C8051F38C-GMR 查看數據表（PDF） - Silicon Laboratories

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C8051F38C-GMR

Full Speed USB Flash MCU Family

Silicon Laboratories 

C8051F380/1/2/3/4/5/6/7/C

USB is connected to a host device and is shown with a 100 Ω current-limiting resistor. This current-limiting

resistor is recommended for systems that may experience electrostatic discharge (ESD), latch-up, and

have a greater opportunity to share signals with systems that do not have the same ground potential. This

is not a required component for most applications.

USB 5 V (in)

1 μF and 0.1 μF bypass

capacitors required for

each power pin placed

as close to the pins as

possible.

Recommended,

not required

100 ȍ

3.3 V (out)

VBUS

REGIN

VDD

C8051F38x Device

Voltage

Regulator

GND

Figure 4.3. Connection Diagram with Voltage Regulator Used and USB Connected

(Bus-Powered)

Figure 4.4 shows a typical connection diagram for the power pins of the C8051F38x devices when the

internal regulator used and USB is connected (self-powered). The VBUS signal is used to detect when

USB is connected to a host device and is shown with a 100 Ω current-limiting resistor. This current-limiting

resistor is recommended for systems that may experience electrostatic discharge (ESD), latch-up, and

have a greater opportunity to share signals with systems that do not have the same ground potential. This

is not a required component for most applications.

1 μF and 0.1 μF bypass

capacitors required for

each power pin placed

as close to the pins as

possible.

USB 5 V

(sense)

3.6-5.25 V (in)

Recommended,

not required

100 ȍ

VBUS

3.3 V (out)

REGIN

VDD

C8051F38x Device

Voltage

Regulator

GND

Figure 4.4. Connection Diagram with Voltage Regulator Used and USB Connected

(Self-Powered)

Rev. 1.4

35

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