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Texas Instruments LM95214CISD/NOPB
- Part No.:
- LM95214CISD/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LM95214CISD/NOPB.pdf
- Description:
- SENSOR DIGITAL -40C-125C 14WSON
- Quantity:
- Payment:
- Shipping:
Inventory:544
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Product details
Overview
LM95214CISD/NOPB from Texas Instruments is a quad remote diode and local temperature sensor IC with SMBus 2.0 interface, delivering ±1.1°C remote diode accuracy (MMBT3904), ±2.0°C local accuracy, 0.03125°C resolution on filtered channels, and three programmable TCRIT outputs for thermal fault response in CPU/GPU/FPGA monitoring systems.
For engineers reviewing the LM95214CISD/NOPB datasheet, LM95214CISD/NOPB pinout, LM95214CISD/NOPB application, or LM95214CISD/NOPB equivalent, key selection criteria include remote diode model support (2N3904/MMBT3904), digital filter enablement on channels 1–2, shared hysteresis across TCRIT outputs, SMBus address select via A0 pin, and WSON-14 package compatibility with high-density thermal management layouts.
Technical Context
The LM95214CISD/NOPB integrates a sigma-delta ADC core with per-channel analog front-end filtering and programmable digital filters on remote channels 1 and 2-enabling 13-bit resolution (0.03125°C LSB) when enabled. It supports two temperature formats: signed (+127.875°C/–128°C) and unsigned (0°C/255°C), with dedicated offset registers per remote channel for diode non-ideality compensation.
Its SMBus 2.0 interface operates at 10–100 kHz with TIMEOUT support and uses a three-level A0 pin to configure one of three slave addresses (18h, 4Dh, 4Eh). The device implements a round-robin conversion sequence (~190 ms full-channel cycle), with independent channel enable/disable, shutdown mode (360 µA), and one-shot trigger capability for precise timing control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Remote Accuracy | ±1.1°C max (TA = +25°C to +85°C, TD = +60°C to +100°C, MMBT3904 diode) |
| Local Accuracy | ±2.0°C max (–40°C to +125°C, excludes self-heating) |
| Resolution | 0.03125°C LSB with digital filter enabled on remote channels 1 & 2 |
| Supply Voltage | 3.0 V to 3.6 V - requires 0.1-µF + 100-pF bypassing at VDD |
| Quiescent Current | 570 µA typical at 1-Hz conversion rate, 360 µA in shutdown mode |
| Conversion Time | 30–34 ms (local only), 1100–1210 ms (all 5 channels enabled) |
| SMBus Interface | 2-wire, slave-only, no clock stretching, TIMEOUT-compliant, 10–100 kHz |
Pinout & Package
LM95214CISD/NOPB is housed in a 4.00 mm × 4.00 mm WSON-14 (NHL) package with wettable flanks, optimized for thermal performance (RθJA = 38.7°C/W) and automated optical inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connect | Unbonded; may float, tie to GND, or tie to VDD - no electrical function |
| 2 (VDD) | Positive Supply Input | 3.0–3.6 V power rail; requires dual-capacitor bypass (0.1 µF || 100 pF) adjacent to pin |
| 3 (D4+) | Remote Diode 4 Anode Driver | Current source (160–230 µA) for fourth external diode-connected transistor junction |
| 4 (D3+) | Remote Diode 3 Anode Driver | Current source for third remote diode; supports fault-queue-based TCRIT3 masking |
| 5 (D−) | Common Diode Cathode Return | Shared sink node for all four remote diodes; must be connected to system ground reference |
| 6 (D2+) | Remote Diode 2 Anode Driver | Current source with programmable digital filter; enables 0.03125°C resolution |
| 7 (D1+) | Remote Diode 1 Anode Driver | Current source with programmable digital filter; supports offset calibration register |
| 8 (GND) | Power Ground | Low-noise system ground reference; separate from noisy digital or power grounds |
| 9 (A0) | Address Select Input | Three-state logic input (VDD/GND/mid-supply) to set SMBus slave address (18h/4Dh/4Eh) |
| 10 (TCRIT1) | Critical Temp Output 1 | Open-drain active-low output triggered by unmasked channel exceeding limit; pullup required |
| 11 (TCRIT2) | Critical Temp Output 2 | Open-drain active-low output with shared hysteresis; masks independently per channel |
| 12 (SMBDAT) | SMBus Bidirectional Data | Open-drain data line; requires external pullup; supports TIMEOUT and standard SMBus protocols |
| 13 (SMBCLK) | SMBus Clock Input | Asynchronous clock input from master; no clock stretching supported |
