How to replace LDO regulator with green LED

In a system, the microcontroller must communicate with peripherals operating at different supply voltages. This design idea describes how for a low power load, a green LED can replace the level shifting circuit in a 1.8V LDO regulator, and the system must be implemented in a microcontroller with peripherals operating at different supply voltages. For communication, you may need to add a level shifter (such as the MAX1840). This device requires two digital signals (V CC and DV CC ) to process the digital signal flowing between the serial peripheral and the microcontroller.

A typical requirement is to translate an I 2 C, SPITM, or 1-Wire channel from 3.5V to 1.8V. Logic High This system typically provides a low dropout voltage (LDO) regulation voltage for each supply, and each LDO also requires two bypass capacitors, connected to one of the supply and output pins.

However, for low cost, limited space-constrained portable devices, we can eliminate the 1.8V LDO and bypass capacitor CC and V CC pins by simply placing the green LED (case size 0603) across the flat conversion DV. (Figure 1) Figure 1. For low power loads, a green LED (D1) is substituted for the 1.8V LDO regulator in this level shifting circuit. The V CC is configured on this pin assuming that the translation is allowed to provide a 1.8V-1.9V, voltage from the device's logic high. To ensure a stable V CC , the slave operates at low power and draws a reasonable supply current.

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