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F2837x是需要加外部的1.2V电源，内部不支持。
5.8.1 Power Sequencing
An external power supply must be used to supply 3.3 V to VDDIO, VDD3VFL, VDDOSC, and VDDA and to
provide 1.2 V to VDD. The internal VREG is not supported; therefore, the VREGENZ pin must be tied high
to 3.3 V. The supplies should ramp to full rail within 10 ms. Table 5-3 shows the supply ramp rate.
