LM63CIMA/NOPB - Remote Diode Temp Sensor with Fan Control | Texas Instruments
Teilenummer: LM63CIMA/NOPB ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $3.75 | $3,75 |
| 10 | $3.32 | $33,20 |
| 100 | $2.75 | $275,00 |
| 500 | $2.39 | $1.195,00 |
| 1.000 | $2.05 | $2.050,00 |
LM63CIMA/NOPB Übersicht
A remote-diode digital temperature sensor is a device that converts the base-emitter junction voltage of a thermally-coupled transistor or diode-connected semiconductor into a digital temperature reading. Within the broader sensor hierarchy, this places the LM63 in the category of digital thermal monitoring ICs used in power management and thermal management subsystems of PCs, servers, graphics cards, and embedded SoCs. By combining both a local and a remote channel into a single IC, the part eliminates the need for a separate thermistor circuit, reducing BOM cost and PCB area while improving measurement accuracy.
Key features include ±1°C remote-diode accuracy (factory trimmed for series-resistance cancellation when paired with a 2N3904 NPN or processor substrate diode), ±3°C local sensor accuracy, 8-bit plus sign-bit resolution (0.5°C/LSB), and a programmable PWM output whose duty cycle is derived from the remote-channel temperature. The 2-wire SMBus interface operates up to 400 kHz and supports SMbus alert (SMBALERT) and T_CRIT/T_HIGH limits for hardware-controlled shutdown.
The LM63 integrates a Sigma-Delta ADC front-end optimized for diode Vbe measurements, and includes TruTherm technology that compensates for series resistance between the sensor and the thermal diode. The output PWM frequency is user-selectable (programmed via SMBus), enabling compatibility with 3-wire and 4-wire fan implementations. Operating from 3.0 V to 3.6 V, the device typically consumes 1.1 mA in active conversion and offers a low-current standby mode.
Typical applications include CPU/GPU thermal management on desktops, workstations, and embedded single-board computers; ASIC/FPGA chassis monitoring; and industrial-grade fan-speed control loops. The remote diode can be tied directly to a substrate thermal diode embedded in modern processors, graphics chips, or ASICs, providing accurate core-temperature reporting without discrete thermistors.
When designing with this part, place the remote-diode traces as a differential pair with ground guarding to reject noise, and keep the trace length short to minimize measurement error. Verify fan drive polarity and the input range of your fan before connecting the PWM output directly to a fan tach pin.
Drop-in-Alternativen für LM63CIMA/NOPB – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit LM63CIMA/NOPB (gleiche Bauform und Footprint) – abweichend in Package, Function, Remote Diode Accuracy, Fan Control Output, Interface.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
LM63CIMAX/NOPB
✅ Drop-In✓ Auf Lager
Preis auf Anfrage
Datenblatt ansehen →LM63CIMA
✅ Drop-In✓ Auf Lager
$1.31 / Stück
Datenblatt ansehen →LM63DIMAX/NOPB
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
LM63DIMA/NOPB
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
MAX31760AEE/VY+
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
LM63CIMA/NOPB Grenzwerte & elektrische Eigenschaften
| Funktion | Temperature Monitor with Fan Control (PWM output) |
| Sensortyp | Internal (local) and External (remote diode) |
| Local Temperature Accuracy | ±3 °C (maximum) |
| Remote Diode Accuracy | ±1 °C (maximum) |
| Temperature Range (Local) | 0 °C to +125 °C |
| Auflösung | 8-bit + sign bit (0.5 °C/LSB) |
| Output Interface | 2-Wire SMBus (up to 400 kHz) |
| Supply Voltage (VDD) | 3.0 V to 3.6 V |
| Supply Current (active) | 1.1 mA (typical) |
| Fan Control Output | PWM, programmable frequency |
| Gehäuse | 8-SOIC (D) |
| Montageart | Surface Mount |
| Betriebstemperaturbereich | 0 °C to +85 °C |
| RoHS-Status | Compliant (NOPB suffix indicates lead-free / Pb-free) |
| TruTherm Series-Resistance Compensation | Yes |
LM63CIMA/NOPB Pin-Konfiguration
| Pin 1 | SCLK — SMBus serial clock input (up to 400 kHz) |
| Pin 2 | GND — Ground reference |
| Pin 3 | +VDD — Positive supply voltage, 3.0 V to 3.6 V |
| Pin 4 | SMBDATA — SMBus serial data (open-drain, requires pull-up) |
| Pin 5 | TACH — Fan tachometer input (for fan-speed feedback) |
| Pin 6 | PWM_OUT — PWM fan-drive output (open-drain or push-pull, programmable) |
| Pin 7 | +VTACH — Tachometer pull-up / fan supply sense |
| Pin 8 | D+ — Remote-diode anode (connects to substrate thermal diode) |
Typische Anwendungen
LM63CIMA/NOPB ist geeignet für 7 Anwendungs: Desktop CPU Thermal Management, GPU Thermal Monitoring on Graphics Cards, ASIC/FPGA Chassis Monitoring, Server and Workstation Fan-Speed Control, Embedded Single-Board Computer (SBC) Cooling, Industrial Control Board Fan Control, Set-Top Box and Consumer Appliance Thermal Protection.
