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USB232 Converter User Guide
1.1 USB-232 Features
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USB 2.0 Compliant Interface
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Supports 12 Mbps USB full-speed data rate
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Supports USB suspend, resume and remote wakeup operations
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USB Port Transient Suppressor
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Enhanced UART Features
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Data rates up to 12 Mbps
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128 byte TX FIFO
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384 byte RX FIFO
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7, 8 or 9 data bits, 1 or 2 stop bits
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Automatic Hardware (RTS/CTS or DTR/DSR) Flow Control
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Automatic Software (Xon/Xoff) Flow Control
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Sleep Mode for reduced power
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Powered directly from USB
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LEDs for Power, TX and RX
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ESD protection diodes on RS232 lines
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Software drivers
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Windows 2000, XP, Vista, and Mac
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Optional EEPROM for vendor data
1.2 Design Reference
The Exar USB-UART 1-Channel Evaluation Board was used as the reference design for the USB232
converter design.
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Exar XR21V1410IL16-QFN16 USB UART (V1410)
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Exar SP3244EEY-L-TSSOP-28 RS232 transceiver
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Exar SP6669AEK-L-TTR3-SOT23-5 Voltage regulator (or similar design)
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Inrush limiter
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DB9 with male pins wired as a DTE device.
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Interface Description
