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AN4488 Datasheet(PDF) 17 Page - STMicroelectronics

Part # AN4488
Description  Getting started with STM32F4xxxx MCU hardware development
PDF  44 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4488 Datasheet(HTML) 17 Page - STMicroelectronics

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AN4488
Power supplies
43
The following conditions must be respected:
•
VDD should always be higher than VCAP to avoid current injection between power
domains.
•
If the time for VCAP to reach V12 minimum value is smaller than the time for VDD to
reach 1.7 V, then PA0 should be kept low to cover both conditions: until VCAP reaches
V12 minimum value and until VDD reaches 1.7 V.
•
Otherwise, if the time for VCAP to reach V12 minimum value is smaller than the time for
VDD to reach 1.7 V, then PA0 could be asserted low externally.
•
If VCAP goes below V12 minimum value and VDD is higher than 1.7 V, then PA0 must
be asserted low externally.
2.3.7
Regulator ON/OFF and internal reset ON/OFF availability
Table 3. Regulator ON/OFF and internal power supply supervisor availability
Package
pins
Regulator ON
Regulator OFF
Power supply
supervisor ON
Power supply
supervisor OFF
Packages with
pins on 4 edges
48
Yes(1)
No
Yes(2)
No
64
100
144
Yes
PDR_ON set to VDD
Yes
PDR_ON external
control(3)
176
Yes(4)
Yes(5)
208
Yes(1)
No
BGA Packages
100
Yes(4)
Yes(5)
144
169
176
216
Chip Scale
Packages
49
Yes(1)
No
81
Yes(4)
Yes(5)
90
143
1. BYPASS_REG internally connected to VSS
2. PDR_ON internally connected to VDD
3. PDR_ON can be permanently set to VSS for STM32F411xx and STM32F446xx devices. For other devices, see Chapter
2.3.4
4. BYPASS_REG set to VSS
5. BYPASS_REG set to VDD



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