User's Manual

Applications
• IEEE 802.15.4 radios
• Advanced metering infrastructure
• ISM systems
Figure 2. SKY65348(U13) Block Diagram
3. RS-232C Transceiver Chip(U15)
The SP3232E(U15) is an RS-232 transceiver solution intended for portable or handheld
applications such as notebook or palmtop computers.
The SP3232E(U15) series has a high-efficiency, charge-pump power supply that requires only
0.1μF capacitors in 3.3V operation.
This charge pump allows the SP3232E to deliver true RS-232 performance from a single power
supply ranging from +3.3V to +5.0V.
The SP3232E is 2-driver/2-receiver devices.
Figure 3. SP3232(U15) Block Diagram