The maximum cable length for the I2C bus is not strictly specified, but it's generally recommended to keep it under 10 meters (33 feet) to ensure reliable communication. However, the actual maximum length will depend on the specific application, cable quality, and noise environment.
To handle multiple LM75BIM-5 devices on the same I2C bus, you need to use a unique address for each device. The LM75BIM-5 has three address pins (A0, A1, and A2) that can be connected to VCC, GND, or left floating to create up to 8 unique addresses. Make sure to use a different address for each device and configure your I2C master accordingly.
The LM75BIM-5 has an accuracy of ±2°C from -25°C to 100°C, and ±3°C from -55°C to 125°C. However, this accuracy can be affected by various factors such as self-heating, thermal gradients, and noise. To achieve the highest accuracy, it's recommended to use a high-quality thermal interface material and ensure good thermal coupling between the device and the temperature source.
The LM75BIM-5 outputs temperature data in a 9-bit, two's complement format. To convert this data to Celsius, you can use the following formula: Temperature (°C) = (Sensor Data x 0.5) - 50. To convert to Fahrenheit, use the following formula: Temperature (°F) = (Temperature in °C x 1.8) + 32.
The power-on default state of the LM75BIM-5 is that the device is in shutdown mode, and the I2C interface is inactive. After power-on, the device will remain in shutdown mode until it receives a valid I2C command to exit shutdown mode.
LM75BIM-5 datasheet
by Texas Instruments
