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Texas Instruments LM63CIMAX
- Part No.:
- LM63CIMAX
- Manufacturer:
- Texas Instruments
- Category:
- Thermal Management
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM63CIMAX.pdf
- Description:
- IC TEMP SENSOR REMOTE 8-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,239
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Product details
Overview
LM63CIMAX from Texas Instruments is a ±1°C accurate remote diode digital temperature sensor with integrated PWM fan speed control, local/remote temperature sensing (0.125°C remote resolution), SMBus 2.0 interface, and multi-function ALERT/TACH pin - deployed in CPU/GPU thermal management systems for laptops, servers, and workstations.
For engineers reviewing the LM63CIMAX datasheet, LM63CIMAX pinout, LM63CIMAX application, or LM63CIMAX equivalent, key selection criteria include remote diode accuracy (±1°C over 60–100°C), 8-pin SOIC package compatibility with LM86, PWM fan control with 8-step lookup table, and tachometer input support for brushless fan RPM monitoring.
Technical Context
The LM63CIMAX implements a ΔVBE-based remote diode sensing architecture with factory-trimmed compensation for Intel Pentium 4/Mobile Pentium 4 thermal diodes (non-ideality factor 1.0021) and an offset register for alternate diodes. Its 10-bit plus sign ΔΣ ADC delivers 0.125°C remote resolution and 31.25 ms conversion time per cycle.
It integrates an open-drain PWM output (5 mA sink capability) driven by a user-programmable 8-step lookup table mapping remote temperature to duty cycle, plus dual-mode ALERT/TACH pin supporting either interrupt-driven thermal alerting or smart-tach RPM measurement with pulse-corruption tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Remote Temp Accuracy | ±1.0°C (60–100°C, Intel Pentium 4 diode, IPWML ≤5 mA) - enables precise CPU junction monitoring without calibration. |
| Local Temp Accuracy | ±3.0°C (25–125°C) - sufficient for ambient board-temperature tracking near processor VRMs. |
| Remote Resolution | 0.125°C (11-bit + sign format) - supports fine-grained thermal throttling thresholds. |
| PWM Output Sink | 5 mA (max) - directly drives gate of small-signal MOSFETs in fan control circuits. |
| SMBus Compatibility | SMBus 2.0 compliant, fixed 7-bit address 0x4C - ensures plug-and-play integration into existing server BMC firmware stacks. |
| Supply Range | 3.0 V to 3.6 V - matches standard 3.3 V rail with ±0.3 V tolerance, requiring only 0.1 µF + 100 pF bypassing. |
| Operating Temp | 0°C to +85°C (ambient) - validated for laptop and desktop motherboard environments. |
Pinout & Package
LM63CIMAX is housed in an 8-pin SOIC (D package), 3.9 mm × 4.9 mm body, 1.27 mm pitch, with exposed pad not electrically connected. Pin 1 marked by beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Power supply input | 3.0–3.6 V DC source; requires 0.1 µF ceramic + 100 pF ceramic bypass to GND, plus 10 µF bulk capacitance nearby. |
| D+ (Pin 2) | Analog input (diode anode) | Connects to anode of remote thermal diode; 2.2 nF capacitor required between D+ and D− for noise filtering. |
| D− (Pin 3) | Analog input (diode cathode) | Connects to cathode of remote thermal diode; forms differential pair with D+ for ΔVBE measurement. |
| PWM (Pin 4) | Open-drain digital output | Drives external N-channel MOSFET or transistor base; default low at power-on; 5 mA sink capability. |
| GND (Pin 5) | Ground reference | Common analog/digital return; must be low-impedance connection to system ground plane. |
| ALERT/TACH (Pin 6) | Multi-function I/O | User-selectable as open-drain ALERT output (active-low thermal interrupt) or tachometer input (RPM counting). |
| SMBDAT (Pin 7) | Bidirectional SMBus data | Open-drain SMBus data line; requires external pullup; supports SMBus 2.0 timing including ARA protocol. |
| SMBCLK (Pin 8) | SMBus clock input | Asynchronous clock input (10–100 kHz); device does not stretch clock; no internal pullup required. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed diode sensing | Calibrated for Intel Pentium 4/Mobile Pentium 4 thermal diodes (1.0021 non-ideality), eliminating need for system-level calibration. |
