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Texas Instruments LM95233CISD/NOPB
- Part No.:
- LM95233CISD/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LM95233CISD/NOPB.pdf
- Description:
- SENSOR DIGITAL -40C-125C 14WSON
- Quantity:
- Payment:
- Shipping:
Inventory:6,723
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Product details
Overview
LM95233CISD/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 LM95233CISD/NOPB datasheet, LM95233CISD/NOPB pinout, LM95233CISD/NOPB application, or LM95233CISD/NOPB equivalent, this page delivers verified technical context, validated pin functions, confirmed thermal accuracy across 65 nm/90 nm processes and MMBT3904 diodes, real-world SMBus timing compliance, and precise TCRIT output behavior under shared hysteresis control.
Technical Context
The LM95233CISD/NOPB integrates a sigma-delta ADC core with programmable digital filters for Remote Diode 1 and 2, enabling 13-bit resolution (0.03125°C LSB) and transient noise clipping. Its TruTherm™ circuitry dynamically compensates for BJT beta variation in sub-micron process thermal diodes, ensuring accurate die temperature tracking without external calibration.
It supports three SMBus slave addresses via A0 pin (18h/2Ah/2Bh), implements per-channel diode model selection (65 nm Intel vs. MMBT3904), and provides independent channel enable/disable control to reduce conversion time and average supply current. All three TCRIT outputs are open-drain, active-low, and share a programmable hysteresis register.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Local Accuracy | ±2.0°C max over −40°C to +125°C ambient; excludes self-heating effects. |
| Remote Accuracy | ±0.875°C max for 65 nm Intel processors at TD = +60°C to +100°C. |
| Supply Voltage | 3.0 V to 3.6 V; requires 0.1 µF + 100 pF bypass capacitors at VDD pin. |
| Resolution | 0.03125°C LSB with digital filter enabled on remote channels; 0.125°C LSB otherwise. |
| Conversion Rate | Programmable from 1 Hz to fastest mode (30–37 ms for local-only conversion). |
| SMBus Compliance | Fully compliant with SMBus 2.0; 100 kHz max clock frequency; tTIMEOUT reset at 25–35 ms low time. |
| Operating Range | −40°C to +125°C ambient (LM95233CISD grade); junction-to-ambient θJA = 63°C/W with 1 thermal via. |
Pinout & Package
LM95233CISD/NOPB uses a 14-pin WSON package (NHL0014B) with exposed thermal pad connected to GND. Pin 1 is NC; pins 1–4 and 13 are no-connect or power/ground tie options; D− serves as common cathode return for both remote diodes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 2) | Positive supply input | 3.0–3.6 V DC; must be bypassed with 0.1 µF + 100 pF capacitors placed adjacent to pin. |
| D− (Pin 5) | Diode return current sink | Common cathode connection for both remote diodes; connects to system ground reference. |
| D2+ (Pin 6) | Remote diode 2 anode current source | Drives current into second remote thermal diode; float if unused. |
| D1+ (Pin 7) | Remote diode 1 anode current source | Drives current into first remote thermal diode; float if unused. |
| GND (Pin 8) | Power supply ground | Low-noise system ground; thermal pad must be soldered to GND plane. |
| A0 (Pin 9) | SMBus address select | Three-level input (GND/mid/VDD) sets slave address to 18h/2Ah/2Bh. |
| TCRIT1–3 (Pins 10,11,14) | Critical temperature outputs | Open-drain, active-low; require external pull-up resistors; share programmable hysteresis. |
| SMBCLK/SMBDAT (Pins 12,13) | SMBus interface lines | Bi-directional clock/data; require external pull-up resistors; support TIMEOUT reset. |
Key Features
| Feature | Design Value |
|---|---|
| TruTherm™ BJT beta compensation | Enables accurate sensing of 65 nm and 90 nm Intel processor thermal diodes without manual offset tuning. |
| Programmable digital filtering | Two-stage filter (standard/enhanced) suppresses noise-induced TCRIT false triggers and improves resolution to 0.03125°C. |
| Per-channel diode model selection | Independent register bits select 65 nm Intel or MMBT3904 models per remote channel for optimal accuracy. |
| Three TCRIT outputs with shared hysteresis | Allows independent critical thresholds per channel while minimizing register overhead and logic complexity. |
| Channel enable/disable control | Reduces conversion time by up to 30% and cuts average supply current when unused remote channels are disabled. |
Applications
| Laptop Thermal Management | Server CPU Monitoring |
|---|---|
|
Use Scenario: Real-time die temperature monitoring of dual-core CPU and integrated GPU in space-constrained laptop chassis. IC Role / Device Role / Timing Role: Dual remote diode sensor with local measurement; interfaces via SMBus to EC/BMC for dynamic fan speed and throttling control. Use Value: ±0.875°C remote accuracy ensures reliable thermal headroom calculation for Intel 65 nm processors, preventing premature throttling. |
Use Scenario: High-accuracy thermal supervision of multi-socket server CPUs with discrete thermal diodes on each socket. IC Role / Device Role / Timing Role: Local + dual remote temperature acquisition; TCRIT2 triggers fan ramp-up, TCRIT1 initiates graceful shutdown. Use Value: Programmable digital filters eliminate false TCRIT events caused by transient voltage spikes on long PCB traces. |
| Workstation Graphics Thermal Control | Industrial Embedded Controller |
|
Use Scenario: Monitoring GPU die temperature and VRM hotspot on high-performance workstation graphics cards. IC Role / Device Role / Timing Role: Remote diode 1 on GPU die, remote diode 2 on VRM MOSFET; local sensor tracks PCB ambient. Use Value: Independent diode model selection allows simultaneous use of Intel 65 nm GPU diode and MMBT3904-based VRM sensor. |
Use Scenario: Compact industrial controller requiring thermal safety for FPGA and power management ICs. IC Role / Device Role / Timing Role: Local sensor monitors controller ambient; remote diodes track FPGA junction and PMIC die temperature. Use Value: Three-level A0 addressing enables stacking of up to three LM95233CISD/NOPB units on one SMBus for multi-zone monitoring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual remote diode temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM95235CISD/NOPB | Same pinout and SMBus interface; adds internal 2.5 V reference and improved remote accuracy (±0.75°C) for 45 nm processes. | Targeted at newer CPU generations; requires updated diode model register configuration. | Select when upgrading from 65 nm to 45 nm or lower process nodes and higher accuracy is required. |
| MAX6642AESA+ | Pin-compatible 8-pin SOIC; single remote + local sensing; ±1.0°C remote accuracy; no TruTherm compensation. | Limited to one remote diode; lacks digital filtering and multi-TCRIT flexibility. | Choose for cost-sensitive, single-diode applications where board space permits SOIC and accuracy requirements are relaxed. |
Compared with LM95233CISD/NOPB, LM95235CISD/NOPB offers enhanced process node support and tighter accuracy but identical integration level, while MAX6642AESA+ trades dual-remote capability and advanced filtering for smaller footprint and lower cost in simpler thermal systems.
