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AN4488 데이터시트(PDF) 13 Page - STMicroelectronics

부품명 AN4488
상세설명  Getting started with STM32F4xxxx MCU hardware development
PDF  44 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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AN4488 데이터시트(HTML) 13 Page - STMicroelectronics

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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 VDD
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 VDD 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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