| Programmable 8-step PWM lookup table | Enables non-linear fan speed vs. temperature curves to reduce acoustic noise while maintaining thermal safety margins. |
| Smart-tach RPM measurement | Compensates for distorted tach pulses caused by PWM-driven fan transistors, ensuring reliable RPM feedback across duty cycles. |
| Multi-mode ALERT/TACH pin | Single pin serves as either thermal interrupt flag (SMBus-compatible) or tachometer input - reduces PCB routing complexity. |
| LM86-compatible pinout & registers | Drop-in replacement for LM86 in existing designs; same pin assignments, register map, and SMBus command set. |
Applications
| Processor Thermal Monitoring | GPU Thermal Management |
|---|---|
|
Use Scenario: Real-time monitoring of Intel Pentium 4/Mobile Pentium 4 processor die temperature via on-die thermal diode. IC Role / Device Role / Timing Role: Remote diode temperature sensor with factory-trimmed non-ideality compensation and 0.125°C resolution. Use Value: Enables accurate thermal throttling at ±1°C error over 60–100°C range, preventing CPU thermal runaway without host software intervention. |
Use Scenario: Active cooling control for discrete graphics processing units (GPUs) in gaming laptops and workstations. IC Role / Device Role / Timing Role: Dual-role sensor and fan controller: measures GPU diode temperature and drives PWM fan via 8-step lookup table. Use Value: Reduces acoustic fan noise by up to 15 dB(A) through programmable non-linear speed-temperature response while maintaining safe GPU junction limits. |
| Server Fan Control System | Industrial Embedded Controller |
|
Use Scenario: Multi-zone thermal supervision and fan speed regulation in 1U/2U rack-mount servers with multiple CPUs and VRMs. IC Role / Device Role / Timing Role: SMBus 2.0 slave device providing local board temperature and remote CPU/GPU diode readings to BMC. Use Value: Supports ARA (Alert Response Address) protocol for scalable interrupt handling across dozens of sensors on single SMBus segment. |
Use Scenario: Thermal protection in fan-cooled industrial PLCs, motor drives, and medical imaging equipment with long product lifecycles. IC Role / Device Role / Timing Role: Standby-capable temperature monitor with configurable hysteresis and T_CRIT alarm for fail-safe shutdown. Use Value: Maintains operation down to 0°C ambient with <300 µA standby current, enabling reliable thermal guardbanding in uncontrolled environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar remote diode temperature sensing and fan control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM86CIMX | ±2°C remote accuracy (60–100°C), 12-bit remote resolution (0.0625°C), no factory trim for Pentium 4 diodes - requires system-level calibration. | Lacks integrated PWM output; relies on external controller for fan drive - increases BOM count and layout area. | Choose when higher resolution (0.0625°C) and broader remote range (−65°C to +150°C) outweigh need for embedded fan control. |
| ADM1032ARMZ | ±1°C remote accuracy (same spec range), 11-bit resolution, SMBus 2.0 compatible, but no PWM output or tach input - pure sensor only. | No fan control capability; requires separate fan driver IC or microcontroller GPIO - adds latency and firmware overhead. | Choose when thermal monitoring is decoupled from fan actuation, e.g., in systems using dedicated fan controller ASICs. |
Compared with LM63CIMAX, LM86CIMX offers finer resolution but lacks embedded PWM control and Pentium 4-specific trim, while ADM1032ARMZ provides identical remote accuracy but no actuation capability - making LM63CIMAX uniquely suited for compact, self-contained thermal management subsystems.
Availability
LM63CIMAX is available at Aetrix Electronics and suitable for laptop thermal management, server CPU cooling, and GPU thermal monitoring requiring stable component supply and long-term lifecycle support.
