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Texas Instruments LM96000CIMTX/NOPB
- Part No.:
- LM96000CIMTX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Thermal Management
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM96000CIMTX/NOPB.pdf
- Description:
- IC HDWR MON W/FAN CTRL 24-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:992
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Product details
Overview
LM96000CIMTX/NOPB from Texas Instruments is a hardware monitor IC with integrated autonomous fan control, designed for motherboard-level thermal and power supervision. It features an 8-bit ΣΔ ADC, monitors five voltage rails (VCCP, 2.5V, 3.3VSBY, 5V, 12V), two remote thermal diodes, and provides three PWM fan outputs with programmable spin-up and hysteresis - used in desktop PC and microprocessor-based equipment for real-time thermal management.
For engineers reviewing the LM96000CIMTX/NOPB datasheet, LM96000CIMTX/NOPB pinout, LM96000CIMTX/NOPB application, or LM96000CIMTX/NOPB equivalent, key selection considerations include SMBus 2.0 compliance, ±3°C remote temperature accuracy over 0°C to +125°C, 3.0V–3.6V supply operation, 24-pin TSSOP package, and VID line monitoring for CPU voltage identification.
Technical Context
The LM96000CIMTX/NOPB implements a dedicated analog front-end with internal scaling resistors for five voltage inputs and dual current-source/sink channels for remote diode sensing. Its 8-bit ΣΔ ADC digitizes temperature and voltage data with 1°C resolution and ±2% full-scale accuracy on voltage measurements.
Autonomous fan control operates via three independent PWM outputs, each assignable to one of three thermal zones. Fan behavior is governed by configurable tachometer inputs (4), spike-smoothing filters, absolute temperature limits, and hysteresis registers - all managed through SMBus 2.0 without host CPU intervention during normal operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | +3.0 V to +3.6 V - powers internal circuitry and enables low-power standby monitoring of 3.3VSBY rail |
| Temperature Accuracy | ±3°C max (0°C to +125°C remote diode range) - ensures reliable thermal zone triggering for fan speed transitions |
| Voltage Measurement Accuracy | ±2% FS max - supports accurate detection of over/under-voltage conditions on critical motherboard rails |
| PWM Outputs | 3 open-drain outputs with 10 Hz–30 kHz frequency range and 0.39% duty-cycle resolution - enables fine-grained, noise-resistant fan speed control |
| Tachometer Inputs | 4 digital inputs supporting up to 65536-count fan RPM measurement - allows precise closed-loop speed verification across multiple cooling zones |
| SMBus Interface | SMBus 2.0 compliant, 10–100 kHz clock, 5V-tolerant pins - ensures interoperability with standard system management controllers and BIOS firmware |
| Package | 24-pin TSSOP (4.4 mm × 7.8 mm, 0.65 mm pitch) - surface-mount compatible with high-density motherboard layouts |
Pinout & Package
LM96000CIMTX/NOPB uses a 24-pin Thin Shrink Small Outline Package (TSSOP) with exposed pad for thermal dissipation. Pin functions are validated per TI SNAS234C Rev. March 2013 datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SMBDAT (Pin 1) | Open-drain bidirectional data line | SMBus 2.0 data channel; 5V tolerant; requires external pull-up for communication |
| SMBCLK (Pin 2) | Input clock line | SMBus 2.0 clock input; 5V tolerant; synchronizes register reads/writes and configuration updates |
| GND (Pin 3) | Analog/digital ground reference | Common return path for all analog measurements and digital logic; must be low-impedance |
| 3.3V (Pin 4) | Power supply and analog input | Supplies IC core; also serves as monitored 3.3V rail input with internal attenuation |
| VID0–VID4 (Pins 5,6,7,8,19) | Digital voltage ID inputs | Reads processor VID bits to determine target VCCP; stored in VID0–VID4 Status Register |
| REMOTE1+/− (Pins 18,17) | Remote diode sensing pair | Current-source (+) and current-sink (−) terminals for first external thermal diode (e.g., Pentium THERMDA/DC) |
| REMOTE2+/− (Pins 16,15) | Remote diode sensing pair | Second independent current-source/sink channel for dual-processor or multi-zone thermal monitoring |
| PWM1/xTESTOUT (Pin 24) | Fan control output / test mode | Open-drain PWM output for Fan 1; doubles as XOR-tree test output when enabled |
| PWM2 (Pin 10) | Fan control output | Open-drain PWM output for Fan 2; independently configurable for thermal zone assignment |
| PWM3/AddressEnable (Pin 13) | Fan control output / address config | Open-drain PWM output for Fan 3; pulled low at power-on to enable SMBus address selection mode |
