STM32MP151C datasheet(148/253 Pages) STMICROELECTRONICS

148 / 253 page

Electrical characteristics

STM32MP151C/F

148/253

DS12501 Rev 3

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 20. Typical application with a 32.768 kHz crystal

1. Adding an external resistor between OSC32_IN and OSC32_OUT is forbidden.

Table 33. Low-speed external user clock characteristics(1)

Symbol

Parameter

Operating conditions(2)

Min

Typ

Max

Unit

Oscillator frequency

32.768

kHz

IDD

LSE current

consumption

LSEDRV[1:0] = 00,

Low drive capability

-290

LSEDRV[1:0] = 01,

Medium Low drive capability

-390

LSEDRV[1:0] = 10,

Medium high drive capability

-550

LSEDRV[1:0] = 11,

High drive capability

-900

Gmcritmax

Maximum critical crystal

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

tSU(3)

Startup time

VDD is stabilized

1. Guaranteed by design.

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

ST microcontrollers.

3. tSU is the startup time measured from the moment it is enabled (by software) to a stabilized 32.768 k Hz oscillation is

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

ai17531c

STM32

OSC32_OUT

fHSE

CL1

32.768 kHz

resonator

Bias

controlled

gain

OSC32_IN

CL2

Resonator with

integrated capacitors

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