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Texas Instruments LM93CIMT
- Part No.:
- LM93CIMT
- Manufacturer:
- Texas Instruments
- Category:
- Specialized
- Package:
- 56-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
LM93CIMT.pdf
- Description:
- IC INTERFACE SPECIALIZED 56TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,773
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Product details
Overview
LM93CIMT from Texas Instruments is a hardware monitor IC for dual-processor server management, integrating 16-channel voltage monitoring (±12V, +3.3V, +5V, Vccp1/2, FSB_Vtt), dual remote thermal diode sensing (CPU1/CPU2), internal ambient temperature sensing, two PWM fan control outputs, four tachometer inputs, and SMBus 2.0 interface. It supports autonomous fan control via 13-step lookup table and digital temperature filtering.
For engineers reviewing the LM93CIMT datasheet, LM93CIMT pinout, LM93CIMT application, or LM93CIMT equivalent, key selection considerations include its 56-pin TSSOP package, dual PROCHOT/VID monitoring capability, ±2% FS voltage accuracy, 1°C internal temperature resolution, and support for Xeon-class motherboard thermal throttling and dynamic Vccp tracking.
Technical Context
The LM93CIMT implements an 8-bit ΣΔ ADC with inherent averaging-1.5 ms sampling for voltage channels and 8.4 ms for temperature measurements-enabling noise-immune readings in electrically noisy server environments. Its analog front-end includes internal scaling for 12 of 16 voltage inputs, while ±12V rails require external resistor dividers meeting 1–7 kΩ Thevenin impedance.
Temperature monitoring covers three zones: Zone 1 (REMOTE1+, REMOTE1−), Zone 2 (REMOTE2+, REMOTE2−), and Zone 3 (internal die sensor), all reported as 8-bit two's-complement values with 1°C LSB resolution. Fan control uses two independent PWM outputs, each configurable across up to four temperature zones with programmable boost and digital filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Inputs | 16 analog inputs: 12 internally scaled (+3.3V SB, +5V, +12V×3, Vccp1/2, Mem_Core/Vtt, FSB_Vtt, SCSI_Core, Gbit_Core); ±12V require external dividers |
| ADC Architecture | 8-bit ΣΔ with inherent averaging: 1.5 ms integration for voltage, 8.4 ms for temperature-reduces need for external RC filtering |
| Temperature Sensing | Three sources: two remote diodes (CPU1/CPU2), one internal sensor; all output 8-bit two's-complement data with 1°C LSB |
| Fan Control | Two open-drain PWM outputs; each supports 13-step lookup table per zone, digital temperature filtering, and fan boost activation |
| SMBus Interface | SMBus 2.0 compliant, 2-wire, byte/block read/write; tri-level Address Select pin enables 1 of 3 slave addresses (0x2C/0x2D/0x2E) |
| Accuracy | Voltage measurement: ±2% full-scale; temperature sensor: ±3°C max over 0°C to +85°C operating range |
| Supply & Power | +3.0V to +3.6V supply; typical current draw 0.9 mA; 2.5V reference output available for external circuitry |
Pinout & Package
LM93CIMT is housed in a 56-pin TSSOP package (Package Code: DGG0056A), optimized for high-density server motherboard layouts with exposed thermal pad for improved heat dissipation under sustained monitoring load.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GPIO_0/TACH1 – GPIO_3/TACH4 | Fan tachometer / GPIO | Four configurable open-drain inputs supporting RPM measurement or general-purpose logic-level monitoring |
| REMOTE1+/REMOTE1−, REMOTE2+/REMOTE2− | Remote thermal diode interface | Dedicated current-source/sink pairs for direct connection to CPU1/CPU2 embedded thermal diodes (e.g., Pentium/Xeon THERMDA/THERMDC) |
| PWM1, PWM2 | Fan speed control outputs | Open-drain PWM signals driving external MOSFETs or fan controllers; duty cycle determined by zone-based lookup table |
| P1_PROCHOT, P2_PROCHOT | Processor hot signal I/O | Bidirectional open-drain interface with level-shifting for CPU1/CPU2 PROCHOT assertion and throttling coordination |
| P1_VID0–P1_VID5, P2_VID0–P2_VID5 | Dynamic VID inputs | 12 digital inputs capturing 6-bit VID codes from dual processors to track real-time Vccp changes during frequency scaling |
| AD_IN1–AD_IN16 | Analog voltage monitoring inputs | 16 dedicated channels with defined full-scale ranges (e.g., AD_IN1 = +12V1 → 0.927V nominal; AD_IN15 = −12V → 1.236V full scale after external offset) |
