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Mio336i PDA Maintenance
Mio336i PDA Maintenance
1.3.2.7 UART Transceiver : SIPEX SP3243E
The SP3223E and 3243E products are RS-232 transceiver solutions intended for portable of hand-held applications
such as notebook and palmtop computers. The SP3223E and 3243E use an internal high-efficiency, charge-pump
power supply that requires only 0.1mF capacitors in 3.3V operation. This charge pump and Sipex’s driver
architecture allow the SP3223E/3243E series to deliver compliant RS-232 performance from a single power supply
ranging from +3.3V to +5.0V. The SP3223E is a 2-driver/2-receiver, and the SP3243E is a 3-driver/5-receiver
device ideal for laptop/notebook computer and PDA applications.
The SP3243E includes one complementary receiver that remains alert to monitor an external device’s Ring Indicate
signal while the device is shutdown. The Auto-Online feature allows the device to automatically “wake-up” during
a shutdown state when an RS-232 cable is connected and a connected peripheral is turned on. Otherwise, the device
automatically shuts itself down drawing less than 1mA.
Description
Meets true EIA/TIA-232-F standards from a +3.0V to +5.5V power supply
Interoperable with EIA/TIA-232 and adheres to EIA/TIA-562 down to a +2.7V power source
Auto-Online circuitry automatically wakes up from a 1mA shutdown
Minimum 120Kbps data rate under load
Regulated charge pump yields stable RS-232 outputs regardless of Vcc variations
Features :
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