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Texas Instruments LM86CIMX/NOPB
- Part No.:
- LM86CIMX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM86CIMX/NOPB.pdf
- Description:
- SENSOR DIGITAL 0C-85C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,298
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Product details
Overview
LM86CIMX/NOPB from Texas Instruments is an 11-bit remote diode and local digital temperature sensor with SMBus 2.0 interface, ±0.75°C remote 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/NOPB datasheet, LM86CIMX/NOPB pinout, LM86CIMX/NOPB application, or LM86CIMX/NOPB equivalent, this page delivers verified technical context, real-world design meaning of specifications, validated pin functions, confirmed alternative parts, and supply-ready availability details - all grounded in TI's SNIS114E revision March 2013 documentation.
Technical Context
The LM86CIMX/NOPB implements a delta-VBE sensing architecture with separate 10-bit-plus-sign ADC paths for local die and remote diode junctions. It supports programmable offset compensation (RTOLB/RTOHB registers) to correct nonideality factors across diverse thermal diodes, including Intel Pentium III (factory-trimmed for 1.008), and provides independent HIGH/LOW/T_CRIT limit comparisons for both temperature channels.
Its SMBus 2.0 slave interface operates at up to 100 kHz with TIMEOUT reset capability (25–35 ms low hold), while ALERT and T_CRIT_A outputs are open-drain with hysteresis-controlled critical alarm behavior. The device updates all registers every 31.25 ms in round-robin conversion sequence and retains full SMBus functionality in shutdown mode (315 µA).
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 monitoring without calibration overhead |
| Local Temp Accuracy | ±3.0°C max over 25°C–125°C - sufficient for board-level ambient or IC package thermal tracking |
| Remote Resolution | 0.125°C (11-bit) - supports fine-grained fan speed control and thermal throttling decisions |
| Supply Voltage | 3.0 V to 3.6 V - compatible with standard 3.3 V logic rails and avoids level-shifting complexity |
| Quiescent Current | 0.8 mA typical at 16 Hz conversion rate - enables low-power thermal monitoring in always-on subsystems |
| SMBus Compatibility | Fully compliant with SMBus 2.0 protocol including ARA (Alert Response Address) - ensures interoperability in multi-sensor server management buses |
| Conversion Time | 31.25 ms per full cycle (local + remote) - defines minimum response latency for thermal event detection |
Pinout & Package
LM86CIMX/NOPB is housed in an 8-pin VSSOP package (3.0 mm × 3.0 mm, 0.65 mm pitch), optimized for space-constrained laptop and server motherboard layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Positive supply input | Must be decoupled locally; powers internal bandgap reference, ADC, and SMBus I/O - voltage range defines operating margin |
| D+ | Diode current source | Drives 160–315 µA into remote diode anode; sensitive to parasitic leakage - requires short trace routing |
| D− | Diode return sink | Completes remote diode bias path; voltage drop ≤0.7 V limits cathode-side PCB resistance impact |
| T_CRIT_A | Critical temperature alarm output | Open-drain active-low signal with built-in hysteresis - directly drives power-down logic or PMIC shutdown input |
| GND | Power ground reference | Shared return for analog and digital sections; must connect to low-impedance system ground plane |
| ALERT | Configurable alert output | Open-drain output supporting comparator, interrupt, or SMBus ARA modes - requires external pull-up resistor |
| SMBData | SMBus bidirectional data line | Open-drain I/O; interfaces with host controller using SMBus packet protocols - shares bus with other sensors |
| SMBCLK | SMBus clock input | Asynchronous master-driven clock; no clock stretching supported - timing must meet tLOW/tHIGH min/max specs |
Key Features
| Feature | Design Value |
|---|---|
| Offset register (RTOLB/RTOHB) | Enables accurate remote sensing of non-Pentium diodes (e.g., ASICs, discrete transistors) without firmware recalibration |
| T_CRIT_A with hysteresis | Prevents thermal oscillation during critical overtemperature events by holding alarm until temperature falls below (T_CRIT − TH) |
| Three ALERT operating modes | Supports standalone comparator use, interrupt-driven polling, or SMBus ARA protocol - eliminates need for custom driver logic |
| Diode fault detection | Automatically flags open-circuit (D+ floating/shorted to VDD) or short-circuit (D+ to GND/D−) conditions via OPEN bit and saturated register values |
| Shutdown mode (315 µA) | Reduces power in idle states while preserving SMBus addressability - enables background thermal polling without system wake |
Applications
| Laptop CPU Thermal Monitoring | Server Blade Temperature Management |
|---|---|
|
Use Scenario: Real-time die temperature tracking of mobile Intel processors using integrated thermal diode. IC Role / Device Role / Timing Role: Remote diode sensor with factory-trimmed 1.008 nonideality factor; reads temperature every 31.25 ms and asserts T_CRIT_A if >85°C. Use Value: Enables dynamic fan control and OS-level throttling before thermal throttling or shutdown occurs - meets Intel Mobile Platform Thermal Framework requirements. |
Use Scenario: Distributed thermal supervision across dual-socket Xeon-based server blades with multiple ASICs. IC Role / Device Role / Timing Role: Local + remote sensor on each blade; communicates via shared SMBus with BMC; uses ARA protocol to resolve concurrent alerts. Use Value: Eliminates polling overhead and guarantees deterministic alert prioritization in dense rack environments - reduces BMC firmware complexity. |
| Industrial PC Fan Control | Network Switch ASIC Thermal Protection |
|
Use Scenario: Closed-loop fan speed regulation based on CPU and ambient board temperature in fanless-to-fan-cooled transition zones. IC Role / Device Role / Timing Role: Dual-input sensor feeding PID controller; local reading monitors enclosure air, remote reading tracks processor junction. Use Value: Achieves acoustic optimization and extended component life by avoiding unnecessary high-RPM operation - leverages ±0.75°C remote accuracy for stable setpoint tracking. |
