CP2104EK Silicon Laboratories Inc, CP2104EK Datasheet - Page 13

• 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

7.1. GPIO.0-1—Transmit and Receive Toggle
GPIO.0 and GPIO.1 are configurable as Transmit Toggle and Receive Toggle pins. These pins are logic high when
a device is not transmitting or receiving data, and they toggle at a fixed rate as specified in Table 6 when data
transfer is in progress. Typically, these pins are connected to two LEDs to indicate data transfer.
7.2. GPIO.2—RS-485 Transceiver Bus Control
GPIO.2 is configurable as an RS-485 bus transceiver control pin which is connected to the DE and RE inputs of the
transceiver. When configured for RS-485 mode, the pin is asserted during UART data transmission as well as line
break transmission. The RS-485 mode of GPIO.2 is active-high by default, and is also configurable for active-low
mode.
Figure 5. Transmit and Receive Toggle Typical Connection Diagram
GPIO.2 – RS485
CP2104
Figure 6. RS-485 Transceiver Typical Connection Diagram
GPIO.1 – RX Toggle
GPIO.0 – TX Toggle
RX
TX
CP2104
Rev. 1.0
VIO
R
D
RE
DE
Transceiver
RS-485
CP2104
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