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Texas Instruments TMP432ADGST
- Part No.:
- TMP432ADGST
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TMP432ADGST.pdf
- Description:
- SENSOR DIGITAL -40C-125C 10VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,031
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Product details
Overview
TMP432ADGST from Texas Instruments is a dual-channel remote + local digital temperature sensor IC in VSSOP-10 package, delivering ±1°C remote diode accuracy and ±1°C local die accuracy across –40°C to 125°C ambient, with SMBus™ interface, automatic beta compensation, and series resistance cancellation - used for precision thermal monitoring of CPUs, FPGAs, and power stages in servers and industrial controllers.
For engineers reviewing the TMP432ADGST datasheet, TMP432ADGST pinout, TMP432ADGST application, or TMP432ADGST equivalent, key selection criteria include its two remote diode channels (DXP1/DXN1 and DXP2/DXN2), programmable THERM/ALERT outputs, 0.0625°C resolution, 2.7–5.5 V supply range, and support for extended temperature measurement up to 191°C via configuration register.
Technical Context
The TMP432ADGST integrates a local thermal sensor and two independent remote diode sensing channels using collector-current-driven biasing to enable automatic beta compensation across transistor beta values from 0.1 to 27. It implements series resistance cancellation (up to 1 kΩ when beta correction disabled, 300 Ω when enabled) and supports η-factor correction (1.000 or 1.008) for improved accuracy with PNP or NPN diode-connected transistors.
Its SMBus 2.0–compliant interface supports write byte, read byte, send byte, and receive byte commands at up to 3.4 MHz clock rate, with built-in timeout (25–35 ms), open-drain SCL/SDA, and dual configurable alert outputs (ALERT/THERM2 and THERM) that require external pullups. Conversion timing varies by channel and beta mode: remote channel conversion takes 33–137 ms depending on RC setting and beta state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Local Accuracy | ±1°C over 0°C–100°C ambient; enables reliable die-temperature tracking without calibration |
| Remote Accuracy | ±1°C over 0°C–100°C ambient and –40°C–150°C diode temp; supports multi-die thermal validation |
| Resolution | 0.0625°C (12-bit); provides fine-grained thermal trend analysis for fan control and throttling |
| Supply Range | 2.7 V to 5.5 V; compatible with 3.3 V and 5 V system rails without level-shifting |
| Quiescent Current | 35–45 μA at 0.0625 conversions/s; enables low-power thermal monitoring in always-on subsystems |
| Remote Channels | Two independent channels (DXP1/DXN1 and DXP2/DXN2); allows simultaneous monitoring of CPU + GPU or FPGA + VRM |
| SMBus Speed | Up to 3.4 MHz high-speed mode; reduces bus occupancy during frequent thermal polling |
Pinout & Package
VSSOP-10 package (3.00 mm × 3.00 mm, 0.5 mm pitch), thermally enhanced with exposed pad (DGS suffix), suitable for compact PCB layouts and high-density thermal sensor placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Power supply input | Accepts 2.7–5.5 V; powers internal regulator, ADC, and SMBus I/O; requires 0.1 µF bypass capacitor |
| GND | Ground reference | Common return for analog and digital circuits; connects to PCB ground plane for noise immunity |
| SCL | SMBus clock input | Open-drain, requires external pullup to V+; defines serial bus timing; supports 3.4 MHz max frequency |
| SDA | SMBus bidirectional data | Open-drain, requires external pullup to V+; carries configuration writes and temperature reads |
| DXP1 / DXN1 | Channel 1 remote diode inputs | Differential analog inputs for first external transistor/diode; enable series resistance cancellation |
| DXP2 / DXN2 | Channel 2 remote diode inputs | Differential analog inputs for second external transistor/diode; independent of Channel 1 |
| THERM | Dedicated thermal flag output | Open-drain, active-low; asserts when local or remote temp exceeds programmable THERM limit |
| ALERT/THERM2 | Configurable dual-function output | Open-drain, active-low; can be set as secondary thermal alert or SMBus ALERT response signal |
Key Features
| Feature | Design Value |
|---|---|
| Automatic beta compensation | Adapts to beta factor from 0.1 to 27 per conversion; eliminates calibration drift across process nodes and temperature |
| Series resistance cancellation | Compensates up to 1 kΩ trace resistance (beta disabled) or 300 Ω (beta enabled); removes PCB layout-induced offset |
| Programmable η-factor | Supports 1.000 or 1.008 ideality factor; matches physical characteristics of common PNP/NPN sensing transistors |
