STM32H7 datasheet(235/357 Pages) STMICROELECTRONICS

235 / 357 page

DS12110 Rev 10

235/357

STM32H742xI/G STM32H743xI/G

Electrical characteristics (rev V)

320

64 MHz high-speed internal RC oscillator (HSI)

4 MHz low-power internal RC oscillator (CSI)

∆fHSI = ACCHSI48_REL + ∆VDD.

5. These values are obtained by using the formula: (Freq(3.6V) - Freq(3.0V)) / Freq(3.0V) or (Freq(3.6V) - Freq(1.62V)) /

Freq(1.62V).

6. Jitter measurements are performed without clock source activated in parallel.

Table 144. HSI oscillator characteristics(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fHSI

HSI frequency

VDD=3.3 V, TJ=30 °C

63.7(2)

64.3(2)

MHz

TRIM

HSI user trimming step

Trimming is not a multiple

of 32

0.24

0.32

Trimming is 128, 256 and

384

−5.2

−1.8

Trimming is 64, 192, 320

and 448

−1.4

−0.8

Other trimming are a

multiple of 32 (not

including multiple of 64

and 128)

−0.6

−0.25

DuCy(HSI) Duty Cycle

ΔVDD (HSI)

HSI oscillator frequency drift over

VDD (reference is 3.3 V)

VDD=1.62 to 3.6 V

−0.12

0.03

ΔTEMP (HSI)

HSI oscillator frequency drift over

temperature (reference is 64 MHz)

TJ=-20 to 105 °C

−1(3)

-1(3)

TJ=−40 to TJmax °C

−2(3)

-1(3)

tsu(HSI)

HSI oscillator start-up time

1.4

µs

tstab(HSI)

HSI oscillator stabilization time

at 1% of target frequency

µs

IDD(HSI)

HSI oscillator power consumption

300

400

µA

1. Guaranteed by design unless otherwise specified.

2. Guaranteed by test in production.

3. Guaranteed by characterization.

Table 145. CSI oscillator characteristics(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fCSI

CSI frequency

VDD=3.3 V, TJ=30 °C

3.96(2)

44.04(2)

MHz

TRIM

Trimming step

0.35

DuCy(CSI)

Duty Cycle

∆TEMP (CSI)

CSI oscillator frequency drift over

temperature

TJ = 0 to 85 °C

−3.7(3)

4.5(3)

TJ = −40 to 125 °C

−11(3)

7.5(3)

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