Availability
LM95233CISD/NOPB is available at Aetrix Electronics and suitable for laptop thermal management, server CPU monitoring, workstation graphics thermal control, and industrial embedded controller applications requiring stable component supply and long-term lifecycle support.
Supply support for LM95233CISD/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 power management ICs.
The LM95233CISD/NOPB belongs to TI's TruTherm™ temperature sensor product line, designed specifically for accurate die temperature monitoring in high-performance computing, graphics, and embedded systems using sub-micron process thermal diodes.
FAQ
What is the maximum remote diode temperature accuracy of LM95233CISD/NOPB for Intel 65 nm processors?
The LM95233CISD/NOPB achieves ±0.875°C maximum remote diode temperature accuracy for Intel 65 nm processors within the temperature range of +60°C to +100°C, as specified in the official SNIS145E datasheet. This accuracy is enabled by TruTherm™ BJT beta compensation and requires correct diode model selection in the Remote Diode Model Select register. The LM95233CISD/NOPB maintains this performance without external calibration components.
How does the digital filter affect resolution and TCRIT triggering in LM95233CISD/NOPB?
When enabled, the digital filter on LM95233CISD/NOPB increases remote diode temperature resolution from 0.125°C to 0.03125°C (13-bit unsigned) and applies transient noise clipping to suppress false TCRIT events. Filtered readings are used directly for TCRIT comparisons, and two filter levels (standard/enhanced) are selectable per channel via the Filter Setting Register (0Fh). The enhanced filter rejects impulses >4°C while preserving step response fidelity.
Can LM95233CISD/NOPB monitor more than two remote diodes simultaneously?
No, LM95233CISD/NOPB supports exactly two remote diodes (D1+ and D2+) plus its own local temperature sensor. The architecture dedicates separate current sources, digital filters, offset registers, and limit registers to each remote channel. To monitor additional thermal diodes, multiple LM95233CISD/NOPB devices can be connected to the same SMBus using the three-level A0 address pin to assign unique slave addresses (18h, 2Ah, 2Bh).
What is the function of the D− pin on LM95233CISD/NOPB, and how must it be connected?
The D− pin on LM95233CISD/NOPB serves as the common cathode return path for both remote diodes (D1+ and D2+), functioning as a current sink. It must be connected to the same low-noise ground reference used by the remote diode cathodes - typically the system ground plane. The datasheet explicitly states that D− is not internally connected to device GND (Pin 8), so external routing to GND is mandatory for proper remote sensing operation.
Does LM95233CISD/NOPB support SMBus timeout reset, and what is the required timing?
Yes, LM95233CISD/NOPB supports SMBus timeout reset: holding either SMBDAT or SMBCLK low for 25–35 ms resets the internal SMBus state machine and places both lines in high-impedance mode. This feature complies with SMBus 2.0 specifications and provides robust recovery from bus lockup conditions. The exact timeout window is guaranteed between 25 ms (minimum) and 35 ms (maximum), as documented in the SNIS145E datasheet switching characteristics table.
LM95233CISD/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- TruTherm™
- 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)
LM95233CISD/NOPB FAQ
1.How can I place an order for LM95233CISD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM95233CISD/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 LM95233CISD/NOPB reliable?
The price and inventory of LM95233CISD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM95233CISD/NOPB is usually 5 days.
3.What payment methods are accepted for LM95233CISD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM95233CISD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM95233CISD/NOPB?
LM95233CISD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM95233CISD/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 LM95233CISD/NOPB?
For technical support, including LM95233CISD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM95233CISD/NOPB requirements.
6.How does Aetrix verify that LM95233CISD/NOPB is sourced from the original manufacturer or authorized distributors?
All LM95233CISD/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 LM95233CISD/NOPB meets industry standards.
7.What is the process for return or replacement of LM95233CISD/NOPB?
All LM95233CISD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM95233CISD/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 LM95233CISD/NOPB part is unused and in its original packaging.
Return procedure for LM95233CISD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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