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Texas Instruments TMP512AIRSAR
- Part No.:
- TMP512AIRSAR
- Manufacturer:
- Texas Instruments
- Category:
- Thermal Management
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
TMP512AIRSAR.pdf
- Description:
- IC TEMP SNSR DUAL REMOTE 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,124
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Product details
Overview
TMP512AIRSAR from Texas Instruments is a dual-channel temperature and high-side current/power monitor IC integrating local die sensing, two remote diode junction sensors, and a 12-bit ADC-based shunt voltage monitor. It delivers ±1°C remote and ±1°C local temperature accuracy, measures bus voltages from 0V to +26V, reports current in amps and power in watts, and operates from –40°C to +125°C with 1.4mA max supply current. It is used in server power rail monitoring and thermal management of multi-core processors.
For engineers reviewing the TMP512AIRSAR datasheet, TMP512AIRSAR pinout, TMP512AIRSAR application, or TMP512AIRSAR equivalent, key selection criteria include dual remote channel support, series resistance cancellation up to 3kΩ, SMBus-compatible two-wire interface, programmable n-factor correction, and integrated watchdog limits for over/under-temperature and over-current events.
Technical Context
The TMP512AIRSAR implements a dedicated 12-bit successive-approximation ADC with configurable PGA (÷1/÷2/÷4/÷8) for shunt voltage measurement and independent 13-bit temperature conversion engines for local and remote channels. Its remote sensing architecture uses sequential current excitation and differential VBE measurement with built-in series resistance cancellation and n-factor correction.
It features three subregulator configurations: Configuration 1 (V+ = 4.5–26V, bus range 4.5–26V), Configuration 2 (V+ = 4.5–26V, bus range 0–26V), and Configuration 3 (V+ = 3–5.5V, bus range 0–26V). The device supports SMBus Alert response and includes separate upper/lower watchdog comparators for temperature and current registers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Remote Temp Accuracy | ±1°C over –40°C to +125°C ambient; enables precise thermal throttling without calibration. |
| Local Temp Accuracy | ±1°C over –40°C to +125°C; provides accurate on-die junction monitoring for CPU/GPU thermal protection. |
| Shunt Voltage Range | ±40mV full-scale (PGA ÷1); supports 10μV LSB resolution for high-precision current sensing at low RSHUNT. |
| Bus Voltage Range | 0V to +26V (Configurations 2 & 3); allows direct monitoring of 12V, 5V, 3.3V, and auxiliary rails without external dividers. |
| ADC Resolution | 12-bit for current/voltage, 13-bit for temperature; ensures 0.0625°C temperature step size and <1% full-scale error over temp. |
| Supply Range | +3V to +26V; powers directly from system bus, eliminating need for auxiliary LDOs in industrial/server designs. |
| Interface | SMBus 2.0 / two-wire compatible; supports 3.4MHz clock, 28ms timeout, and open-drain SDA/SCL with 6mA sink capability. |
Pinout & Package
Package: QFN-16 (RSA), 4mm × 4mm, 0.5mm pitch, exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Filter C) | Subregulator output filter node | Requires 100nF (Config 3) or 470nF (Configs 1/2) ceramic capacitor to stabilize internal 3.3V regulator and reduce noise coupling. |
| 2 (V+) | Main supply input | Accepts +3V to +26V; powers all circuitry including ADC, digital core, and subregulator - no external bias needed. |
| 3 (VIN+) | High-side shunt positive sense | Connects to shunt resistor's load-side terminal; differential input with VIN− forms current-sense pair. |
| 4 (VIN−) | High-side shunt negative sense | Connects to shunt resistor's source-side terminal; common-mode range extends to +26V for direct bus sensing. |
| 5 (SDA) | Two-wire data line | Open-drain SMBus data I/O; requires external pull-up to 3.3V; supports multi-master arbitration and alert response. |
| 6 (SCL) | Two-wire clock line | Open-drain SMBus clock input; synchronizes register reads/writes and triggers conversions on falling edge. |
| 7 (A0) | I²C address select | Defines LSB of 7-bit slave address (101110x); enables up to four TMP512AIRSAR devices on same bus. |
| 8 (DXP1) | Channel 1 remote sensor + | Drives excitation current into PNP/NPN transistor base or diode anode; paired with DXN1 for differential sensing. |
| 9 (DXN1) | Channel 1 remote sensor − | Completes remote channel 1 current path; enables series resistance cancellation and n-factor correction. |
| 10 (DXP2) | Channel 2 remote sensor + | Second independent remote sensing channel; identical functionality to DXP1/DXN1 for dual-processor or VRM monitoring. |
