C8051F38C-GMR View Datasheet(PDF) - Silicon Laboratories

Part Name

Description

MFG CO.

C8051F38C-GMR

Full Speed USB Flash MCU Family

Silicon Laboratories 

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

4.2. USB

Figure 4.5 shows a typical connection diagram for the USB pins of the C8051F38x devices including a

100 Ω current-limiting resistor on the VBUS sense pin and ESD protection diodes on the USB pins. 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

Connector

VBUS

D+

D-

Signal GND

Recommended,

not required

100 ȍ

VBUS

D+

D-

SP0503BAHT or

equivalent USB

ESD protection

diodes

GND

C8051F38x Device

USB

Figure 4.5. Connection Diagram for USB Pins

4.3. Voltage Reference (VREF)

Figure 4.6 shows a typical connection diagram for the voltage reference (VREF) pin of the C8051F38x

devices when using the internal voltage reference. When using an external voltage reference, consult the

appropriate device’s data sheet for connection recommendations.

C8051F38x Device

2.42 V (out)

4.7 µF and 0.1 µF

capacitors recommended

for internal voltage

reference.

VREF

Voltage

Reference

GND

Figure 4.6. Connection Diagram for Internal Voltage Reference

36

Rev. 1.4

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