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FT93x Datasheet Embedded Microcontroller Datasheet

Version 1.5

Document Reference No.: BRT_000051

Clearance No.: BRT#049

4.21

Power Management

4.21.1 Power Supply

The FT93x series may be operated with a single supply of +3.3V applied to VCCIO3V3, VUSB3V3, and

VCC3V3A pins. The +1.2V internal regulator provides power to the core circuit after VCCIO3V3 power is

applied and the system will generate a Power on Reset (POR) pulse when the output voltage rises above

the POR threshold.

4.21.2 Power down Mode

Power down mode applies to the entire system. In the power down mode, the system 12MHz oscillator

and PLL both switch off and the system clock to the core and all peripherals stop except for the RTC

oscillator and internal regulator. The internal regulator retains power for the core and RTC operation.

An interrupt from GPIO or wake-up events from the USB2.0 Device controller can wake-up the system

from the power down mode independently.

If the USB2.0 Device controller was used and the respective interrupt bit was also enabled before the

system entered into power down mode, then the following events can wake-up the system.



USB2.0 Device controller detects connects interrupt.



USB2.0 Device controller detects disconnects interrupt.



USB Host issue reset signal to the USB2.0 Device controller.



USB Host issue resume signal to the USB2.0 Device controller.

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