Operation

STM809/810/811/812

8/21

Doc ID 9873 Rev 5

2.4

becomes an open circuit. In most systems this is not a problem, as most MCUs do not

operate below 1 V. However, in applications where RST output must be valid down to 0 V, a

pull-down resistor may be added to hold the RST output low. This resistor must be large

enough to not load the RST output, and still be small enough to pull the output to ground. A

100 k

Ω resistor is recommended.

Note:

The same situation applies for the active-high RST of the STM810/812. A 100 k