| TACH1–TACH4 (Pins 11,12,9,14) | Fan tachometer inputs | Digital inputs accepting TTL/CMOS fan feedback pulses; support 4-channel RPM monitoring with 65536-count resolution |
| VCCP_IN (Pin 23) | Analog voltage input | Monitors processor core voltage with internal scaling; used with VID lines for dynamic VCCP validation |
| 2.5V / 5V / 12V (Pins 22,20,21) | Analog voltage inputs | High-impedance inputs for +2.5V, +5V, and +12V rail monitoring using internal resistor dividers |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous fan control | Three PWM outputs dynamically adjust based on user-configurable thermal zone thresholds - eliminates continuous host polling |
| Noise filtering for temperature readings | Spike-smoothing filter with adjustable time interval (0.35 s to 0.8 s) suppresses transient thermal noise before fan response |
| Integrated VID monitoring | Five VID input pins directly interface with CPU voltage identification bus - enables real-time correlation between VID code and measured VCCP |
| Multi-rail voltage supervision | Simultaneous monitoring of VCCP, 2.5V, 3.3VSBY, 5V, and 12V with ±2% FS accuracy - supports comprehensive power integrity validation |
| Remote diode interface | Dual independent current-source/sink channels (188 µA typical) optimized for Intel Pentium 4 90nm and 2N3904-based thermal diodes |
| XOR-tree test mode | On-chip diagnostic mode accessible via PWM1/xTESTOUT pin - verifies internal logic paths without external test equipment |
Applications
| Desktop PC Motherboard Monitoring | Microprocessor-Based Network Equipment |
|---|---|
|
Use Scenario: Real-time thermal and power supervision on ATX motherboards with dual-core CPUs and discrete GPU. IC Role / Device Role / Timing Role: Hardware monitor IC performing autonomous fan speed regulation and voltage fault detection independent of BIOS or OS. Use Value: Prevents thermal throttling and voltage-related crashes by triggering fan ramp-up before CPU junction exceeds 95°C and flagging 5V rail deviation >±5%. |
Use Scenario: Thermal management in enterprise routers with multi-core SoCs and high-power PHYs operating 24/7. IC Role / Device Role / Timing Role: Standalone thermal supervisor interfacing with remote diodes on SoC and switch ICs to drive chassis fans via PWM. Use Value: Maintains ambient board temperature <65°C under full packet load by adjusting fan speed in response to remote diode readings with ±3°C accuracy. |
| ATM Power Supply Health Monitoring | Point-of-Sale Terminal Thermal Control |
|
Use Scenario: Monitoring 12V/5V/3.3V rails and CPU die temperature in unattended banking kiosks deployed in varying ambient conditions. IC Role / Device Role / Timing Role: System health monitor providing voltage limit alerts and temperature-triggered fan activation to prevent condensation-induced failure. Use Value: Extends mean time between failures (MTBF) by detecting 12V rail sag >10% and initiating forced airflow before internal humidity reaches dew point. |
Use Scenario: Compact retail POS terminals with ARM-based processors requiring silent operation until thermal threshold is exceeded. IC Role / Device Role / Timing Role: Low-power hardware monitor enabling zero-RPM fan mode below 45°C and smooth PWM ramping above threshold. Use Value: Achieves acoustic noise <25 dBA at idle while ensuring processor stays within 70°C junction limit during peak barcode scanning bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar hardware monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM96163CIMT/NOPB | Higher temperature accuracy (±1.5°C remote), integrated 10-bit ADC, adds local temperature sensor with ±1°C accuracy | Supports more demanding thermal profiling in server-class embedded systems with tighter margin requirements | Select when ±1.5°C remote accuracy and enhanced ADC resolution are required; same 24-pin TSSOP footprint but not pin-compatible |
| ADM1027ARUZ | Includes SMBus timeout reset, enhanced VID decoding (up to 8-bit), and additional GPIOs for alarm signaling | Better suited for industrial systems requiring watchdog-style bus recovery and multi-level fault escalation | Choose for designs needing robust SMBus fault recovery and flexible alarm output routing; 24-pin TSSOP but different pin mapping |
Compared with LM96000CIMTX/NOPB, LM96163CIMT/NOPB offers improved thermal precision and resolution at higher cost, while ADM1027ARUZ adds bus reliability features and alarm flexibility - both require PCB layout changes due to non-identical pinouts and register maps.
