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Texas Instruments LM89CIMM/NOPB
- Part No.:
- LM89CIMM/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM89CIMM/NOPB.pdf
- Description:
- SENSOR DIGITAL 0C-85C 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,485
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Product details
Overview
LM89CIMM/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/80°C, 0.125°C remote resolution, and dual open-drain ALERT/T_CRIT_A outputs for thermal monitoring in CPU/GPU/FPGA systems.
For engineers reviewing the LM89CIMM/NOPB datasheet, LM89CIMM/NOPB pinout, LM89CIMM/NOPB application, or LM89CIMM/NOPB equivalent, this page delivers verified specifications, validated pin functions, confirmed thermal sensing roles in processor subsystems, and real-world alternative selection guidance for thermal management designs.
Technical Context
The LM89CIMM/NOPB implements a delta-VBE remote diode sensing architecture with programmable nonideality compensation via offset registers, supporting accurate die temperature measurement of ASICs, GPUs, and FPGAs with integrated thermal diodes. It features dual independent digital comparators for local and remote temperature limits.
Its SMBus 2.0 interface supports TIMEOUT reset, ALERT masking, and ARA (Alert Response Address) protocol compliance. The device operates at 3.0–3.6 V, draws 0.8–1.7 mA quiescent current at 16 Hz conversion rate, and completes full local + remote conversion in 31.25 ms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Remote Accuracy | ±0.75°C max at TA=30°C, TD=80°C - enables precise thermal throttling control for high-performance processors |
| Remote Resolution | 0.125°C (11-bit) - supports fine-grained temperature trend analysis and dynamic fan speed control |
| Local Accuracy | ±3.0°C max over 25–125°C - sufficient for ambient or package-level thermal supervision |
| Supply Voltage | 3.0 V to 3.6 V - compatible with standard 3.3 V system rails and low-noise auxiliary supplies |
| Conversion Time | 31.25 ms per full cycle - ensures deterministic timing for thermal interrupt response and firmware polling intervals |
| SMBus Compatibility | Fully compliant with SMBus 2.0 - guarantees interoperability with industry-standard system management controllers |
| T_CRIT Default | 85°C - matches common processor critical shutdown thresholds without register reconfiguration |
Pinout & Package
LM89CIMM/NOPB is housed in an 8-pin SOIC (D) package measuring 4.9 mm × 3.9 mm, optimized for board-level thermal sensor placement near high-power ICs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Positive supply input | Accepts 3.0–3.6 V; requires 0.1 µF + 100 pF bypass capacitors placed adjacent to pin for noise immunity |
| D+ | Diode current source | Drives remote thermal diode anode; mandates 2.2 nF capacitor placed between D+ and D− pins for high-frequency noise filtering |
| D− | Diode return sink | Completes remote diode current path; must be routed with matched trace length to D+ for measurement stability |
| T_CRIT_A | Critical temperature alarm | Open-drain active-low output with built-in hysteresis; directly drives power supply shutdown or controller interrupt lines |
| GND | Power ground reference | Common return for analog and digital sections; must connect to low-impedance system ground plane |
| ALERT | General-purpose interrupt | Open-drain active-low output supporting comparator, interrupt, or SMBus ARA modes via configuration register |
| SMBData | SMBus bidirectional data | Open-drain I/O with 5 pF input capacitance; requires external pull-up resistor for SMBus communication |
| SMBCLK | SMBus clock input | Input-only clock line; accepts 10–100 kHz SMBus 2.0 clock signals with 4.0 µs minimum high time |
Key Features
| Feature | Design Value |
|---|---|
| Offset register calibration | Compensates for diode nonideality (e.g., 1.0021 factor) without software intervention - improves remote accuracy across diverse IC dies |
| Dual independent limit comparators | Separate HIGH/LOW/T_CRIT registers for local and remote channels - enables independent thermal policies for SoC junction vs. board ambient |
| Programmable conversion rate | Adjustable via register 04h - balances power consumption (0.8–1.7 mA) against thermal update frequency in battery-sensitive applications |
| ALERT mode flexibility | Configurable as hardware comparator, interrupt flag, or SMBus ARA responder - eliminates need for external logic in multi-device thermal networks |
| Shutdown mode | Reduces current to 315 µA while retaining SMBus addressability - allows background thermal monitoring during system sleep states |
Applications
| Laptop CPU Thermal Management | Server GPU Rack Monitoring |
|---|---|
Use Scenario: Real-time die temperature tracking of Intel Core or AMD Ryzen CPUs during sustained workloads. IC Role / Device Role / Timing Role: Remote diode sensor interfacing with CPU's on-die thermal diode; provides 31.25 ms periodic updates to EC or BMC. Use Value: Enables dynamic voltage/frequency scaling (DVFS) and fan control with ±0.75°C accuracy - prevents thermal throttling instability and extends processor lifespan. | Use Scenario: Multi-GPU thermal supervision in AI training servers where NVIDIA A100 or AMD MI250X die temperatures must stay below 95°C. IC Role / Device Role / Timing Role: Local + remote sensor co-located with GPU modules; T_CRIT_A triggers immediate power-down if any GPU exceeds 85°C threshold. Use Value: Prevents catastrophic GPU failure by enforcing hard thermal limits with hysteresis-controlled shutdown - avoids false triggers from transient spikes. |
| Industrial FPGA-Based Vision System | Network Switch ASIC Thermal Control |
Use Scenario: Xilinx Kria or Intel Agilex FPGA junction temperature monitoring in edge inference cameras operating at 60°C ambient. IC Role / Device Role / Timing Role: Remote diode sensor connected to FPGA's thermal diode; ALERT asserts when local board temperature exceeds 70°C. Use Value: Maintains stable FPGA timing margins by initiating forced air cooling before silicon derating occurs - preserves real-time image processing latency. | Use Scenario: Broadcom Tomahawk or Marvell Prestera switch ASIC thermal guardbanding in 5G transport equipment. IC Role / Device Role / Timing Role: Dual-sensor node reporting both ASIC die (remote) and PCB hotspot (local) temperatures via single SMBus address. Use Value: Reduces BOM count by consolidating two thermal sensors into one IC - simplifies layout and firmware while meeting NEBS GR-63-CORE reliability requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar remote diode temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM90CIMM/NOPB | Higher remote accuracy (±0.5°C), 12-bit remote resolution, same SOIC-8 package and SMBus interface | Required for applications demanding tighter thermal control bands (e.g., high-end server CPUs) | Select when ±0.5°C remote accuracy is mandatory and cost premium is acceptable |
| MAX6657ESA+ | Different SMBus slave address (1001100b vs. LM89CIMM/NOPB's 1001100b - identical), but no T_CRIT_A output; only ALERT pin | Lacks dedicated critical shutdown output - requires external logic for hardware-initiated power-off | Choose only if existing design uses MAX6657 and SMBus address collision is avoided |
Compared with LM90CIMM/NOPB, LM89CIMM/NOPB trades 0.25°C remote accuracy for lower cost and proven field reliability in mainstream computing platforms; versus MAX6657ESA+, it adds T_CRIT_A for autonomous shutdown - eliminating firmware dependency for safety-critical thermal events.