| 11 (DXN2) | Channel 2 remote sensor − | Completes remote channel 2 path; supports simultaneous dual-junction measurements with auto-cancellation. |
| 12 (GPIO) | General-purpose I/O | Totem-pole output or digital input; default input state; usable for status signaling or hardware reset coordination. |
| 13 (ALERT) | SMBus alert output | Open-drain interrupt signal asserted when any watchdog limit (temp/current/power) is exceeded; maskable per register. |
| 14 (GND) | Analog/digital ground | Single ground reference for all analog and digital sections; must be connected to low-impedance system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Dual remote diode sensing | Supports two independent external transistors/diodes (e.g., CPU/GPU die sensors) with automatic series resistance cancellation up to 3kΩ. |
| Programmable n-factor correction | Adjustable ideality factor (default 1.008) stored in dedicated registers (16h/17h) to match specific remote sensor characteristics. |
| Integrated high-side current monitor | Measures shunt voltage with 12-bit ADC, PGA scaling, and direct current readout in amps - no external op-amp or multiplier required. |
| Three subregulator configurations | Enables flexible system-level integration: Config 1 (4.5–26V bus), Config 2 (0–26V bus), Config 3 (3–5.5V V+, 0–26V bus) - selectable via external connections. |
| Independent watchdog comparators | Dual-limit (upper/lower) thresholds for local temp, remote temp (per channel), current, and power - each with dedicated mask bits and ALERT assertion. |
Applications
| Server Power Rail Monitoring | Multi-Core Processor Thermal Management |
|---|---|
Use Scenario: Real-time monitoring of 12V/5V/3.3V input rails and VRM output currents in rack-mounted servers. IC Role / Device Role / Timing Role: High-side current shunt monitor and bus voltage sensor; performs concurrent 12-bit current + 13-bit temperature conversions every 100–130ms. Use Value: Enables dynamic power capping and predictive thermal shutdown using calibrated current-to-power calculation and dual remote sensor inputs. | Use Scenario: Simultaneous die temperature tracking of CPU and GPU in high-performance computing blades. IC Role / Device Role / Timing Role: Dual remote diode sensor with series resistance cancellation; interfaces via SMBus to BMC for thermal policy enforcement. Use Value: Delivers ±1°C accuracy across –40°C to +125°C without per-board calibration, reducing test time and field failure rates. |
| Industrial PLC Power Integrity | Telecom Line Card Thermal Protection |
Use Scenario: Monitoring power delivery integrity and ambient temperature in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Local temperature sensor + dual remote channels for field I/O module heatsinks; alerts on over-temperature or over-current faults. Use Value: Provides fault logging and graceful degradation via ALERT pin and SMBus status registers, meeting IEC 61000-4 immunity requirements. | Use Scenario: Thermal supervision of high-density optical transceiver modules in central office telecom equipment. IC Role / Device Role / Timing Role: Remote sensor interface to laser diode driver ICs and TEC controllers; integrates with existing two-wire management bus. Use Value: Supports n-factor tuning for diverse semiconductor junctions (InGaAs, GaAs) and rejects PCB trace resistance errors up to 3kΩ. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar temperature and current monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TMP513AIRSAT | Triple remote channel (vs dual), same QFN-16 package and pinout; adds DXP3/DXN3 pins; identical electrical specs and SMBus interface. | Required where three independent thermal zones (e.g., CPU + GPU + VRM) must be monitored concurrently. | Select TMP513AIRSAT only if third remote channel is needed; otherwise TMP512AIRSAR reduces BOM cost and layout complexity. |
| INA226AIDR | Current/power monitor only (no temperature sensing); 16-bit delta-sigma ADC; 0.1% current accuracy; supports bidirectional current; no remote diode interface. | Used when high-accuracy current/power telemetry is primary requirement and thermal monitoring is handled separately. | Choose INA226AIDR for precision power analysis; TMP512AIRSAR remains optimal when combined thermal + power visibility is mandatory. |
Compared with TMP512AIRSAR, TMP513AIRSAT adds a third remote channel without changing supply, interface, or accuracy specs - ideal for expanded thermal coverage - while INA226AIDR trades temperature capability for higher current resolution and bidirectional sensing, requiring separate thermal ICs for full system monitoring.
