STM32L021D4 datasheet(52/114 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32L021x4

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DocID027982 Rev 5

6.3.4

Supply current characteristics

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

operating voltage, 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 12: Current consumption

measurement scheme.

All Run-mode current consumption measurements given in this section are performed with a

reduced code that gives a consumption equivalent to Dhrystone 2.1 code if not specified

otherwise.

The current consumption values are derived from the tests performed under ambient

temperature and VDD supply voltage conditions summarized in Table 17: General operating

conditions unless otherwise specified.

The MCU is placed under the following conditions:

•

All I/O pins are configured in analog input mode

•

All peripherals are disabled except when explicitly mentioned

•

The Flash memory access time and prefetch is adjusted depending on fHCLK frequency

and voltage range to provide the best CPU performance unless otherwise specified.

•

When the peripherals are enabled fAPB1 = fAPB2 = fAPB

•

When PLL is ON, the PLL inputs are equal to HSI = 16 MHz (if internal clock is used) or

HSE = 16 MHz (if HSE bypass mode is used)

•

The HSE user clock is applied to CK_IN. It follows the characteristic specified in

Table 34: High-speed external user clock characteristics

•

For maximum current consumption VDD = VDDA = 3.6 V is applied to all supply pins

•

For typical current consumption VDD = VDDA = 3.0 V is applied to all supply pins if not

specified otherwise

4. Guaranteed by design, not tested in production.

5. Shortest sampling time can be determined in the application by multiple iterations.

6. To guarantee less than 1% VREF_OUT deviation.

STM32L021D4 Datenblatt(PDF) 52 Page - STMicroelectronics