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GD32F310 数据表(PDF) 51 Page - GigaDevice Semiconductor (Beijing) Inc. |
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GD32F310 数据表(HTML) 51 Page - GigaDevice Semiconductor (Beijing) Inc. |
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51 / 81 page  GD32F310xx Datasheet 50 Symbol Parameter Conditions Min Typ Max Unit VHXTALH(2) OSCIN input pin high level voltage VDD = 3.3 V 0.7 VDD — VDD V VHXTALL(2) OSCIN input pin low level voltage VSS — 0.3 VDD tH/L(HXTAL)(2) OSCIN high or low time — 5 — — ns tR/F(HXTAL)(2) OSCIN rise or fall time — — — 10 CIN(2) OSCIN input capacitance — — 5 — pF Ducy(HXTAL) (2) Duty cycle — 30 50 70 % (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 — — 15 — pF Ducy(LXTAL)(2) Crystal or ceramic duty cycle — 30 — 70 % gm(2) Oscillator transconductance Lower driving capability — 4 — μA/V Medium low driving capability — 6 — Medium high driving capability — 12 — Higher driving capability — 18 — 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 — s (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 |
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