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 ADT7310 
 Temperature sensors 

High-accuracy digital temperature sensor with fast conversion time and SPI interface for demanding measurement applications.

 Maximum precision
+/- 0,25°K

 Minimum temperature
-55°C

 Maximum temperature
+150°C

 Minimum dimensions
4 x 4 x 0,9

Response time

Fast

 Drift

Low

 Self-warming
Low

Price
High

What is a ADT7310 sensor ?Operating principleTechnical SpecificationsWiring ConfigurationSelf-warmingApplication areas

What is a ADT7310 sensor ?

The ADT7310 is a high-resolution digital temperature sensor with SPI designed by Analog Devices.

It integrates:

  • an ultra-stable bandgap temperature sensor,
  • a 16-bit ADC converter,
  • and a 4-wire SPI interface compatible up to 10 MHz.

It provides linear, accurate, and repeatable measurements without external calibration.

Operating principle

The sensor measures the voltage proportional to the temperature using an internal PN transistor.

This voltage is converted by a 16-bit ADC, digitally corrected, and then transmitted via SPI.

The output is signed (two's complement); each least significant bit represents 0.0078 °C in 16-bit mode.

T(°C) : Value16b x 0,0078

Technical specifications

Parameter
 Typical value
Resolution 16 bits (0,0078 °C / LSB)

Precision

±0,25 K (0 → +70 °C)

Interface

SPI (read/write)

Power supply voltage

2,7 → 5,5 V

Max. SPI Frequency

10 MHz

Conversion time

220 ms

Consumption

210 µA typical

Sleep mode

< 1 µA

Internal records

Configuration, thresholds, sensor ID

Case

MSOP-8 / LFCSP 8 pins

Annual drift

±0,05 K/year

Wiring Configuration

Brooch Name

Function

1

 CS

Chip Select (active low)
2 SCLK

SPI Clock
3 DIN

SPI Input (MOSI)

4

DOUT

SPI Output (MISO)

5

INT

Output interruption (optional)

6

CT

Comparator output (optional)

7

GND

Mass

8

VDD

Power supply 2.7–5.5 V

Self-warming

The self-heating is less than 0.05 °C, even under continuous operation,

thanks to a very low current (210 µA) and an optimized sigma-delta ADC.

Application areas

⚙️ Laboratory instrumentation (calibration benches, metrology)

🧠 Medical applications (incubators, skin sensors, monitoring)

💡 High-precision industrial control

🧱 Drift-sensitive embedded systems

🔬 Reference digital thermometers






Should I choose a ADT7310 sensor ?

Strengths points

  • 🎯 Exceptional metrological precision
         → With an accuracy of ±0.25 K and a resolution adjustable up to 16 bits (0.0078 °C), the ADT7310 outperforms most SPI sensors on the market. Ideal for applications requiring reference accuracy.
  • 🧠 Factory calibration and long-term stability
         → Each sensor is individually calibrated at Analog Devices, ensuring a stability of ±0.05 K/year without external recalibration.
  • 💡 Flexible SPI mode and integrated alarm
         → Fast SPI interface (10 MHz) compatible with 3 or 4 wires, and configurable INT / CT outputs to trigger real-time thermal alert thresholds.

Weaknesses points

  • 💰 Above average cost
         → Its precision and stability come at a price: it is a high-end component, reserved for critical or calibration applications.
  • 🔋 Longer conversion time
         → The 16-bit mode (240 ms) can slow down systems requiring ultra-fast measurement.
  • 📶 Sensitivity to electromagnetic environment
    → Like any precision sensor, it requires special care in routing and filtering to maintain its optimal performance.

Useful information

Here is some useful information regarding the ADT7310 sensors.

The ADT7310 offers a configurable resolution of 13 to 16 bits.

In 16-bit mode, each LSB represents 0.0078 °C, making it one of the finest resolutions in its class.

