Datasheet

DocID026284 Rev 4 61/128
STM32F091xB STM32F091xC Electrical characteristics
99
Typical current consumption
The MCU is placed under the following conditions:
• V
DD
= V
DDA
= 3.3 V
• All I/O pins are in analog input configuration
• The Flash memory access time is adjusted to f
HCLK
frequency:
– 0 wait state and Prefetch OFF from 0 to 24 MHz
– 1 wait state and Prefetch ON above 24 MHz
• When the peripherals are enabled, f
PCLK
= f
HCLK
• PLL is used for frequencies greater than 8 MHz
• AHB prescaler of 2, 4, 8 and 16 is used for the frequencies 4 MHz, 2 MHz, 1 MHz and
500 kHz respectively
Table 32. Typical and maximum current consumption from the V
BAT
supply
Symbol Parameter Conditions
Typ @ V
BAT
Max
(1)
Unit
1.65 V
1.8 V 2.4 V
2.7 V
3.3 V 3.6 V
T
A
=
25 °C
T
A
=
85 °C
T
A
=
105 °C
I
DD
_
VBAT
RTC
domain
supply
current
LSE & RTC ON; “Xtal
mode”: lower driving
capability;
LSEDRV[1:0] = '00'
0.5 0.5 0.6 0.7 0.9 1.0 1.0 1.3 1.8
µA
LSE & RTC ON; “Xtal
mode” higher driving
capability;
LSEDRV[1:0] = '11'
0.8 0.8 0.9 1.0 1.2 1.3 1.4 1.7 2.2
1. Data based on characterization results, not tested in production.
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