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Texas Instruments LM95233CISDX/NOPB
- Part No.:
- LM95233CISDX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LM95233CISDX/NOPB.pdf
- Description:
- SENSOR DIGITAL -40C-125C 14WSON
- Quantity:
- Payment:
- Shipping:
Inventory:4,500
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Product details
Overview
LM95233CISDX/NOPB from Texas Instruments is a dual remote diode and local digital temperature sensor with SMBus 2.0 interface, TruTherm™ BJT beta compensation, ±0.875°C remote diode accuracy (65 nm Intel processor), 0.03125°C resolution with digital filter enabled, and three programmable TCRIT outputs. It monitors CPU/GPU die temperature and local PCB temperature in high-density computing systems.
For engineers reviewing the LM95233CISDX/NOPB datasheet, LM95233CISDX/NOPB pinout, LM95233CISDX/NOPB application, or LM95233CISDX/NOPB equivalent, key selection considerations include remote diode model support (65 nm Intel/2N3904), SMBus address configurability via A0 pin, thermal fault detection capability, and 14-pin WSON package thermal performance under forced airflow.
Technical Context
The LM95233CISDX/NOPB integrates a sigma-delta ADC core with programmable digital filters per remote channel, enabling 13-bit resolution (0.03125°C) when filtering is active. Its TruTherm™ technology dynamically compensates for BJT beta variation across process nodes, ensuring accurate sensing of sub-micron thermal diodes without external calibration.
It implements three open-drain TCRIT outputs with shared hysteresis and independent masking, each triggered by programmable limits on local, remote 1, or remote 2 channels. The device supports one-shot conversion control, shutdown mode, and per-channel enable/disable to optimize power in multi-sensor thermal management systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Local Accuracy | ±2.0°C max over −40°C to +125°C - ensures reliable board-level thermal monitoring without self-heating correction |
| Remote Accuracy | ±0.875°C max for 65 nm Intel processors - enables precise CPU die temperature tracking for dynamic thermal throttling |
| Supply Voltage | 3.0 V to 3.6 V - compatible with standard 3.3 V system rails and bypassed using 0.1 µF + 100 pF capacitors |
| Resolution | 0.03125°C with digital filter enabled - improves noise immunity and reduces false TCRIT assertions in electrically noisy environments |
| Conversion Rate | Programmable from 1 Hz to fastest mode (30–37 ms for local-only) - balances update latency and average supply current (0.57 mA typ at 1 Hz) |
| SMBus Address | Three options via A0 pin (18h/2Ah/2Bh) - allows up to three LM95233CISDX/NOPB devices on same bus without address conflict |
| Operating Range | −40°C to +140°C ambient - supports industrial and server-grade thermal environments with junction-to-ambient θJA = 31°C/W (6 vias + airflow) |
Pinout & Package
LM95233CISDX/NOPB uses a 14-pin WSON (4 mm × 4 mm, 0.65 mm pitch) package with exposed thermal pad connected to GND. Pin count and layout match NHL0014B mechanical specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 2) | Positive supply input | Must be decoupled with 0.1 µF + 100 pF capacitors; noise <200 mVp-p; 3.0–3.6 V operation only |
| GND (Pin 8) | Power ground reference | Low-noise return path; thermal pad must be soldered to GND plane for thermal performance |
| SMBCLK (Pin 13) | SMBus clock input | Open-drain-compatible; requires external pull-up; supports 10–100 kHz SMBus 2.0 timing |
| SMBDAT (Pin 12) | SMBus bidirectional data | Open-drain; requires external pull-up; VOL ≤0.4 V at 6 mA sink current |
| D− (Pin 5) | Common diode cathode return | Sinks current from both remote diodes; connects to cathodes of D1+ and D2+ diodes |
| D1+ (Pin 9) | Remote diode 1 anode drive | 160–230 µA current source; floats if channel disabled; optional 100 pF cap to D− improves noise immunity |
| D2+ (Pin 6) | Remote diode 2 anode drive | Identical sourcing to D1+; independent model selection and offset registers per channel |
| TCRIT1–3 (Pins 4,10,14) | Active-low critical temp outputs | Open-drain; require pull-ups; trigger on unmasked limit exceedance; status readable via SMBus |
