4-20mA Current Loop Transmitter

The 4-20mA current loop is the dominant standard for sensor systems across many industries due to its simplicity and efficiency. It is easy to configure and connect, requiring less wiring and fewer connections than other signal types, which helps reduce overall system costs. Additionally, it is ideal for large locations, as the current remains stable over long distances, unlike voltage signals that degrade.

This current loop transmitter design utilizes a precision digital power monitor (DPM), a stable power source, and the low-power, analog-rich capabilities of the 16-bit MCU.

System Benefits:

• Analog and ultra-low power MCU optimized for detector and sensor applications.
• High-voltage, adjustable V_OUT, low quiescent current linear regulator suitable for "always-on" applications
• Renesas' NanoPower voltage reference featuring low supply voltage operation at 310nA typical.