My Inquiry
My Account
Texas Instruments LM94CIMTX/NOPB
- Part No.:
- LM94CIMTX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Thermal Management
- Package:
- 56-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
LM94CIMTX/NOPB.pdf
- Description:
- IC HARDWARE MONITOR 56-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,482
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM94CIMTX/NOPB from Texas Instruments is a hardware monitor IC for dual-processor server management, featuring an 8-bit ΣΔ ADC, monitoring of 16 power supplies and 4 remote thermal diodes, PI-loop fan control with two PWM outputs, and SMBus 2.0 interface in a 56-pin TSSOP package.
For engineers reviewing the LM94CIMTX/NOPB datasheet, LM94CIMTX/NOPB pinout, LM94CIMTX/NOPB application, or LM94CIMTX/NOPB equivalent, key selection criteria include remote diode temperature accuracy (±2.5°C), dual VRD10.2/11 VID support, autonomous fan control via lookup table or PI loop, and integration of PROCHOT monitoring and tachometer inputs for server thermal management.
Technical Context
The LM94CIMTX/NOPB implements TruTherm™ technology to enable precision thermal diode measurements on sub-micron processors, supporting both CPU1 and CPU2 thermal diodes with dedicated REMOTE1a+/− and REMOTE2a+/− pins plus secondary inputs (REMOTE1b+, REMOTE2b+). Its dual PWM fan control outputs are driven by either a 13-step lookup table or a configurable PI control loop that supports Tcontrol setpoints.
It integrates dual dynamic VID monitoring (6–7 VIDs per processor), dual PROCHOT detection, and 8 GPIOs-4 configurable as tachometer inputs, 2 for THERMTRIP monitoring, and 2 for IERR signal detection-alongside 2 general-purpose inputs for VRD11's 7th VID signal. All analog inputs use external attenuation for ±12V compatibility, and digital I/Os support TTL and AGTL+ logic levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC Resolution | 8-bit ΣΔ converter enabling precise voltage and temperature digitization with 100 ms max monitoring cycle time |
| Temperature Accuracy | ±2.5°C max over 0°C to +125°C remote diode range, critical for Xeon-class CPU thermal throttling decisions |
| Voltage Measurement Accuracy | ±2% full-scale error across 16 monitored rails, ensuring reliable power integrity validation |
| Fan Control Modes | Configurable PI loop, 13-step lookup table, or hybrid mode-enabling acoustically optimized speed response to thermal transients |
| SMBus Interface | SMBus 2.0 compliant with byte/block read/write, tri-level address select (3 slave addresses), and ALERT interrupt/comparator modes |
| Supply Voltage Range | +3.0 V to +3.6 V operation, compatible with standard 3.3V server standby and main rails |
| Package | 56-pin TSSOP (DGG0056A), footprint-compatible with high-density server motherboard layouts |
Pinout & Package
LM94CIMTX/NOPB is housed in a 56-pin TSSOP package (Texas Instruments package code DGG0056A), optimized for thermal performance and board space efficiency in dense server PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GPIO_0/TACH1 – Pin 1 | Fan tachometer input or open-drain GPIO | Supports RPM feedback from up to four fans; configurable per register to reduce external component count |
| PWM1 – Pin 41 | Fan speed control output | Open-drain PWM output driving fan 1; supports PI-loop or LUT-based duty-cycle modulation |
| REMOTE1a+ / REMOTE1− – Pins 20 & 19 | CPU1 thermal diode interface | Dedicated current-source (+) and current-sink (−) pair for accurate TruTherm™ measurement of first CPU1 diode |
| SMBDAT / SMBCLK – Pins 13 & 14 | SMBus 2.0 bidirectional interface | 5V-tolerant open-drain data/clock lines enabling communication with BMC without level shifters |
| P1_VID0–P1_VID6 / P2_VID0–P2_VID6 – Pins 43–48, 51–56 | Processor VID inputs | Supports VRD10.2/11 compliance with up to 7 VID bits per CPU for dynamic Vccp tracking |
Key Features
| Feature | Design Value |
|---|---|
| TruTherm™ Technology | Enables ±2.5°C remote diode accuracy on 90nm/65nm CPUs, directly supporting Intel Xeon thermal throttling requirements |
| Dual PI-loop Fan Control | Two independent PWM outputs each managed by configurable proportional/integral parameters, minimizing acoustic noise during transient thermal events |
| Dynamic VID Monitoring | Simultaneous capture of 6–7 VID bits per processor enables real-time Vccp tracking aligned with VRD10.2/11 specifications |
