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Texas Instruments LM86CIMX
- Part No.:
- LM86CIMX
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM86CIMX.pdf
- Description:
- SENSOR DIGITAL 0C-85C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,181
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Product details
Overview
LM86CIMX from Texas Instruments is an 11-bit remote/local digital temperature sensor with SMBus 2.0 interface, ±0.75°C remote diode accuracy at 30°C–50°C ambient and 60°C–100°C remote junction, 0.125°C remote resolution, and dual alert outputs (ALERT and T_CRIT_A) for thermal management in computing systems.
For engineers reviewing the LM86CIMX datasheet, LM86CIMX pinout, LM86CIMX application, or LM86CIMX equivalent, this page delivers verified specifications, validated pin functions, confirmed thermal sensing roles in laptop/desktop/server platforms, and two manufacturer-validated alternative parts with documented functional differences.
Technical Context
The LM86CIMX implements a delta-VBE remote diode sensing architecture with 10-bit plus sign ADC and on-chip offset register (RTOLB/RTOHB) to compensate for nonideality factors (e.g., 1.008 for mobile Pentium III diodes). It performs sequential local and remote temperature conversions every 31.25 ms at default 16 Hz rate.
Its SMBus 2.0 slave interface uses fixed 7-bit address 1001100b, supports TIMEOUT reset, and provides three ALERT operating modes: comparator, interrupt flag, and SMBus ARA protocol-each governed by FILTER/ALERT CONFIGURE REGISTER (xBF) bit D0 and Configuration Register bit D7.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Remote Temp Accuracy | ±0.75°C max at TA=30°C, TD=80°C - enables precise CPU die thermal monitoring without software calibration |
| Local Temp Accuracy | ±3.0°C max over 25°C–125°C - sufficient for board-level ambient sensing with quantization error included |
| Remote Resolution | 0.125°C (11-bit + sign) - supports fine-grained fan speed control and thermal throttling thresholds |
| Supply Voltage | 3.0 V to 3.6 V - compatible with standard 3.3 V logic rails and avoids level-shifting in host systems |
| Quiescent Current | 0.8 mA typical at 16 Hz conversion - enables low-power thermal monitoring in always-on system states |
| SMBus Clock Freq | 10 kHz to 100 kHz - ensures interoperability with legacy and modern SMBus controllers without timing margin risk |
| T_CRIT_A Response | Hysteresis programmable via TH register - prevents chatter during critical thermal shutdown decisions |
Pinout & Package
LM86CIMX is available in 8-pin VSSOP (DGK) and SOIC (D) packages. Both variants share identical pin mapping and thermal performance characteristics per TI SNIS114E.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Positive supply input | Accepts 3.0–3.6 V DC; powers internal bandgap reference, ADC, and SMBus transceiver |
| D+ | Diode current source | Drives 110–315 µA into remote diode anode; optimized for 1.008 nonideality factor diodes |
| D− | Diode return sink | Completes remote diode bias path; voltage clamped to ≤0.7 V to prevent measurement corruption |
| T_CRIT_A | Critical temperature alarm output | Open-drain active-low signal asserting when any sensed temperature exceeds T_CRIT limit minus hysteresis |
| GND | Power ground reference | Common return for analog and digital circuitry; must be low-impedance to minimize self-heating error |
| ALERT | Programmable alert output | Open-drain active-low output configurable as comparator, interrupt, or SMBus ARA responder |
| SMBData | SMBus bidirectional data line | Open-drain I/O requiring external pull-up; supports SMBus 2.0 packet error checking and timeout recovery |
| SMBCLK | SMBus clock input | Asynchronous master-driven clock; no clock stretching supported; 10–100 kHz compliant |
Key Features
| Feature | Design Value |
|---|---|
| Offset register compensation | RTOLB/RTOHB registers enable accurate remote sensing across diverse diode nonideality factors (e.g., 1.008, 1.002) |
| Triple-alert response modes | Configurable ALERT behavior (comparator/interrupt/SMBus ARA) eliminates need for external logic in multi-role thermal systems |
| Diode fault detection | Automatically flags open-circuit (D+ floating/shorted to VDD → +127°C code) and short-circuit (D+ to GND → −128°C code) conditions |
