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Texas Instruments LM96194CISQX/NOPB
- Part No.:
- LM96194CISQX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Thermal Management
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
LM96194CISQX/NOPB.pdf
- Description:
- IC TRUTHERM HDWR MONITOR 48WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,680
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Product details
Overview
LM96194CISQX/NOPB from Texas Instruments is a TruTherm™ hardware monitor IC for workstation/server thermal and power management, featuring 9-channel voltage monitoring (±2% FS accuracy), 4 remote thermal diode inputs with ±2.5°C accuracy over −40°C to +125°C, and dual PWM fan control with PI loop + 13-step lookup table support - deployed in single-processor Intel Xeon-based workstations.
For engineers reviewing the LM96194CISQX/NOPB datasheet, LM96194CISQX/NOPB pinout, LM96194CISQX/NOPB application, or LM96194CISQX/NOPB equivalent, key selection considerations include SMBus 2.0 interface compliance, TruTherm-enabled precision diode measurement for 90nm/65nm processors, autonomous fan boost on tachometer error or temperature violation, and VRD10.2/11 dynamic VID monitoring with PROCHOT and THERMTRIP support.
Technical Context
The LM96194CISQX/NOPB implements a ΣΔ ADC architecture supporting byte/block read/write over SMBus 2.0, with dedicated signal conditioning for four remote thermal diodes using TI's TruTherm transistor-modeling technique - eliminating ideality errors common in sub-micron processor diodes. It integrates independent PROCHOT and VRD_HOT detection logic tied to Intel VRD11 specifications.
Its fan control subsystem runs two parallel algorithms: a 13-step lookup table and a configurable PI loop, both operating on 0.0625°C filtered temperature resolution; fan tachometer inputs (GPIO_0–GPIO_3) feed real-time speed feedback into autonomous boost activation on limit violation or tach error - with programmable minimum boost duration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Accuracy | ±2% full-scale - ensures reliable rail monitoring for +3.3V, +5V, +12V, Vccp, and −12V (with external dividers) |
| Temp Resolution | 0.0625°C filtered - enables fine-grained fan speed ramping to minimize acoustic noise in quiet-system designs |
| Remote Diode Range | −40°C to +125°C - supports thermal tracking of Intel Xeon processors and discrete MMBT3904 sensors |
| Fan Control Outputs | 2 × PWM (open-drain) - drives external MOSFETs or fan drivers with 100% duty-cycle boost capability on error |
| Supply Voltage | +3.0V to +3.6V - compatible with 3.3V standby rails; powers internal circuitry and enables low-power state monitoring |
| Interface | SMBus 2.0 compliant - enables seamless integration with BMCs and host controllers without protocol translation |
| Package | WQFN-48 (RHS0048A) - 7mm × 7mm, 0.5mm pitch; optimized for high-density server motherboard layouts |
Pinout & Package
LM96194CISQX/NOPB is housed in a 48-pin WQFN package (TI package code RHS0048A), thermally enhanced with exposed thermal pad, suitable for conduction-cooled server PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PROCHOT (Pin 1) | Digital I/O (open-drain) | Bidirectional interface to CPU PROCHOT# signal; supports TTL/AGTL logic levels for thermal throttling coordination |
| PWM1 / PWM2 (Pins 41/42) | Digital output (open-drain) | Drives external fan MOSFETs; supports 100% duty-cycle boost on tachometer fault or zone temperature violation |
| GPIO_0–GPIO_3 (Pins 7–10) | Digital I/O (open-drain) | Configurable as fan tachometer inputs - accept standard 2-pulse-per-revolution signals for RPM calculation |
| REMOTE1a+/REMOTE1− (Pins 24/23) | Analog input pair | Current-source-driven positive/negative terminals for first CPU thermal diode; enable TruTherm transistor-mode measurement |
| AD_IN4 (Pin 30) | Analog input | Dedicated +Vccp monitoring input - connects directly to processor core voltage rail for VRD11 dynamic VID correlation |
