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CP2105

SINGLE-CHIP USB TO UART BRIDGE

Silicon Laboratories 

CP2105

8.2. GPIO.1_ECI—RS-485 Transceiver Bus Control

GPIO.1_ECI is configurable as an RS-485 bus transceiver control pin or the Enhanced Communication Interface

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 and the RX Toggle mode is not

available. The RS-485 mode of GPIO.1_ECI is active-high by default, and is also configurable for active-low mode.

CP2105

RS-485

Transceiver

TX

R

RX

D

GPIO.1_ECI – RS485

RE

DE

Figure 6. RS-485 Transceiver Typical Connection Diagram

Rev. 1.0

15

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