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Texas Instruments LM95235QEIMM
- Part No.:
- LM95235QEIMM
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM95235QEIMM.pdf
- Description:
- SENSOR DIGITAL -40C-85C 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,019
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Product details
Overview
LM95235QEIMM from Texas Instruments is a precision remote diode temperature sensor IC with SMBus 2.0 interface and TruTherm™ BJT beta compensation technology, measuring both local (±2.0°C max over –40°C to +85°C) and remote diode temperatures (±0.75°C max at TD = 60°C–100°C), operating from 3.0 V to 3.6 V, and used in thermal management of Intel 65/90 nm processors and MMBT3904-based systems.
For engineers reviewing the LM95235QEIMM datasheet, LM95235QEIMM pinout, LM95235QEIMM application, or LM95235QEIMM equivalent, this device delivers high-accuracy dual-zone thermal monitoring for automotive-grade embedded computing, supports programmable conversion rates (0.4–16 Hz), digital filtering for noise suppression on the remote channel, and open-drain T_CRIT/OS outputs for system-level thermal shutdown and fan control.
Technical Context
The LM95235QEIMM implements ΔVBE-based remote sensing with a sigma-delta ADC and TruTherm technology to correct for BJT beta variation across process nodes-enabling accurate measurement of thermal diodes in sub-micron processors (65/90 nm) and discrete transistors (MMBT3904). It uses a 16-bit left-justified data format with configurable resolution: 0.125°C (11-bit) without filter, 0.03125°C (13-bit) with digital filter enabled.
Its SMBus 2.0 slave interface supports three address options via OS/A0 pin (Low/Mid/High), timeout recovery, and no clock stretching. The device features shared hysteresis, diode fault detection, programmable T_CRIT and OS thresholds, and standby mode with one-shot conversion trigger-optimized for low-power thermal supervision in space-constrained automotive and industrial applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0 V to 3.6 V - compatible with standard 3.3 V rail; bypassing requires 10 µF || 0.1 µF || 100 pF |
| Operating Temperature Range | –40°C to +85°C - qualified for extended industrial environments per LM95235QEIMM grade |
| Remote Temp Accuracy | ±0.75°C max (TA = 25°C–85°C, TD = 60°C–100°C) - validated for Intel 65 nm processor diodes |
| Local Temp Accuracy | ±2.0°C max (TA = 25°C–100°C) - excludes self-heating effects; typical self-heating <0.5°C at 350 µA |
| Conversion Rate | 0.4 Hz to 16 Hz - adjustable via register; fastest full conversion (local + remote) ≤72 ms |
| Quiescent Current | 650 µA max at 1 Hz - drops to 300 µA in standby mode while retaining SMBus responsiveness |
| Digital Filter Resolution | 0.03125°C (13-bit unsigned / 12-bit signed) - enables sub-degree resolution for noise-sensitive PCB layouts |
Pinout & Package
LM95235QEIMM is housed in an 8-pin VSSOP package (DGK0008A), 3.0 mm × 3.0 mm, 0.65 mm pitch, thermally enhanced for surface-mount assembly in compact thermal sensor nodes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Power supply input | 3.0–3.6 V analog/digital rail; requires local 100 pF capacitor placed closest to pin |
| D+ (Pin 2) | Remote diode anode input | High-impedance analog input; forward-bias voltage must stay within ±50 mV of D− to avoid measurement corruption |
| D− (Pin 3) | Remote diode cathode input | Reference node for remote ΔVBE; source current up to 225 µA; sensitive to PCB leakage |
| T_CRIT (Pin 4) | Open-drain critical alert output | Active-low signal asserting when local or remote temp exceeds programmed T_CRIT limit (default 110°C remote / 85°C local) |
| GND (Pin 5) | Ground reference | Analog/digital common return; must be low-impedance and separated from noisy digital ground planes |
| OS/A0 (Pin 6) | Configurable I/O | Defaults to SMBus address select (A0); reprogrammable as open-drain over-temp shutdown output (OS) |
| SMBDAT (Pin 7) | SMBus bidirectional data | Open-drain; requires external pull-up; supports SMBus 2.0 timing including timeout reset (tTIMEOUT = 25–35 ms) |
