STM32U375CE datasheet(134/222 Pages) STMICROELECTRONICS

134 / 222 page

Symbol

Parameter

Conditions

Min

Typ

Max Unit

ΔVDD(HSI48)(1) HSI48 oscillator frequency drift with VDD(4)

3.0 V ≤ VDD ≤ 3.6 V

0.025 0.05

1.58 V ≤ VDD ≤ 3.6 V

0.05

0.1

NT jitter(1)

Next transition jitter

Accumulated jitter on 28 cycles(5)

± 0.15

PT jitter(1)

Paired transition jitter

Accumulated jitter on 56 cycles(5)

± 0.25

tsu(HSI48)(1)

HSI48 oscillator startup time

2.5

μs

IDD(HSI48)(1)

HSI48 oscillator power consumption

350

400

μA

1. Specified by design. Not tested in production.

2. Evaluated by characterization. Not tested in production.

3. ΔfHSI = ACCHSI48_REL + ΔVDD.

4. These values are obtained with one of the following formulas: (Freq(3.6 V) - Freq(3.0 V)) / Freq(3.0 V) or

(Freq(3.6 V) Freq(1.58 V)) / freq(1.58 V).

5. Jitter measurements are performed without the clock source activated in parallel.

Figure 35. HSI48 frequency versus temperature

-3

-2.5

-2

-1.5

-1

-0.5

0.5

1.5

-60

-40

-20

100

120

Temperature ( C)

Average

Min

Max

Low-speed internal (LSI) RC oscillator

Table 78. LSI oscillator characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fLSI

LSI frequency

VDD = 3.0 V, TJ = 30 °C, LSIPREDIV = 0

31.4

32.0

32.6

kHz

VDD = 3.0 V, TJ = 30 °C, LSIPREDIV = 1

0.245 0.25 0.255

1.71 V ≤ VDD ≤ 3.6, TJ = –40 to 110 °C LSIPREDIV = 0(1)

30.4

32.0

33.6

DuCy(LSI)

LSI duty cycle

LSIPREDIV = 1

tSU(LSI)(2)

LSI oscillator startup time

230

260

μs

tSTAB(LSI)(2) LSI oscillator stabilization time

5% of final frequency

230

260

IDD(LSI)(2)

LSI oscillator power consumption

LSIPREDIV = 0

140

255

LSIPREDIV = 1

130

240

STM32U375xx

Electrical characteristics

DS14861 - Rev 2

page 134/222

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