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LQFP64 Datasheet(PDF) 82 Page - STMicroelectronics

Part # LQFP64
Description  Arm® Cortex®-M4 32b MCUFPU, 210DMIPS, up to 1MB Flash/1924KB RAM, USB OTG HS/FS, Ethernet, 17 TIMs, 3 ADCs, 15 comm. interfaces & camera
PDF  204 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

LQFP64 Datasheet(HTML) 82 Page - STMicroelectronics

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Electrical characteristics
STM32F405xx, STM32F407xx
82/203
DS8626 Rev 9
5.3.2
VCAP_1/VCAP_2 external capacitor
Stabilization for the main regulator is achieved by connecting an external capacitor CEXT to
the VCAP_1/VCAP_2 pins. CEXT is specified in Table 16.
Figure 23. External capacitor CEXT
1. Legend: ESR is the equivalent series resistance.
5.3.3
Operating conditions at power-up / power-down (regulator ON)
Subject to general operating conditions for TA.
5.3.4
Operating conditions at power-up / power-down (regulator OFF)
Subject to general operating conditions for TA.
Table 16. VCAP_1/VCAP_2 operating conditions(1)
1. When bypassing the voltage regulator, the two 2.2 µF VCAP capacitors are not required and should be
replaced by two 100 nF decoupling capacitors.
Symbol
Parameter
Conditions
CEXT
Capacitance of external capacitor
2.2 µF
ESR
ESR of external capacitor
< 2
Ω
MS19044V2
ESR
R Leak
C
Table 17. Operating conditions at power-up / power-down (regulator ON)
Symbol
Parameter
Min
Max
Unit
tVDD
VDD rise time rate
20
∞
µs/V
VDD fall time rate
20
∞
Table 18. Operating conditions at power-up / power-down (regulator OFF)(1)
1. To reset the internal logic at power-down, a reset must be applied on pin PA0 when VDD reach below
minimum value of V12.
Symbol
Parameter
Conditions
Min
Max
Unit
tVDD
VDD rise time rate
Power-up
20
∞
µs/V
VDD fall time rate
Power-down
20
∞
tVCAP
VCAP_1 and VCAP_2 rise time
rate
Power-up
20
∞
VCAP_1 and VCAP_2 fall time
rate
Power-down
20
∞



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