The TMP421, TMP422, and TMP423 are remote temperature sensor monitors with a built-in local temperature sensor. The remote temperature sensor diode-connected transistors are typically low-cost, NPN- or PNP-type transistors or diodes that are an integral part of microcontrollers, microprocessors, or FPGAs.
Remote accuracy is ±1°C for multiple IC manufacturers, with no calibration needed. The two-wire serial interface accepts SMBus write byte, read byte, send byte, and receive byte commands to configure the device.
The TMP421, TMP422, and TMP423 include series resistance cancellation, programmable non-ideality factor, wide remote temperature measurement range (up to +150°C), and diode fault detection.
The TMP421, TMP422, and TMP423 are all available in a SOT23-8 package. The TMP421C is also available in a DSBGA (WCSP) package.
| Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | ±1°C Remote and Local Temperature Sensor datasheet (Rev. C) | May 7, 2012 | |
| Application note | How to Read and Interpret Digital Temperature Sensor Output Data (Rev. A) | PDF | HTML | Jan 21, 2025 |
For additional terms or required resources, click any title below to view the detail page where available.
The Linux driver supports the TMP421 series of Remote and Local Temp Sensors. The Linux driver supports communication through the I2C bus and interfaces with the Hardware Monitoring sub-system.
Linux Mainline StatusAvailable in Linux Main line: Yes
Available through git.ti.com: N/A
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| DSBGA (YZD) | 8 | Ultra Librarian |
| SOT-23 (DCN) | 8 | Ultra Librarian |
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