The TMP117 is a digital temperature sensor with ±0.1 °C maximum error from −20 to 50 °C, 16-bit resolution and an I2C interface, so a robot can read battery, motor or ambient temperature with no analog front end. It runs from 1.7 to 5.5 V and uses a typical 3.5 µA at one conversion per second. Figures are from the Texas Instruments TMP117 datasheet SNOSD82D.
Key specifications
| Accuracy | ±0.1 °C (−20 to 50 °C) |
|---|---|
| Resolution | 16-bit, 0.0078 °C |
| Supply | 1.7–5.5 V |
| Interface | I2C / SMBus |
| Addresses | 4 (ADD0 pin) |
| Range | −55 to 150 °C |
What the datasheet promises
| Item | Datasheet value |
|---|---|
| Accuracy | ±0.1 °C max from −20 to 50 °C; ±0.15 °C from −40 to 70 °C; ±0.3 °C from −55 to 150 °C |
| Resolution | 16-bit, 0.0078 °C per LSB |
| Operating temperature | −55 to 150 °C |
| Supply voltage | 1.7 to 5.5 V (−55 to 70 °C); 1.8 to 5.5 V up to 150 °C |
| Supply current | 3.5 µA typical at a 1 Hz conversion cycle; 150 nA typical shutdown |
| Interface | SMBus- and I2C-compatible, programmable alert limits |
| Addresses | Four, set by the ADD0 pin: ground, V+, SDA or SCL |
| Conversion | 15.5 ms active conversion; selectable averaging |
| Memory | 48 bits of general-purpose EEPROM |
| Packages | WSON 6 (2.00 × 2.00 mm) and DSBGA 6 |
The datasheet notes that the low power use keeps self-heating from affecting the reading. The accuracy applies to the chip; the reading on a robot also depends on where the sensor sits and how well it is coupled to the thing you are measuring.
Using it on a robot
- Mount it against the battery pack or motor housing, not in the air stream of a fan, if you want that part’s temperature.
- Wire SDA and SCL with pull-up resistors, and choose the ADD0 connection to avoid a clash with another sensor on the same bus.
- Use the alert pin to warn the controller when a limit is passed, instead of polling.
- The chip itself is a small WSON or DSBGA part, so most people buy it on a breakout board.
Sources and further reading
- Texas Instruments TMP117 datasheet (SNOSD82D) — accuracy, supply, current, addresses and conversion time above.
Last reviewed: November 2026. Limits are from the Texas Instruments datasheet; breakout boards vary. No price is quoted because it has not been checked.
Where to buy in India
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