| SMBDAT / SMBCLK (Pins 18/19) | SMBus interface | 5V-tolerant open-drain data/clock lines - ensure interoperability with legacy SMBus masters in multi-vendor systems |
Key Features
| Feature | Design Value |
|---|---|
| TruTherm™ Technology | Transistor-model thermal diode measurement - reduces ideality error in 90nm/65nm Intel processors vs. legacy diode-mode ICs |
| Dual Fan Control Algorithm | Simultaneous PI loop + 13-step LUT - fans run at highest required speed across zones, preventing thermal runaway |
| Autonomous Fan Boost | Hardware-triggered 100% PWM on tach error or temperature exceedance - no host intervention needed for immediate cooling |
| Dynamic VID Monitoring | 7-bit VID inputs (VID0–VID6) correlated with AD_IN4 - enables real-time Vccp window comparison per VRD10.2/11 spec |
| Multi-Zone Thermal Filtering | 12-bit filtered temperature resolution (0.0625°C) - suppresses noise-induced fan oscillation while preserving fast thermal response |
Applications
| Workstation Thermal Management | Single-CPU Server Monitoring |
|---|---|
Use Scenario: Real-time thermal supervision of Intel Xeon E5/E7 processors in professional CAD/CAE workstations with discrete GPU and memory modules. IC Role / Device Role / Timing Role: Primary hardware monitor - acquires remote diode temperatures, correlates VID/Vccp, triggers PROCHOT, and autonomously adjusts dual PWM fans. Use Value: Prevents thermal throttling during sustained compute loads by maintaining CPU junction < 85°C via 0.0625°C-resolution closed-loop fan control. | Use Scenario: Baseboard-level power and thermal telemetry in 1U rack-mount servers with single-socket Xeon Scalable CPUs and multiple VRMs. IC Role / Device Role / Timing Role: Central sensor hub - monitors 9 rails (+3.3VSB, +12V_CPU, Vccp, −12V), 4 thermal zones, and VRD_HOT status; reports via SMBus to BMC. Use Value: Enables predictive failure alerts (e.g., Vccp droop + rising temp) and automated fan boost before thermal shutdown occurs. |
| Processor VRD Compliance Testing | Embedded Industrial Control Cabinet |
Use Scenario: Validation of VRD11-compliant voltage regulator behavior under dynamic load transients in motherboard qualification labs. IC Role / Device Role / Timing Role: Dynamic VID correlator - synchronizes 7-bit VID inputs with analog Vccp measurements to verify VRD transient response per Intel spec. Use Value: Detects VRD timing violations (e.g., VID change > Vccp settling delay) that cause CPU instability - logged in BMC-accessible status registers. | Use Scenario: Thermal and power integrity monitoring in fan-cooled industrial PLC cabinets housing Intel Atom or Celeron processors. IC Role / Device Role / Timing Role: Standalone thermal manager - uses internal sensor + LM60 on AD_IN8 to regulate cabinet fans via PWM outputs, independent of host OS. Use Value: Maintains ambient cabinet temperature between 25°C–45°C using 0.5°C unfiltered resolution and tach feedback - prevents component derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar hardware monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM96163CISQ/NOPB | 4-channel voltage monitor, 2 remote diodes, single PWM output, no VRD11 VID support | Targeted at cost-sensitive embedded systems - lacks PROCHOT, THERMTRIP, and dual-fan boost logic | Select when only basic thermal supervision of dual-core CPUs is required and VRD compliance is not mandated |
| ADM1032ARMZ-REEL | 2 remote diodes, 1 local sensor, SMBus 1.1, no fan control, ±3°C accuracy, MSOP-8 package | Compact thermal monitor for space-constrained clients - no voltage monitoring or autonomous fan logic | Choose for simple ambient + CPU die temperature tracking where fan actuation is handled externally |
Compared with LM96194CISQX/NOPB, LM96163CISQ/NOPB reduces system BOM count but sacrifices VRD11 validation and dual-fan redundancy; ADM1032ARMZ-REEL offers footprint savings but requires external fan drivers and lacks TruTherm precision for sub-90nm processors.
