STM32F383RC datasheet(72/125 Pages) STMICROELECTRONICS

72 / 125 page

Electrical characteristics

STM32F383xx

72/125

DocID023367 Rev 2

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

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

the requirements of the crystal or resonator (see Figure 14). 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. 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 electing the crystal, refer to the application note AN2867 “Oscillator

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

Table 37. HSE oscillator characteristics

Symbol

Parameter

Conditions(1)

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

Min(2)

Typ Max(2)

2. Guaranteed by design, not tested in production.

Unit

fOSC_IN

Oscillator frequency

MHz

Feedback resistor

200

IDD

HSE current consumption

During startup(3)

3. This consumption level occurs during the first 2/3 of the

tSU(HSE) startup time

8.5

VDD = 1.8 V, Rm= 30 Ω,

CL= 10 pF@8 MHz

-0.4

VDD = 1.8 V, Rm= 45 Ω,

CL= 10 pF@8 MHz

-0.5

VDD = 1.8 V, Rm= 30 Ω,

CL=5 pF@32 MHz

-0.8

VDD = 1.8 V, Rm= 30 Ω,

CL= 10 pF@32 MHz

-1

VDD = 1.8 V, Rm= 30 Ω,

CL= 20 pF@32 MHz

-1.5

Oscillator transconductance

Startup

mA/V

tSU(HSE)(4)

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

Startup time

VDD is stabilized

STM32F383RC Datasheet(PDF) 72 Page - STMicroelectronics

STM32F383RC Datasheet(HTML) 72 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL