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Texas Instruments LM93CIMTX
- Part No.:
- LM93CIMTX
- Manufacturer:
- Texas Instruments
- Category:
- Specialized
- Package:
- 56-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
LM93CIMTX.pdf
- Description:
- IC INTERFACE SPECIALIZED 56TSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM93CIMTX 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), on-die ambient temperature measurement, two PWM fan control outputs, four tachometer inputs, and SMBus 2.0 interface - all in a single 56-pin TSSOP package.
For engineers reviewing the LM93CIMTX datasheet, LM93CIMTX pinout, LM93CIMTX application, or LM93CIMTX equivalent, this device supports precise thermal throttling (PROCHOT), dynamic VID monitoring, autonomous fan control via 13-step lookup tables, and real-time power supply fault detection in Xeon-class server baseboards.
Technical Context
The LM93CIMTX implements an 8-bit ΣΔ ADC with inherent averaging (1.5 ms for voltage, 8.4 ms for temperature), enabling stable measurements amid noise-prone server environments. It performs independent PROCHOT and dynamic VID monitoring outside the main 100-ms analog/temperature cycle.
Temperature data is delivered as 8-bit two's-complement values (1°C LSB) from three sources: Zone 1 (REMOTE1+/-), Zone 2 (REMOTE2+/-), and Zone 3 (on-chip sensor); Zone 4 accepts externally written digital temperature values via SMBus for flexible fan control logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Monitoring Channels | 16 analog inputs including ±12V (with external scaling), +3.3V SB, +5V, Vccp1/Vccp2, FSB_Vtt, Mem_Core, SCSI_Core - each with dedicated limit registers and status flags. |
| Temperature Sensing | Three physical sources: two remote diodes (CPU1/CPU2), one internal die sensor; resolution 1.0°C; accuracy ±3°C max over 0°C to +85°C operating range. |
| Fan Control | Two open-drain PWM outputs (PWM1/PWM2), each programmable via 13-step lookup table using up to four temperature zones; includes fan boost and digital filter for smoothed readings. |
| Interface & Addressing | SMBus 2.0 compliant (Byte/Block Read/Write); tri-level Address Select pin enables selection of one of three slave addresses (0x2C, 0x2D, 0x2E). |
| Power Supply | +3.0V to +3.6V operation; 0.9 mA typical supply current; 2.5V reference output (VREF) usable for external circuitry or ADC calibration. |
| Package & Environment | 56-pin TSSOP (Package DGG0056A); operates from 0°C to +85°C ambient; remote diode sensing supports −55°C to +125°C junction range. |
Pinout & Package
LM93CIMTX is housed in a 56-pin Thin Shrink Small Outline Package (TSSOP), thermally optimized for high-density server motherboard layouts and compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GPIO_0/TACH1 – GPIO_3/TACH4 (Pins 1–4) | Fan tachometer input / general-purpose I/O | Configurable open-drain inputs supporting four independent fan speed measurements or GPIO functions; internally debounced for reliable RPM capture. |
| REMOTE1+/−, REMOTE2+/− (Pins 19–22) | Remote thermal diode interface | Dedicated current-source (+) and current-sink (−) pairs for direct connection to Xeon processor thermal diodes (THERMDA/THERMDC) or discrete MMBT3904 transistors. |
| PWM1, PWM2 (Pins 41–42) | Fan speed control outputs | Open-drain PWM signals driving external MOSFETs or fan controllers; duty cycle determined by zone-based lookup table and digital temperature filter. |
| P1_PROCHOT, P2_PROCHOT (Pins 49–50) | Processor hot signal interface | Bidirectional open-drain lines connected to CPU1/CPU2 PROCHOT# pins via level shifter; enable hardware-initiated thermal throttling without host intervention. |
| AD_IN1–AD_IN16 (Pins 23–37, 39) | Analog voltage monitoring inputs | 16 differential-capable analog inputs; eight include internal scaling resistors; ±12V channels require external resistor dividers (R1=13.7kΩ/R2=1.15kΩ recommended). |
| SMBDAT, SMBCLK (Pins 13–14) | SMBus 2.0 interface | 5V-tolerant open-drain data/clock lines supporting Byte and Block transfers; compatible with standard BMC or service processor communication protocols. |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous fan control | Programmable 13-step lookup table per PWM output, using up to four temperature zones (Zones 1–4) and optional fan boost - eliminates host CPU polling overhead. |