Use Scenario: Protecting high-power Ethernet switch ASICs (e.g., Broadcom Tomahawk) from thermal runaway during traffic bursts. IC Role / Device Role / Timing Role: Remote diode sensor bonded to ASIC package; triggers hardware-level power reduction via T_CRIT_A before software intervention. Use Value: Prevents permanent silicon damage by activating hard thermal shutdown within <100 ms of critical threshold breach - bypasses OS/software latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar remote/local temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM1032ARQZ | Pin- and register-compatible; same 8-pin MSOP package; ±1.0°C remote accuracy (worse than LM86CIMX/NOPB's ±0.75°C at key operating points) | Lacks T_CRIT_A dedicated output - relies on ALERT pin for critical alarms, requiring additional logic for hysteresis | Select when legacy ADM1032 footprint reuse is required and tighter remote accuracy is not critical |
| MAX6657ESA+ | Same 8-pin SOIC package; ±2.0°C remote accuracy over wider ambient range; no factory trim for Pentium diodes | Requires external offset calibration for mobile CPU diodes; no ARA support - limits scalability in multi-sensor SMBus systems | Select for cost-sensitive industrial applications where absolute accuracy is secondary to basic thermal alerting |
Compared with ADM1032ARQZ and MAX6657ESA+, the LM86CIMX/NOPB delivers superior remote accuracy for modern CPUs, dedicated hysteresis-controlled T_CRIT_A output, and native SMBus 2.0 ARA compliance - making it optimal for high-reliability computing thermal architectures where precision and protocol robustness are mandatory.
Availability
LM86CIMX/NOPB is available at Aetrix Electronics and suitable for laptop thermal management, server blade monitoring, and industrial PC fan control requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LM86CIMX/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, with decades of leadership in precision sensing and power management ICs.
The LM86CIMX/NOPB belongs to TI's System Monitor family, designed specifically for real-time thermal supervision in compute-intensive platforms where reliability, accuracy, and SMBus interoperability are critical.
FAQ
What is the remote temperature accuracy specification for LM86CIMX/NOPB under typical laptop operating conditions?
The LM86CIMX/NOPB achieves ±0.75°C maximum remote diode temperature accuracy when ambient temperature is 30°C and remote junction temperature is 80°C - matching the thermal profile of mobile Intel processors with 1.008 nonideality factor. This accuracy is factory-trimmed and does not require user calibration. At broader ranges (0°C–85°C ambient, 25°C–125°C remote), accuracy degrades to ±3.0°C max, as documented in TI's SNIS114E datasheet.
Does LM86CIMX/NOPB support SMBus Alert Response Address (ARA) protocol, and how is it enabled?
Yes, LM86CIMX/NOPB fully supports SMBus 2.0 ARA protocol. It responds to the general-call ARA address (0001100b) only when the ALERT configure bit (D0) in the FILTER and ALERT CONFIGURE REGISTER (xBF) is set low - which is the power-on default state. Upon successful ARA transmission, LM86CIMX/NOPB automatically sets the ALERT mask bit (D7 in Configuration register) and releases the ALERT line, enabling multi-device alert arbitration without bus lockup.
How does the T_CRIT_A output behave differently from the ALERT output on LM86CIMX/NOPB?
T_CRIT_A is a dedicated, hysteresis-controlled comparator output that activates immediately when any measured temperature exceeds its programmed T_CRIT limit and remains asserted until temperature falls below (T_CRIT − TH), where TH is the hysteresis value in the Hysteresis register. In contrast, ALERT is a configurable open-drain output that can operate as a comparator, interrupt flag, or SMBus ARA participant - but lacks built-in hysteresis and requires software configuration to select its behavior mode.
Can LM86CIMX/NOPB accurately measure temperature of non-Intel thermal diodes, and what is required?
Yes, LM86CIMX/NOPB supports non-Intel diodes via its programmable remote offset registers (RTOLB and RTOHB). These registers allow correction of nonideality factor deviations from the factory-trimmed 1.008 value - for example, compensating for discrete 2N3904 transistors or ASIC-integrated diodes. Users must determine the appropriate offset empirically or from manufacturer-provided diode characterization data, then write the 16-bit two's complement value to the offset registers.
What package options are available for LM86CIMX/NOPB, and is the VSSOP variant RoHS-compliant?
LM86CIMX/NOPB is offered exclusively in an 8-pin VSSOP package (DGS0008A) with 3.0 mm × 3.0 mm body and 0.65 mm lead pitch. The /NOPB suffix explicitly denotes lead-free (RoHS-compliant) construction, with matte tin lead finish and halogen-free molding compound - verified per TI's packaging documentation and IPC-J-STD-020 moisture sensitivity level 1 rating.
LM86CIMX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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/NOPB FAQ
1.How can I place an order for LM86CIMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM86CIMX/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 LM86CIMX/NOPB reliable?
The price and inventory of LM86CIMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM86CIMX/NOPB is usually 5 days.
3.What payment methods are accepted for LM86CIMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM86CIMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM86CIMX/NOPB?
LM86CIMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM86CIMX/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 LM86CIMX/NOPB?
For technical support, including LM86CIMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM86CIMX/NOPB requirements.
6.How does Aetrix verify that LM86CIMX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM86CIMX/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 LM86CIMX/NOPB meets industry standards.
7.What is the process for return or replacement of LM86CIMX/NOPB?
All LM86CIMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM86CIMX/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 LM86CIMX/NOPB part is unused and in its original packaging.
Return procedure for LM86CIMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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