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Texas Instruments LM95213CISDX/NOPB
- Part No.:
- LM95213CISDX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LM95213CISDX/NOPB.pdf
- Description:
- SENSOR DIGITAL -40C-125C 14WSON
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM95213CISDX/NOPB from Texas Instruments is an 11-bit digital temperature sensor with SMBus 2.0 interface, monitoring local die temperature and two remote diode junctions (e.g., microprocessor or GPU thermal diodes) with ±2.0°C local and ±1.1°C remote accuracy over −40°C to +125°C. It delivers 0.125°C local resolution and 0.03125°C remote resolution with digital filtering enabled, and drives three open-drain TCRIT outputs for thermal shutdown or fan control in laptop and server thermal management systems.
For engineers reviewing the LM95213CISDX/NOPB datasheet, LM95213CISDX/NOPB pinout, LM95213CISDX/NOPB application, or LM95213CISDX/NOPB equivalent, this page provides verified technical context, validated pin functions, confirmed remote diode calibration capability, real-world SMBus timing compliance, and documented TCRIT hysteresis behavior - all specific to the LM95213CISDX/NOPB WSON-14 package.
Technical Context
The LM95213CISDX/NOPB implements a sigma-delta ADC core with programmable digital filters per remote channel, enabling noise-immune 13-bit remote temperature conversion (0.03125°C LSB) when filters are active. Its dual-diode sensing architecture supports independent offset correction registers for D1+ and D2+, allowing accurate calibration with non-MM3904 diodes such as processor-integrated thermal diodes.
Three TCRIT outputs (TCRIT1–TCRIT3) share a programmable hysteresis register but support individual masking and limit assignment across local and remote channels; TCRIT1 defaults to +110°C on local/remote 1/2, while TCRIT2/TCRIT3 default to +85°C with independent mask control. The device uses a three-level A0 address pin to support up to three units on one SMBus segment without collision.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Local Temp Accuracy | ±2.0°C max over −40°C to +125°C - ensures reliable CPU/GPU junction temperature tracking without system-level recalibration |
| Remote Diode Accuracy | ±1.1°C max (MMBT3904, +25°C to +85°C) - enables precise thermal margining for discrete graphics processors |
| Supply Voltage | 3.0 V to 3.6 V - compatible with standard 3.3 V logic rails and low-noise LDOs |
| Resolution (Local) | 0.125°C LSB (11-bit signed) - sufficient for fine-grained thermal throttling decisions in embedded controllers |
| Resolution (Remote, Filter On) | 0.03125°C LSB (13-bit unsigned) - suppresses transient-induced false TCRIT triggers in noisy PCB environments |
| SMBus Clock Frequency | 10 kHz to 100 kHz - supports standard system management bus timing without custom clock generation |
| Conversion Time (All Channels) | 1210 ms max - deterministic update interval for synchronized thermal policy execution |
Pinout & Package
LM95213CISDX/NOPB is housed in a 14-pin WSON package (NHL0014B), 3.0 mm × 4.0 mm, 0.65 mm pitch, exposed thermal pad, RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 2) | Positive supply input | Must be bypassed with 0.1 µF + 100 pF capacitors; noise <200 mVp-p; powers internal analog/digital blocks |
| GND (Pin 8) | Power ground reference | Low-noise return path for diode current sources and ADC reference; connects to system ground plane |
| D− (Pin 5) | Common diode cathode sink | Shared return for both remote diodes; must connect to cathodes of D1+ and D2+ diodes |
| D1+ (Pin 7) | Remote diode 1 anode current source | Drives bias current into first external thermal diode (e.g., CPU die); float if unused |
| D2+ (Pin 6) | Remote diode 2 anode current source | Drives bias current into second thermal diode (e.g., GPU or VRM controller); float if unused |
| SMBCLK (Pin 13) | SMBus clock input | Asynchronous master-controlled timing signal; requires external pull-up; no clock stretching supported |
| SMBDAT (Pin 12) | SMBus bidirectional data line | Open-drain I/O; requires external pull-up; transmits temperature values, status, and configuration registers |
