STM32U595AI datasheet(245/377 Pages) STMICROELECTRONICS

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DS13633 Rev 1

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STM32U59xxx

Electrical characteristics

343

Note:

For information on selecting the crystal, refer to the application note ‘Oscillator design guide

for STM8AF/AL/S, STM32 MCUs and MPUs’ (AN2867).

Figure 32. Typical application with a 32.768 kHz crystal

Note:

An external resistor is not required between OSC32_IN and OSC32_OUT and it is forbidden

to add one.

5.3.8

Internal clock timing characteristics

The parameters given in the table below are derived from tests performed under ambient

temperature and supply voltage conditions summarized in Table 32. The provided curves

are characterization results, not tested in production.

Table 71. LSE oscillator characteristics (fLSE = 32.768 kHz)(1)

Symbol

Parameter

Conditions(2)

Min

Typ

Max

Unit

IDD(LSE)

LSE current

consumption

LSEDRV[1:0] = 00, low-drive capability

410

LSEDRV[1:0] = 01, medium low-drive capability

450

LSEDRV[1:0] = 10, medium high-drive capability

590

LSEDRV[1:0] = 11, high-drive capability

700

Gmcritmax

Maximum critical

crystal Gm

LSEDRV[1:0] = 00, low-drive capability

0.5

µA/V

LSEDRV[1:0] = 01, medium low-drive capability

0.75

LSEDRV[1:0] = 10, medium high-drive capability

1.7

LSEDRV[1:0] = 11, high-drive capability

2.7

CS_PARA

Internal stray

parasitic

capacitance(3)

tSU(LSE)(4) Startup time

VDD is stabilized

1. Specified by design. Not tested in production.

2. Refer to the note below this table.

3. CS_PARA is the equivalent capacitance seen by the crystal due to OSC32_IN and OSC32_OUT internal parasitic

capacitances.

tSU(LSE) is the startup time measured from the moment it is enabled (by software) to a stabilized 32.768 kHz oscillation is

reached. This value is measured for a standard crystal and it can vary significantly with the crystal manufacturer

MSv70418V1

OSC32_IN

OSC32_OUT

Drive

programmable

amplifier

fLSE

32.768 kHz resonator

Resonator with integrated capacitors

CL1

CL2

Note:

CL1 and CL2 are external load capacitances. Cs (stray capacitance) is the sum of the device OSC32_IN/OSC32_OUT pins

equivalent parasitic capacitance (CS_PARA), and the PCB parasitic capacitance.

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