Recently, Exar (Nasdaq: EXAR) added another masterpiece to its single-chip RS-232/RS-485/RS-422 multi-protocol serial transceiver family - SP338 . This new product complements Exar 's existing line of serial transceivers and further extends Exar 's leadership in the single-chip, multi-protocol transceiver market. The SP338 is ideal for industrial or embedded PCs that require a multi-protocol serial interface. The RS-232 mode has three drivers and five receivers to meet the eight signal channels required by DB9 (3TX/5RX). The RS-485/422 mode includes half-duplex, full-duplex, and hybrid duplex configurations with up to two drivers and four receivers (2TX/4RX).
"The newly released SP338 and the recently released SP339 solve the most difficult design problem when sharing a single connector between multiple serial protocols, enabling and disabling termination resistors when converting protocols." EXAR Interface Product Line Technology Marketing Manager, Jack Roan said: "These two products have enabled our customers to reduce the number of external connectors used in the product, reduce the number of components, and reduce product cost and size. "
The SP338 integrates termination resistors and control switches that allow the system processor to enable or disable termination resistors on a single pin. The RS-485/422 mode includes open-circuit, short-circuit, and EXAR-enhanced receiver fail-safe features that use terminating resistors but the bus is idle, eliminating the need for external resistor biasing networks and switching components.
When a connector is shared between the RS-232 and RS-485/422 protocols, the RS-485 terminal and the bias resistor must be disconnected for RS-232 to communicate properly. Due to the wide range of common-mode voltages (-7V to +12 V) in the RS-485 specification, large and expensive relays must be used in RS-485 networks to enable the connection or disconnection of resistors in the circuit. Most designers will have a separate external connector for each protocol, or manually switch resistors to connect/disconnect, and the extra size and cost will follow.
In addition to the internal integrated switchable termination resistors, the SP338 features eight configurable modes including diagnostic loopback, RS-232 (3TX/5RX), half-duplex RS-485 and full-duplex RS-485/422 modes, as well as Hybrid duplex mode with 2 drivers and 4 receivers (2TX/4RX). The maximum transmission rate is 20Mbps and 1Mbps (for RS-485/422 and RS-232 respectively), and it can switch to a single control pin in any mode, and the slew rate is 256kbps. The internal integrated charge pump uses only four external capacitors to generate the bipolar voltage levels required for RS-232 from a single 3.3V or 5V supply, eliminating the need for any inductors or magnetic components.
All bus pins have ESD protection levels up to ±15kV (Human Body Mode) and ±8kV IEC 61000-4-2 contact discharge.
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