| TCRIT1–TCRIT3 (Pins 4, 10, 14) | Active-low critical temperature outputs | Open-drain outputs triggered by unmasked channel limit exceedance; require pull-up resistors; drive fan enable or MCU interrupt lines |
| A0 (Pin 9) | SMBus slave address select | Three-state input (GND/mid/VDD) sets address to 18h/2Ah/2Bh - enables multi-drop SMBus topology |
Key Features
| Feature | Design Value |
|---|---|
| Programmable digital filter per remote channel | Enables 0.03125°C resolution and transient noise clipping - prevents false thermal shutdown during voltage spikes |
| Independent remote diode offset correction | Two dedicated offset registers (D1+/D2+) allow calibration for non-ideal diodes (e.g., integrated IC junctions), improving accuracy beyond MMBT3904 baseline |
| Three configurable TCRIT outputs with shared hysteresis | Supports hierarchical thermal response: TCRIT1 for emergency shutdown (+110°C), TCRIT2/TCRIT3 for staged fan ramp (+85°C) with independent masking |
| Diode fault detection circuitry | Detects D+ short-to-rail, floating, or open-circuit conditions - reports via Status Register 1 to prevent erroneous temperature interpretation |
| One-shot conversion in shutdown mode | Allows on-demand temperature reads without continuous power draw - reduces average current to 360 µA in standby |
Applications
| Laptop CPU/GPU Thermal Monitoring | Server DIMM Slot Temperature Control |
|---|---|
Use Scenario: Real-time die temperature tracking of dual-core CPU and discrete GPU on a compact mobile motherboard. IC Role / Device Role / Timing Role: Local sensor measures SoC junction temperature; D1+/D2+ monitor GPU and CPU thermal diodes via SMBus polling every 500 ms. Use Value: Enables dynamic frequency scaling and fan speed modulation with ±1.1°C remote accuracy, preventing thermal throttling before performance degradation occurs. |
Use Scenario: Per-slot memory module temperature supervision in a 2U rack server with 24 DIMM slots. IC Role / Device Role / Timing Role: One LM95213CISDX/NOPB per memory riser card monitors local PCB temp and two adjacent DDR4 modules via discrete 2N3904 diodes. Use Value: TCRIT2 output triggers localized airflow increase when any DIMM exceeds 85°C, extending module lifetime without full-system fan ramp. |
| Industrial PLC Processor Thermal Safety | Network Switch ASIC Junction Sensing |
Use Scenario: Fail-safe thermal protection for ARM-based programmable logic controller operating in −40°C to +85°C ambient. IC Role / Device Role / Timing Role: LM95213CISDX/NOPB local sensor tracks processor die; D1+ monitors power management IC; TCRIT1 drives hardware reset at +110°C. Use Value: Hardware-level shutdown independent of firmware - meets IEC 61508 SIL-2 thermal safety requirements. |
Use Scenario: High-precision junction temperature feedback for 100G Ethernet switch ASIC with integrated thermal diode. IC Role / Device Role / Timing Role: D1+ connected directly to ASIC's thermal diode; digital filter enabled to reject switching noise; SMBus updates every 250 ms. Use Value: 0.03125°C resolution enables sub-degree thermal margining for SerDes lane retiming, reducing bit error rate drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-diode temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM95233CISDX/NOPB | Same WSON-14 package; adds third remote diode channel and extended −55°C to +150°C range; higher quiescent current (0.7 mA) | Required for triple-thermal-zone systems (e.g., CPU + GPU + VRM); not drop-in - requires firmware register map update | Select when monitoring >2 thermal zones or needing extended low-temp operation; retains same SMBus protocol and pinout. |
| MAX6642AESA+ | 8-pin SOIC; single remote diode + local; ±1.5°C remote accuracy; no digital filter; only one TCRIT output | Suitable for cost-sensitive single-processor designs; lacks dual-remote capability and noise-suppression filtering | Choose for simpler thermal monitoring where dual-diode redundancy or transient immunity is unnecessary. |
Compared with LM95233CISDX/NOPB, the LM95213CISDX/NOPB offers lower power and smaller footprint for dual-zone systems, while MAX6642AESA+ trades channel count and filtering for reduced cost and board space - making LM95213CISDX/NOPB optimal for balanced performance in laptop/server thermal subsystems.
