STM32MP151AAA3T datasheet(147/245 Pages) STMICROELECTRONICS

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DS12500 Rev 1

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STM32MP151A

Electrical characteristics

228

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

5 pF to 25 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 are usually

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

series combination of CL1 and CL2. The PCB and MCU pin capacitance must be included

(10 pF can be used as a rough estimate of the combined pin and board capacitance) when

sizing CL1 and CL2.

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 18. Typical application with a 24 MHz crystal

1. REXT value depends on the crystal characteristics.

IDD(HSE)

HSE current consumption

During startup(3)

VDD = 3 V, Rm = 150 Ω

CL = 12 pF at 4 MHz

-0.35

VDD = 3 V, Rm = 120 Ω

CL = 12 pF at 16 MHz

-0.40

VDD = 3 V, Rm = 100 Ω

CL = 10 pF at 24 MHz

-0.45

VDD = 3 V, Rm = 80 Ω

CL = 8 pF at 32 MHz

-0.65

VDD = 3 V, Rm = 80 Ω

CL = 8 pF at 48 MHz

-0.95

Gmcritmax

Maximum critical crystal gm

Startup

1.5

mA/V

tSU(4)

Start-up time

VDD is stabilized

1. Guaranteed by design.

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.

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

Symbol

Parameter

Operating conditions(2)

Min

Typ

Max

Unit

ai17530b

OSC_OU T

OSC_IN

fHSE

CL1

STM32

8 MHz

resonator

Resonator with

integrated capacitors

Bias

controlled

gain

REXT(1)

CL2

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