| PROCHOT & THERMTRIP Monitoring | Dual open-drain inputs per CPU allow direct connection to PROCHOT and THERMTRIP signals for coordinated thermal shutdown sequencing |
| Digital Temperature Filtering | Configurable digital filters provide 0.0625°C resolution for fan control decisions while maintaining 0.5°C raw sensor resolution for status reporting |
Applications
| Server Thermal Management | Workstation Power Integrity |
|---|---|
Use Scenario: Real-time monitoring and closed-loop fan control in dual-socket Xeon servers with multiple voltage rails and thermal zones. IC Role / Device Role / Timing Role: Central hardware monitor coordinating temperature, voltage, and fan speed via SMBus to BMC; executes PI-loop fan control autonomously. Use Value: Enables silent cooling under load by smoothing temperature readings and dynamically adjusting PWM duty cycles without host intervention. | Use Scenario: Validation of 16 power supply rails-including +12V, +5V, +3.3V, Vccp, and memory voltages-in high-end workstations with multi-GPU configurations. IC Role / Device Role / Timing Role: Precision analog front-end with ±2% FS voltage accuracy and 100 ms total monitoring cycle, feeding rail health status to system firmware. Use Value: Reduces need for discrete voltage supervisors and external ADCs, lowering BOM cost and PCB area in compact workstation motherboards. |
| Dual-Processor Throttling | VRD10.2/11 Compliant Platform |
Use Scenario: Coordinated thermal throttling across two Xeon processors using PROCHOT, THERMTRIP, and dynamic VID feedback. IC Role / Device Role / Timing Role: Dual-proc thermal supervisor with independent PROCHOT inputs, VID decoding, and THERMTRIP masking logic. Use Value: Prevents localized overheating by triggering simultaneous throttling when either CPU exceeds safe junction temperature. | Use Scenario: Motherboard design targeting VRD10.2/11 compliance for next-generation server platforms requiring dynamic Vccp regulation. IC Role / Device Role / Timing Role: VID decoder and Vccp monitor (AD_IN7/AD_IN8) with 7-bit per-CPU support and VRD_HOT detection inputs. Use Value: Eliminates need for external VID latches or discrete Vccp sensing circuits, simplifying VRD interface and improving measurement timing alignment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar hardware monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM93CIMT/NOPB | Lacks TruTherm™, supports only 2 remote diodes, no VRD11 7th-VID inputs, single PWM output | Targeted at single-processor or legacy VRD10 platforms; lower thermal accuracy (±3°C) | Select when cost sensitivity outweighs dual-CPU thermal precision and VRD11 feature requirements |
| ADM1032ARMZ-REEL | Single remote diode, no VID monitoring, no PROCHOT/THERMTRIP inputs, 10-bit ADC, SOIC-8 package | Entry-level thermal monitor for embedded or low-complexity systems-not suitable for dual-Xeon server management | Choose only for non-server applications where SMBus temperature monitoring suffices without power rail or fan control integration |
Compared with LM93CIMT/NOPB, LM94CIMTX/NOPB adds dual-CPU thermal diode support, VRD11 compliance, and autonomous PI-loop fan control-making it essential for modern dual-socket server designs. Versus ADM1032ARMZ-REEL, it delivers full platform monitoring capability rather than isolated thermal sensing, eliminating need for multiple discrete ICs.
Availability
LM94CIMTX/NOPB is available at Aetrix Electronics and suitable for server thermal management, workstation power integrity validation, and dual-processor throttling applications requiring stable component supply and long-term lifecycle support.
Supply support for LM94CIMTX/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 for industrial, automotive, and computing markets.
The LM94CIMTX/NOPB belongs to TI's TruTherm™ hardware monitor product line, engineered specifically for high-accuracy thermal and power supervision in dual-processor server and workstation platforms.
FAQ
What is the primary function of the LM94CIMTX/NOPB in server platforms?
The LM94CIMTX/NOPB serves as a centralized hardware monitor IC for dual-processor server motherboards. It measures 16 power supply voltages, monitors 4 remote thermal diodes and internal die temperature, executes autonomous PI-loop or lookup-table fan control via two PWM outputs, and supports VRD10.2/11 dynamic VID decoding and PROCHOT/THERMTRIP monitoring-all through an SMBus 2.0 interface. This integration reduces system complexity and improves thermal reliability in Xeon-class platforms.
