Texas Instruments recommends a 2-layer or 4-layer PCB with a solid ground plane and a thermal relief pattern under the IC to improve thermal performance. A detailed layout guide can be found in the application note 'LM56/LM56C/LM57/LM57C Thermal Layout Guidelines' (SLVA485).
To ensure accurate temperature measurement in a noisy environment, it is recommended to use a low-pass filter on the VOUT pin, such as a 1 kΩ resistor and a 10 nF capacitor. Additionally, using a shielded cable and a ground plane on the PCB can help reduce noise coupling.
Although the datasheet specifies a maximum VCC of 5.5V, it is recommended to limit the voltage to 5V or less to ensure reliable operation and to prevent damage to the internal voltage regulator.
Yes, the LM56CIMMX/NOPB can be used in a battery-powered device. However, it is recommended to use a low-dropout voltage regulator (LDO) to regulate the supply voltage to the LM56CIMMX/NOPB, as the device has a relatively high quiescent current (IQ) of 150 μA.
To calibrate the temperature sensor for high accuracy, it is recommended to use a precision temperature reference, such as a thermocouple or a platinum RTD, and to perform a 2-point or 3-point calibration. The calibration process can be done using a microcontroller or a dedicated calibration device.
LM56CIMMX/NOPB datasheet
by Texas Instruments
