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Texas Instruments LM96194CISQ/NOPB
- Part No.:
- LM96194CISQ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Thermal Management
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
LM96194CISQ/NOPB.pdf
- Description:
- IC TRUTHERM HDWR MONITOR 48WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,193
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Product details
Overview
LM96194CISQ/NOPB from Texas Instruments is a hardware monitor IC with TruTherm™ technology for precision thermal diode measurement, 9-channel voltage monitoring (±2% FS accuracy), 4 remote thermal diode inputs, and dual PWM fan control with PI loop + 13-step lookup table support - deployed in single-processor workstation and server thermal management systems.
For engineers reviewing the LM96194CISQ/NOPB datasheet, LM96194CISQ/NOPB pinout, LM96194CISQ/NOPB application, or LM96194CISQ/NOPB equivalent, key selection criteria include SMBus 2.0 interface compliance, ±2.5°C remote temperature accuracy across –40°C to +125°C, 0.0625°C filtered resolution for fan control, 2-wire tachometer input capability, and VRD10.2/11 dynamic VID monitoring support.
Technical Context
The LM96194CISQ/NOPB integrates 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-based measurement method - optimized for Intel Xeon-class processors on 90nm/65nm processes and MMBT3904 discrete diodes.
It implements autonomous fan control via two independent PWM outputs (PWM1/PWM2), each configurable with programmable PI control parameters or 13-step lookup tables, plus digital temperature filtering to minimize acoustic noise; PROCHOT and THERMTRIP monitoring, VRD_HOT detection, and dynamic Vccp/VID tracking operate independently of the main analog monitoring cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Accuracy | ±2% full-scale - ensures reliable rail monitoring for 9 power supplies including +12V, +5V, +3.3V SB, Vccp, and Mem_Vtt. |
| Temperature Resolution | 9-bit unfiltered (0.5°C LSB) and 12-bit filtered (0.0625°C LSB) - enables precise fan speed ramping with minimal acoustic variation. |
| Remote Temp Accuracy | ±2.5°C max over –40°C to +125°C - validated for embedded processor thermal diodes and discrete transistors like MMBT3904. |
| Fan Control Outputs | 2 PWM outputs with boost-on-error - supports independent or synchronized full-duty-cycle activation on temperature or tachometer fault. |
| Interface | SMBus 2.0 compliant 2-wire serial bus - compatible with BMC and host controllers without protocol translation. |
| Supply Voltage | +3.0V to +3.6V - powers from 3.3V standby rail, enabling low-power state monitoring during S3/S4 sleep. |
| Package | WQFN-48 (RHS0048A) - 7mm × 7mm, 0.5mm pitch, thermally enhanced for high-density motherboard placement. |
Pinout & Package
LM96194CISQ/NOPB is housed in a thermally optimized WQFN-48 package (7mm × 7mm, 0.5mm pitch, exposed thermal pad). Pin assignments are validated per TI SNAS360B Rev. March 2013 datasheet, with 48 I/Os including dual PWM outputs, four tachometer-capable GPIOs, seven VID inputs, dual thermal diode pairs, and SMBus interface signals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWM1 / PWM2 | Fan speed control outputs | Open-drain PWM signals driving external MOSFETs or fan drivers; support 100% duty-cycle boost on error events. |
| GPIO_0–GPIO_3 / TACH1–TACH4 | Fan tachometer inputs | Configurable open-drain inputs accepting TTL/AGTL logic; measure RPM via pulse counting with independent error detection. |
| REMOTE1a+/REMOTE1−, REMOTE2a+/REMOTE2− | Thermal diode interfaces | Dedicated current-source/sink pairs for precision measurement of two CPU thermal diodes using TruTherm transistor model. |
| AD_IN1–AD_IN8 | Analog voltage inputs | Eight scalable analog inputs for rail monitoring (+12V, +5V, +3.3V SB, Vccp, Mem_Vtt, Gbit_Core, -12V); AD_IN1/2/3/8 require external dividers for ±12V. |
| VID0–VID6 | Processor VID inputs | Seven digital inputs capturing dynamic voltage ID codes for real-time Vccp window comparison per VRD10.2/11 specifications. |
