User's Manual

31 March 2017
5 of 13
RED4 User’s Manuals - Preliminary Version
2 Operation Method
Figure 2 Application Circuit
2.1 Power Supply
DC power to operate RED4 is separated by 2 kinds. VCC36 is to supply for PR9200 which power range is 3.3
to 3.6 volts, VCC36P is to supply for power amp which power range is 3.3 to 4.2 volts. Total current consumption
of RED4 is typically 450mA at 25dBm output power.
2.2 UART
The serial interface is assigned with two wires. RXD0, which pin is assigned to pin 35, is for receiving command
from host and TXD0, which pin is assigned to pin 34, is for transmitting response to host. Pin connection is
shown as below figure.
Host MCU
TXDx
RXDx
GND
TXD
RXD
GND
REDx
Figure 3 Host MCU Connection
Following configuration is used for interfacing to USB transceiver.
USB Tranceiver
TXDx
RXDx
GND
RXOUT
TXIN
GND
D+
VBUS
GND
USB
D-
D+
VBUS
GND
D-
REDx
Figure 4 USB transceiver Connection
2.3 RF In/Out
RF I/O which assigned to Pin 18 is optimized with 50ohm impedance.