| SMBCLK (Pin 8) | SMBus clock input | Asynchronous master-driven clock; no clock stretching; max frequency 100 kHz per SMBus 2.0 |
Key Features
| Feature | Design Value |
|---|---|
| TruTherm™ BJT Beta Compensation | Corrects for transistor beta drift across temperature and process variations-enabling ±0.75°C accuracy on 65 nm Intel diodes |
| Programmable Remote Diode Model | Selects between MMBT3904 or Intel 65/90 nm diode models via register bit-ensures optimal offset and gain calibration |
| Dual Temperature Data Formats | Supports both –128°C to +127.875°C (signed) and 0°C to +255.875°C (unsigned) ranges-enabling seamless integration with legacy and extended-range firmware |
| Shared Hysteresis Register | One 4-bit register configures hysteresis for all T_CRIT and OS limits-reducing register writes and simplifying thermal trip coordination |
| Diode Fault Detection | Monitors D+/D− continuity and reverse bias; flags open/short faults in status register-preventing false thermal alarms during power-up or diode failure |
Applications
| Laptop CPU Thermal Monitoring | Automotive ADAS Processor Supervision |
|---|---|
Use Scenario: Real-time junction temperature tracking of Intel Core i-series CPUs in thin-and-light notebooks with dynamic fan speed control and throttling. IC Role / Device Role / Timing Role: Dual-channel remote/local sensor providing SMBus-accessible temperature data every 1–2 seconds to EC or BIOS firmware. Use Value: Enables precise thermal margining using ±0.75°C remote accuracy on 65 nm diodes-reducing unnecessary throttling and extending sustained performance. |
Use Scenario: Monitoring thermal diodes on radar SoCs (e.g., TI AWR2944) in automotive ADAS ECUs operating from –40°C to +85°C ambient. IC Role / Device Role / Timing Role: AEC-Q100 Grade 3-compliant thermal supervisor triggering T_CRIT for safe shutdown before silicon damage occurs. Use Value: Validated operation at –40°C to +85°C with automotive-grade flow ensures reliability in under-hood environments without derating. |
| Industrial PLC CPU Module | Network Switch ASIC Thermal Guard |
Use Scenario: Continuous thermal oversight of ARM-based PLC controllers deployed in factory automation cabinets with limited airflow. IC Role / Device Role / Timing Role: Local sensor measures die temperature of controller IC; remote channel monitors external FPGA or power IC via MMBT3904. Use Value: Programmable digital filter suppresses EMI-induced noise on long PCB traces-maintaining ±2.0°C local and ±1.0°C remote accuracy in electrically noisy settings. |
Use Scenario: Protecting multi-core switch ASICs (e.g., Broadcom Tomahawk) from thermal runaway during traffic bursts in data center switches. IC Role / Device Role / Timing Role: Remote diode sensor interfaced to ASIC's on-die thermal diode; triggers OS output to activate redundant cooling fans. Use Value: Three-level address pin allows up to three LM95235QEIMM units on one SMBus segment-enabling per-ASIC thermal zoning without bus contention. |
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 |
|---|---|---|---|
| LM95235EIMM | Same architecture and pinout; wider operating range (–40°C to +90°C) and tighter remote accuracy (±0.5°C at TD = 60°C–100°C) | Preferred for industrial applications requiring >85°C ambient operation or higher remote accuracy | Select LM95235EIMM if ambient exceeds +85°C or remote diode accuracy better than ±0.75°C is required. |
| LM95235DIMM | Identical electrical specs and package; rated for –40°C to +90°C but specified with ±1.0°C remote accuracy (TD = 40°C–125°C) | Suitable for cost-sensitive industrial designs where extended remote diode range (to +125°C) is needed over absolute best accuracy | Choose LM95235DIMM when remote diode operation up to +125°C is required and ±1.0°C accuracy suffices. |
Compared with LM95235QEIMM, LM95235EIMM offers superior remote accuracy and higher ambient rating, while LM95235DIMM extends remote diode temperature range at a modest accuracy trade-off-both retain identical SMBus register maps, pinout, and software compatibility.
