STM32MP151AAA3 datasheet(146/245 Pages) STMICROELECTRONICS

146 / 245 page

Electrical characteristics

STM32MP151A

146/245

DS12500 Rev 1

Note:

For information on selecting the crystal, refer to the application note AN2867 “Oscillator

design guide for ST microcontrollers” available from the ST website www.st.com.

Figure 17. Low-speed external clock source AC timing diagram

High-speed external clock generated from a crystal/ceramic resonator

The high-speed external (HSE) clock can be supplied with a 8 to 48 MHz crystal/ceramic

resonator oscillator. All the information given in this paragraph are based on

characterization results obtained with typical external components specified in Table 31. In

the application, the resonator and the load capacitors have to be placed as close as

possible to the oscillator pins in order to minimize output distortion and startup stabilization

time. Refer to the crystal resonator manufacturer for more details on the resonator

characteristics (frequency, package, accuracy).

Table 30. Low-speed external user clock characteristics(1)

Symbol

Parameter

Min

Typ

Max

Unit

fLSE_ext

User external clock source frequency

32.768

1000

kHz

VLSEH

OSC32_IN input pin high level voltage

0.7×VDD

-VDD

VLSEL

OSC32_IN input pin low level voltage

VSS

-0.3 VDD

tw(LSEH)

tw(LSEL)

OSC32_IN high or low time

250

1. Guaranteed by design.

ai17529b

OSC32_IN

External

STM32

clock source

VLSEH

tf(LSE)

tW(LSE)

90%

10 %

TLSE

tr(LSE)

tW(LSE)

fLSE_ext

VLSEL

Table 31. 8-48 MHz HSE oscillator characteristics(1)

Symbol

Parameter

Operating conditions(2)

Min

Typ

Max

Unit

Oscillator frequency

MHz

Feedback resistor

200

kΩ

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