ST STM32F4 Series Getting Started

DocID026304 Rev 3 13/44
AN4488 Power supplies
43
Figure 6. PDR_ON timings example
(not to scale, not needed for STM32F411xx and STM32F446xx)
Selection of PDR_ON voltage supervisor
Voltage supervisor should have the following characteristics
• Reset output active-high push-pull (output driving high when voltage is below trip
point)
• Supervisor trip point including tolerances and hysteresis should fit the expected V
DD
range.
Notice that supervisor spec usually specify trip point for falling supply, so hysteresis
should be added to check the power on phase.
Example:
– Voltage regulator 1.8V +/- 5% mean V
DD
min1.71V
– Supervisor specified at 1.66V +/- 2.5% with an hysteresis of 0.5% mean
- rising trip max = 1.71V (1.66V + 2.5% + 0.5%)
- falling trip min = 1.62V (1.66V - 2.5%).
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ST STM32F4 Series Specifications

General

Brand	ST
Model	STM32F4 Series
Category	Computer Hardware
Language	English