| SMBDAT, SMBCLK | SMBus interface | 5V-tolerant open-drain data line and clock input enabling communication with BMC or host controller without level shifters |
| ALERT/XtestOut | Interrupt output / test mode | Open-drain active-low interrupt signaling limit violations; repurposed as XOR-tree output during factory test mode |
Key Features
| Feature | Design Value |
|---|---|
| Dual dynamic Vccp monitoring | Simultaneous tracking of CPU1/CPU2 core voltages via 6-bit VID inputs-enables real-time thermal margining during DVFS transitions |
| Autonomous fan control | Programmable 13-step lookup table per PWM output, with zone-specific temperature weighting and digital filter smoothing-reduces host CPU polling overhead |
| PROCHOT monitoring & control | Dual open-drain PROCHOT interfaces with bidirectional level shifting-supports both processor-initiated throttling and BMC-driven thermal shutdown coordination |
| Thermal diode fault detection | Automatic open/short-circuit detection on REMOTE1/2 pins; sets corresponding temperature register to 0x80 and flags status bit-prevents false thermal alerts |
| 2.5V reference output | Stable, buffered 2.5V output usable as precision reference for external ADCs or biasing circuits-eliminates need for discrete reference IC |
Applications
| Server Baseboard Management | Dual-Xeon Thermal Throttling |
|---|---|
Use Scenario: Real-time monitoring and control of power, temperature, and fan speed on enterprise-grade dual-processor server motherboards. IC Role / Device Role / Timing Role: Central hardware monitor coordinating voltage rail integrity, CPU die temperatures, and fan response via SMBus to BMC. Use Value: Enables autonomous thermal management without host OS intervention-critical for out-of-band management during boot or crash states. | Use Scenario: Dynamic adjustment of CPU cooling based on real-time core temperature and PROCHOT assertion during high-load compute cycles. IC Role / Device Role / Timing Role: Dual-zone thermal supervisor measuring CPU1/CPU2 remote diodes and asserting PROCHOT-compatible signals to throttle execution. Use Value: Prevents thermal runaway during burst workloads by triggering throttling within <100 ms monitoring cycle time-meets Intel Xeon platform requirements. |
| Multi-Processor Workstation Monitoring | Vccp-Aware Power Sequencing |
Use Scenario: High-reliability thermal and power supervision in engineering workstations with dual CPUs and multiple memory subsystems. IC Role / Device Role / Timing Role: Integrated voltage monitor for 16 rails-including DDR Vtt, MCH/ICH cores, SCSI termination-and dual remote diodes. Use Value: Consolidates discrete monitoring functions into single IC-reduces BOM count and PCB area while maintaining ±2% FS voltage accuracy. | Use Scenario: Synchronizing fan response and alert generation with dynamic CPU voltage changes during frequency scaling events. IC Role / Device Role / Timing Role: VID decoder and Vccp tracker feeding real-time core voltage data into fan control lookup tables and limit comparators. Use Value: Maintains safe thermal margins during DVFS by correlating fan speed adjustments directly with measured Vccp-not just temperature-improving efficiency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar hardware monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM87CIMT | 8-channel voltage monitor, single remote diode, no VID support, 28-pin SOIC package | Lacks dual-processor features: no PROCHOT, no Vccp monitoring, no dual tach/PWM outputs | Only suitable for single-CPU systems with simpler thermal/power requirements |
| ADM1027ARUZ | 12-channel voltage monitor, dual remote diodes, SMBus 2.0, but no VID or PROCHOT support; 24-pin TSSOP | Missing dynamic Vccp tracking and processor hot coordination-cannot replace LM93CIMT in Xeon-class platforms | Applicable where only basic voltage/temperature monitoring is needed without CPU-integrated control signals |
Compared with LM87CIMT and ADM1027ARUZ, the LM93CIMT uniquely integrates dual-processor thermal throttling (PROCHOT), dynamic Vccp tracking (6-bit VID ×2), and autonomous multi-zone fan control-making it irreplaceable in dual-Xeon server baseboard designs requiring coordinated power-thermal management.
