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FS32K142BHTXVLLTR 数据表(PDF) 38 Page - NXP Semiconductors |
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FS32K142BHTXVLLTR 数据表(HTML) 38 Page - NXP Semiconductors |
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38 / 100 page  Table 27. External System Oscillator electrical specifications (continued) Symbol Description Min. Typ. Max. Unit Notes High-gain mode (HGO=1) — 1 — MΩ RS3 Series resistor Low-gain mode (HGO=0) — 0 — kΩ High-gain mode (HGO=1) — 0 — kΩ Vpp_XTAL Peak-to-peak amplitude of oscillation (oscillator mode) at XTAL 4 Low-gain mode (HGO=0) — 1.0 — V High-gain mode (HGO=1) — 3.3 — V Vpp_EXTAL Peak-to-peak amplitude of oscillation (oscillator mode) at EXTAL 4 Low-gain mode (HGO=0) 0.8 — — V High-gain mode (HGO=1), VDD= 4.0 V to 5.5 V 1.7 — — V VSOSCOP Oscillation operating point 4 High-gain mode (HGO=1) 1.15 — — V 1. Crystal oscillator circuit provides stable oscillations when gmXOSC > 5 * gm_crit. The gm_crit is defined as: gm_crit = 4 * (ESR + RS) * (2πF)2 * (C0 + CL)2 where: • gmXOSC is the transconductance of the internal oscillator circuit • ESR is the equivalent series resistance of the external crystal • RS is the series resistance connected between XTAL pin and external crystal for current limitation • F is the external crystal oscillation frequency • C0 is the shunt capacitance of the external crystal • CL is the external crystal total load capacitance. CL = Cs+ [C1*C2/(C1+C2)] • Cs is stray or parasitic capacitance on the pin due to any PCB traces • C1, C2 external load capacitances on EXTAL and XTAL pins See manufacture datasheet for external crystal component values 2. • When low-gain is selected, internal RF will be selected and external RF should not be attached. • When high-gain is selected, external RF (1 M Ohm) needs to be connected for proper operation of the crystal. For external resistor, up to 5% tolerance is allowed. 3. RS should be selected carefully to have appropriate oscillation amplitude for both protecting crystal or resonator device and satisfying proper oscillation startup condition. 4. The EXTAL and XTAL pins should only be connected to required oscillator components and must not be connected to any other devices. 6.2.2 External System Oscillator frequency specifications Clock interface modules S32K1xx Data Sheet, Rev. 12, 02/2020 38 NXP Semiconductors |
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