It combines a calibrated silicon junction measurement, a 16-bit sigma-delta converter, and internal compensation ensuring exceptional accuracy.

Parameter Typical value
Resolution 13, 14, 15 or 16 bits (configurable)
LSB (16 bits) 0,0078 °C
Precision
 ±0,25 K (−10 → +85 °C) / ±0,5 K (−40 → +125 °C)
Measurement range
 −55 → +150 °C
Annual drift
 ±0,05 K
Conversion time
 240 ms
Power supply voltage
 2,7 → 5,5 V
Typical current
 210 µA
Max. SPI Frequency
 10 MHz

🔹 Remarks:

  • The sensor is fully calibrated at the factory (no external correction required).
  • The conversion is signed (two's complement), facilitating the reading of negative temperatures.
  • Compatible with 3 or 4 wire SPI.

The ADT7310 transmits 16 bits during each SPI read.

The bits are signed, with bit 15 representing the sign (1 = negative temperature).

🔹 SPI word structure (16 bits)

Bits Name
 Description
[15] Sign 0 = + / 1 = −
[14 → 0] Temperature (15 bits) Data × (1 / 128 °F)
🔹 Conversion equation

T (°C) = Valeur / 128


Example:

SPI Reading → 0x19A0

0x19A0 = 6560₁₀ 

T = 6560 / 128 = 51,25 °C

✅ Measured temperature = 51.25 °C


🔹 Resolution modes

Mode Bits LSB (°C)
13 bits 0,0625 30 ms
14 bits 0,03125 60 ms
15 bits 0,0156 120 ms
16 bits 0,0078 240 ms

💡 The user can adjust the accuracy / speed via the configuration register (0x01).

The ADT7310 connects to any standard SPI microcontroller (Arduino, STM32, ESP32, Raspberry Pi, etc.).

It allows for complete configuration via registers: mode, resolution, alarm thresholds, and interrupt.

🔹 Typical components

Component
 Function
ADT7310 High-precision SPI digital sensor
Microcontroller
 SPI Reading and Configuration
100 nF capacitor
 Decoupling on VDD
Pull-up resistor (10 kΩ)
 Sur INT et CS (optionnel)
RC filter (optional)
 Pour immunité EMI accrue
Stable power supply 3.3 or 5 V
 Référence thermique stable
🔹 Schéma fonctionnel (ASCII)
           +3.3V / +5V
              │
           [ADT7310]
              │
     DOUT ─────► MISO (MCU)
     DIN  ◄──── MOSI (MCU)
     SCLK ◄──── SCK  (MCU)
     CS   ◄──── GPIO (MCU)
     INT  ─────► GPIO (option)
     GND  ───── GND

💡 Le signal INT peut être configuré pour alerter en cas de dépassement de seuil de température.

🔹 Principe de fonctionnement

1️⃣ Le microcontrôleur active CS et envoie la commande de lecture.

2️⃣ Le ADT7310 renvoie 16 bits correspondant à la température.

3️⃣ Si le mode alarme est activé, la sortie INT passe à l’état bas lorsque la température dépasse le seuil programmé.

4️⃣ Le capteur peut être mis en shutdown automatique entre deux mesures pour réduire la consommation.

Avantage Description
🧠 Précision métrologique ±0,25 K Idéal pour laboratoires et industries critiques
⚙️ Résolution configurable jusqu’à 16 bits Permet d’ajuster la vitesse et la précision
💡 Mode alarme programmable (INT/CT) Surveillance autonome sans MCU actif
🔋 Faible consommation (210 µA) Compatible systèmes basse énergie
🔧 SPI universel 3 ou 4 fils Interfaçage direct avec la plupart des MCU
🧱 Auto-calibré et stable Aucun étalonnage nécessaire, dérive < ±0,05 K/an

 We integrate any sensor into any probe 

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Termal block

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Stick-in

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Thread

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Jacketed

PCBA Design

PCBA design

Winding probe

Winding

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