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Texas Instruments LM95235CIMM/NOPB
- Part No.:
- LM95235CIMM/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM95235CIMM/NOPB.pdf
- Description:
- SENSOR DIGITAL 0C-90C 8VSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM95235CIMM/NOPB 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 from 25°C to 100°C) and remote thermal diode temperature (±0.75°C max over 60–100°C for 65nm Intel processors), operating from 3.0 V to 3.6 V supply and consuming only 350 µA typical at 1 Hz conversion rate. It is used in laptop, desktop, and server CPU thermal management systems for fan control and critical shutdown.
For engineers reviewing the LM95235CIMM/NOPB datasheet, LM95235CIMM/NOPB pinout, LM95235CIMM/NOPB application, or LM95235CIMM/NOPB equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated 8-pin VSSOP package mapping, confirmed SMBus-compatible operation, and two rigorously cross-checked alternative parts - all grounded in TI's SNIS142F datasheet and official product folder.
Technical Context
The LM95235CIMM/NOPB implements ΔVBE-based remote sensing with a sigma-delta ADC and TruTherm technology to compensate for BJT beta variation across process nodes - enabling accurate measurement of thermal diodes in 65/90 nm Intel processors and MMBT3904 transistors. Its dual-channel architecture supports independent local (11-bit resolution, 0.125°C LSB) and remote (11-bit or 13-bit filtered, 0.03125°C LSB) temperature digitization.
It features programmable digital filtering on the remote channel, three-level SMBus address selection via OS/A0 pin, open-drain T_CRIT and OS outputs with shared hysteresis, and standby mode with one-shot conversion trigger. All registers are accessible via SMBus 2.0-compliant interface with timeout recovery and no clock stretching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0 V to 3.6 V - matches standard 3.3 V system rails; bypassing requires 10 µF || 0.1 µF || 100 pF per datasheet Figure 1. |
| Local Temp Accuracy | ±2.0 °C max (25°C to 100°C) - sufficient for host processor die monitoring without calibration. |
| Remote Temp Accuracy | ±0.75 °C max (25–85°C ambient, 60–100°C diode) - validated for 65 nm Intel processor diodes using TruTherm compensation. |
| Conversion Rate | 16 Hz to 0.4 Hz (63 ms fastest full conversion) - enables dynamic power/performance trade-off in thermal loop design. |
| Digital Filter Resolution | 0.03125 °C LSB (13-bit filtered remote output) - improves noise immunity and resolution for high-precision diode monitoring. |
| SMBus Compatibility | Fully compliant with SMBus 2.0 - supports standard host-side thermal management firmware without custom drivers. |
| Operating Temperature | 0°C to +90°C ambient (LM95235CIMM grade) - qualified for commercial computing environments, not automotive. |
Pinout & Package
LM95235CIMM/NOPB uses an 8-pin VSSOP package (TI package code DGK0008A), 3.0 mm × 3.0 mm body, 0.65 mm pitch, with exposed thermal pad (not electrically connected). Pin 1 is marked by beveled corner; device orientation follows JEDEC MO-178.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Power supply input | Must be decoupled with 10 µF || 0.1 µF || 100 pF; 100 pF placed closest to pin per layout guidance. |
| D+ (Pin 2) | Remote diode anode input | High-impedance analog input; forward-bias voltage >50 mV corrupts measurement per ESD note. |
| D− (Pin 3) | Remote diode cathode input | Accepts up to ±1 mA input current; source voltage limited to 400 mV to avoid error. |
| T_CRIT (Pin 4) | Critical temperature alert output | Open-drain, active-low; requires external pull-up; asserts when local or remote exceeds programmed TCRIT limit. |
| GND (Pin 5) | Ground reference | Common return for analog and digital circuits; must connect to low-noise system ground plane. |
| OS/A0 (Pin 6) | Address select / over-temp output | Configurable as SMBus address input (Low/Mid/High) or open-drain OS output; defaults to A0 after power-up. |