| Dual dynamic VID monitoring | Simultaneous tracking of six VID bits per processor (P1_VID0–P1_VID5, P2_VID0–P2_VID5) to derive real-time Vccp voltage and detect VRD state transitions. |
| Thermal diode fault detection | Automatic open/short-circuit detection on REMOTE1+/− and REMOTE2+/−; faults set corresponding temperature register to 0x80 and assert status bits in error registers. |
| PROCHOT and VRD_HOT monitoring | Dual independent PROCHOT inputs (P1/P2) plus VRD1_HOT/VRD2_HOT digital inputs allow coordinated thermal response across both CPUs and their voltage regulators. |
| XOR-tree test mode | On-chip diagnostic mode accessible via ALERT/XtestOut pin (Pin 15); verifies internal logic paths and register integrity during manufacturing or field validation. |
Applications
| Dual-Processor Server Management | Workstation Thermal Safety System |
|---|---|
Use Scenario: Real-time monitoring of two Xeon processors, their Vccp supplies, memory rails, and cooling subsystems on a high-density ATX or SSI-CEB motherboard. IC Role / Device Role / Timing Role: Central hardware monitor coordinating voltage fault detection, thermal throttling (PROCHOT), and PWM fan speed based on remote diode readings and internal die temperature. Use Value: Enables autonomous thermal response within <100 ms monitoring cycle time, reducing BMC firmware complexity and improving system reliability under transient load conditions. |
Use Scenario: Preventing thermal runaway in multi-GPU professional workstations where CPU and GPU diodes are monitored alongside PCIe slot voltages and memory Vtt. IC Role / Device Role / Timing Role: Voltage and temperature supervisor providing alert-driven error reporting (via SMBus ALERT#) and masking non-critical faults (e.g., SCSI termination loss) using GPIO_4/GPIO_5 as THERMTRIP inputs. Use Value: Supports fail-safe shutdown sequencing by asserting RESET# (Pin 16) on critical overtemperature or undervoltage events, preserving data integrity during power anomalies. |
| Multi-Microprocessor Equipment Baseboard | Server BMC Co-Processor Interface |
Use Scenario: Managing quad-processor systems using two LM93CIMTX devices - one per CPU pair - with synchronized SMBus addressing and shared fan control logic. IC Role / Device Role / Timing Role: Scalable monitoring node delivering consolidated voltage, temperature, and fan status registers to BMC via SMBus Block Read operations. Use Value: Reduces BMC polling frequency by >60% through interrupt-driven ALERT# signaling and pre-processed zone-based fan decisions - lowering bus traffic and latency. |
Use Scenario: Serving as the primary analog front-end for a baseboard management controller (BMC) in rack-mounted servers, feeding telemetry to IPMI-compliant firmware. IC Role / Device Role / Timing Role: SMBus slave device providing calibrated 8-bit temperature and voltage values, limit violation status, and tachometer counts - all mapped to standard IPMI sensor record formats. Use Value: Eliminates need for external ADCs or discrete comparators; simplifies BOM and layout while ensuring traceable, factory-calibrated measurements per JEDEC JESD57. |
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 PROCHOT or VID support; 28-pin TSSOP; lacks PWM outputs and tachometer inputs. | Targeted at single-CPU desktop or embedded systems - insufficient for dual-Xeon thermal management or autonomous fan control. | Select LM87CIMT only when cost-sensitive designs require basic voltage/temp supervision without server-grade features. |
| ADM1027ASTZ | 12-channel monitor, dual remote diodes, SMBus 2.0, but no PROCHOT, no VID decoding, and only one PWM output; uses 48-pin LFCSP package. | Used in blade servers with centralized fan control; requires external logic for dual-processor PROCHOT coordination. | Choose ADM1027ASTZ if compact footprint and lower thermal resistance are prioritized over integrated dual-PROCHOT and VID functionality. |
Compared with LM87CIMT and ADM1027ASTZ, the LM93CIMTX uniquely integrates dual-processor PROCHOT monitoring, six-bit VID decoding per CPU, two independent PWM fan controllers, and full 16-channel voltage supervision - making it the only option for Xeon-class server baseboards requiring autonomous, hardware-based thermal and power management.