Availability
LM95213CISDX/NOPB is available at Aetrix Electronics and suitable for laptop thermal management, server DIMM slot monitoring, and industrial PLC processor safety applications requiring stable component supply and long-term lifecycle support.
Supply support for LM95213CISDX/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 and embedded processing technologies, with decades of expertise in precision sensing and system management ICs.
The LM95213CISDX/NOPB belongs to TI's high-accuracy thermal sensor product line, designed specifically for multi-point thermal monitoring in space-constrained computing platforms where SMBus integration and diode fault resilience are critical.
FAQ
What is the operating temperature range of the LM95213CISDX/NOPB?
The LM95213CISDX/NOPB operates from −40°C to +140°C ambient, with guaranteed electrical performance over −40°C to +125°C. Its local temperature sensor is specified for ±2.0°C accuracy across that full range, and remote diode accuracy holds ±1.1°C from +25°C to +85°C using an MMBT3904 diode. This makes LM95213CISDX/NOPB suitable for demanding thermal environments in laptops, servers, and industrial controllers.
Does the LM95213CISDX/NOPB support SMBus 2.0 timeout functionality?
Yes, the LM95213CISDX/NOPB fully complies with SMBus 2.0 specifications, including timeout detection: holding SMBDAT or SMBCLK low for longer than 25 ms (min) resets the internal state machine and places SMBDAT in high-impedance mode. This feature ensures robust bus recovery after communication faults - a key reliability requirement in mission-critical thermal management systems using LM95213CISDX/NOPB.
How does the digital filter affect remote temperature resolution in the LM95213CISDX/NOPB?
When the digital filter is enabled on either remote channel, the LM95213CISDX/NOPB increases remote temperature resolution from 0.125°C (11-bit) to 0.03125°C (13-bit), while also suppressing transient noise that could falsely trigger TCRIT outputs. This enhanced resolution is achieved without external components and is reflected in the temperature value registers - a verified behavior documented in the LM95213CISDX/NOPB datasheet Figure 7 and Table 4.
Can the LM95213CISDX/NOPB measure temperature using diodes other than MMBT3904?
Yes, the LM95213CISDX/NOPB includes dedicated offset correction registers for both D1+ and D2+ channels, enabling calibration for non-ideal diodes such as integrated thermal junctions in CPUs, GPUs, or PMICs. The datasheet confirms this capability under "Offset Correction" and "Diode Non-Ideality" sections, and specifies accuracy limits apply only when using MMBT3904 - meaning LM95213CISDX/NOPB supports broader diode compatibility via software calibration.
What is the function of the A0 pin on the LM95213CISDX/NOPB?
The A0 pin on the LM95213CISDX/NOPB is a three-state digital input that selects one of three SMBus slave addresses: 18h (A0 = GND), 2Ah (A0 = mid-supply), or 2Bh (A0 = VDD). This allows up to three LM95213CISDX/NOPB devices to coexist on the same SMBus segment without address conflict - a verified feature used in multi-processor thermal architectures and confirmed in the LM95213CISDX/NOPB pin description table and functional description section.
LM95213CISDX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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)
LM95213CISDX/NOPB FAQ
1.How can I place an order for LM95213CISDX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM95213CISDX/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 LM95213CISDX/NOPB reliable?
The price and inventory of LM95213CISDX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM95213CISDX/NOPB is usually 5 days.
3.What payment methods are accepted for LM95213CISDX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM95213CISDX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM95213CISDX/NOPB?
LM95213CISDX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM95213CISDX/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 LM95213CISDX/NOPB?
For technical support, including LM95213CISDX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM95213CISDX/NOPB requirements.
6.How does Aetrix verify that LM95213CISDX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM95213CISDX/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 LM95213CISDX/NOPB meets industry standards.
7.What is the process for return or replacement of LM95213CISDX/NOPB?
All LM95213CISDX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM95213CISDX/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 LM95213CISDX/NOPB part is unused and in its original packaging.
Return procedure for LM95213CISDX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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