STM32L021D4 datasheet(69/114 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

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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STM32L021x4

Electrical characteristics

6.3.8

PLL characteristics

The parameters given in Table 40 are derived from tests performed under ambient

temperature and VDD supply voltage conditions summarized in Table 17.

tSU(MSI)

MSI oscillator startup time

MSI range 0

µs

MSI range 1

MSI range 2

MSI range 3

MSI range 4

MSI range 5

MSI range 6,

Voltage range 1

and 2

3.5

MSI range 6,

Voltage range 3

tSTAB(MSI)(2) MSI oscillator stabilization time

MSI range 0

µs

MSI range 1

MSI range 2

MSI range 3

MSI range 4

2.5

MSI range 5

MSI range 6,

Voltage range 1

and 2

-2

MSI range 3,

Voltage range 3

-3

fOVER(MSI)

MSI oscillator frequency overshoot

Any range to

range 5

-4

MHz

Any range to

range 6

-6

1. This is a deviation for an individual part, once the initial frequency has been measured.

2. Guaranteed by characterization results, not tested in production.

Table 39. MSI oscillator characteristics (continued)

Symbol

Parameter

Condition

Typ

Max Unit

Table 40. PLL characteristics

Symbol

Parameter

Value

Unit

Min

Typ

Max(1)

fPLL_IN

PLL input clock(2)

MHz

PLL input clock duty cycle

STM32L021D4 Datasheet(PDF) 69 Page - STMicroelectronics

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