Does the LM94CIMTX/NOPB support both VRD10.2 and VRD11 specifications?
Yes, the LM94CIMTX/NOPB supports both VRD10.2 and VRD11 specifications. It monitors up to 7 VID bits per processor (P1_VID0–P1_VID6 and P2_VID0–P2_VID6), includes dedicated VRD_HOT inputs (VRD1_HOT and VRD2_HOT), and provides AD_IN7 and AD_IN8 for direct CPU1/CPU2 Vccp sensing-meeting all key voltage regulation and dynamic VID tracking requirements defined in VRD10.2 and VRD11 standards.
How does the TruTherm™ technology in the LM94CIMTX/NOPB improve thermal measurement accuracy?
TruTherm™ technology in the LM94CIMTX/NOPB enables ±2.5°C remote diode temperature accuracy over 0°C to +125°C by compensating for process- and temperature-dependent non-idealities in sub-micron CPU thermal diodes. It uses calibrated current-source/sink pairs (e.g., REMOTE1a+/−) and digital filtering to suppress noise and offset drift-delivering precision required for reliable PROCHOT assertion and thermal throttling in modern Xeon processors fabricated on 90nm or 65nm processes.
Can the LM94CIMTX/NOPB operate autonomously without host processor intervention?
Yes, the LM94CIMTX/NOPB can operate autonomously. Its fan control engine supports fully self-contained PI-loop or lookup-table operation using onboard registers and temperature filters. It triggers ALERT output on limit violations, asserts PROCHOT based on thermal thresholds, and manages fan boost on tachometer errors-all without continuous host polling. Host interaction is optional for configuration and status readback via SMBus.
What package type and pin count does the LM94CIMTX/NOPB use?
The LM94CIMTX/NOPB uses a 56-pin TSSOP package (Texas Instruments package code DGG0056A). This surface-mount package features a 0.5 mm pitch, exposes the thermal pad on the underside for enhanced heat dissipation, and is designed for high-density server motherboard layouts where space and thermal performance are critical.
LM94CIMTX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- TruTherm™
- Package/Case:
- 56-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Hardware Monitor
- Sensor Type:
- Internal and External
- Sensing Temperature:
- 0°C ~ 125°C
- Accuracy:
- ±2.5°C(Max)
- Topology:
- ADC (Sigma Delta), Comparator, Fan Control, Multiplexer, Register Bank
- Output Type:
- 2-Wire Serial, I2C/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:
- 56-TSSOP
LM94CIMTX/NOPB FAQ
1.How can I place an order for LM94CIMTX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM94CIMTX/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 LM94CIMTX/NOPB reliable?
The price and inventory of LM94CIMTX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM94CIMTX/NOPB is usually 5 days.
3.What payment methods are accepted for LM94CIMTX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM94CIMTX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM94CIMTX/NOPB?
LM94CIMTX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM94CIMTX/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 LM94CIMTX/NOPB?
For technical support, including LM94CIMTX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM94CIMTX/NOPB requirements.
6.How does Aetrix verify that LM94CIMTX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM94CIMTX/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 LM94CIMTX/NOPB meets industry standards.
7.What is the process for return or replacement of LM94CIMTX/NOPB?
All LM94CIMTX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM94CIMTX/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 LM94CIMTX/NOPB part is unused and in its original packaging.
Return procedure for LM94CIMTX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM94CIMTX/NOPB Tags
-
EMC2101-ACZL-TR
Microchip Technology
-
MCP9844T-BE/MNY
Microchip Technology
-
EMC2101-R-ACZL-TR
Microchip Technology
-
MCP98244T-BE/MNY
Microchip Technology
-
TC670ECHTR
Microchip Technology
-
SE98ATP,547
NXP Semiconductors
-
AMC6821SDBQR
Texas Instruments
-
MAX6604AATA+T
Analog Devices Inc./Maxim Integrated
-
ADT7475ARQZ-REEL
onsemi
-
MAX6643LBBAEE+
Analog Devices Inc./Maxim Integrated
-
MAX6684ESA+T
Analog Devices Inc./Maxim Integrated
-
MAX6639AEE+
Analog Devices Inc./Maxim Integrated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
