ST STM32H7 3 Series User Manual

DocID029918 Rev 1 15/48
AN4938 Power supplies
47
Figure 7. Reset circuit
1.3.5 Internal reset ON
On the packages embedding the PDR_ON pin, the power supply supervisor is enabled by
holding PDR_ON high. On the other packages, the power supply supervisor is always
enabled.
For more details about the internal reset ON, refer to the datasheets.
1.3.6 Internal reset OFF
This feature is available only on the packages featuring the PDR_ON pin. The internal
power-on reset (POR) / power-down reset (PDR) circuitry is disabled through the PDR_ON
pin.
An external power supply supervisor should monitor V
DD
and NRST and should maintain
the device in reset mode as long as V
DD
is below a specified threshold. PDR_ON should be
connected to V
SS
. Refer to Figure 8: Power supply supervisor interconnection with internal
reset OFF.
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ST STM32H7 3 Series Specifications

General

Brand	ST
Model	STM32H7 3 Series
Category	Microcontrollers
Language	English