CMX867A Low Power V.22 Modem

  
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This RS-232 RS-232 /a> to RS-485 protocol converter uses two products for a complete operational system. The circuit will comply with all EIA and ITU specifications for RS-232 RS-232 /a> to RS-485 RS422 conversion. This is a rugged design that will handle +/-15kV ESD levels on the bus pins. The design is compatible with 3. 3V or 5V systems requirin
CMX867A Low Power V.22 Modem - schematic

g only one pin compatible device change. Only six external capacitors are required, giving the design a small footprint. The RS-232 >SP3220 has receiver enable control (/EN) and driver shutdown control (/SHUTDOWN) if power saving is required. (Schematic figure 1) The SP3070/6 (14 pin package) CAN be substituted for the SP3071/7 to also shutdown the RS-485 transceiver. This provides power savings and extended battery life for low power systems. (Schematic figure 2) /SHUTDOWN=low and /EN=high This RS-232 RS-232 /a> to RS-485 protocol converter uses two products for a complete operational system. The circuit will comply with all EIA and ITU specifications for RS-232 RS-232 /a> to RS-485 RS422 conversion. This is a rugged design that will handle +/-15kV ESD levels on the bus pins. The design is compatible with 3. 3V or 5V systems requiring only one pin compatible device change. Only six external capacitors are required, giving the design a small footprint. The RS-232 >SP3220 has receiver enable control (/EN) and driver shutdown control (/SHUTDOWN) if power saving is required. (Schematic figure 1) The SP3070/6 (14 pin package) CAN be substituted for the SP3071/7 to also shutdown the RS-485 transceiver. This provides power savings and extended battery life for low power systems. (Schematic figure 2) /SHUTDOWN=low and /EN=high



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