GD32H757ZMT7 datasheet(98/151 Pages) GIGADEVICE

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GD32H757xx Datasheet

characteristics(5)

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

—

DutyLXTAL(2)

Crystal or ceramic duty

cycle

—

gm(2)

Oscillator transconductance

LXTALDRI[1:0] = 00

—

4.88

—

μA/V

LXTALDRI[1:0] = 01

—

7.32

—

LXTALDRI[1:0] = 10

—

14.61

—

LXTALDRI[1:0] = 11

—

21.94

—

IDD(LXTAL)(1)

Crystal or ceramic operating

current

LXTALDRI[1:0] = 00

—

480

—

LXTALDRI[1:0] = 01

—

590

—

LXTALDRI[1:0] = 10

—

900

—

LXTALDRI[1:0] = 11

—

1210

—

tST(LXTAL)(1)(4)

Crystal or ceramic startup

time

LXTALDRI[1:0] = 00

—

453.9

—

LXTALDRI[1:0] = 01

—

322.7

—

LXTALDRI[1:0] = 10

—

220.4

—

LXTALDRI[1:0] = 11

—

192.4

—

(1)

Value guaranteed by characterization, not 100% tested in production.

(2)

Value guaranteed by design, not 100% 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)

tST(LXTAL) 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.

(5)

More details about gm could be found in AN052 GD32 MCU Resonator-Based Clock Circuits.

Table 4-18. 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

frequency

VDD = 3.3 V

—

32.768 1000 kHz

VLXTALH(2)

OSC32IN input pin high level voltage

—

0.7

VDD

—

VDD

VLXTALL(2)

OSC32IN input pin low level voltage

—

VSS

—

0.3 VDD

tH/L(LXTAL) (2)

OSC32IN high or low time

—

450

—

tR/F(LXTAL) (2)

OSC32IN rise or fall time

—

DutyLXTAL

Duty cycle

—

(1)

Value guaranteed by characterization, not 100% tested in production.

(2)

Value guaranteed by design, not 100% tested in production.

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