STM32H562II datasheet(150/270 Pages) STMICROELECTRONICS

150 / 270 page

Electrical characteristics

STM32H562xx and STM32H563xx

150/270

DS14258 Rev 5

Note:

For information on selecting the crystal, refer to AN2867 “Guidelines for oscillator design on

STM8AF/AL/S and STM32 MCUs/MPUs”, available from www.st.com.

Figure 29. Typical application with an 8 MHz crystal

1. REXT value depends on the crystal characteristics.

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 43. 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

Table 42. 4-50 MHz HSE oscillator characteristics(1)

1. Evaluated by design - Not tested in production.

Symbol

Parameter

Operating conditions(2)

2. Resonator characteristics given by the crystal/ceramic resonator manufacturer.

Min

Typ

Max

Unit

Oscillator frequency

MHz

Feedback resistor

200

kΩ

IDD(HSE) HSE current consumption

During startup(3)

3. This consumption level occurs during the first 2/3 of the tSU(HSE) startup time

VDD = 3 V, Rm = 20 Ω,

CL = 10 pF at 4 MHz

-0.44

VDD = 3 V, Rm = 20 Ω,

CL = 10 pF at 8 MHz

-0.44

VDD = 3 V, Rm = 20 Ω,

CL = 10 pF at 16 MHz

-0.55

VDD = 3 V, Rm = 20 Ω,

CL = 10 pF at 32 MHz

-0.67

VDD = 3 V, Rm = 20 Ω,

CL = 10 pF at 48 MHz

-1.17

Gmcritmax Maximum critical crystal gm

Startup

1.5

mA/V

tSU(HSE)(4)

4. tSU(HSE) is the startup time measured from the moment it is enabled (by software) to a stabilized 8 MHz

oscillation is reached. This value is measured for a standard crystal resonator and it can vary significantly

with the crystal manufacturer

Startup time

VDD is stabilized

ai17530b

OSC_OU T

OSC_IN

fHSE

CL1

STM32

8 MHz

resonator

Resonator with

integrated capacitors

Bias

controlled

gain

REXT(1)

CL2

STM32H562II Datasheet(PDF) 150 Page - STMicroelectronics

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