GD32F310 datasheet(51/81 Pages) GIGADEVICE

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GD32F310xx Datasheet

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VHXTALH(2)

OSCIN input pin high level voltage

VDD = 3.3 V

0.7 VDD

—

VDD

VHXTALL(2)

OSCIN input pin low level voltage

VSS

— 0.3 VDD

tH/L(HXTAL)(2)

OSCIN high or low time

—

tR/F(HXTAL)(2)

OSCIN rise or fall time

—

CIN(2)

OSCIN input capacitance

—

Ducy(HXTAL) (2)

Duty cycle

—

(1)

Based on characterization, not tested in production.

(2)

Guaranteed by design, not tested in production.

Table 4-16. Low speed external clock (LXTAL) generated from a crystal/ceramic

characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fLXTAL(1)

Crystal or ceramic frequency

—

32.768

—

kHz

CLXTAL(2)(3)

Recommended matching

capacitance on OSC32IN

and OSC32OUT

—

Ducy(LXTAL)(2) Crystal or ceramic duty cycle

—

gm(2)

Oscillator transconductance

Lower driving

capability

—

μA/V

Medium low driving

capability

—

Medium high driving

capability

—

Higher driving

capability

—

IDDLXTAL (1)

Crystal or ceramic operating

current

Lower driving

capability

—

0.8

—

μA

Medium low driving

capability

—

0.9

—

Medium high driving

capability

—

1.3

—

Higher driving

capability

—

1.8

—

tSULXTAL(1)(4)

Crystal or ceramic startup

time

—

0.8

—

(1)

Based on characterization, not tested in production.

(2)

Guaranteed by design, not tested in production.

(3)

CLXTAL1 = CLXTAL2 = 2*(CLOAD - CS), For CLXTAL1 and CLXTAL2, it is recommended matching capacitance on OSC32IN

and OSC32OUT. For CLOAD, it is crystal/ceramic load capacitance, provided by the crystal or ceramic

manufacturer. For CS, it is PCB and MCU pin stray capacitance.

(4)

tSULXTAL is the startup time measured from the moment it is enabled (by software) to the 32.768 kHz oscillator

stabilization flags is SET. This value varies significantly with the crystal manufacturer.

Table 4-17. Low speed external user clock characteristics (LXTAL in bypass mode)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fLXTAL_ext(1)

External clock source or oscillator VDD = 3.3 V

—

32.768 1000

kHz

GD32F310 Datasheet(PDF) 51 Page - GigaDevice Semiconductor (Beijing) Inc.

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