STM32MP157C datasheet(151/258 Pages) STMICROELECTRONICS

151 / 258 page

DS12505 Rev 2

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STM32MP157C

Electrical characteristics

238

Figure 18. 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 33. 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).

ai17529b

OSC32_IN

External

STM32

clock source

VLSEH

tf(LSE)

tW(LSE)

90%

10 %

TLSE

tr(LSE)

tW(LSE)

fLSE_ext

VLSEL

Table 33. 8-48 MHz HSE oscillator characteristics(1)

Symbol

Parameter

Operating conditions(2)

Min

Typ

Max

Unit

Oscillator frequency

MHz

Feedback resistor

200

kΩ

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.

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