STM32H533CE datasheet(121/231 Pages) STMICROELECTRONICS

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DS14539 Rev 1

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STM32H533xx

Electrical characteristics

200

For CL1 and CL2, it is recommended to use high-quality external ceramic capacitors in the

5 to 20 pF range (typical), designed for high-frequency applications, and selected to match

the requirements of the crystal or resonator (see Figure 18). CL1 and CL2 usually have the

same size. The crystal manufacturer typically specifies a load capacitance, which is the

series combination of CL1 and CL2. PCB and MCU pin capacitance must be included (10 pF

can be used as a rough estimate for the combined pin and board capacitance) when sizing

CL1 and CL2.

Note:

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

microcontrollers”, available from www.st.com.

Figure 18. 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 42. 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).

1. Evaluated by design - Not tested in production.

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

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

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

ai17530b

OSC_OU T

OSC_IN

fHSE

CL1

STM32

8 MHz

resonator

Resonator with

integrated capacitors

Bias

controlled

gain

REXT(1)

CL2

Table 42. 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

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