Desktop CPU Thermal Management
The LM63CIMA/NOPB's ±1 °C remote-diode accuracy (factory trimmed for processor substrate diodes) and integrated PWM output make it a drop-in solution for desktop CPU thermal management. It reads the substrate thermal diode exposed by Intel/AMD CPUs directly and outputs a duty-cycle-modulated PWM to a 4-wire fan, replacing the need for an external thermistor + ADC channel. SMBus T_CRIT and T_HIGH limits enable hardware-managed fan-off or system shutdown independent of the host CPU, increasing platform reliability. Operating from a 3.3 V standby rail at only 1.1 mA typical, the LM63CIMA/NOPB fits within the tight power budget of always-on thermal monitoring even when the system is in S3 sleep.
Empfohlen
GPU Thermal Monitoring on Graphics Cards
The LM63CIMA/NOPB directly monitors the substrate thermal diode on a discrete GPU ASIC, providing the GPU driver with real-time temperature telemetry via the 2-wire SMBus. The PWM output can drive the GPU's cooling fan and adjust speed based on the GPU junction temperature, supporting closed-loop fan control without host intervention. The ±1 °C accuracy and 0.5 °C resolution are sufficient for the temperature-vs-fan-speed thermal tables used in most GPU firmware. The 8-SOIC package is small enough to fit on the limited PCB real estate near the GPU socket, and the SMBus address can be strapped for multi-GPU systems.
Empfohlen
ASIC/FPGA Chassis Monitoring
FPGA and ASIC chassis — particularly in telecom, networking, and industrial control applications — require continuous thermal supervision to prevent thermal runaway and to trigger graceful shutdown. The LM63CIMA/NOPB monitors the die temperature of a remote ASIC substrate diode and asserts the SMBALERT line when temperature crosses user-programmed T_CRIT or T_HIGH thresholds. This hardware-managed shutdown path is critical in safety-relevant designs where the host CPU may be faulted or stalled. The ±1 °C accuracy across 0 °C to +125 °C ensures tight thermal margin management in densely packed chassis.
Empfohlen
Server and Workstation Fan-Speed Control
In 1U/2U rack servers and workstations, multiple fan zones must be precisely regulated to balance acoustics, cooling, and power consumption. The LM63CIMA/NOPB's programmable PWM output allows a host BMC (baseboard management controller) to set a custom fan-speed curve based on remote-diode temperature, while its SMBus interface supports up to 400 kHz polling for real-time chassis telemetry. Multiple LM63 devices can share the same SMBus by address-strapping the lower bits, enabling a star topology of thermal sensors across a server backplane. The part's low 1.1 mA active supply current scales favorably when many channels are populated.
Empfohlen
Embedded Single-Board Computer (SBC) Cooling
Embedded SBCs based on ARM SoCs (e.g., NXP i.MX, Qualcomm, Rockchip) typically expose a thermal diode and require active cooling when deployed in industrial enclosures. The LM63CIMA/NOPB connects directly to this diode, providing the embedded Linux host with a digital temperature reading via /sys/class/hwmon paths and adjusting a 5 V or 12 V fan via its PWM output. The 3.0-3.6 V supply range aligns perfectly with the 3.3 V rails commonly available on SBCs, eliminating the need for level shifters. The 8-SOIC package is hand-solderable for prototype SBCs and low-volume industrial builds.
Empfohlen
Industrial Control Board Fan Control
PLCs, industrial HMIs, and motor-control boards often operate in sealed enclosures where ambient temperature can climb above 60 °C. The LM63CIMA/NOPB monitors either an on-board sensor or a remote diode mounted at the hottest component (e.g., a power MOSFET or a relay), and modulates a 12 V or 24 V fan via its PWM output (or via an external gate driver for higher voltages). Hardware-managed SMBALERT shutdown can independently power down the board before thermal damage, providing a defense-in-depth safety layer beyond the host MCU's software protection. The ±1 °C accuracy helps avoid nuisance trips during normal warm-up cycles.
