STM32F427AI datasheet(101/240 Pages) STMICROELECTRONICS

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DS9405 Rev 12

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STM32F427xx STM32F429xx

Electrical characteristics

197

6.3.7

Supply current characteristics

The current consumption is a function of several parameters and factors such as the

operating voltage, ambient temperature, I/O pin loading, device software configuration,

operating frequencies, I/O pin switching rate, program location in memory and executed

binary code.

The current consumption is measured as described in Figure 23: Current consumption

measurement scheme.

All the run-mode current consumption measurements given in this section are performed

with a reduced code that gives a consumption equivalent to CoreMark code.

Typical and maximum current consumption

The MCU is placed under the following conditions:

•

All I/O pins are in input mode with a static value at VDD or VSS (no load).

•

All peripherals are disabled except if it is explicitly mentioned.

•

The flash memory access time is adjusted both to fHCLK frequency and VDD range (see

Table 18: Limitations depending on the operating power supply range).

•

Regulator ON

•

The voltage scaling and overdrive mode are adjusted to fHCLK frequency as follows:

–

Scale 3 for fHCLK ≤ 120 MHz

–

Scale 2 for 120 MHz < fHCLK ≤ 144 MHz

–

Scale 1 for 144 MHz < fHCLK ≤ 180 MHz. The overdrive is only ON at 180 MHz.

•

The system clock is HCLK, fPCLK1 = fHCLK/4, and fPCLK2 = fHCLK/2.

•

The external clock frequency is 4 MHz and PLL is ON when fHCLK is higher than

25 MHz.

•

The maximum values are obtained for VDD = 3.6 V and a maximum ambient

temperature (TA), and the typical values for TA= 25 °C and VDD = 3.3 V unless

otherwise specified.

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