1.1 Objective
The objective of this demo is to demonstrate the extremely low-power consumption of VREFLP and CMPLP. To demonstrate these, a temperature alarm was created with a Negative Temperature Coefficient (NTC) thermistor as the input signal. When the thermistor is heated, the resistance drops, triggering the temperature alarm. In this case, an LED turns on to indicate that the peripheral triggered. This type of application could be used in cold asset tracking or temperature monitoring of packages, with the LED replaced with EEPROM or another indicator.
A precision current measurement system was utilized to demonstrate the current consumption of the microcontroller and its peripherals. The microcontroller is powered at 1.8V to minimize power consumption. The current is being measured through an external circuit using a precision current mirror and a 24-bit ADC. A secondary microcontroller in the system communicates with the 24-bit Sigma-Delta (ΣΔ) ADC (MCP3564R) to measure the current consumption and display the results on an OLED screen. The figure below shows a simplified block diagram of the system.