| SMBDAT / SMBCLK | SMBus interface | 5V-tolerant open-drain data/clock lines compliant with SMBus 2.0; support block transfers and interrupt-driven ALERT signaling. |
Key Features
| Feature | Design Value |
|---|---|
| TruTherm™ Technology | Treats remote thermal diodes as transistors-not diodes-reducing ideality error for sub-90nm Intel processors and MMBT3904 sensors. |
| Dual Fan Control Architecture | Simultaneous PI loop + 13-step lookup table operation ensures optimal response across transient and steady-state thermal conditions. |
| Dynamic VID Monitoring | Real-time correlation of 6/7 VID bits with Vccp analog input enables VRD10.2/11-compliant fault detection without host intervention. |
| PROCHOT & THERMTRIP Support | Dedicated open-drain inputs for processor hot and thermal trip signals allow hardware-level throttling coordination and error masking. |
| XOR-tree Test Mode | On-chip diagnostic mode validating internal register integrity and interconnect reliability during manufacturing test or field validation. |
Applications
| Server Thermal Management | Workstation Power Integrity |
|---|---|
Use Scenario: Real-time monitoring of dual CPU thermal zones, Vccp, memory rails, and VRD_HOT status in 1U/2U rack servers. IC Role / Device Role / Timing Role: Hardware monitor IC performing autonomous fan control, PROCHOT assertion, and dynamic VID/Vccp window checking. Use Value: Enables silent cooling under load via 0.0625°C filtered temperature resolution and eliminates false throttling with TruTherm-calibrated diode readings. | Use Scenario: Voltage and temperature supervision on high-end desktop workstations with multi-phase VRMs and discrete GPU thermal sensors. IC Role / Device Role / Timing Role: Centralized sensor hub aggregating 9 rail voltages, 4 remote diodes, internal die temp, and 4 tachometer inputs over SMBus. Use Value: Reduces BOM count by replacing discrete ADCs, comparators, and fan controllers while supporting VRD11-compliant dynamic VID tracking. |
| Processor-Based Equipment | Embedded Industrial Control |
Use Scenario: Thermal and power supervision in blade server mezzanine cards with Intel Xeon E3/E5 processors and onboard memory regulators. IC Role / Device Role / Timing Role: System management ASIC interfacing directly with CPU THERMDA/THERMDC pins and VRD controller HOT output. Use Value: Delivers ±2.5°C remote accuracy at 125°C junction temperature - critical for sustained turbo-boost operation without thermal runaway. | Use Scenario: Fan and rail monitoring in fan-cooled industrial PCs operating in extended temperature environments (–40°C to +85°C). IC Role / Device Role / Timing Role: Standalone hardware monitor providing fail-safe fan control, voltage limit alarms, and SMBus-accessible status registers. Use Value: Ensures continuous operation via autonomous boost-on-tach-fault and robust 3.3V SB supply monitoring during AC brownouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar hardware monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM95235CIMM/NOPB | Single remote diode input, no VID monitoring, no PI fan control - only lookup-table-based fan control. | Limited to simpler thermal monitoring in cost-sensitive embedded systems without VRD coordination. | Select when only basic CPU temperature + 5-rail monitoring is required and VRD10/11 compliance is unnecessary. |
| ADM1032ARMZ-REEL | 2 remote diodes, no VID support, no tachometer inputs, SMBus 1.1 only - lacks TruTherm, PI control, and VRD_HOT detection. | Targeted at legacy PC platforms without dynamic VID or multi-zone fan algorithms. | Choose only for drop-in replacement in pre-2007 designs where SMBus 2.0 and VRD11 features are unused. |
Compared with LM96194CISQ/NOPB, LM95235CIMM/NOPB omits VRD10.2/11 VID tracking and autonomous PI control, while ADM1032ARMZ-REEL lacks TruTherm accuracy, tachometer inputs, and SMBus 2.0 features - making LM96194CISQ/NOPB uniquely suited for modern single-CPU workstation thermal management requiring coordinated fan, voltage, and processor interface control.
