C8051F38B-GMR View Datasheet(PDF) - Silicon Laboratories

Part Name

Description

Manufacturer

C8051F38B-GMR

Full Speed USB Flash MCU Family

Silicon Laboratories 

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

4. Typical Connection Diagrams

This section provides typical connection diagrams for C8051F38x devices.

4.1. Power

Figure 4.1 shows a typical connection diagram for the power pins of the C8051F38x devices when the

internal regulator is in use and USB is not used.

3.6-5.25 V (in)

1 µF and 0.1 µF bypass

capacitors required for

each power pin placed

as close to the pins as

possible.

3.3 V (out)

REGIN

C8051F38x Device

Voltage

Regulator

VDD

VBUS

GND

Figure 4.1. Connection Diagram with Voltage Regulator Used and No USB

Figure 4.2 shows a typical connection diagram for the power pins of the C8051F38x devices when the

internal regulator and USB are not used.

1 µF and 0.1 µF bypass

capacitors required for

each power pin placed

as close to the pins as

possible.

2.7-3.6 V (in)

REGIN

VDD

VBUS

C8051F38x Device

Voltage

Regulator

GND

Figure 4.2. Connection Diagram with Voltage Regulator Not Used and No USB

Figure 4.3 shows a typical connection diagram for the power pins of the C8051F38x devices when the

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

34

Rev. 1.4

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