STM32U535NET6QTR datasheet(193/278 Pages) STMICROELECTRONICS

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DS14217 Rev 1

193/278

STM32U535xx

Electrical characteristics

253

High-speed internal 48 MHz (HSI48) RC oscillator

IDD(MSI)(3)

MSI oscillator

power

consumption

Continuous

mode(7)

LDO

MSI range 0 to 3

21 + 2.5

µA/MHz

µA

MSI range 4 to 15

19 + 2.5

µA/MHz

SMPS(9)

MSI range 0 to 3

21 + 1,3

µA/MHz

MSI range 4 to 15

19 + 1,3

µA/MHz

Sampling

mode(8)

LDO

Range 0 to 3

3 + 2.5

µA/MHz

Range 4 to 15

1 +

2.5µA/

MHz

SMPS

Range 0 to 3

3 + 1

µA/MHz

Range 4 to 15

1 + 1

µA/MHz

1. Evaluated by characterization and not tested in production, unless otherwise specified.

2. In PLL mode, the MSI accuracy is the LSE crystal accuracy.

3. Specified by design. Not tested in production.

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

5. The MSI startup time is the time when the four MSIRCs are in power down.

6. This delay is the time to switch from one MSIRC to another one. In case the destination MSIRC is in power down, the total

delay is tsu(MSI) + tswitch(MSI).

7. The MSI is in continuous mode when the internal regulator is in voltage range 1, 2 or 3.

8. The MSI is in sampling mode when MSIBIAS = 1 in RCC_ICSCR1, and the regulator is in voltage range 4, or when the

device is in Stop 1 or Stop 2 mode.

9. SMPS efficiency in range 1, based on VCORE current = 19.4 mA (CoreMark current on VCORE at 160 MHz).

Table 81. MSI oscillator characteristics(1) (continued)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

Table 82. HSI48 oscillator characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fHSI48

HSI48 frequency after factory calibration VDD = 3.0 V, TJ = 30 °C

47.5

48.5

MHz

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