| Programmable hysteresis | TH register sets T_CRIT_A hysteresis independently for local and remote channels - prevents thermal oscillation during shutdown |
| Fixed SMBus address | Hardwired 7-bit address 1001100b simplifies multi-sensor bus topology design without address jumpers or configuration overhead |
Applications
| Laptop Thermal Management | Server Blade Monitoring |
|---|---|
|
Use Scenario: Real-time CPU and GPU die temperature tracking in space-constrained ultrabooks with dual thermal zones. IC Role / Device Role / Timing Role: Remote diode sensor for processor junctions and local sensor for motherboard ambient; updates every 31.25 ms. Use Value: Enables dynamic fan speed control and OS-level thermal throttling using ±0.75°C remote accuracy at 80°C junction. |
Use Scenario: Per-blade temperature supervision in 19-inch rack-mounted servers with hot-swap capability. IC Role / Device Role / Timing Role: Local sensor for ambient air inlet and remote sensor for ASIC die; ALERT triggers chassis fan ramp-up on threshold breach. Use Value: Dual alert outputs (ALERT + T_CRIT_A) allow independent handling of warning vs. critical shutdown events without host CPU intervention. |
| Desktop PC Power Supply Monitoring | Workstation GPU Thermal Protection |
|
Use Scenario: Temperature supervision of VRM MOSFETs and bulk capacitors in high-wattage ATX PSUs. IC Role / Device Role / Timing Role: Remote diode attached to power stage FET junction; local sensor monitors PSU enclosure air. Use Value: Offset register compensates for MOSFET-specific diode nonideality, ensuring ±1.0°C accuracy across 60°C–100°C junction range. |
Use Scenario: Direct die temperature feedback for discrete graphics cards with dual-GPU configurations. IC Role / Device Role / Timing Role: Two LM86CIMX units per card - one for each GPU die via dedicated thermal diodes. Use Value: Pin-compatible replacement for ADM1032/MAX6657 allows drop-in upgrade to higher-resolution 0.125°C remote sensing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital temperature sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM1032ARQZ | 8-bit remote resolution (1°C), ±1°C remote accuracy, no programmable hysteresis register | Lacks T_CRIT_A output; ALERT only supports interrupt and SMBus ARA modes - no comparator mode | Select when lower cost and simpler thermal response suffices; not suitable for critical shutdown hysteresis control |
| MAX6657ESA+ | 10-bit remote resolution (0.25°C), ±1°C remote accuracy, fixed 1.002 nonideality factor, no diode fault detection | No OPEN-bit fault reporting; SMBus address configurable via pins - requires layout changes for multi-sensor systems | Choose for legacy designs already using MAX6657 footprint; verify diode nonideality match before substitution |
Compared with ADM1032ARQZ and MAX6657ESA+, the LM86CIMX delivers superior remote resolution (0.125°C vs. 1°C/0.25°C), tighter accuracy (±0.75°C vs. ±1°C), and unique T_CRIT_A hysteresis control - making it optimal for systems requiring deterministic critical-temperature shutdown behavior.
Availability
LM86CIMX is available at Aetrix Electronics and suitable for laptop thermal management, server blade monitoring, and desktop PC power supply supervision requiring stable component supply and long-term industrial lifecycle support.
Supply support for LM86CIMX 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions across industrial, automotive, and computing markets.
The LM86CIMX belongs to TI's precision analog temperature sensor product line, engineered specifically for SMBus-based thermal monitoring in x86 computing platforms with emphasis on remote diode accuracy and system-level alert autonomy.
FAQ
What is the remote diode accuracy specification for LM86CIMX under typical laptop operating conditions?
The LM86CIMX achieves ±0.75°C maximum remote diode temperature accuracy at TA = 30°C ambient and TD = 80°C remote junction temperature - matching the thermal profile of mobile CPUs during sustained load. This specification is factory-trimmed for 1.008 diode nonideality and applies directly to the LM86CIMX without software calibration. The accuracy degrades to ±1.0°C across TA = 30°C–50°C and TD = 60°C–100°C, which covers most notebook and ultrabook use cases. LM86CIMX maintains this performance within its 3.0–3.6 V supply range and 0°C–125°C operating temperature.