| SMBDAT (Pin 7) | SMBus bidirectional data line | Open-drain I/O; requires external pull-up; supports 10–100 kHz SMBus clock with 80 pF load. |
| SMBCLK (Pin 8) | SMBus clock input | CMOS input; no clock stretching; timing meets SMBus 2.0 tLOW ≥4.7 µs, tHIGH ≥25 ms. |
Key Features
| Feature | Design Value |
|---|---|
| TruTherm™ BJT beta compensation | Enables ±0.75°C remote accuracy on 65/90 nm Intel processor diodes - eliminates need for per-die calibration. |
| Programmable remote digital filter | Switches resolution from 0.125°C (11-bit) to 0.03125°C (13-bit) and suppresses noise-induced false alarms in noisy CPU environments. |
| Three-level SMBus address pin (OS/A0) | Allows up to 3 LM95235CIMM/NOPB devices on same bus - simplifies multi-zone thermal monitoring without address conflicts. |
| Shared hysteresis register | Reduces register overhead and ensures consistent hysteresis behavior across T_CRIT and OS thresholds for stable thermal control loops. |
| Standby mode with one-shot trigger | Reduces quiescent current to 300 µA while retaining SMBus responsiveness - ideal for low-power polling architectures. |
Applications
| Laptop CPU Thermal Management | Desktop Workstation Fan Control |
|---|---|
Use Scenario: Real-time monitoring of Intel Core i5/i7 CPU die and VRM thermal diodes during variable-load workloads. IC Role / Device Role / Timing Role: Remote diode sensor feeding SMBus data to EC or BMC for closed-loop fan speed adjustment and throttling decisions. Use Value: ±0.75°C remote accuracy prevents premature throttling and enables aggressive cooling profiles without thermal runaway risk. |
Use Scenario: Dual-zone thermal supervision of CPU and GPU diodes in high-performance desktop motherboards. IC Role / Device Role / Timing Role: Local + remote temperature acquisition node interfacing with BIOS-based thermal policy engine via SMBus. Use Value: Programmable T_CRIT/OS thresholds and shared hysteresis simplify firmware implementation of multi-trigger thermal safety logic. |
| Server Blade Processor Monitoring | Embedded Industrial Controller Thermal Protection |
Use Scenario: Rack-level thermal telemetry for Xeon Scalable processors in dense 1U/2U servers with multiple DIMMs and PCIe accelerators. IC Role / Device Role / Timing Role: SMBus slave reporting local sensor temp and remote CPU diode temp to baseboard management controller (BMC). Use Value: 13-bit filtered remote resolution (0.03125°C) detects subtle thermal drift before catastrophic failure in mission-critical compute. |
Use Scenario: Temperature supervision of FPGA or SoC junction in fanless industrial PLCs operating in 0–70°C ambient. IC Role / Device Role / Timing Role: Standby-mode temperature monitor triggering hardware shutdown via T_CRIT pin when local die exceeds 90°C. Use Value: 300 µA standby current and direct-open-drain T_CRIT assertion enable fail-safe thermal protection without software intervention. |
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 |
|---|---|---|---|
| LM95234CIMM/NOPB | Single remote channel only; no local temperature sensor; identical SMBus interface and TruTherm engine. | Used where only CPU diode monitoring is required - reduces BOM cost and board space vs. dual-channel LM95235CIMM/NOPB. | Select LM95234CIMM/NOPB when local die temperature monitoring is unnecessary and cost optimization is prioritized. |
| MAX6642AESA+ | Maxim part with ±1.0°C remote accuracy (worse than LM95235CIMM/NOPB's ±0.75°C); supports 3.3 V supply but lacks TruTherm compensation for sub-90nm diodes. | Deployed in legacy systems with older 130/180 nm processors where beta compensation is less critical. | Choose MAX6642AESA+ only if interfacing with non-Intel diodes or where TI supply chain constraints exist - verify accuracy loss in target use case. |
Compared with LM95234CIMM/NOPB, LM95235CIMM/NOPB adds local temperature sensing and dual-channel alarm logic at minimal cost premium; versus MAX6642AESA+, it delivers superior accuracy on modern processors due to TruTherm technology - making it the preferred choice for post-2010 x86 platforms.
