STM32H523CEU6 datasheet(118/228 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32H523xx

118/228

DS14540 Rev 1

Low-speed external clock generated from a crystal resonator

The low-speed external (LSE) clock can be supplied with a 32.768 kHz crystal resonator

oscillator. All the information given in this paragraph is based on design simulation results

obtained with typical external components specified in Table 41. In the application, the

resonator and the load capacitors must be placed as close as possible to the oscillator pins

to minimize output distortion and startup stabilization time. Refer to the crystal resonator

manufacturer for more details on the resonator characteristics (frequency, package,

accuracy).

Note:

For information on selecting the crystal, refer to AN2867 “Oscillator design guide for ST

microcontrollers”, available from www.st.com.

Figure 19. Typical application with a 32.768 kHz crystal

Table 41. Low-speed external user clock characteristics(1)

Symbol

Parameter

Conditions(2)

Min

Typ

Max

Unit

Oscillator frequency

32.768

kHz

IDD

LSE current consumption

LSEDRV[1:0] = 01

Medium low drive capability

-333

LSEDRV[1:0] = 10

Medium high drive capability

-462

LSEDRV[1:0] = 11

High drive capability

-747

Gmcritmax

Maximum critical crystal

LSEDRV[1:0] = 01

Medium low drive capability

0.75

µA/V

LSEDRV[1:0] = 10

Medium high drive capability

1.7

LSEDRV[1:0] = 11

High drive capability

2.7

tSU(LSE)(3) Startup time

VDD is stabilized

1. Specified by design - Not tested in production.

2. Refer to the note and caution paragraphs below the table, and to AN2867 “Oscillator design guide for ST

microcontrollers”.

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

32.768 kHz oscillation is reached. This value is measured for a standard crystal and can vary significantly

with the crystal manufacturer

ai17531d

STM32

OSC32_OUT

fLSE

CL1

32.768 kHz

resonator

Bias

controlled

gain

OSC32_IN

CL2

Resonator with

integrated

capacitors

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