Supply support for LM63CIMAX 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 specializing in analog, embedded processing, and connectivity technologies, with leadership in precision analog sensing and power management ICs.
The LM63CIMAX belongs to TI's thermal management sensor family, designed specifically for high-accuracy, low-power CPU/GPU junction temperature monitoring and closed-loop fan control in computing platforms.
FAQ
What is the remote temperature accuracy specification for LM63CIMAX?
The LM63CIMAX achieves ±1.0°C remote diode temperature accuracy over the 60°C to 100°C range when used with Intel Pentium 4 or Mobile Pentium 4 thermal diodes and load current ≤5 mA. This specification is factory-trimmed and does not require system-level calibration. The LM63CIMAX datasheet confirms this value under "DC Electrical Characteristics" with test conditions explicitly referencing the Pentium 4 diode non-ideality factor of 1.0021.
Does LM63CIMAX support tachometer input for fan speed measurement?
Yes, LM63CIMAX supports tachometer input via its multi-function ALERT/TACH pin (Pin 6). When configured in TACH mode, it measures fan RPM using smart-tach logic that compensates for pulse distortion caused by PWM-driven fan transistors. The fan counter clock frequency is 90 kHz, full-scale count is 65535, and update rate is 1.0 Hz - all confirmed in the "AC Electrical Characteristics" section of the LM63CIMAX datasheet.
Is LM63CIMAX pin-compatible with LM86?
Yes, LM63CIMAX features LM86-compatible pinout and register set, as explicitly stated in the "Features" section of the LM63CIMAX datasheet. Pin assignments (VDD, D+, D−, PWM, GND, ALERT/TACH, SMBDAT, SMBCLK), electrical behavior, and SMBus command structure match LM86 - enabling drop-in replacement in existing layouts without PCB revision.
What is the SMBus address of LM63CIMAX?
The LM63CIMAX has a fixed 7-bit SMBus slave address of 0x4C (binary 1001100), as documented in the "SMBus Interface" section of its datasheet. This address is hardwired and cannot be modified via hardware pins or software configuration, ensuring deterministic bus arbitration in multi-device systems.
Can LM63CIMAX operate from a 3.3 V supply?
Yes, LM63CIMAX operates from a 3.0 V to 3.6 V supply, fully covering standard 3.3 V ±0.3 V rails. Its typical supply current is 1.3 mA during active conversion and drops to 300 µA in STANDBY mode. The datasheet specifies bypassing requirements: 0.1 µF ceramic + 100 pF ceramic capacitors placed close to VDD and GND pins, plus 10 µF bulk capacitance nearby.
LM63CIMAX 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
- Function:
- Fan Control, Temp Monitor
- Sensor Type:
- Internal and External
- Sensing Temperature:
- 0°C ~ 125°C
- Accuracy:
- ±3°C
- Topology:
- ADC (Sigma Delta), Comparator, Fan Speed Control, Register Bank
- Output Type:
- 2-Wire SMBus
- Output Alarm:
- Yes
- Output Fan:
- Yes
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- 0°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM63CIMAX FAQ
1.How can I place an order for LM63CIMAX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM63CIMAX 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 LM63CIMAX reliable?
The price and inventory of LM63CIMAX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM63CIMAX is usually 5 days.
3.What payment methods are accepted for LM63CIMAX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM63CIMAX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM63CIMAX?
LM63CIMAX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM63CIMAX 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 LM63CIMAX?
For technical support, including LM63CIMAX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM63CIMAX requirements.
6.How does Aetrix verify that LM63CIMAX is sourced from the original manufacturer or authorized distributors?
All LM63CIMAX 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 LM63CIMAX meets industry standards.
7.What is the process for return or replacement of LM63CIMAX?
All LM63CIMAX units undergo pre-shipment inspection (PSI). If there is an issue with LM63CIMAX, 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 LM63CIMAX part is unused and in its original packaging.
Return procedure for LM63CIMAX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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