Availability
LM93CIMT is available at Aetrix Electronics and suitable for server baseboard management, dual-processor thermal throttling, and multi-rail power monitoring applications requiring stable component supply across long-life industrial and datacenter deployments.
Supply support for LM93CIMT 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 communications markets.
The LM93CIMT belongs to TI's hardware monitor product line, engineered specifically for intelligent thermal and power management in dual-processor server platforms-supporting autonomous fan control, dynamic Vccp tracking, and out-of-band system health reporting via SMBus.
FAQ
What is the operating temperature range for the LM93CIMT?
The LM93CIMT operates from 0°C to +85°C for the IC itself, while its remote thermal diode inputs support measurement from 0°C to +125°C-enabling accurate CPU die temperature tracking in high-thermal-load server environments. This range is validated per TI's SNAS210E datasheet revision March 2013, and the internal sensor maintains ±3°C accuracy across the full operational range. The LM93CIMT must be powered within its +3.0V to +3.6V supply range to guarantee specification compliance.
How does the LM93CIMT handle −12V rail monitoring given its single-supply architecture?
The LM93CIMT requires external level-shifting circuitry for −12V monitoring: a resistor network referenced to the +3.3V standby supply offsets the negative rail into the 0–1.236V input range of AD_IN15. TI specifies a Thevenin impedance of 1–7 kΩ and provides exact resistor ratios (e.g., R1=13.7kΩ, R2=1.15kΩ for +12V; custom calculation required for −12V). The LM93CIMT does not include internal negative-rail support-this external scaling is mandatory for valid −12V readings.
Can the LM93CIMT's PWM outputs directly drive brushless fans?
No, the LM93CIMT's PWM1 and PWM2 outputs are open-drain, 3.3V-compatible signals intended to interface with external fan driver circuitry-not direct fan connection. They require pull-up resistors and external MOSFETs or dedicated fan controllers (e.g., TI DRV10983) to deliver sufficient current and voltage. The LM93CIMT provides precise duty-cycle control and thermal zone mapping, but power stage implementation remains external per design requirements.
What SMBus address options does the LM93CIMT support, and how are they selected?
The LM93CIMT supports three SMBus slave addresses-0x2C, 0x2D, and 0x2E-selected by the tri-level Address Select pin (Pin 38), which reads low, mid, or high voltage to configure the two LSBs of the 7-bit address. This allows multiple LM93CIMT devices on the same bus without address conflict, essential in quad-processor systems where two LM93CIMT units may be deployed. The interface complies fully with SMBus 2.0, supporting byte and block transfers without additional protocol translation.
Does the LM93CIMT provide hardware-level fault detection for thermal diodes?
Yes, the LM93CIMT performs automatic open-circuit and short-circuit detection on both REMOTE1 and REMOTE2 inputs prior to each temperature conversion. If a fault is detected, the corresponding temperature register is set to 0x80 and the appropriate status bit is asserted in the B_Error or H_Error registers. This hardware-level validation occurs independently of software polling and ensures robust thermal monitoring even during BMC reset or communication loss-critical for fail-safe server operation.
LM93CIMT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 56-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- Monitors
- Interface:
- 2-Wire SMBus
- Voltage - Supply:
- 3V ~ 3.6V
- Supplier Device Package:
- 56-TSSOP
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
LM93CIMT FAQ
1.How can I place an order for LM93CIMT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM93CIMT 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 LM93CIMT reliable?
The price and inventory of LM93CIMT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM93CIMT is usually 5 days.
3.What payment methods are accepted for LM93CIMT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM93CIMT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM93CIMT?
LM93CIMT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM93CIMT 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 LM93CIMT?
For technical support, including LM93CIMT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM93CIMT requirements.
6.How does Aetrix verify that LM93CIMT is sourced from the original manufacturer or authorized distributors?
All LM93CIMT 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 LM93CIMT meets industry standards.
7.What is the process for return or replacement of LM93CIMT?
All LM93CIMT units undergo pre-shipment inspection (PSI). If there is an issue with LM93CIMT, 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 LM93CIMT part is unused and in its original packaging.
Return procedure for LM93CIMT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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