| Dual remote + local sensing | Three independent temperature measurements (1 local + 2 remote) in single VSSOP-10 IC; reduces BOM count vs discrete sensors |
| Extended temperature range | Configurable –64°C to 191°C measurement range (via Configuration Register 1 bit 2); covers extreme industrial and automotive use cases |
Applications
| Processor Thermal Monitoring | FPGA and ASIC Thermal Management |
|---|---|
Use Scenario: Real-time junction temperature tracking of multi-core x86 processors in rack-mounted servers under dynamic load. IC Role / Device Role / Timing Role: TMP432ADGST acts as the primary remote temperature monitor, interfacing with on-die PNP transistors via DXP1/DXN1 and DXP2/DXN2 to report die hotspots to BMC over SMBus. Use Value: Enables precise thermal throttling and fan speed control using ±1°C remote accuracy - critical for maintaining performance within ASHRAE A3/A4 environmental envelopes. | Use Scenario: Monitoring thermal gradients across large FPGA packages (e.g., Xilinx Virtex UltraScale+) during high-throughput compute workloads. IC Role / Device Role / Timing Role: TMP432ADGST serves as dual-channel remote sensor, connecting to two separate on-package diodes to detect localized heating near I/O banks and core logic regions. Use Value: Provides independent temperature data streams with 0.0625°C resolution, allowing adaptive voltage/frequency scaling based on spatial thermal profiles. |
| Industrial PLC Controller Thermal Safety | Telecom Baseband Unit Temperature Supervision |
Use Scenario: Overtemperature protection for convection-cooled programmable logic controllers operating in unconditioned factory environments (–40°C to +70°C ambient). IC Role / Device Role / Timing Role: TMP432ADGST monitors both local die temperature and remote heatsink-mounted transistor, asserting THERM output to disable power stage if either exceeds 85°C. Use Value: Dual alert outputs (THERM + ALERT/THERM2) allow independent safety and warning thresholds - meeting IEC 61508 functional safety requirements without external logic. | Use Scenario: Thermal supervision of high-density baseband processing units in 5G macrocell radios, where ambient temperatures reach 75°C and airflow is constrained. IC Role / Device Role / Timing Role: TMP432ADGST interfaces with two remote diodes placed near RF power amplifiers and DSP ASICs, reporting temperature min/max values via SMBus to host controller every 500 ms. Use Value: Programmable minimum/maximum temperature registers and diode fault detection prevent false alarms caused by open-circuit sensor failures - improving system uptime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar remote/local temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TMP451RTER | Single remote + local channel, 12-bit resolution, same SMBus interface, but no dual remote capability; smaller 3-mm × 3-mm WSON-8 package | Limited to one remote diode; unsuitable for multi-die monitoring; lower pin count simplifies routing in space-constrained designs | Select when only one remote sensor is required and board area is premium; not drop-in for TMP432ADGST's dual-channel use case |
| LM95235CIMMX | Two remote + one local channel, SPI-only interface, ±1.5°C remote accuracy (worse than TMP432ADGST's ±1°C), 2.8–3.8 V supply only | Requires SPI host instead of SMBus; lacks ALERT/THERM2 reconfiguration; narrower supply range limits compatibility with 5 V systems | Choose for SPI-based microcontrollers where SMBus is unavailable; verify accuracy tolerance fits thermal control loop budget |
Compared with TMP432ADGST, TMP451RTER offers footprint reduction but sacrifices dual remote sensing, while LM95235CIMMX provides similar channel count but trades SMBus compatibility and ±1°C accuracy for SPI interface and relaxed supply constraints - making TMP432ADGST optimal for SMBus-centric, high-accuracy, multi-die thermal architectures.
Availability
TMP432ADGST is available at Aetrix Electronics and suitable for server thermal management, industrial PLC safety systems, and 5G baseband unit temperature supervision requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for TMP432ADGST 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 decades of leadership in precision analog sensing and industrial-grade IC design.
The TMP43x product line was designed specifically for high-accuracy, multi-point thermal monitoring in computing, telecom, and industrial equipment - emphasizing SMBus integration, automatic compensation for real-world sensor nonidealities, and robust operation across extended temperature ranges.
