ADT7410 | GUILCOR SENSORS

ADT7410
Temperature sensors

High-resolution digital temperature sensor with fast conversion and I²C interface for industrial applications.

Measurement range
-55 / 150°C

Temperature accuracy
+/- 0,25°K

Resolution (Rh and T°)
13 or 16 bits

Power supply voltage
2,7 → 5,5V

Conversion time
6ms / 6,5ms

Typical current
240µA(active)

I²C Speed
0x48

Price
High

What is a ADT7410 sensor ?

The ADT7410 is a high-precision digital temperature sensor designed by Analog Devices, known for its metrological stability and exceptional linearity.

It is a factory-calibrated sensor, directly readable on the I²C or SMBus, and capable of outputting data in 16-bit signed format (resolution of 0.0078 °C per LSB).

It is used in professional measurement chains, medical systems, or calibration instruments.

Operating principle

The ADT7410 is based on a calibrated diode sensor and a 16-bit ΔΣ converter.

Each sample is processed digitally, linearized, and compensated before transmission.

Standard conversion formula:

T(°C) = Signed codex / 128

(in 16-bit mode)

💡 Each bit represents 1/128 °C, or approximately 0.0078 °C of resolution.

Example of conversion

Signed hex value	Temperature (°C)
0x0000	0,0
0x0800	16,0
0x1900	50,0
0x3200	100,0
0x7D00	250,0

🧮 Format 16-bit signed, 2 bytes (MSB/LSB).

Principle diagram (I2C connection)

+3.3V
 │
[ADT7410]
 │ SDA ─────────┐
 │ SCL ─────────┤── [I²C Microcontroller]
 │ A0 / A1 ─────┘ (address configuration)
 │ GND

💡 Configurable address: 0x48 → 0x4B via A0/A1.

Application areas

🧠 Scientific and metrological instrumentation

🏥 Medical and thermal devices

⚙️ Precise industrial control and HVAC

🧪 Calibration and adjustment of measurement chains

🔋 Portable devices requiring stability and precision

Should I choose a ADT7410 sensor ?

Strengths points

🎯 Metrological precision ±0.25 K
→ Comparable to the TMP117 and MCP9808, ideal for certified measurements.
🧠 16-bit resolution
→ A fineness of 0.0078 °C per LSB, perfect for detecting micro-thermal variations.
⚙️ Factory calibrated and compensated
→ No software calibration required, plug & play via I²C.
📉 Very low drift over time
→ Typically <0.05 K/year, excellent for long-term stability.

Weaknesses points

🌡️ Slow conversion time (16-bit mode)
→ Up to 240 ms, therefore not well suited for rapid measurements.
📡 Interface only I²C/SMBus
→ No SPI version available.
💸 Slightly higher price
→ But justified by its precision and industrial certification.

Useful information

Here is some useful information regarding the ADT7410 sensors.

Main Registers

Adress (hex)	Name	Function
0x00 / 0x01	Temperature MSB/LSB	Temperature data (16-bit signed)
0x02	Status	Indicate the end of conversion
0x03	Configuration	Resolution, mode, polarity
0x04	T_HIGH	High alert threshold
0x05	T_LOW	Low alert threshold
0x06	T_CRIT	Critical threshold
0x07	Hysteresis	Hysteresis for alerts
0x0B	ID	Component ID

I²C Reading Example (pseudo-code)

i2c_start();
i2c_write(0x48 << 1);
i2c_write(0x00);
i2c_start();
i2c_write((0x48 << 1) | 1);
MSB = i2c_read_ack();
LSB = i2c_read_nack();
i2c_stop();

raw = (MSB << 8) | LSB;
if (raw & 0x8000) raw -= 65536; // Signed value
temp = raw / 128.0; // Mode 16 bits

✅ Exemple :

MSB = 0x19, LSB = 0x00 → (0x1900 / 128) = 50,0 °C

Typical integration diagram

3.3V ───────────┐ │ [ADT7410] │ SDA ───────┐ │ SCL ───────┤── MCU (Arduino, ESP32, STM32…) │ ALERT ─────┘ (alert exit) │ GND

💡 The ALERT output can signal threshold exceedances or sensor errors.

Configuration Register (0x03)

Bit	NAme	Description
[7]	Fault queue	1 to 4 measures before alert
[6]	CT polarity	Alert output polarity
[5]	INT polarity	Comparator/Interrupt Mode
[4]	Resolution	0 = 13 bits / 1 = 16 bits
[3:2]	Operation mode	00 = continue / 01 = standby / 10 = one-shot
[1:0]	Reserved	—