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Texas Instruments LM96194CISQX
- Part No.:
- LM96194CISQX
- Manufacturer:
- Texas Instruments
- Category:
- Thermal Management
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
LM96194CISQX.pdf
- Description:
- IC TRUTHERM HDWR MONITOR 48WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,921
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Product details
Overview
LM96194CISQX from Texas Instruments is a TruTherm™ hardware monitor IC for workstation/server thermal and power management, featuring 4 remote thermal diode inputs, 9 voltage monitoring channels, ±2% FS voltage accuracy, ±2.5°C temperature accuracy (−40°C to +125°C), and dual PWM fan control with PI loop + 13-step lookup table support - deployed in CPU-intensive computing platforms requiring autonomous fan response to thermal events.
For engineers reviewing the LM96194CISQX datasheet, LM96194CISQX pinout, LM96194CISQX application, or LM96194CISQX equivalent, key selection considerations include SMBus 2.0 interface compatibility, TruTherm-enabled precision diode measurement for 90nm/65nm processors, dynamic VID monitoring per VRD10.2/11, PROCHOT and THERMTRIP signal handling, and WQFN-48 package integration with 8 configurable GPIOs.
Technical Context
The LM96194CISQX implements a ΣΔ ADC architecture supporting byte/block read/write over SMBus 2.0, with dedicated analog front-end circuitry for four remote thermal diodes (including TruTherm transistor-mode sensing) and nine voltage rails - enabling simultaneous high-accuracy temperature acquisition (9-bit unfiltered, 0.5°C LSB; 12-bit filtered, 0.0625°C LSB) and voltage monitoring (±2% FS max error).
Its fan control subsystem integrates two independent PWM outputs, each programmable via PI control loop, 13-step lookup table, or hybrid mode, with digital filtering applied to temperature readings to suppress acoustic noise - while tachometer inputs (4), ALERT output (interrupt/comparator mode), and VRD_HOT/PROCHOT/VID interfaces provide full processor thermal throttling coordination in single-CPU systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Accuracy | ±2% FS max - ensures reliable rail fault detection across 9 monitored supplies including Vccp, +12V, +3.3V SB, and -12V with external scaling resistors. |
| Temp Resolution | 0.5°C (9-bit raw), 0.0625°C (12-bit filtered) - enables fine-grained thermal zone control and low-noise fan speed modulation. |
| Temp Accuracy | ±2.5°C max (−40°C to +125°C remote range) - validated for Intel Xeon-class embedded diodes and MMBT3904 discrete sensors. |
| Fan Control Outputs | 2 PWM outputs - drive fans independently with boost-on-error capability triggered by tachometer loss or zone temperature exceedance. |
| Interface | SMBus 2.0 compliant - supports host BMC or EC communication at standard clock rates with tri-level address select (3 options). |
| Supply Voltage | +3.0V to +3.6V - powers device from 3.3V standby rail, enabling monitoring during S3/S4 sleep states. |
| Package | WQFN-48 (RHS0048A) - 7mm × 7mm, 0.5mm pitch, thermally enhanced for high-density server motherboard placement. |
Pinout & Package
LM96194CISQX is housed in a 48-pin WQFN package (Texas Instruments package code RHS0048A) with exposed thermal pad, optimized for thermal dissipation and board space efficiency in dense workstation layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PROCHOT | Digital I/O (open-drain) | Connects bidirectionally to CPU PROCHOT signal; triggers thermal throttling when asserted by processor or host. |
| REMOTE1a+/REMOTE1− | Analog input pair | Primary CPU thermal diode interface (TruTherm transistor-mode); supports Intel 90nm/65nm embedded diodes or MMBT3904. |
| PWM1/PWM2 | Digital output (open-drain) | Drives fan speed via duty-cycle modulation; supports automatic 100% boost on tachometer loss or thermal violation. |
| GPIO_0/TACH1–GPIO_3/TACH4 | Configurable I/O | Four pins usable as fan tachometer inputs (pulse counting) or general-purpose open-drain signals. |
| VID0–VID6 | Digital input | 7-bit voltage identification bus from CPU; enables real-time Vccp window comparison per VRD10.2/11 standards. |
Key Features
| Feature | Design Value |
|---|---|
