STM32G0 datasheet(71/135 Pages) STMICROELECTRONICS

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DS12232 Rev 4

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STM32G071x8/xB

Electrical characteristics

107

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 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. 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.

IDD(HSE)

HSE current consumption

During startup(3)

5.5

VDD = 3 V,

Rm = 30 Ω,

CL = 10 pF@8 MHz

-0.44

VDD = 3 V,

Rm = 45 Ω,

CL = 10 pF@8 MHz

-0.45

VDD = 3 V,

Rm = 30 Ω,

CL = 5 pF@48 MHz

-0.68

VDD = 3 V,

Rm = 30 Ω,

CL = 10 pF@48 MHz

-0.94

VDD = 3 V,

Rm = 30 Ω,

CL = 20 pF@48 MHz

-1.77

Maximum critical crystal

transconductance

Startup

1.5

mA/V

tSU(HSE)(4) Startup 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 39. HSE oscillator characteristics(1) (continued)

Symbol

Parameter

Conditions(2)

Min

Typ

Max

Unit

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