TMP411EDGKR - ±1°C Remote/Local Temp Sensor | Texas Instruments
MPN: TMP411EDGKR ✓ פעילTMP411EDGKR סקירה
A remote digital temperature sensor measures the junction temperature of an external diode-connected transistor - typically a low-cost NPN or PNP device that is already integrated inside a microcontroller, microprocessor, or FPGA. Together with its built-in local channel, the device forms a complete thermal-monitoring subsystem within the broader hierarchy of board-mount temperature sensors and system-management ICs, communicating results over an SMBus/I2C two-wire interface.
Key features include ±1°C remote channel accuracy and ±1°C local channel accuracy for multiple device temperatures, a wide supply range of 2.7V to 5.5V, programmable N-factor correction that accommodates different transistor process characteristics, and series-resistance cancellation that removes the error introduced by PCB trace resistance in the D+/D- path. The 12-bit conversion result gives approximately 0.0625°C resolution on the remote channel.
Architecture-wise, the TMP411 uses two modulated bias currents through the external sensing diode; the delta-VBE voltage is digitized by an internal ADC, and the N-factor correction register lets the device match the ideality factor of the specific processor die being monitored. The register map and pin arrangement are compatible with the Analog Devices ADT7461 and ADM1032, easing migration in existing server and networking thermal designs.
Typical applications include CPU/FPGA/GPU junction-temperature monitoring in servers, base-station and networking switch thermal supervision, and industrial systems requiring both ambient (local) and hotspot (remote) sensing.
For design, keep the D+/D- traces twisted and away from switching nodes; series-resistance correction tolerates up to a few ohms of trace resistance, but excessive capacitance on D+ slows or stops valid conversions.
This page synthesizes distributor pricing, pin-compatible alternatives including the ADT7461 and ADM1032, and practical design notes not found in the manufacturer datasheet.
חלופות תחליף ישיר עבור TMP411EDGKR — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם TMP411EDGKR (אותו גורם צורה וטביעת רגל) — שונים ב Interface, Package, Resolution, Operating Temperature Range, Alert Output.
TMP411ADGKR
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←TMP411BDGKR
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←TMP411CQDGKRQ1
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←TMP411AQDGKRQ1
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ADT7461ARQZ
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
ADM1032
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
TMP411EDGKR דירוגים מרביים ומאפיינים חשמליים
| סוג חיישן | Remote and Local Digital Temperature Sensor |
| Number of Channels | 2 (1 local + 1 remote diode) |
| Remote Channel Accuracy | ±1°C |
| Local Channel Accuracy | ±1°C |
| טווח טמפרטורת פעולה | -55°C to +150°C |
| רזולוציה | 12 bit |
| Supply Voltage Range | 2.7 V to 5.5 V |
| ממשק | SMBus / I2C two-wire serial |
| N-Factor Correction | Yes (register programmable) |
| Series Resistance Correction | Yes |
| מארז | VSSOP-8 (DGK) |
| סוג הרכבה | Surface Mount |
| Pin/Register Compatibility | ADT7461, ADM1032 |
| סטטוס RoHS | Compliant |
| Manufacturer | Texas Instruments |
תצורת פינים של TMP411EDGKR
| פין 1 | D+ — Positive input from remote diode-connected transistor |
| פין 2 | D- — Negative return from remote diode-connected transistor |
| פין 3 | ALERT — SMBus alert / interrupt output (open-drain) |
| פין 4 | GND — Ground |
| פין 5 | SDA — Serial data line (SMBus/I2C) |
| פין 6 | SCL — Serial clock line (SMBus/I2C) |
| פין 7 | THERM — Thermal limit / fan control output |
| פין 8 | V+ — Power supply, 2.7 V to 5.5 V |
יישומים טיפוסיים
TMP411EDGKR מתאים עבור 6 יישוםs: Server CPU Thermal Monitoring, FPGA Junction Temperature Supervision, Networking Switch and Base Station Thermal Management, Industrial Automation Overtemperature Protection, Battery Packs and Portable Device Thermal Safety, Test and Measurement Instrumentation.
Server CPU Thermal Monitoring
The TMP411EDGKR directly reads the on-die thermal diode of server processors, using its ±1°C remote accuracy and N-factor correction register to match the specific CPU process node. Placed within a few centimeters of the CPU socket with the D+/D- traces routed as a paired differential path, it streams 12-bit junction temperatures over SMBus to the BMC for fan control and throttling decisions. Series-resistance correction cancels the few ohms of trace resistance typical in server layouts, preserving accuracy without extra calibration. Compared with a local-only sensor, this remote architecture measures the actual silicon hotspot rather than PCB ambient, providing tens of degrees of relevant margin improvement for thermal protection setpoints.
מומלץ
FPGA Junction Temperature Supervision
Modern FPGAs expose diode-connected transistors for external thermal monitoring, and the TMP411EDGKR is explicitly designed for this use case per TI's product description. Its N-factor correction accommodates the ideality factor of different FPGA process technologies, while ±1°C remote accuracy ensures trip-point settings are neither wastefully conservative nor dangerously tight. The 12-bit output resolves 0.0625°C steps, letting firmware implement smooth closed-loop fan control as logic utilization changes. Placed on the 2.7V-5.5V I/O rail with 0.1uF decoupling, it reports over SMBus alongside voltage monitors; the ALERT pin provides hardware-level interrupt generation when programmed high/low temperature limits are exceeded, enabling autonomous protection without host polling.