| A0 (Pin 9) | Address select input | Three-level logic (GND/mid/VDD) sets SMBus address to 18h/2Ah/2Bh; no floating allowed |
Key Features
| Feature | Design Value |
|---|---|
| TruTherm™ BJT beta compensation | Enables accurate remote sensing of 65 nm and 90 nm Intel processor thermal diodes without external calibration |
| Programmable digital filters | Two-stage filtering per remote channel suppresses transient noise and increases resolution to 0.03125°C |
| Diode fault detection | Identifies D+ short-to-rail, open-circuit, or floating conditions - prevents erroneous temperature reporting |
| Three independent TCRIT outputs | Each configurable to any channel limit with shared hysteresis and individual mask registers for flexible system shutdown/fan control |
| Per-channel enable/disable | Reduces conversion time and average supply current by disabling unused remote or local sensing paths |
Applications
| Laptop CPU Thermal Management | Server GPU Monitoring |
|---|---|
Use Scenario: Real-time die temperature monitoring of dual-core mobile CPUs during burst workloads. IC Role / Device Role / Timing Role: Dual remote diode sensor interfaces directly to CPU-integrated thermal diode and local PCB sensor. Use Value: Enables dynamic frequency scaling and fan speed control using ±0.875°C remote accuracy and 0.03125°C filtered resolution. | Use Scenario: Concurrent thermal supervision of discrete graphics processor and VRM on high-performance server blade. IC Role / Device Role / Timing Role: Remote 1 senses GPU die via integrated diode; Remote 2 monitors VRM MOSFET junction; Local reads heatsink base. Use Value: Three TCRIT outputs independently trigger GPU throttling, VRM shutdown, and chassis fan ramp-up based on validated thresholds. |
| Workstation Memory Module Thermal Control | Industrial Embedded Controller Thermal Safety |
Use Scenario: Temperature validation of DDR4 DIMM modules with on-die thermal sensors in multi-socket workstations. IC Role / Device Role / Timing Role: Remote 1 configured for MMBT3904 diode-connected transistor on memory module; Local monitors controller SoC. Use Value: Diode model selection register ensures ±1.1°C accuracy for discrete transistor diodes; SMBus address flexibility supports per-module sensor mapping. | Use Scenario: Fail-safe thermal protection in fanless industrial PLCs operating at −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Local sensor monitors controller junction; Remote 1 tracks heatsink; TCRIT2 drives hardware reset circuit. Use Value: Shutdown mode reduces quiescent current to 360 µA; −40°C to +140°C operating range ensures reliability in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual remote/local temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM95235CISDX/NOPB | Same architecture but adds internal 2.5 V reference and improved remote accuracy (±0.75°C for 65 nm Intel); identical pinout and SMBus protocol | Preferred for new designs requiring tighter remote tolerance; supports same thermal diode models and filter modes | Select LM95235CISDX/NOPB when higher remote accuracy is required and 2.5 V reference integration simplifies system BOM |
| MAX6642AESA+ | 2-wire SMBus interface, dual remote + local sensing, but lacks TruTherm™ compensation; ±1.5°C remote accuracy for generic diodes | Suitable for non-Intel platforms or legacy diode types where beta compensation is unnecessary | Choose MAX6642AESA+ for cost-sensitive applications with standard 2N3904-based thermal diodes and no sub-micron process requirement |
Compared with LM95233CISDX/NOPB, LM95235CISDX/NOPB delivers enhanced remote accuracy and integrated reference without layout changes, while MAX6642AESA+ offers SMBus compatibility at lower precision for general-purpose thermal monitoring where TruTherm™ is not needed.
Availability
LM95233CISDX/NOPB is available at Aetrix Electronics and suitable for laptop thermal management, server GPU monitoring, and industrial embedded controller applications requiring stable component supply and long-term lifecycle support.
Supply support for LM95233CISDX/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 company specializing in analog and embedded processing technologies, with leadership in precision sensing, power management, and interface solutions.