| TruTherm Technology | Transistor-mode thermal diode sensing eliminates ideality errors in sub-micron CPUs, improving accuracy vs. legacy diode-mode ICs. |
| Dual Fan Control Architecture | Simultaneous PI loop + lookup table operation ensures optimal fan speed selection - fastest required speed from either algorithm. |
| Dynamic VID Monitoring | Real-time correlation of VID bits with AD_IN4 (Vccp) enables VRD10/11-compliant fault detection for processor voltage regulation. |
| ALERT Output Modes | Configurable as SMBus interrupt or comparator output - only active for thermal limit violations in comparator mode. |
| XOR-tree Test Mode | On-chip diagnostic path verifies internal register integrity and data path functionality without external test equipment. |
Applications
| Server Thermal Management | Workstation Power Monitoring |
|---|---|
Use Scenario: Real-time monitoring of dual Xeon CPU thermal diodes, Vccp, memory Vtt, and +12V rails in 1U/2U rack servers. IC Role / Device Role / Timing Role: Central hardware monitor coordinating PROCHOT throttling, fan PWM response, and VRD_HOT signaling to maintain safe junction temperatures. Use Value: Prevents thermal runaway via autonomous 100% fan boost on tachometer failure or zone temperature exceedance beyond user-defined limits. | Use Scenario: High-end CAD/CAM workstations with multi-GPU and high-power CPU requiring precise rail health tracking. IC Role / Device Role / Timing Role: Simultaneous 9-rail voltage supervision and 4-zone thermal mapping with 0.0625°C filtered resolution for stable compute loads. Use Value: Enables early warning of PSU degradation or VRM drift through ±2% FS voltage accuracy and limit register violation flags. |
| Processor Throttling Interface | Embedded System Fan Control |
Use Scenario: Single-processor industrial control system using Intel Core i7 with dynamic thermal management requirements. IC Role / Device Role / Timing Role: Intermediary between CPU THERMTRIP/PROCHOT pins and baseboard fan controllers, translating thermal events into PWM actions. Use Value: Reduces firmware dependency by executing autonomous fan boost on PROCHOT assertion or THERMTRIP detection. | Use Scenario: Fan-cooled network appliance with silent operation requirement during low-load conditions. IC Role / Device Role / Timing Role: Dual-PWM controller applying digital filtering to temperature readings to minimize acoustic noise during variable-speed operation. Use Value: Achieves <25 dBA acoustic profile via 12-bit filtered temp resolution and hybrid PI+LUT fan algorithm. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar hardware monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM96163CISQX | Single remote diode input, no VRD_HOT or VID support, lower pin count (32-pin WQFN) | Targeted for cost-sensitive embedded systems without dynamic VID or multi-CPU thermal needs | Select when only basic local + one remote temperature and 5-voltage monitoring are required. |
| ADM1032ARMZ-REEL | 2 remote diodes, no VID interface, no PWM outputs, 10-bit temp resolution (0.25°C), MSOP-8 package | Designed for compact thermal-only monitoring where fan control is handled externally | Choose when fan control is implemented in MCU firmware and only temperature/voltage alerting is needed. |
Compared with LM96194CISQX, LM96163CISQX reduces thermal monitoring scope and eliminates VRD11/VID support, while ADM1032ARMZ-REEL lacks integrated fan control and processor-specific features - making LM96194CISQX uniquely suited for VRD11-compliant single-CPU workstations requiring autonomous thermal response.
Availability
LM96194CISQX is available at Aetrix Electronics and suitable for server thermal management, workstation power monitoring, processor throttling interface, and embedded system fan control requiring stable component supply and long-term lifecycle support.
Supply support for LM96194CISQX 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 delivering analog and embedded processing solutions, with core expertise in precision analog, power management, and interface technologies.
The LM96194CISQX belongs to TI's TruTherm™ hardware monitor product line, engineered specifically for autonomous thermal and power supervision in Intel-based single-processor workstations and entry-level servers compliant with VRD10.2/11 specifications.