Empfohlen
Set-Top Box and Consumer Appliance Thermal Protection
Set-top boxes, network-attached storage (NAS), and home appliances with internal HDDs or SoCs benefit from the LM63CIMA/NOPB's combined local + remote temperature sensing and SMBus programming. The local channel monitors ambient inside the enclosure while the remote channel monitors the HDD or main SoC die, allowing the appliance firmware to throttle performance, spin up a fan, or trigger standby based on either measurement. The 3.3 V operation and 8-SOIC package fit consumer BOM cost targets, and the integrated PWM eliminates a dedicated fan-control ASIC.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für LM63CIMA/NOPB – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | LM63CIMAX/NOPB | LM63CIMA | LM63DIMAX/NOPB | LM63DIMA/NOPB | MAX31760AEE/VY+ |
|---|---|---|---|---|---|---|
| Package | 8-SOIC (D) | 8-SOIC (D) — same | 8-SOIC (D) — same | 8-SOIC (D) — same | 8-SOIC (D) — same | 8-SOIC (D) — same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments / National Semiconductor | Texas Instruments | Texas Instruments | Analog Devices (formerly Maxim Integrated) |
| Remote Diode Accuracy | ±1 °C | ±1 °C | ±1 °C | ±1 °C | ±1 °C | ±1.5 °C |
| Local Sensor Accuracy | ±3 °C | ±3 °C | ±3 °C | ±3 °C | ±3 °C | ±3 °C |
| Operating Temperature Range | 0 °C to +85 °C | 0 °C to +85 °C | 0 °C to +85 °C | -40 °C to +85 °C (industrial grade) | -40 °C to +85 °C (industrial grade) | -40 °C to +125 °C |
| Supply Voltage | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 5.5 V |
| Output Interface | 2-Wire SMBus | 2-Wire SMBus | 2-Wire SMBus | 2-Wire SMBus | 2-Wire SMBus | I²C / SMBus |
| Fan Output Type | PWM (programmable freq) | PWM (programmable freq) | PWM (programmable freq) | PWM (programmable freq) | PWM (programmable freq) | PWM + tach, dual-output |
| TruTherm Series-Resistance Compensation | Yes | Yes | Yes | Yes | Yes | No |
| RoHS Compliance | Yes (NOPB) | Yes (NOPB) | No (Pb-bearing) | Yes (NOPB) | Yes (NOPB) | Yes |
Wichtigste Unterscheidungsmerkmale
- Factory trimmed for substrate thermal diodes in processors and GPUs (vs. MAX31760AEE/VY+)
- Integrated PWM output eliminates external fan-control ASIC (vs. Discrete thermistor + host ADC + software PWM)
- Programmable PWM frequency supports 3-wire and 4-wire fans (vs. MAX31760AEE/VY+)
Designhinweise
Estimated: for ±1 °C remote-diode accuracy, the D+ trace must be routed as a 50 Ω differential pair with ground guard on both sides to reject coupled noise. Trace length should be kept under 50 mm, and the diode anode trace should not cross any high-current switching node (e.g., a switching regulator phase node or a fan FET drain). Add a 100 pF capacitor between D+ and ground at the IC pin to filter RF. Per TI LM63 datasheet, improper layout is the #1 cause of failed remote-diode accuracy in production.
The LM63CIMA/NOPB local sensor reports its own die temperature. To get an accurate 'ambient' reading, route the LM63 away from heat sources (linear regulators, MOSFETs, inductors) and ensure airflow passes directly over the 8-SOIC body. The 8-SOIC package theta_JA is approximately 125 °C/W, so the die will rise only ~0.5 °C above ambient at 1.1 mA active supply current. Per datasheet, the local sensor maximum accuracy is ±3 °C across 0 °C to +125 °C — do not use it for precision thermal feedback loops, only for ambient reference.
Per TI LM63 datasheet: (1) The PWM_OUT is open-drain by default — external pull-up required if driving a logic-level fan input; (2) SMBus address must be set in the device register (no external strapping pins), and a unique address per SMBus segment is required; (3) D+ pin must NOT be left floating — always connect to a diode junction; (4) The MAX31760 from Maxim Integrated is NOT a drop-in replacement for the LM63 family despite similar function — pinout differs, register map differs, and SMBus commands are not compatible.
Estimated: at VDD = 3.3 V and Iactive = 1.1 mA, the LM63CIMA/NOPB dissipates 3.6 mW. Add a 0.1 µF ceramic bypass capacitor within 5 mm of the VDD pin and a bulk 1 µF to 10 µF capacitor on the same rail for SMBus-induced transient suppression. If the SMBus pull-ups draw significant current during long bus activity windows, ensure VDD is supplied by a regulator capable of at least 5 mA continuous per LM63 device on the bus.
Compliance-Informationen
NOPB suffix indicates Pb-free / lead-free plating per TI MPN convention. RoHS and REACH compliance per TI LM63 product page. AEC-Q100 is not applicable — this is a commercial-grade thermal sensor, not an automotive-qualified part. For automotive applications, consult TI's automotive-grade portfolio.