Availability
LM95235QEIMM is available at Aetrix Electronics and suitable for automotive ADAS modules, industrial PLCs, and network infrastructure equipment requiring stable component supply with guaranteed lifecycle support and traceable sourcing.
Supply support for LM95235QEIMM 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 automotive-grade IC design.
The LM95235 product line was developed specifically for high-accuracy thermal monitoring in advanced microprocessors and SoCs-addressing beta drift, noise immunity, and SMBus integration challenges in automotive, computing, and industrial systems.
FAQ
What is the operating temperature range for the LM95235QEIMM?
The LM95235QEIMM is rated for an ambient operating temperature range of –40°C to +85°C, making it suitable for extended industrial and automotive under-hood applications. This specification is explicitly defined in the Electrical Characteristics table of the SNIS142F datasheet for the QEIMM variant, and differs from the EIMM (–40°C to +90°C) and CIMM (0°C to +90°C) versions.
Does the LM95235QEIMM support Intel 90 nm processor diodes?
Yes, the LM95235QEIMM supports both Intel 65 nm and 90 nm processor diodes via its programmable diode model selection bit. The datasheet confirms TruTherm™ technology is optimized for "Intel® processor on a 65 nm or 90 nm process", and accuracy specifications (±0.75°C) apply across that range when TD = 60°C to 100°C and TA = 25°C to 85°C.
How does the digital filter affect resolution and response time in the LM95235QEIMM?
When enabled, the digital filter in the LM95235QEIMM increases remote temperature resolution from 0.125°C (11-bit) to 0.03125°C (13-bit), but introduces step-response delay-typical settling time is ~150 ms for a 17°C step. The filter is configured via bits FE1/FE0 in Configuration Register 2 and is recommended for noisy PCB environments or long diode traces.
Can the OS/A0 pin on the LM95235QEIMM be used as both address select and over-temperature output?
No-the OS/A0 pin functions exclusively as either an SMBus address input (A0) or an open-drain over-temperature output (OS), not both simultaneously. Per the datasheet, it defaults to A0 after power-up; reconfiguration to OS output is only possible when the pin is held high, and doing so locks the SMBus address to 4Ch (binary 100 1100).
Is the LM95235QEIMM pin-compatible with the LM86 or LM89?
Yes, the LM95235QEIMM is explicitly stated in the datasheet as "pin-for-pin compatible with the LM86 and LM89". All three devices use the same 8-pin VSSOP (DGK) package, identical pin assignments (including VDD, D+, D−, T_CRIT, GND, OS/A0, SMBDAT, SMBCLK), and share register-level compatibility for basic temperature readback and limit configuration.
LM95235QEIMM 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 Limit, 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:
- Automotive
- Qualification:
- AEC-Q100
- Supplier Device Package:
- 8-VSSOP
LM95235QEIMM FAQ
1.How can I place an order for LM95235QEIMM through Aetrix?
Please submit a Request for Quotation (RFQ) for LM95235QEIMM 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 LM95235QEIMM reliable?
The price and inventory of LM95235QEIMM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM95235QEIMM is usually 5 days.
3.What payment methods are accepted for LM95235QEIMM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM95235QEIMM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM95235QEIMM?
LM95235QEIMM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM95235QEIMM 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 LM95235QEIMM?
For technical support, including LM95235QEIMM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM95235QEIMM requirements.
6.How does Aetrix verify that LM95235QEIMM is sourced from the original manufacturer or authorized distributors?
All LM95235QEIMM 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 LM95235QEIMM meets industry standards.
7.What is the process for return or replacement of LM95235QEIMM?
All LM95235QEIMM units undergo pre-shipment inspection (PSI). If there is an issue with LM95235QEIMM, 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 LM95235QEIMM part is unused and in its original packaging.
Return procedure for LM95235QEIMM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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