STM32F732IE datasheet(32/226 Pages) STMICROELECTRONICS

32 / 226 page

Functional overview

STM32F732xx STM32F733xx

32/226

DS11854 Rev 6

When the regulator is OFF, there is no more internal monitoring on V12. An external power

supply supervisor can be used to monitor the V12 of the logic power domain. The PA0 pin

can be used for this purpose, and act as power-on reset on V12 power domain.

In regulator OFF mode, the following features are no more supported:

•

PA0 cannot be used as a GPIO pin since it is used to reset a part of the V12 logic power

domain which is not reset by the NRST pin.

•

As long as PA0 is kept low, the debug mode cannot be used under power-on reset.

As a consequence, PA0 and NRST pins must be managed separately if the debug

connection under reset or pre-reset is required.

•

The over-drive and under-drive modes are not available.

•

The Standby mode is not available.

Figure 11. Regulator OFF

The following conditions must be respected:

•

VDD must always be higher than VCAP_1 and VCAP_2 to avoid current injection between

power domains.

•

If the time for VCAP_1 and VCAP_2 to reach V12 minimum value is faster than the time

for VDD to reach 1.7 V, then PA0 must be kept low to cover both conditions: until

VCAP_1 and VCAP_2 reach V12 minimum value and until VDD reaches 1.7 V

(see Figure 12).

•

Otherwise, if the time for VCAP_1 and VCAP_2 to reach V12 minimum value is slower

than the time for VDD to reach 1.7 V, then PA0 can be asserted low externally

(see Figure 13).

•

If VCAP_1 and VCAP_2 go below V12 minimum value, and VDD is higher than 1.7 V, then

a reset must be asserted on PA0 pin.

Note:

The minimum value of V12 depends on the maximum frequency targeted in the application.

On the LQFP64 pin package, the VCAP_2 is not available.

ai18498V3

BYPASS_REG

VCAP_1

VCAP_2

PA0

V12

VDD

NRST

VDD

Application reset

signal (optional)

External VCAP_1/2 power

supply supervisor

Ext. reset controller active

when VCAP_1/2 < Min V12

V12

STM32F732IE Arkusz danych(PDF) 32 Page - STMicroelectronics

STM32F732IE Arkusz danych(HTML) 32 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Arkusz danych Pobierz

Link URL