Availability
LM96000CIMTX/NOPB is available at Aetrix Electronics and suitable for desktop PC motherboards, microprocessor-based network equipment, and ATM/POS terminal designs requiring stable component supply and long-term lifecycle support.
Supply support for LM96000CIMTX/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 for industrial, automotive, and computing markets.
The LM96000CIMTX/NOPB belongs to TI's hardware monitor product line, engineered specifically for autonomous thermal and power supervision in x86-based computing platforms where SMBus integration and multi-rail monitoring are essential.
FAQ
What is the operating temperature range of the LM96000CIMTX/NOPB?
The LM96000CIMTX/NOPB has an operational ambient temperature range of 0°C to +85°C. Its remote diode sensing capability extends to 0°C to +125°C, enabling accurate thermal monitoring of high-temperature components such as CPUs and GPUs. This specification is confirmed in the Operating Ratings section of TI's SNAS234C datasheet, and applies to the LM96000CIMTX/NOPB variant specifically.
Does the LM96000CIMTX/NOPB support SMBus 2.0 protocol features like block read/write?
The LM96000CIMTX/NOPB is fully compliant with SMBus 2.0 specifications, including support for byte read/write, word read/write, and process call commands. However, it does not implement SMBus block read/write or PEC (Packet Error Checking) - its register map is accessed exclusively via byte and word transactions as defined in the LM96000CIMTX/NOPB datasheet Section 1.0 SMBUS.
Can the LM96000CIMTX/NOPB monitor both VCCP and processor VID lines simultaneously?
Yes, the LM96000CIMTX/NOPB monitors VCCP via the VCCP_IN analog input (Pin 23) while simultaneously reading VID0–VID4 digital inputs (Pins 5,6,7,8,19). The VID values are stored in the VID0–VID4 Status Register (Address 43h), allowing real-time correlation between commanded and measured processor core voltage - a key feature verified in the Functional Description and Register Map sections of the LM96000CIMTX/NOPB datasheet.
How many thermal zones can be configured using the LM96000CIMTX/NOPB?
The LM96000CIMTX/NOPB supports three independent thermal zones: Zone 1 (process/die temperature), Zone 2 (internal sensor), and Zone 3 (remote diode). Each of the three PWM outputs can be assigned to any zone via the Fan Configuration Registers (5Ch–5Eh), and absolute temperature limits and hysteresis are individually programmable per zone - as documented in the Auto Fan Control Operating Mode and Register Set sections of the LM96000CIMTX/NOPB datasheet.
Is the LM96000CIMTX/NOPB pin-compatible with other TI hardware monitors like the LM96163?
No, the LM96000CIMTX/NOPB is not pin-compatible with the LM96163CIMT/NOPB. Although both use 24-pin TSSOP packages, their pin assignments differ significantly - for example, LM96163 relocates VID inputs and adds dedicated ALERT# and THERM# outputs. Migration requires PCB layout revision and firmware register map updates, as confirmed by comparing the Connection Diagrams and Pin Descriptions in their respective datasheets.
LM96000CIMTX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Hardware Monitor
- Sensor Type:
- Internal and External
- Sensing Temperature:
- 0°C ~ 125°C
- Accuracy:
- ±3°C Local(Max), ±4°C Remote(Max)
- Topology:
- ADC (Sigma Delta), Comparator, Fan Control, Multiplexer, Register Bank
- Output Type:
- 2-Wire SMBus
- Output Alarm:
- No
- Output Fan:
- Yes
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- 0°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
LM96000CIMTX/NOPB FAQ
1.How can I place an order for LM96000CIMTX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM96000CIMTX/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 LM96000CIMTX/NOPB reliable?
The price and inventory of LM96000CIMTX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM96000CIMTX/NOPB is usually 5 days.
3.What payment methods are accepted for LM96000CIMTX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM96000CIMTX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM96000CIMTX/NOPB?
LM96000CIMTX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM96000CIMTX/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 LM96000CIMTX/NOPB?
For technical support, including LM96000CIMTX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM96000CIMTX/NOPB requirements.
6.How does Aetrix verify that LM96000CIMTX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM96000CIMTX/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 LM96000CIMTX/NOPB meets industry standards.
7.What is the process for return or replacement of LM96000CIMTX/NOPB?
All LM96000CIMTX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM96000CIMTX/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 LM96000CIMTX/NOPB part is unused and in its original packaging.
Return procedure for LM96000CIMTX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM96000CIMTX/NOPB Tags
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EMC2101-ACZL-TR
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EMC2101-R-ACZL-TR
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