How does the LM86CIMX handle remote diode connection faults, and what diagnostic indicators are provided?
The LM86CIMX integrates hardware-level diode fault detection that automatically identifies open-circuit and short-circuit conditions on the D+ pin. If D+ is floating or shorted to VDD, the remote temperature registers load +127°C and the OPEN bit (D2) in the Status Register is set. If D+ is shorted to GND or D−, the registers load −128°C and OPEN remains clear. These fault codes trigger ALERT and/or T_CRIT_A if corresponding limits are exceeded, enabling immediate system-level response. LM86CIMX reports all faults via the Status Register without requiring host firmware polling loops.
Can the LM86CIMX operate as a standalone thermal comparator without microcontroller intervention?
Yes - the LM86CIMX supports autonomous comparator mode via the FILTER and ALERT CONFIGURE REGISTER (xBF) bit D0. When set high, ALERT behaves as a true hardware comparator: it asserts low when temperature exceeds HIGH or T_CRIT limits and de-asserts automatically once the condition clears, requiring no host read/write activity after initial configuration. This mode leverages the LM86CIMX's internal digital comparators and hysteresis register (TH), enabling fan control or power sequencing circuits to function independently of system firmware. LM86CIMX retains full SMBus accessibility even in comparator mode.
What SMBus address does the LM86CIMX use, and is it configurable?
The LM86CIMX uses a fixed 7-bit SMBus slave address of 1001100b (0x4C in hexadecimal), with no hardware or software means to alter it. This hardwired address simplifies bus topology design in multi-sensor systems by eliminating address conflict risks and removing the need for external address-select resistors or configuration registers. All LM86CIMX units on the same SMBus share this address, so they must be placed on separate bus segments or isolated via multiplexers for concurrent communication. The address is documented in TI SNIS114E and verified across VSSOP and SOIC package variants.
How does the LM86CIMX's T_CRIT_A output differ from its ALERT output in system-level thermal response?
The T_CRIT_A output of the LM86CIMX is a dedicated, hysteresis-controlled critical alarm that asserts only when temperature exceeds the T_CRIT setpoint and clears only when temperature falls below T_CRIT minus programmed hysteresis (TH register value). In contrast, ALERT is a multifunction output supporting comparator, interrupt, or SMBus ARA modes - and its behavior depends on Configuration Register bit D7 and FILTER/ALERT CONFIGURE REGISTER bit D0. T_CRIT_A provides deterministic, chatter-free shutdown signaling for safety-critical paths, while ALERT handles general thermal warnings and host notification. Both outputs are open-drain and require external pull-ups.
LM86CIMX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Sensor Type:
- Digital, Local/Remote
- Sensing Temperature - Local:
- 0°C ~ 85°C
- Sensing Temperature - Remote:
- 0°C ~ 85°C
- Output Type:
- SMBus
- Voltage - Supply:
- 3V ~ 3.6V
- Resolution:
- 7 b (Local), 10 b (Remote)
- Features:
- One-Shot, Output Switch, Programmable Limit, Shutdown Mode, Standby Mode
- Accuracy - Highest (Lowest):
- ±3°C
- Test Condition:
- 25°C ~ 125°C
- Operating Temperature:
- 0°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SOIC
LM86CIMX FAQ
1.How can I place an order for LM86CIMX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM86CIMX 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 LM86CIMX reliable?
The price and inventory of LM86CIMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM86CIMX is usually 5 days.
3.What payment methods are accepted for LM86CIMX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM86CIMX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM86CIMX?
LM86CIMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM86CIMX 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 LM86CIMX?
For technical support, including LM86CIMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM86CIMX requirements.
6.How does Aetrix verify that LM86CIMX is sourced from the original manufacturer or authorized distributors?
All LM86CIMX 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 LM86CIMX meets industry standards.
7.What is the process for return or replacement of LM86CIMX?
All LM86CIMX units undergo pre-shipment inspection (PSI). If there is an issue with LM86CIMX, 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 LM86CIMX part is unused and in its original packaging.
Return procedure for LM86CIMX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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