| 14 (TCRIT3) | Critical Temp Output 3 | Open-drain active-low output sharing TCRIT2 limits but with independent mask register |
Key Features
| Feature | Design Value |
|---|---|
| Dual-format temperature reporting | Signed (+127.875°C/–128°C) and unsigned (0°C/255°C) modes selectable per channel for flexible system integration |
| Per-channel diode model selection | Configurable ideality factor and offset registers per remote channel to match MMBT3904, 2N3904, or custom diodes |
| Programmable digital filtering | Enables 13-bit resolution (0.03125°C) on remote channels 1 and 2 while suppressing noise-induced false TCRIT triggers |
| Fault-queue architecture | Prevents spurious TCRIT activation on remote channels 3 and 4 during transient spikes using multi-sample validation logic |
| Three independent TCRIT outputs | TCRIT1/TCRIT2/TCRIT3 provide hardware-level thermal interrupt signaling with shared hysteresis and per-output masking |
| Channel-level power control | Individual enable/disable bits allow disabling unused remote channels to reduce conversion time and average supply current |
Applications
| Server CPU Thermal Monitoring | GPU Die Temperature Control |
|---|---|
|
Use Scenario: Real-time die temperature tracking of dual-socket Xeon processors in 1U rack servers with fan speed modulation and throttling. IC Role / Device Role / Timing Role: Local sensor monitors ambient PCB temperature; remote channels 1–4 track individual CPU cores and VRM hotspots via on-die thermal diodes. Use Value: Enables dynamic fan control with ±1.1°C remote accuracy and 0.03125°C resolution on critical cores, reducing acoustic noise while maintaining <100°C junction limits. |
Use Scenario: Closed-loop thermal management of NVIDIA A100 GPU modules in AI inference servers, where localized hotspots exceed 110°C. IC Role / Device Role / Timing Role: Remote channel 1 monitors GPU die via integrated diode; TCRIT1 triggers immediate fan ramp-up at 110°C threshold with 2°C hysteresis. Use Value: Prevents GPU thermal throttling during sustained compute loads by delivering sub-0.1°C resolution feedback to BMC firmware every 190 ms. |
| FPGA-Based Medical Imaging System | Cloud Ethernet Switch ASIC Thermal Protection |
|
Use Scenario: Thermal supervision of Xilinx Ultrascale+ FPGA and companion ADC/DACs in portable ultrasound equipment requiring FDA compliance. IC Role / Device Role / Timing Role: LM95214CISD/NOPB remote channels monitor FPGA junction, power ICs, and analog front-end; local sensor validates board-level ambient drift. Use Value: Meets IEC 60601-1 thermal safety requirements via redundant TCRIT2/TCRIT3 outputs that force safe shutdown if any channel exceeds 85°C. |
Use Scenario: Multi-point thermal monitoring of Broadcom Tomahawk 4 switch ASICs and SerDes lanes in 25G/100G cloud switches operating at 70°C ambient. IC Role / Device Role / Timing Role: Remote channels 2–4 track ASIC corners and voltage regulators; TCRIT3 signals BMC to throttle packet forwarding when remote 4 exceeds 110°C. Use Value: Maintains link stability under burst traffic by detecting localized ASIC heating before BER degradation occurs, using fault-queue filtering to ignore EMI-induced spikes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad remote diode temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6642AESA+ | ±2.0°C remote accuracy (worse than LM95214CISD/NOPB's ±1.1°C); single TCRIT output; no digital filter; 8-pin SOIC package | Limited to dual-diode monitoring; lacks per-channel masking and fault-queue logic for noisy environments | Select for cost-sensitive, lower-accuracy applications where only two remote points require monitoring and SMBus address flexibility is not needed. |
| ADT7481ARMZ-REEL | ±1.5°C remote accuracy; dual TCRIT outputs; supports SMBus Alert Response Address; 16-pin QSOP package | Supports Alert Response Protocol for multi-device interrupt arbitration; lacks dedicated fault-queue for remote channels 3–4 | Choose when integrating into SMBus Alert-capable systems with mixed thermal sensors and need deterministic interrupt prioritization. |
Compared with MAX6642AESA+ and ADT7481ARMZ-REEL, the LM95214CISD/NOPB uniquely delivers higher remote accuracy (±1.1°C), three independent TCRIT outputs with shared hysteresis, and fault-queue logic on two remote channels-making it optimal for high-reliability server, GPU, and FPGA thermal management where false alarms must be minimized.