Availability
LM96194CISQ/NOPB is available at Aetrix Electronics and suitable for server thermal management, workstation power integrity verification, and processor-based equipment requiring stable component supply and long-term lifecycle support.
Supply support for LM96194CISQ/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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, precision, and system-level integration.
The LM96194CISQ/NOPB belongs to TI's TruTherm™ hardware monitor product line, engineered specifically for intelligent thermal and power supervision in single-processor workstations and entry-level servers - balancing high-accuracy diode measurement, autonomous fan control, and VRD-compliant voltage regulation monitoring.
FAQ
What is the operating temperature range of the LM96194CISQ/NOPB?
The LM96194CISQ/NOPB operates from –40°C to +85°C ambient. Its remote thermal diode measurement accuracy is specified from –40°C to +125°C, enabling direct interface with high-junction-temperature CPUs. The internal die temperature sensor shares the same operational range, and all analog functions remain stable across this full industrial temperature span without derating.
Does the LM96194CISQ/NOPB support both SMBus 1.1 and SMBus 2.0 protocols?
The LM96194CISQ/NOPB is explicitly SMBus 2.0 compliant per its datasheet (SNAS360B), supporting byte/block read/write, PEC, and timeout features. It does not implement SMBus 1.1-only commands such as ARP or Host Notify. While backward-compatible with SMBus 1.1 physical layer due to open-drain design, full functionality-including ALERT interrupt mode and block transfers-requires SMBus 2.0 host controller support.
How many thermal diodes can the LM96194CISQ/NOPB monitor simultaneously?
The LM96194CISQ/NOPB monitors up to four thermal diodes concurrently: two dedicated CPU remote diode pairs (REMOTE1a+/− and REMOTE2a+/−) plus two additional inputs (REMOTE1b+/− and REMOTE2b+/−) usable as secondary diode channels or analog voltage inputs. All four zones feed independent digital filters and support TruTherm calibration for Intel 90nm+ processors or MMBT3904 transistors.
Can the LM96194CISQ/NOPB control fans based on both temperature and tachometer feedback?
Yes - the LM96194CISQ/NOPB supports closed-loop fan control using either temperature-derived PWM (via PI loop or lookup table) or tachometer-derived error correction. It also enables hybrid operation: if tachometer input falls below threshold, PWM outputs automatically boost to 100% duty cycle regardless of temperature reading - a feature confirmed in the functional description and event error section of SNAS360B.
What package type and pin count does the LM96194CISQ/NOPB use?
The LM96194CISQ/NOPB uses a WQFN-48 package (TI package code RHS0048A), measuring 7mm × 7mm with 0.5mm pitch and an exposed thermal pad. This 48-pin layout includes dedicated pins for two PWM outputs, four tachometer/GPIOs, seven VID inputs, dual thermal diode interfaces, eight analog voltage inputs, and SMBus 2.0 interface signals - all verified in the official connection diagram and pin description table.
LM96194CISQ/NOPB 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)
LM96194CISQ/NOPB FAQ
1.How can I place an order for LM96194CISQ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM96194CISQ/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 LM96194CISQ/NOPB reliable?
The price and inventory of LM96194CISQ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM96194CISQ/NOPB is usually 5 days.
3.What payment methods are accepted for LM96194CISQ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM96194CISQ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM96194CISQ/NOPB?
LM96194CISQ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM96194CISQ/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 LM96194CISQ/NOPB?
For technical support, including LM96194CISQ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM96194CISQ/NOPB requirements.
6.How does Aetrix verify that LM96194CISQ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM96194CISQ/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 LM96194CISQ/NOPB meets industry standards.
7.What is the process for return or replacement of LM96194CISQ/NOPB?
All LM96194CISQ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM96194CISQ/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 LM96194CISQ/NOPB part is unused and in its original packaging.
Return procedure for LM96194CISQ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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