CMX867A Low Power V.22 Modem

Description: This RS-232 to RS-485 protocol converter utilizes two components to form a complete operational system. The circuit adheres to all EIA and ITU specifications for RS-232 to RS-485 RS422 conversion. It features a robust design capable of handling ±15kV ESD levels on the bus pins. The design is compatible with both 3.3V and 5V systems, requiring only a single pin-compatible device change. A total of six external capacitors are necessary, resulting in a compact footprint. The RS-232 SP3220 includes receiver enable control (/EN) and driver shutdown control (/SHUTDOWN) for power-saving options. The SP3070/6, a 14-pin package, can be replaced with the SP3071/7 to also disable the RS-485 transceiver, which enhances power savings and extends battery life in low-power applications. The shutdown state is defined as /SHUTDOWN=low and /EN=high.

This RS-232 to RS-485 protocol converter is designed to facilitate robust communication in various applications requiring reliable data transmission over longer distances. The circuit is engineered to meet stringent industry standards, ensuring compatibility with existing systems while providing a high level of protection against electrical disturbances. The ±15kV ESD protection on the bus pins significantly enhances the durability of the device in harsh environments, making it suitable for industrial applications.

The architecture of the converter is streamlined, requiring only six external capacitors, which minimizes the overall size of the circuit board. This compactness is beneficial in applications where space is limited, allowing for easier integration into existing designs without substantial redesign efforts. The choice of using the SP3220 for RS-232 interfacing ensures that the device can operate effectively at both 3.3V and 5V logic levels, thus providing flexibility in system design.

The control features of the SP3220, specifically the receiver enable (/EN) and driver shutdown (/SHUTDOWN) functionalities, are critical for power management. These features allow the system to conserve energy by disabling the transceiver during periods of inactivity, which is particularly advantageous in battery-operated devices. The ability to substitute the SP3070/6 with the SP3071/7 further enhances design flexibility, allowing designers to optimize for power consumption without compromising performance.

In summary, this RS-232 to RS-485 protocol converter is a versatile and reliable solution that meets the needs of modern electronic communication systems, ensuring robust performance, ease of integration, and efficient power management.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 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