FAQ
What is the maximum remote temperature measurement range supported by the TMP432ADGST?
The TMP432ADGST supports an extended remote temperature measurement range of –64°C to 191°C when bit 2 of Configuration Register 1 is set high. However, practical accuracy remains ±1°C only within –40°C to 150°C for the remote diode sensor, as validated across multiple transistor manufacturers. The local sensor is specified from –40°C to 125°C ambient. This extended range is enabled via firmware configuration and does not require hardware changes to the TMP432ADGST circuit.
Does the TMP432ADGST require external calibration for remote diode measurements?
No, the TMP432ADGST does not require external calibration for remote diode measurements. Its automatic beta compensation, series resistance cancellation, and η-factor correction are implemented in hardware and applied per conversion. Texas Instruments specifies ±1°C remote accuracy across –40°C to 150°C diode temperature without user calibration - verified across NPN and PNP transistors from major semiconductor suppliers. Calibration is unnecessary unless custom diode models with atypical ideality factors are used.
How many remote temperature sensing channels does the TMP432ADGST support?
The TMP432ADGST supports two independent remote temperature sensing channels: Channel 1 uses pins DXP1 and DXN1, and Channel 2 uses pins DXP2 and DXN2. Each channel accepts a diode-connected transistor or dedicated thermal diode and performs full compensation (beta, series resistance, η-factor) separately. This dual-channel capability distinguishes the TMP432ADGST from the single-channel TMP431 and enables simultaneous monitoring of two distinct thermal zones - such as CPU and GPU - using one TMP432ADGST device.
What SMBus interface features does the TMP432ADGST implement?
The TMP432ADGST implements full SMBus 2.0 compliance, supporting write byte, read byte, send byte, and receive byte commands at clock rates up to 3.4 MHz. It includes built-in 25–35 ms timeout detection, open-drain SCL/SDA with internal level-shifted drivers, and programmable slave address (three options via ADDR pin). The TMP432ADGST also supports SMBus Alert Response Address (ARA) protocol via the ALERT/THERM2 pin when configured in ALERT mode - enabling efficient interrupt-driven thermal event handling without continuous polling.
Can the ALERT and THERM outputs of the TMP432ADGST drive standard logic-level inputs directly?
No, the ALERT and THERM outputs of the TMP432ADGST are open-drain and cannot drive standard logic-level inputs directly without external pullup resistors. Both outputs require connection to V+ (2.7–5.5 V) via a pullup resistor - typically 4.7 kΩ - to establish a valid high state. When asserted, they sink up to 6 mA at 0.4 V, compatible with 3.3 V or 5 V logic families. Wired-OR sharing with other SMBus devices is supported, but direct connection to CMOS/TTL inputs without pullups will result in undefined or floating states.
TMP432ADGST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Sensor Type:
- Digital, Local/Remote
- Sensing Temperature - Local:
- -40°C ~ 125°C
- Sensing Temperature - Remote:
- -64°C ~ 191°C
- Output Type:
- SMBus
- Voltage - Supply:
- 2.7V ~ 5.5V
- Resolution:
- 12 b
- Features:
- One-Shot, Output Switch, Programmable Limit, Programmable Resolution, Shutdown Mode
- Accuracy - Highest (Lowest):
- ±1°C (±2.5°C)
- Test Condition:
- 0°C ~ 100°C (-40°C ~ 125°C)
- Operating Temperature:
- -55°C ~ 127°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 10-VSSOP
TMP432ADGST FAQ
1.How can I place an order for TMP432ADGST through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP432ADGST 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 TMP432ADGST reliable?
The price and inventory of TMP432ADGST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP432ADGST is usually 5 days.
3.What payment methods are accepted for TMP432ADGST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP432ADGST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP432ADGST?
TMP432ADGST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP432ADGST 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 TMP432ADGST?
For technical support, including TMP432ADGST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP432ADGST requirements.
6.How does Aetrix verify that TMP432ADGST is sourced from the original manufacturer or authorized distributors?
All TMP432ADGST 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 TMP432ADGST meets industry standards.
7.What is the process for return or replacement of TMP432ADGST?
All TMP432ADGST units undergo pre-shipment inspection (PSI). If there is an issue with TMP432ADGST, 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 TMP432ADGST part is unused and in its original packaging.
Return procedure for TMP432ADGST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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