Datasheet

DocID029041 Rev 6 129/255
STM32F765xx STM32F767xx STM32F768Ax STM32F769xx Electrical characteristics
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I/O system current consumption
The current consumption of the I/O system has two components: static and dynamic.
I/O static current consumption
All the I/Os used as inputs with pull-up generate a current consumption when the pin is
externally held low. The value of this current consumption can be simply computed by using
the pull-up/pull-down resistors values given in
Table 66: I/O static characteristics.
For the output pins, any external pull-down or external load must also be considered to
estimate the current consumption.
An additional I/O current consumption is due to I/Os configured as inputs if an intermediate
voltage level is externally applied. This current consumption is caused by the input Schmitt
trigger circuits used to discriminate the input value. Unless this specific configuration is
required by the application, this supply current consumption can be avoided by configuring
these I/Os in analog mode. This is notably the case of ADC input pins which should be
configured as analog inputs.
Table 38. Typical and maximum current consumptions in V
BAT
mode
Symbol Parameter Conditions
(1)
Typ Max
(2)
Unit
T
A
=25 °C T
A
=85 °C T
A
=105 °C
V
BAT
=
1.7 V
V
BAT
=
2.4 V
V
BAT
=
3.3 V
V
BAT
= 3.6 V
I
DD_VBAT
Supply current
in V
BAT
mode
Backup SRAM OFF, RTC and
LSE OFF
0.03 0.04 0.04 0.2 0.4
µA
Backup SRAM ON, RTC and
LSE OFF
0.77 0.78 0.83 3.2 7.4
Backup SRAM OFF, RTC ON
and LSE in low drive mode
0.62 0.8 1.13 4.4 10.2
Backup SRAM OFF, RTC ON
and LSE in medium low drive
mode
0.65 0.83 1.17 4.6 10.6
Backup SRAM OFF, RTC ON
and LSE in medium high drive
mode
0.75 0.94 1.28 5.0 11.4
Backup SRAM OFF, RTC ON
and LSE in high drive mode
0.9 1.08 1.43 5.5 12.8
Backup SRAM ON, RTC ON and
LSE in low drive mode
1.35 1.54 1.91 7.3 17.2
Backup SRAM ON, RTC ON and
LSE in Medium low drive mode
1.38 1.57 1.93 7.9 18.4
Backup SRAM ON, RTC ON and
LSE in Medium high drive mode
1.53 1.73 2.11 8.0 18.7
Backup SRAM ON, RTC ON and
LSE in High drive mode
1.67 1.87 2.26 9.0 21.0
1. Crystal used: Abracon ABS07-120-32.768 kHz-T with a C
L
of 6 pF for typical values.
2. Guaranteed by characterization results.
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