TMP102 Digital Temp Sensor

Name: TMP102 Digital Temp Sensor
Brand: Texas Instruments
Availability: InStock

TMP102

Texas Instrumentssensor environment

TMP102 is a digital temperature sensor with SMBus, two-wire, and I2C interface compatibility, designed for portable electronics and power-supply temperature monitoring.

Manufacturer datasheet

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In stock

Specifications

Operating Voltage: 1.4V to 3.6V
Supply Current: 7.5µA (active), 0.35µA (shutdown) (max)
Interface: I2C, SMBus, two-wire
Resolution: 12 bits
Range: -40°C to 125°C
Accuracy: ±0.5°C (25°C to 85°C), ±1°C (-40°C to 125°C) (max)
Temperature Range: -55°C to 150°C
Package: SOT563 (1.6mm × 1.6mm)

Pinout

Pin	Name	Functions	Notes
1	SCL	I2CSPI	Serial clock
2	GND	GND	Ground
3	ALERT	GPIO	Overtemperature alert. Open-drain output; requires a pullup resistor.
4	ADD0	GPIO	Address select. Connect to GND or V+
5	V+	POWER	Supply voltage, 1.4 V to 3.6 V
6	SDA	I2CSPI	Serial data. Open-drain output; requires a pullup resistor.

Interactive pinout

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TMP102

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Starter code

Community starter examples — minimal, unofficial, and provided to get you wiring fast. Verify against the manufacturer datasheet before relying on them.

Arduino (C++)

arduino

// TMP102 I2C temperature sensor — community starter example
// No library needed: read the 12-bit temperature register (0x00).
#include <Wire.h>

const byte ADDR = 0x48;   // ADD0 -> GND

float readTempC() {
  Wire.beginTransmission(ADDR);
  Wire.write(0x00);                 // temperature register
  Wire.endTransmission();
  Wire.requestFrom(ADDR, (byte)2);
  int raw = (Wire.read() << 4) | (Wire.read() >> 4);   // 12-bit
  return raw * 0.0625;
}

void setup() {
  Serial.begin(115200);
  Wire.begin();
}

void loop() {
  Serial.print(readTempC()); Serial.println(" C");
  delay(1000);
}

MicroPython

python

# TMP102 (ESP32) — community starter example
# No driver needed: read the 12-bit temp register
from machine import Pin, I2C
import time

i2c = I2C(0, scl=Pin(22), sda=Pin(21))
ADDR = 0x48

while True:
    d = i2c.readfrom_mem(ADDR, 0x00, 2)
    raw = (d[0] << 4) | (d[1] >> 4)
    print(raw * 0.0625, "C")
    time.sleep(1)

Wiring

Pin	Arduino Uno R3	ESP32 DevKitC (WROOM-32)	Notes
V+	+3V3	3V3	1.4-3.6 V part - do NOT use 5 V
GND	GND	GND
SCL	A5/SCL	GPIO22	I2C clock
SDA	A4/SDA	GPIO21	I2C data
ADD0	GND	GND	Address select -> 0x48

Typical uses

Low-power digital temperature
Board / battery temperature monitoring