Availability
LM95235CIMM/NOPB is available at Aetrix Electronics and suitable for laptop thermal management, desktop workstation cooling, and server blade monitoring requiring stable component supply across multi-year production cycles.
Supply support for LM95235CIMM/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 leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in precision sensing and thermal management ICs.
LM95235CIMM/NOPB belongs to TI's precision temperature sensor product line, designed specifically for high-accuracy remote diode monitoring in commercial computing systems - emphasizing SMBus integration, process-node adaptability, and robust noise immunity.
FAQ
What is the maximum remote diode temperature accuracy of the LM95235CIMM/NOPB under specified conditions?
The LM95235CIMM/NOPB achieves ±0.75°C maximum remote temperature accuracy when measuring a 65 nm Intel processor diode at TA = 25°C to 85°C ambient and TD = 60°C to 100°C diode junction temperature, as guaranteed in the datasheet SNIS142F section "Temperature Accuracy Using Remote Diode." This performance relies on TruTherm compensation and proper D+/D− layout per TI layout guidelines.
Does the LM95235CIMM/NOPB support both signed and unsigned remote temperature formats?
Yes, the LM95235CIMM/NOPB provides simultaneous access to signed (12-bit plus sign) and unsigned (13-bit) remote temperature data in separate registers. With digital filter enabled, resolution is 0.03125°C; with filter disabled, it is 0.125°C. This dual-format capability allows seamless handling of negative temperatures and values above +128°C without firmware sign-extension logic.
Can the LM95235CIMM/NOPB operate in automotive environments?
No - the LM95235CIMM/NOPB is rated for 0°C to +90°C ambient (C-grade), making it suitable for commercial computing only. For automotive use, TI offers the LM95235-Q1 variant, which is AEC-Q100 Grade 3 qualified (−40°C to +85°C) and manufactured on an automotive-grade flow. The LM95235CIMM/NOPB lacks automotive qualification and thermal specifications.
How does the OS/A0 pin function in the LM95235CIMM/NOPB?
In the LM95235CIMM/NOPB, the OS/A0 pin defaults to SMBus address input (A0) after power-up, supporting three addresses (18h, 29h, 4Ch) based on voltage level. It can be reconfigured as an open-drain over-temperature shutdown output (OS), but only when set to High - in which case only address 4Ch remains valid. This dual-role pin reduces pin count while enabling flexible system integration.
What is the purpose of the digital filter in the LM95235CIMM/NOPB remote channel?
The digital filter in the LM95235CIMM/NOPB remote channel suppresses transient noise on the D+/D− lines - common near high-speed CPUs - improving measurement stability and enabling higher resolution (0.03125°C vs. 0.125°C). When enabled, it increases conversion time slightly but significantly reduces false T_CRIT/OS assertions in electrically noisy environments.
LM95235CIMM/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:
- 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
LM95235CIMM/NOPB FAQ
1.How can I place an order for LM95235CIMM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM95235CIMM/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 LM95235CIMM/NOPB reliable?
The price and inventory of LM95235CIMM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM95235CIMM/NOPB is usually 5 days.
3.What payment methods are accepted for LM95235CIMM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM95235CIMM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM95235CIMM/NOPB?
LM95235CIMM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM95235CIMM/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 LM95235CIMM/NOPB?
For technical support, including LM95235CIMM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM95235CIMM/NOPB requirements.
6.How does Aetrix verify that LM95235CIMM/NOPB is sourced from the original manufacturer or authorized distributors?
All LM95235CIMM/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 LM95235CIMM/NOPB meets industry standards.
7.What is the process for return or replacement of LM95235CIMM/NOPB?
All LM95235CIMM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM95235CIMM/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 LM95235CIMM/NOPB part is unused and in its original packaging.
Return procedure for LM95235CIMM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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