מומלץ
Networking Switch and Base Station Thermal Management
Line cards and baseband units pack processors, SERDES, and optics into restricted airflow, making hotspot measurement critical. The TMP411EDGKR monitors the switching-silicon thermal diode while its local channel tracks ambient board temperature near hot air exhaust, both from one 8-pin VSSOP device. Its pin- and register-compatibility with the ADT7461 and ADM1032, documented by TI, gives networking OEMs qualified second sources for long-lifetime telecom builds - an important supply-chain safeguard. The -55°C to +150°C measurement range covers outdoor base-station cold-start through full-load operation, and the SMBus interface integrates directly with standard system-management bus architectures used in ATCA and similar platform specifications.
מומלץ
Industrial Automation Overtemperature Protection
Motor drives, PLC I/O modules, and power supplies in factory environments need both ambient and hotspot sensing to prevent thermal runaway. The TMP411EDGKR's wide -55°C to +150°C range and 2.7V-5.5V supply tolerate industrial rail variations, while the remote channel can monitor a diode-connected transistor mounted on a hot power component such as a MOSFET or IGBT module. Programmed limit registers and the THERM/ALERT outputs allow fail-safe hardware shutdown independent of the main controller. Series-resistance correction keeps accuracy intact across the longer trace runs typical of industrial boards. The automotive-qualified TMP411CQDGKRQ1 variant extends the same circuit into transport and heavy-equipment designs requiring AEC-Q100 devices.
מומלץ
Battery Packs and Portable Device Thermal Safety
Lithium-ion packs and compact portable electronics require tight thermal supervision to prevent operation outside safe charge windows. The TMP411EDGKR's low pin count (8-pin VSSOP, roughly 3x3 mm) fits inside dense battery assemblies, where the remote diode can be a small 2N3904-style transistor positioned at the cell hotspot while the local channel tracks the protection PCB temperature. The 2.7V minimum supply suits 3.3V management rails, and SMBus output feeds the fuel gauge or pack microcontroller directly. ±1°C accuracy keeps charge cutoff thresholds precise; a 5°C error would either waste usable capacity or risk cell stress, so the sensor's specified accuracy is a direct safety and performance contributor.
מומלץ
Test and Measurement Instrumentation
Bench instruments, oscilloscope front ends, and precision measurement modules use the TMP411EDGKR to log internal enclosure temperature and monitor hotspots on processors or analog front-end ICs that expose thermal diodes. The 12-bit resolution (about 0.0625°C) supports drift characterization and temperature-compensation routines in firmware, while the SMBus interface daisy-chains with other management devices on a single two-wire bus. The N-factor register lets one design template accommodate different processor vendors across a product line. Because the part is register-compatible with the ADT7461 and ADM1032, instrument manufacturers can second-source without firmware changes, and the ALERT output supports autonomous datalogger trigger events when limits are crossed.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור TMP411EDGKR — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | TMP411ADGKR | TMP411CQDGKRQ1 | ADT7461ARQZ | ADM1032 |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices | Analog Devices |
| Package | VSSOP-8 (DGK) | VSSOP-8 (DGK) - same | VSSOP-8 (DGK) - same | VSSOP-8 - same footprint | MSOP-8 / SOIC-8 - check footprint |
| N-Factor Correction | Yes | Yes | Yes | Yes | No (fixed N-factor) |
מבדילים עיקריים
- Series-resistance correction cancels PCB trace error (לעומתADM1032)
- Proven pin/register compatibility with two cross-brand parts (לעומתADT7461ARQZ)
- Automotive-grade pin-compatible variant exists (לעומתADT7461ARQZ)
הערות תכנון
Route the D+ and D- traces as a twisted or tightly-coupled differential pair, ideally 2 mm apart or less, and away from switching-regulator nodes and clock lines. The TMP411's series-resistance correction cancels a few ohms of trace resistance, but each 100 pF of additional capacitance on D+ adds roughly 1°C of remote reading error and excessive capacitance (over about 1000 pF) can stall the conversion entirely. Place the sensor close to the processor whose thermal diode it monitors; long runs amplify noise pickup in this low-level delta-VBE measurement.
Supply the TMP411EDGKR from a quiet 2.7V-5.5V rail with a 0.1uF ceramic decoupling capacitor placed within 2 mm of the V+ pin. The remote measurement relies on precise current sources through the external diode, so supply ripple couples directly into reading noise. If only a switching rail is available, add an RC filter (e.g., 10 ohm + 1uF) or use an LDO. Estimated: at typical operating current of well under 1 mA, an RC filter drops negligible voltage while substantially reducing conducted switching noise.
The A/B/C grade variants of the TMP411 differ in N-factor defaults and address behavior - verify the exact variant against the firmware register expectations before substituting between the family members. When second-sourcing with the ADT7461 or ADM1032, confirm the ALERT/THERM pin behavior and limit-register formats in each vendor's datasheet, since register compatibility documented by TI covers the standard register map but edge-case bit definitions may differ. Finally, remember the ALERT output is open-drain and requires an external pull-up resistor to the bus supply.
מידע על תאימות
RoHS compliance per TI product listing. AEC-Q100 is not_applicable to this grade; use TMP411CQDGKRQ1/TMP411AQDGKRQ1 for qualified automotive devices. REACH, halogen-free, and conflict-minerals status not stated in provided data.
