STM32L021D4 datasheet(16/114 Pages) STMICROELECTRONICS

Part #	STM32L021D4

Description	Access line ultra-low-power 32-bit MCU Arm®-based Cortex®-M0, 16KB Flash, 2KB SRAM, 512B EEPROM, ADC, AES

PDF	114 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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Functional overview

STM32L021x4

16/114

DocID027982 Rev 5

Table 2. Functionalities depending on the operating power supply range

Operating power supply range

Functionalities depending on the operating power

supply range

ADC operation

Dynamic voltage scaling

range

VDD = 1.65 to 1.71 V

ADC only, conversion time

up to 570 ksps

Range 2 or

range 3

VDD = 1.71 to 1.8 V(1)

1. CPU frequency changes from initial to final must respect the condition: fCPU initial <4fCPU initial. It must also

respect 5 μs delay between two changes. For example to switch from 4.2 MHz to 32 MHz, you can switch

from 4.2 MHz to 16 MHz, wait 5 μs, then switch from 16 MHz to 32 MHz.

ADC only, conversion time

up to 1.14 Msps

Range 1, range 2 or range 3

VDD = 1.8 to 2.0 V(1)

Conversion time up to 1.14

Msps

Range1, range 2 or range 3

VDD = 2.0 to 2.4 V

Conversion time up to 1.14

Msps

Range 1, range 2 or range 3

VDD = 2.4 to 3.6 V

Conversion time up to 1.14

Msps

Range 1, range 2 or range 3

Table 3. CPU frequency range depending on dynamic voltage scaling

CPU frequency range

Dynamic voltage scaling range

16 MHz to 32 MHz (1ws)

32 kHz to 16 MHz (0ws)

Range 1

8 MHz to 16 MHz (1ws)

32 kHz to 8 MHz (0ws)

Range 2

32 kHz to 4.2 MHz (0ws)

Range 3

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