Availability
LM89CIMM/NOPB is available at Aetrix Electronics and suitable for laptop thermal management, server GPU monitoring, and industrial FPGA-based vision systems requiring stable component supply and long-term lifecycle support.
Supply support for LM89CIMM/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 over 50 years of innovation in precision sensing and power management.
The LM89CIMM/NOPB belongs to TI's precision temperature sensor product line, engineered specifically for high-accuracy remote diode monitoring in compute-intensive systems where processor die temperature must be controlled within tight thermal envelopes.
FAQ
What is the remote diode accuracy specification for LM89CIMM/NOPB?
The LM89CIMM/NOPB achieves ±0.75°C maximum remote diode temperature accuracy at TA = 30°C and TD = 80°C, as specified in the official Texas Instruments datasheet SNIS128D. This accuracy applies to thermal diodes with typical nonideality factors (e.g., 1.0021) and series resistance up to 3.64 Ω. The LM89CIMM/NOPB uses an offset register to calibrate out nonideality errors, ensuring consistent performance across different processor dies.
Does LM89CIMM/NOPB support SMBus 2.0 TIMEOUT reset functionality?
Yes, LM89CIMM/NOPB fully supports SMBus 2.0 TIMEOUT reset: holding SMBData and/or SMBCLK low for longer than 25–35 ms resets the internal SMBus state machine and places SMBData/SMBCLK pins in high-impedance mode. This feature is documented in Section 8.8 of the SNIS128D datasheet and enables robust bus recovery in noisy industrial environments without requiring device power cycling.
What is the default T_CRIT temperature setting for LM89CIMM/NOPB?
The LM89CIMM/NOPB has a default local T_CRIT temperature setting of 85°C, as confirmed in the Device Comparison Table (Section 6) of the SNIS128D datasheet. This value is loaded at power-on and corresponds to the LM89C/LM89CIMM variant family. The remote T_CRIT default is 110°C. Both values are user-programmable via the T_CRIT limit registers (addresses 20h–21h for local, 22h–23h for remote).
Can LM89CIMM/NOPB measure both local and remote temperatures simultaneously?
Yes, LM89CIMM/NOPB performs sequential local and remote temperature conversions in a round-robin manner, completing both measurements every 31.25 ms. The device maintains separate 8-bit local and 11-bit remote temperature registers (addresses 00h–01h and 03h–04h), allowing firmware to read either value independently at any time. The conversion sequence is deterministic and unaffected by SMBus traffic, ensuring predictable thermal update timing for real-time control loops.
What package type and dimensions does LM89CIMM/NOPB use?
LM89CIMM/NOPB is supplied in an 8-pin SOIC (D) package with nominal body size 4.9 mm × 3.9 mm, as specified in the Device Information table (Section 4) of the SNIS128D datasheet. This surface-mount package is RoHS-compliant and pin-compatible with other LM89 variants including LM89-1CIMM and LM89-1DIMM, enabling drop-in replacement within the same footprint when thermal thresholds align.
LM89CIMM/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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-VSSOP
LM89CIMM/NOPB FAQ
1.How can I place an order for LM89CIMM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM89CIMM/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 LM89CIMM/NOPB reliable?
The price and inventory of LM89CIMM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM89CIMM/NOPB is usually 5 days.
3.What payment methods are accepted for LM89CIMM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM89CIMM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM89CIMM/NOPB?
LM89CIMM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM89CIMM/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 LM89CIMM/NOPB?
For technical support, including LM89CIMM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM89CIMM/NOPB requirements.
6.How does Aetrix verify that LM89CIMM/NOPB is sourced from the original manufacturer or authorized distributors?
All LM89CIMM/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 LM89CIMM/NOPB meets industry standards.
7.What is the process for return or replacement of LM89CIMM/NOPB?
All LM89CIMM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM89CIMM/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 LM89CIMM/NOPB part is unused and in its original packaging.
Return procedure for LM89CIMM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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