Availability
LM93CIMTX is available at Aetrix Electronics and suitable for dual-processor server management, workstation thermal safety systems, and multi-microprocessor equipment baseboards requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM93CIMTX 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 analog ICs for industrial and computing infrastructure.
The LM93CIMTX belongs to TI's hardware monitor product line, engineered specifically for high-reliability server and workstation baseboard management - emphasizing autonomous thermal response, multi-rail voltage supervision, and seamless integration with BMC and IPMI ecosystems.
FAQ
What is the operating temperature range for the LM93CIMTX?
The LM93CIMTX operates from 0°C to +85°C ambient temperature. Its remote diode inputs support junction temperature measurements from −55°C to +125°C, and the internal die sensor provides ambient readings with ±3°C accuracy across the full operational range. This makes the LM93CIMTX suitable for thermally demanding server chassis environments where airflow and localized heating vary significantly.
How does the LM93CIMTX handle −12V monitoring given its single-supply architecture?
The LM93CIMTX requires external level-shifting circuitry for −12V monitoring: a resistor divider referenced to the +3.3V standby rail (AD_IN16) offsets the negative input into the 0–1.236V valid range. The recommended design uses R1=13.7 kΩ and R2=1.15 kΩ, yielding a Thevenin resistance within the 1–7 kΩ spec. The LM93CIMTX then converts the scaled voltage with 8-bit resolution and compares it against programmable limits - no internal negative rail is needed.
Can the LM93CIMTX control fans autonomously without host processor intervention?
Yes, the LM93CIMTX supports fully autonomous fan control using its dual PWM outputs (PWM1/PWM2), each driven by a 13-step lookup table referencing up to four temperature zones (Zones 1–4). The internal digital temperature filter smooths readings, and fan boost can be triggered by rapid temperature rise - all implemented in hardware. This allows the LM93CIMTX to maintain safe thermal margins even during host firmware hangs or BMC resets.
What is the function of the Address Select pin on the LM93CIMTX?
Address Select (Pin 38) is a tri-level analog input that sets the two LSBs of the LM93CIMTX's SMBus slave address: grounded = 0x2C, open = 0x2D, pulled to VDD = 0x2E. This enables up to three LM93CIMTX devices on the same SMBus segment - essential for quad-processor systems or complex backplanes where multiple monitoring nodes share a single bus without address conflict.
Does the LM93CIMTX support both SMBus 1.1 and SMBus 2.0 protocols?
The LM93CIMTX is explicitly SMBus 2.0 compliant, supporting Byte Read/Write, Block Read/Write, and Process Call commands. It does not implement SMBus Alert Response Protocol or Host Notify, and its SMBDAT/SMBCLK pins are 5V-tolerant open-drain interfaces. While backward-compatible with SMBus 1.1 masters for basic Byte operations, full Block Read/Write and enhanced error handling require SMBus 2.0–capable BMC or controller firmware.
LM93CIMTX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 56-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
LM93CIMTX FAQ
1.How can I place an order for LM93CIMTX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM93CIMTX 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 LM93CIMTX reliable?
The price and inventory of LM93CIMTX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM93CIMTX is usually 5 days.
3.What payment methods are accepted for LM93CIMTX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM93CIMTX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM93CIMTX?
LM93CIMTX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM93CIMTX 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 LM93CIMTX?
For technical support, including LM93CIMTX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM93CIMTX requirements.
6.How does Aetrix verify that LM93CIMTX is sourced from the original manufacturer or authorized distributors?
All LM93CIMTX 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 LM93CIMTX meets industry standards.
7.What is the process for return or replacement of LM93CIMTX?
All LM93CIMTX units undergo pre-shipment inspection (PSI). If there is an issue with LM93CIMTX, 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 LM93CIMTX part is unused and in its original packaging.
Return procedure for LM93CIMTX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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