Availability
TMP512AIRSAR is available at Aetrix Electronics and suitable for server power integrity, multi-core processor thermal management, and industrial PLC power monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TMP512AIRSAR 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 broad industrial and enterprise design expertise.
The TMP512AIRSAR belongs to TI's precision system monitoring product line, designed specifically for real-time thermal and power telemetry in high-reliability computing, telecom, and industrial infrastructure systems.
FAQ
What is the maximum remote sensor series resistance supported by the TMP512AIRSAR?
The TMP512AIRSAR supports up to 3kΩ of total series resistance in remote diode sensor traces through its built-in cancellation algorithm. This eliminates the need for board-level characterization or software compensation, maintaining ±1°C accuracy across the full –40°C to +125°C operating range. The feature applies to both DXP1/DXN1 and DXP2/DXN2 channels independently and is enabled automatically on power-up.
How does the TMP512AIRSAR handle different remote sensor ideality factors (n-factor)?
The TMP512AIRSAR includes dedicated n-factor correction registers (addresses 16h and 17h) for each remote channel, allowing users to program values between 1.000 and 1.016 in 0.001 increments. The default power-on value is 1.008. This adjustment compensates for non-ideal behavior of discrete diodes or transistor junctions, ensuring accurate temperature conversion using the VBE differential equation. The TMP512AIRSAR applies the programmed n-factor during all remote temperature calculations.
Can the TMP512AIRSAR measure bus voltage down to 0V?
Yes, the TMP512AIRSAR can measure bus voltage from 0V to +26V - but only in Subregulator Configuration 2 or Configuration 3. In Configuration 1 (V+ tied to subregulator), the minimum measurable bus voltage is 4.5V. Configuration 2 isolates the subregulator supply from VIN−, enabling true 0V common-mode operation. Configuration 3 uses the Filter C pin as the internal supply rail, also supporting 0V bus sensing. Selection depends on system V+ range and layout constraints.
What is the conversion time for temperature measurements on the TMP512AIRSAR?
The TMP512AIRSAR performs temperature conversions in 100ms to 130ms per channel, depending on configuration and averaging settings. Local and each remote channel convert sequentially; full acquisition of local + two remote temperatures takes approximately 300–390ms. Conversion timing is deterministic and unaffected by SMBus traffic, as the ADC operates autonomously once triggered. The device supports one-shot and continuous conversion modes via control registers.
Does the TMP512AIRSAR require external components for basic operation?
Yes, the TMP512AIRSAR requires external components for reliable operation: a 100nF ceramic capacitor on Filter C (Configuration 3) or 470nF (Configurations 1/2), pull-up resistors on SDA and SCL (typically 4.7kΩ to 3.3V), and a shunt resistor for current sensing. No external op-amps, voltage dividers, or calibration circuitry are needed. The GPIO pin may require a pull-down or pull-up resistor if unused, and ALERT requires a pull-up for proper open-drain operation.
TMP512AIRSAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-VQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Temp Monitoring System (Sensor), Watchdog
- Sensor Type:
- Internal and External
- Sensing Temperature:
- -40°C ~ 125°C
- Accuracy:
- ±2.5°C Local(Max), ±5°C Remote(Max)
- Topology:
- ADC, Multiplexer, Register Bank
- Output Type:
- 2-Wire Serial, I2C/SMBUS
- Output Alarm:
- Yes
- Output Fan:
- No
- Voltage - Supply:
- 3V ~ 26V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (4x4)
TMP512AIRSAR FAQ
1.How can I place an order for TMP512AIRSAR through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP512AIRSAR 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 TMP512AIRSAR reliable?
The price and inventory of TMP512AIRSAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP512AIRSAR is usually 5 days.
3.What payment methods are accepted for TMP512AIRSAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP512AIRSAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP512AIRSAR?
TMP512AIRSAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP512AIRSAR 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 TMP512AIRSAR?
For technical support, including TMP512AIRSAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP512AIRSAR requirements.
6.How does Aetrix verify that TMP512AIRSAR is sourced from the original manufacturer or authorized distributors?
All TMP512AIRSAR 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 TMP512AIRSAR meets industry standards.
7.What is the process for return or replacement of TMP512AIRSAR?
All TMP512AIRSAR units undergo pre-shipment inspection (PSI). If there is an issue with TMP512AIRSAR, 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 TMP512AIRSAR part is unused and in its original packaging.
Return procedure for TMP512AIRSAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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