FAQ
What is the operating temperature range of the LM96194CISQX?
The LM96194CISQX operates from −40°C to +85°C ambient, while its remote thermal diode measurement accuracy is specified over −40°C to +125°C - enabling reliable CPU die temperature tracking in high-performance computing environments where junction temperatures exceed ambient limits. This extended remote range is critical for validating thermal headroom in Xeon-class processors under load.
Does the LM96194CISQX support VRD11-compliant dynamic VID monitoring?
Yes, the LM96194CISQX supports dynamic VID monitoring for both VRD10.2 and VRD11 specifications, using its seven VID input pins (VID0–VID6) and AD_IN4 (Vccp) channel to perform real-time window comparisons - detecting out-of-spec voltage deviations that could indicate VRM failure or configuration mismatch in Intel-based platforms.
How does the TruTherm technology in the LM96194CISQX improve thermal measurement accuracy?
The LM96194CISQX uses TruTherm technology to model the CPU's embedded thermal diode as a transistor rather than a diode, correcting for ideality factor variation inherent in sub-micron (90nm/65nm) processes - reducing measurement error by up to 3°C versus legacy diode-mode monitors like the LM94, especially at high junction temperatures.
Can the LM96194CISQX control fans autonomously without host intervention?
Yes, the LM96194CISQX executes fully autonomous fan control using its built-in PI loop and 13-step lookup table - responding to temperature thresholds, tachometer faults, or PROCHOT events by driving PWM1/PWM2 to 100% duty cycle without SMBus command latency, ensuring immediate thermal mitigation in mission-critical workstations.
What package type and footprint does the LM96194CISQX use?
The LM96194CISQX uses a 48-pin WQFN package (TI package code RHS0048A), measuring 7mm × 7mm with 0.5mm pitch and an exposed thermal pad - designed for high-density PCB layouts in servers and workstations where thermal performance and space constraints demand compact, low-profile packaging.
LM96194CISQX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- TruTherm™
- Package/Case:
- 48-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Hardware Monitor
- Sensor Type:
- Internal and External
- Sensing Temperature:
- -40°C ~ 125°C
- Accuracy:
- ±2.5°C
- Topology:
- ADC (Sigma Delta), Comparator, Fan Control, Multiplexer, Register Bank
- Output Type:
- 2-Wire SMBus
- Output Alarm:
- Yes
- Output Fan:
- Yes
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-WQFN (7x7)
LM96194CISQX FAQ
1.How can I place an order for LM96194CISQX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM96194CISQX 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 LM96194CISQX reliable?
The price and inventory of LM96194CISQX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM96194CISQX is usually 5 days.
3.What payment methods are accepted for LM96194CISQX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM96194CISQX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM96194CISQX?
LM96194CISQX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM96194CISQX 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 LM96194CISQX?
For technical support, including LM96194CISQX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM96194CISQX requirements.
6.How does Aetrix verify that LM96194CISQX is sourced from the original manufacturer or authorized distributors?
All LM96194CISQX 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 LM96194CISQX meets industry standards.
7.What is the process for return or replacement of LM96194CISQX?
All LM96194CISQX units undergo pre-shipment inspection (PSI). If there is an issue with LM96194CISQX, 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 LM96194CISQX part is unused and in its original packaging.
Return procedure for LM96194CISQX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM96194CISQX Tags
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EMC2101-ACZL-TR
Microchip Technology
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MCP9844T-BE/MNY
Microchip Technology
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EMC2101-R-ACZL-TR
Microchip Technology
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MCP98244T-BE/MNY
Microchip Technology
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TC670ECHTR
Microchip Technology
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SE98ATP,547
NXP Semiconductors
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AMC6821SDBQR
Texas Instruments
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MAX6604AATA+T
Analog Devices Inc./Maxim Integrated
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ADT7475ARQZ-REEL
onsemi
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MAX6643LBBAEE+
Analog Devices Inc./Maxim Integrated
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MAX6684ESA+T
Analog Devices Inc./Maxim Integrated
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MAX6639AEE+
Analog Devices Inc./Maxim Integrated
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