Figure 62: Minimalistic Power Supply Reference Schematics
Please note that this circuit is not compliant with the USB specifications. An additional circuit is
required that detects whether the USB power source can deliver enough current and the system
does not exceed these limits. This can be achieved by a USB BC 1.2 detection IC or - in case of an
USB-C power source - a USB PD detection IC.
3.4.3 Single Cell Battery Power Approach
The wide input voltage range of the Verdin module allows it to run directly form a single cell Li-ion
battery. This makes it much easier to implement a rechargeable battery solution for the Verdin
module. When charging a regular Li-ion battery, the voltage rises to maximum 4.4V. The cell gets
damaged when it gets discharged below 2.5V. The Verdin module runs guaranteed down to a
minimum input voltage of 3.135V. Battery voltages falling between 3.135V and 2.5V represent a
capacity reserve that cannot be used up with Verdin modules. While this represents only a very
small portion of total battery capacity, it also helps to prevent battery deep discharge events from
happening.
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