STM32L021D4 datasheet(61/114 Pages) STMICROELECTRONICS

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STM32L021x4

Electrical characteristics

Table 31. Peripheral current consumption in run or Sleep mode(1)

1. Data based on differential IDD measurement between all peripherals OFF an one peripheral with clock

enabled, in the following conditions: fHCLK = 32 MHz (range 1), fHCLK = 16 MHz (range 2), fHCLK = 4 MHz

(range 3), fHCLK = 64kHz (Low-power run/sleep), fAPB1 = fHCLK, fAPB2 = fHCLK, default prescaler value for

each peripheral. The CPU is in Sleep mode in both cases. No I/O pins toggling. Not tested in production.

Peripheral

Typical consumption, VDD = 3.0 V, TA = 25 °C

Unit

Range 1,

VCORE=1.8 V

VOS[1:0] = 01

Range 2,

VCORE=1.5 V

VOS[1:0] = 10

Range 3,

VCORE=1.2 V

VOS[1:0] = 11

Low-power

sleep and

run

APB1

WWDG

2.5

1.6

µA/MHz

(fHCLK)

LPUART1

8.3

7.2

5.4

7.2

I2C1

8.2

6.8

8.9

LPTIM1

8.7

TIM2

10.5

8.5

6.4

8.5

USART2

8.5

6.8

5.4

7.1

APB2

ADC1(2)

2. HSI oscillator is OFF for this measure.

5.0

3.9

3.3

µA/MHz

(fHCLK)

SPI1

4.5

3.5

2.9

3.6

TIM21

6.8

6.1

4.5

5.6

DBGMCU

1.7

1.1

1.4

SYSCFG/

COMP

2.5

2.4

1.6

2.3

Cortex-

M0+ core

I/O port

GPIOA

7.6

6.3

4.9

6.5

µA/MHz

(fHCLK)

GPIOB

5.1

4.1

3.2

GPIOC

1.1

0.7

0.6

0.8

AHB

CRC

1.5

1.1

1.2

µA/MHz

(fHCLK)

FLASH(3)

3. These values correspond to the Flash memory dynamic current consumption. The Flash memory static

consumption (Flash memory ON) equals 12 µA and does not depend on the frequency.

The Flash memory consumption is already taken into account in all the supply current consumption tables

(Flash memory ON cases).

8.5

AES

3.6

3.0

2.4

2.8

DMA1

5.3

4.2

3.5

4.8

All enabled

PWR

2.1

1.9

1.4

1.8

µA/MHz

(fHCLK)

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