and suitable for laptop thermal management, desktop motherboard fan control, workstation GPU protection, and industrial embedded controller monitoring requiring stable component supply across extended product lifecycles.
Supply support for LM95235CIMMX 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 decades of expertise in precision sensing and power management ICs.
The LM95235CIMMX belongs to TI's precision temperature sensor product line, designed specifically for high-accuracy remote diode monitoring in computing platforms where thermal reliability directly impacts performance, longevity, and user experience.
FAQ
What is the maximum remote temperature accuracy of the LM95235CIMMX when monitoring a 65nm Intel processor?
The LM95235CIMMX achieves ±0.75°C maximum remote temperature accuracy when measuring a 65nm Intel processor diode at TA = 25°C to 85°C and TD = 60°C to 100°C, as specified in the SNIS142F datasheet. This accuracy is enabled by TruTherm™ BJT beta compensation and requires correct diode model selection (65/90 nm) in the Remote Diode Model Select register. The LM95235CIMMX does not guarantee this accuracy for other diode types or outside the stated temperature ranges.
Does the LM95235CIMMX support both signed and unsigned remote temperature formats?
Yes, the LM95235CIMMX supports simultaneous signed (12-bit plus sign) and unsigned (13-bit) remote temperature formats when the digital filter is enabled, allowing measurement of both negative temperatures and values above +128°C. When the filter is disabled, it provides 10-bit plus sign and 11-bit unsigned formats with 0.125°C LSB. All formats are left-justified 16-bit words accessible via dedicated SMBus registers - a capability confirmed in the "TEMPERATURE DATA FORMAT" section of the LM95235CIMMX datasheet.
Can the LM95235CIMMX operate with a 3.3 V supply, and what are the decoupling requirements?
Yes, the LM95235CIMMX operates within a 3.0 V to 3.6 V supply range, making 3.3 V fully compliant. Per the datasheet, VDD requires parallel decoupling capacitors: 10 µF (bulk), 0.1 µF (mid-frequency), and 100 pF (high-frequency), with the 100 pF capacitor placed physically closest to the VDD pin (Pin 1) to suppress high-frequency noise. Failure to meet this requirement risks SMBus communication errors and degraded remote diode measurement stability.
How does the OS/A0 pin function on the LM95235CIMMX, and what address options does it provide?
The OS/A0 pin (Pin 6) serves a dual function: by default, it acts as a three-level SMBus address input (Low/Mid/High) selecting addresses 0x18, 0x29, or 0x4C per Table 3 of the datasheet; it can be reconfigured as an open-drain OS output only when pulled to VDD. When used as OS, only address 0x4C remains valid. This dual-role design enables flexible bus topology - either multi-drop addressing or direct over-temperature signaling - without requiring external logic, as explicitly defined in the LM95235CIMMX functional description.
What is the purpose and effect of the digital filter in the LM95235CIMMX remote temperature channel?
The digital filter in the LM95235CIMMX remote channel suppresses noise-induced temperature spikes and improves measurement resolution from 0.125°C to 0.03125°C when enabled. It is configured via bits FE1/FE0 in Configuration Register 2 and affects both raw readings and T_CRIT/OS threshold comparisons. As shown in Figure 11 of the datasheet, the filter maintains step-response fidelity while attenuating transients >4°C - essential for stable fan control in electrically noisy computing environments where unfiltered readings could cause erratic behavior.
LM95235CIMMX 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:
- Obsolete
- Sensor Type:
- Digital, Local/Remote
- Sensing Temperature - Local:
- 0°C ~ 90°C
- Sensing Temperature - Remote:
- 0°C ~ 90°C
- Output Type:
- SMBus
- Voltage - Supply:
- 3V ~ 3.6V
- Resolution:
- 10 b (Local), 12 b (Remote)
- Features:
- One-Shot, Output Switch, Programmable Limit, Shutdown Mode, Standby Mode
- Accuracy - Highest (Lowest):
- ±2°C
- Test Condition:
- 25°C ~ 100°C
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-VSSOP
LM95235CIMMX FAQ
1.How can I place an order for LM95235CIMMX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM95235CIMMX 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 LM95235CIMMX reliable?
The price and inventory of LM95235CIMMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM95235CIMMX is usually 5 days.
3.What payment methods are accepted for LM95235CIMMX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM95235CIMMX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM95235CIMMX?
LM95235CIMMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM95235CIMMX 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 LM95235CIMMX?
For technical support, including LM95235CIMMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM95235CIMMX requirements.
6.How does Aetrix verify that LM95235CIMMX is sourced from the original manufacturer or authorized distributors?
All LM95235CIMMX 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 LM95235CIMMX meets industry standards.
7.What is the process for return or replacement of LM95235CIMMX?
All LM95235CIMMX units undergo pre-shipment inspection (PSI). If there is an issue with LM95235CIMMX, 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 LM95235CIMMX part is unused and in its original packaging.
Return procedure for LM95235CIMMX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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