CP2104EK Silicon Laboratories Inc, CP2104EK Datasheet - Page 17

• 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

Alternatively, if 3.0 to 3.6 V power is supplied to the V
device with the voltage regulator bypassed. For this configuration, tie the REGIN input to V
regulator. A typical connection diagram showing the device in a self-powered application with the regulator
bypassed is shown in Figure 9.
The USB max power and power attributes descriptor must match the device power usage and configuration. See
application note “AN144: CP21xx Device Customization Guide” for information on how to customize USB
descriptors for the CP2104.
Connector
Power
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
3.3 V
USB
VBUS
GND
D+
D-
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.
Figure 9. Typical Self-Powered Connection Diagram (Regulator Bypass)
1-5 F
Note 1
Note 3
4.7 F
0.1 F
Note 4
VDD
VIO
REGIN
GND
VBUS
D+
D-
VPP
Rev. 1.0
DD
CP2104
pin, the CP2104 can function as a USB self-powered
SUSPEND
SUSPEND
GPIO.2
GPIO.3
GPIO.0
GPIO.1
DCD
DTR
DSR
RXD
RST
TXD
RTS
CTS
RI
VIO
DD
Standard
To external circuitry for
To external circuitry for
Signals
USB suspend states
UART
Note 2
4.7 k
status and control
to bypass the voltage
CP2104
17