The LM95233CISDX/NOPB belongs to TI's TruTherm™ temperature sensor product line, designed specifically for high-accuracy thermal monitoring of modern microprocessors, GPUs, and FPGAs using sub-micron process thermal diodes.
FAQ
What is the maximum remote diode temperature accuracy of the LM95233CISDX/NOPB?
The LM95233CISDX/NOPB achieves ±0.875°C maximum remote diode temperature accuracy when sensing 65 nm Intel processor thermal diodes at TA = +25°C to +85°C and TD = +60°C to +100°C. This specification is validated per the LM95233CISDX/NOPB datasheet SNIS145E and applies only with TruTherm™ BJT beta compensation enabled and correct diode model selection.
Does the LM95233CISDX/NOPB support multiple devices on the same SMBus?
Yes, the LM95233CISDX/NOPB supports up to three devices on a single SMBus through its three-level A0 address pin, which configures slave addresses 18h, 2Ah, or 2Bh. Each LM95233CISDX/NOPB must have a unique A0 voltage level (GND, mid-supply, or VDD) to avoid address collision during SMBus communication.
How does the digital filter affect resolution and response time in the LM95233CISDX/NOPB?
When enabled, the LM95233CISDX/NOPB digital filter increases remote diode resolution from 0.125°C to 0.03125°C (13-bit unsigned) but introduces step-response delay - e.g., Figure 11 shows ~17-sample settling for a 17°C step. Filter settings are per-channel (R1F/R2F bits) and impact TCRIT assertion timing; unfiltered mode provides faster reaction to rapid thermal transients.
What thermal diode models does the LM95233CISDX/NOPB support?
The LM95233CISDX/NOPB supports two primary remote diode models via configuration registers: 65 nm Intel processor thermal diodes and MMBT3904/2N3904 diode-connected transistors. Each remote channel (D1+, D2+) has independent model selection and offset correction registers, allowing mixed-model configurations - e.g., Remote 1 for CPU, Remote 2 for discrete transistor on DIMM.
What is the operating temperature range and thermal resistance of the LM95233CISDX/NOPB package?
The LM95233CISDX/NOPB operates from −40°C to +140°C ambient. In a 4-layer PCB with six thermal vias and 900 LFPM airflow, its WSON package achieves θJA = 31°C/W. Without vias or airflow, θJA rises to 90°C/W - design must ensure junction temperature remains within −40°C to +140°C under worst-case power dissipation (max 4.3 mW at 3.6 V).
LM95233CISDX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- TruTherm™
- Package/Case:
- 14-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Sensor Type:
- Digital, Local/Remote
- Sensing Temperature - Local:
- -40°C ~ 125°C
- Sensing Temperature - Remote:
- -40°C ~ 125°C
- Output Type:
- SMBus
- Voltage - Supply:
- 3V ~ 3.6V
- Resolution:
- 10 b
- Features:
- One-Shot, Output Switch, Programmable Limit, Shutdown Mode, Standby Mode
- Accuracy - Highest (Lowest):
- ±2°C
- Test Condition:
- -40°C ~ 125°C
- Operating Temperature:
- -40°C ~ 140°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 14-WSON (4x4)
LM95233CISDX/NOPB FAQ
1.How can I place an order for LM95233CISDX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM95233CISDX/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 LM95233CISDX/NOPB reliable?
The price and inventory of LM95233CISDX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM95233CISDX/NOPB is usually 5 days.
3.What payment methods are accepted for LM95233CISDX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM95233CISDX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM95233CISDX/NOPB?
LM95233CISDX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM95233CISDX/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 LM95233CISDX/NOPB?
For technical support, including LM95233CISDX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM95233CISDX/NOPB requirements.
6.How does Aetrix verify that LM95233CISDX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM95233CISDX/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 LM95233CISDX/NOPB meets industry standards.
7.What is the process for return or replacement of LM95233CISDX/NOPB?
All LM95233CISDX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM95233CISDX/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 LM95233CISDX/NOPB part is unused and in its original packaging.
Return procedure for LM95233CISDX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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