Availability
LM96194CISQX/NOPB is available at Aetrix Electronics and suitable for workstation thermal management, single-CPU server telemetry, and VRD11 compliance validation requiring stable component supply and long-term lifecycle support.
Supply support for LM96194CISQX/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 heritage in precision sensing and power management ICs.
The LM96194CISQX/NOPB belongs to TI's TruTherm™ hardware monitor product line, engineered specifically for Intel-based single-processor workstations and servers requiring high-accuracy thermal diode measurement, autonomous fan control, and VRD10.2/11 compliance.
FAQ
What is the operating temperature range for the LM96194CISQX/NOPB?
The LM96194CISQX/NOPB operates from −40°C to +85°C ambient. Its remote thermal diode measurement range extends to −40°C to +125°C, enabling accurate junction temperature tracking of Intel Xeon processors. The internal ambient sensor provides local board temperature readings with ±2.5°C max accuracy across this full range. This specification is validated per the SNAS360B datasheet revision March 2013.
Does the LM96194CISQX/NOPB support VRD11 dynamic VID monitoring?
Yes, the LM96194CISQX/NOPB supports VRD11 dynamic VID monitoring using its 7-bit VID inputs (VID0–VID6) and dedicated AD_IN4 (Vccp) channel. It performs real-time window comparison between VID codes and measured Vccp voltage, flagging violations in status registers per VRD11 specification. This capability is explicitly documented in the Functional Description and Register sections of the SNAS360B datasheet.
How many thermal diodes can the LM96194CISQX/NOPB monitor simultaneously?
The LM96194CISQX/NOPB monitors up to four remote thermal diodes concurrently - two per CPU (Zones 1a/1b and 2a/2b), plus internal die temperature and optional LM60 analog sensor input on AD_IN8. Each remote channel uses TI's TruTherm technology for transistor-mode measurement, optimized for Intel 90nm/65nm processors and MMBT3904 discrete diodes.
What fan control methods does the LM96194CISQX/NOPB implement?
The LM96194CISQX/NOPB implements three fan control methods: a 13-step lookup table, a configurable PI (proportional/integral) control loop, and a hybrid mode combining both. Temperature inputs are filtered to 0.0625°C resolution for stable output, and hardware-triggered 100% PWM boost activates on tachometer loss or zone temperature exceedance - all without host processor involvement.
Is the LM96194CISQX/NOPB pin-compatible with earlier TI hardware monitors like the LM94?
No, the LM96194CISQX/NOPB is not pin-compatible with the LM94. While it inherits functional features from the LM94 (e.g., dual-CPU support concepts), the LM96194CISQX/NOPB uses a 48-pin WQFN package (RHS0048A) with distinct pin assignments - including dedicated REMOTE2a+/REMOTE2−, AD_IN8 for LM60, and VRD_HOT input - differing significantly from the LM94's QFP or other封装. Migration requires PCB layout revision.
LM96194CISQX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- TruTherm™
- Package/Case:
- 48-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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/NOPB FAQ
1.How can I place an order for LM96194CISQX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM96194CISQX/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 LM96194CISQX/NOPB reliable?
The price and inventory of LM96194CISQX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM96194CISQX/NOPB is usually 5 days.
3.What payment methods are accepted for LM96194CISQX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM96194CISQX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM96194CISQX/NOPB?
LM96194CISQX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM96194CISQX/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 LM96194CISQX/NOPB?
For technical support, including LM96194CISQX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM96194CISQX/NOPB requirements.
6.How does Aetrix verify that LM96194CISQX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM96194CISQX/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 LM96194CISQX/NOPB meets industry standards.
7.What is the process for return or replacement of LM96194CISQX/NOPB?
All LM96194CISQX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM96194CISQX/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 LM96194CISQX/NOPB part is unused and in its original packaging.
Return procedure for LM96194CISQX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM96194CISQX/NOPB Tags
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EMC2101-ACZL-TR
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