STM32H747AI datasheet(144/252 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32H747xI/G

134/242

DS12930 Rev 1

64 MHz high-speed internal RC oscillator (HSI)

4 MHz low-power internal RC oscillator (CSI)

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 55. 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 56. 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)

DVDD (CSI)

CSI oscillator frequency drift over

VDD

VDD = 1.62 to 3.6 V

−

0.06

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