Availability
LM95214CISD/NOPB is available at Aetrix Electronics and suitable for server motherboard design, GPU thermal subsystems, FPGA-based medical imaging platforms, and cloud Ethernet switch development requiring stable component supply and long-term industrial lifecycle support.
Supply support for LM95214CISD/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 over 50 years of innovation in precision sensing, power management, and interface solutions.
The LM95214CISD/NOPB belongs to TI's high-accuracy thermal monitoring product line, designed specifically for multi-point die temperature supervision in CPUs, GPUs, FPGAs, and ASICs where sub-degree resolution and robust noise immunity are mandatory.
FAQ
What is the maximum remote diode temperature measurement range supported by the LM95214CISD/NOPB?
The LM95214CISD/NOPB supports two remote temperature ranges: a signed format spanning –128°C to +127.875°C and an unsigned format spanning 0°C to 255°C. Both ranges are accessible via register configuration, with accuracy specified up to +140°C for remote diodes using an MMBT3904 model. The device maintains ±1.1°C accuracy from +60°C to +100°C and ±3.3°C at +140°C under defined test conditions.
How does the digital filter on LM95214CISD/NOPB improve thermal monitoring reliability?
The digital filter on LM95214CISD/NOPB is applied exclusively to remote channels 1 and 2 and increases resolution to 0.03125°C while suppressing noise-induced errors. It operates by oversampling and averaging multiple conversions, effectively rejecting high-frequency interference from switching regulators or RF sources. This prevents false TCRIT assertions during transient events without increasing conversion latency beyond the base 190-ms round-robin cycle.
Can LM95214CISD/NOPB monitor more than four remote diodes simultaneously?
No, the LM95214CISD/NOPB is architecturally limited to four remote diode inputs (D1+ through D4+) plus its internal local sensor. Each remote channel has dedicated current-source drivers, offset registers, and fault detection circuitry. To monitor additional diodes, multiple LM95214CISD/NOPB devices must be used on the same SMBus bus-enabled by the three-level A0 pin supporting up to three unique slave addresses (18h, 4Dh, 4Eh).
What is the purpose of the D− pin on the LM95214CISD/NOPB and how should it be connected?
The D− pin on LM95214CISD/NOPB serves as the common cathode return path for all four remote diodes. It must be connected directly to the system's low-noise analog ground plane-not digital ground or power ground-to ensure accurate delta-VBE measurement. Floating or incorrect grounding of D− introduces measurement offset and compromises remote accuracy, especially at elevated temperatures where leakage currents increase.
Does LM95214CISD/NOPB support SMBus Alert Response Address (ARA) functionality?
No, the LM95214CISD/NOPB does not implement SMBus Alert Response Address (ARA) protocol. It operates strictly as a standard SMBus 2.0 slave device with fixed 7-bit addressing determined by the A0 pin state. Interrupt signaling is handled exclusively through its three open-drain TCRIT outputs (TCRIT1–TCRIT3), which require external pullup resistors and are read back via status registers-not through SMBus Alert messaging.
LM95214CISD/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)
LM95214CISD/NOPB FAQ
1.How can I place an order for LM95214CISD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM95214CISD/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 LM95214CISD/NOPB reliable?
The price and inventory of LM95214CISD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM95214CISD/NOPB is usually 5 days.
3.What payment methods are accepted for LM95214CISD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM95214CISD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM95214CISD/NOPB?
LM95214CISD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM95214CISD/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 LM95214CISD/NOPB?
For technical support, including LM95214CISD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM95214CISD/NOPB requirements.
6.How does Aetrix verify that LM95214CISD/NOPB is sourced from the original manufacturer or authorized distributors?
All LM95214CISD/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 LM95214CISD/NOPB meets industry standards.
7.What is the process for return or replacement of LM95214CISD/NOPB?
All LM95214CISD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM95214CISD/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 LM95214CISD/NOPB part is unused and in its original packaging.
Return procedure for LM95214CISD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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