CP2104EK Silicon Laboratories Inc, CP2104EK Datasheet - Page 16

• Manufacturer Part Number: CP2104EK
• Description: KIT EVAL FOR CP2104
• Manufacturer: Silicon Laboratories Inc

Specifications of CP2104EK

• Main Purpose: Interface, USB 2.0 to UART (RS485) Bridge
• Embedded: No
• Utilized Ic / Part: CP2104
• Primary Attributes: Full Speed (12Mbps)
• Secondary Attributes: LED Status Indicators
• Interface Type: RS-232, USB
• Operating Supply Voltage: 3.3 V
• Product: Interface Development Tools
• For Use With/related Products: CP2104
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 336-2007

CP2104
9. Voltage Regulator
The CP2104 includes an on-chip 5.0 to 3.45 V voltage regulator. This allows the CP2104 to be configured as either
a USB bus-powered device or a USB self-powered device. A typical connection diagram of the device in a bus-
powered application using the regulator is shown in Figure 8. When enabled, the voltage regulator output appears
on the V
characteristics. If the regulator is used to provide V
from Figure 8, but connect REGIN to an onboard 5 V supply, and disconnect it from the VBUS pin
i
16
Connector
Note 1 : Avalanche transient voltage suppression diodes compatible with Full-speed USB should be
Note 2 : An external pull-up is not required, but can be added for noise immunity.
Note 3 : VIO can be connected directly to VDD or to a supply as low as 1.8 V to set the I/O interface
Note 4 : If configuration ROM is to be programmed via USB, a 4.7 F capacitor must be added
USB
VBUS
GND
D+
DD
D-
3.45 V Power
pin and can be used to power external devices. See Table 5 for the voltage regulator electrical
added at the connector for ESD protection. Use Littelfuse p/n SP0503BAHT or equivalent.
voltage.
between VPP and ground. During a programming operation, the pin should not be
connected to other circuitry, and VDD must be at least 3.3 V.
1-5 F
Note 1
Figure 8. Typical Bus-Powered Connection Diagram
Note 3
4.7 F
0.1 F
1 F
Note 4
VDD
VIO
GND
VBUS
D+
D-
VPP
REGIN
DD
Rev. 1.0
in a self-powered application, use the same connections
CP2104
SUSPEND
SUSPEND
GPIO.0
GPIO.1
GPIO.2
GPIO.3
DCD
DSR
RXD
DTR
RST
TXD
RTS
CTS
RI
VIO
Standard
To external circuitry for
To external circuitry for
Signals
USB suspend states
UART
Note 2
4.7 k
status and control