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 TMP117 
 Temperature sensors 

High-precision digital temperature sensor offering ±0.1 °C accuracy for industrial and medical applications.

 Maximum precision
+/- 0,1°K

 Measurement range
-55 / 150°C

 Resolution
16 bits

 Power supply voltage
1,8 → 5,5V

Conversion speed

15,5 to 1mS

I2C adress
0 x 48

 Typical current
3,5µA(active)

 Price
Medium

What is a TMP117 sensor ?Operating principleTemperature curve / numerical value (16-bit resolution)Principle diagram (I2C connection)Application areas

What is a TMP117 sensor ?

The TMP117 is a high-precision digital temperature sensor from Texas Instruments.

It is the direct successor to the TMP102, but with quadrupled resolution and metrological accuracy suitable for medical and industrial applications.

It features a factory-calibrated 16-bit ADC, integrated thermal compensation, and a programmable offset, making it perfectly usable without external calibration.

Operating principle

The TMP117 converts the temperature of a calibrated internal diode via a 16-bit ΔΣ converter.

The measurement is stored in an internal register, accessible via the I²C bus.

Each bit represents 0.0078125 °C, with a signed 16-bit format (two's complement).

​T(°C) = Binare code x 0,0078125

This resolution allows for a sensitivity of 7.8 mK, which is finer than the thermal variation of a human finger on a sensor.

Temperature curve / numerical value (16-bit resolution)

Temperature (°C)
 Numerical value (hex)

Binary output (12bits)

-40

 0xF580

1111 0101 1000 0000
0 0x0000

0000 0000 0000 0000

25

0x0800

0000 1000 0000 0000

100 0x2000

0010 0000 0000 0000

150

0x2E00

0010 1110 0000 0000

💡 Resolution: 1 LSB = 0.0078125 °C → 128 steps per degree Celsius.

Principle diagram (I²C connection)

+3.3V
  │
 [TMP117]
  │ SDA ─────────┐
  │ SCL ─────────┤── [I²C Microcontroller]
  │ ALERT ───────┘
  │ GND

💡 A single I²C bus can control up to 4 TMP117s through address selection (0x48 → 0x4B).

Application areas

🩺 Medical devices (thermography, patient monitoring)

🧪 Laboratories, metrology, and calibration

⚙️ Precision industrial control

🔋 Thermal management of batteries and sensitive equipment



Should I choose a TMP117 sensor ?

Strengths points

  • 🎯 Metrological precision
         → Ideal for autonomous objects, it consumes only a few microamperes in standby.
  • 🧠 Extreme resolution (16 bits)→ Each LSB represents less than 8 thousandths of a degree — perfect for detecting micro-thermal variations.
  • 💤 Ultra low power consumption
         → Negligible consumption, ideal for autonomous connected devices.
  • 🔧 Programmable calibration and offset
         → Allows for correcting offsets or adjusting measurements according to the setup.
TMP117 sensors

Weaknesses points

  • 🌡️ More limited range than thermocouples
         → Not suitable beyond +150 °C (internal electronics limited).
  • ⚙️ Strict I²C Communication
         → Not compatible with SPI or 1-Wire — requires an active I²C interface.
  • 💸 Slightly more expensive
         → But the price/performance ratio remains excellent for the category.

Useful information

Here is some useful information regarding the TMP117 sensors.

Adress Registry Name
 Function
0x00 Temperature Result Contains the measured temperature (16 signed bits)
0x01 Configuration Register Sampling modes and alerts
0x02 T_High Limit High alert threshold
0x03 T_Low Limit Low alert threshold
0x04 EEPROM Unlock / Offset Calibrations and internal memories
0x0F Device ID / Revision Sensor Identification (read-only) 
i2c_start();
i2c_write(0x48 << 1);     // Address TMP117 (writing)
i2c_write(0x00);          // Temperature log
i2c_start();
i2c_write((0x48 << 1) | 1); // Lecture
MSB = i2c_read_ack();
LSB = i2c_read_nack();
i2c_stop();

raw = (MSB << 8) | LSB;
if (raw > 0x7FFF) raw -= 65536; // Gestion du signe
temp = raw * 0.0078125; // Conversion en °C

✅ Example: MSB = 0x08, LSB = 0x00 →

Temperature = (0x0800 × 0.0078125) = 25.0 °C

3.3V ───────────────┐
                    │
                   [TMP117]
                    │ SDA ─────┐
                    │ SCL ─────┤── MCU (Arduino, ESP32, STM32)
                    │ ALERT ───┘
                    │ GND

💡 Pull-up resistors of 4.7 kΩ on SDA and SCL ensure stable communication.

Bit Nom Description
[15:12] Mode 0000 : Continu, 0001 : One-shot
[11:9] Conversion rate 000 → 15,5 ms / 111 → 1 s
[8] Alert polarity 0 : Active low / 1 : Active high
[7:5] Averaging Average over 1, 8, 32, 64 samples
[4:0] Shutdown / Reset / EEPROM Low energy management

The TMP117 is factory calibrated with a maximum error of ±0.1 K over the critical range,

and typically ±0.3 K over the rest.

📈 Typical accuracy:

Temperature (°C) Max error (K)
−40 ±0,3
0 ±0,1
50 ±0,1
100 ±0,2
125 ±0,3
💡 A stability of ±0.05 K after 1,000 hours at 85 °C — nearly unmatched for an I²C sensor.

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