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Transceiver goes online upon RS-232 connection

Posted: 28 Dec 2012     Print Version  Bookmark and Share

Keywords:receiver  transceiver  RS-232 

Exar Corp. debuts the SP3221E low power, single driver/single receiver transceiver solution. The device has an auto online feature to automatically "wake-up" from a shutdown state when an RS-232 cable is connected and a peripheral device is turned on.

When it is not in use or not connected, the device shuts down, drawing less than 1�A of supply current. This makes it suited for portable or battery powered applications such as data logging and acquisition devices, remote sensors, medical diagnostics, and other embedded systems.

The SP3221E uses an internal high-efficiency, charge-pump power supply that requires only four external 0.1�A capacitors. The charge pump and Exar's driver architecture allow the SP3221E to deliver compliant RS-232 performance from one power supply ranging from +3.0V to +5.5V.

The SP3221E is a 1-driver/1-receiver RS-232 transceiver with a 250kbps data rate. The device complies with the EIA/TIA-232-F standards when powered from a +3.0V to +5.5V power supply, and with the EIA/TIA-562 down to a +2.7V power source.

The SP3221E is available immediately in volume quantities and comes in a 16-pin TSSOP package. The 1,000-unit suggested retail price is $0.70 each.

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