ELM627中文资料RS232 Break Detector数据手册ELM规格书

描述 Description

The ELM627 is a complete circuit for detecting break signals on RS232 lines, in an 8 pin package. This is useful for remotely resetting circuits through a serial link. For convenience, this circuit also generates an output pulse on power-up.

The timing threshold for break signal detection is user selectable, allowing the circuit to respond to transmitted null characters, @, at various baud rates. This provides a convenient means for the remote triggering of this circuit by simply shifting to a lower baud rate and sending a null byte.

Two complementary high current outputs are provided by the ELM627, so that further buffering is not usually required. The output signal can be selected to be either a continuous one (following the TxD input line) or else a 100ms pulse output.

No external components are required for circuit operation other than possibly a current limiting resistor, as all timing references are generated internally.

特性 Features

·Low power CMOS design – typically 1mA at 5V
·No external timing elements required
·Complementary outputs
·Digitally controlled threshold timing
·Selectable output duration
·High current drive outputs – up to 25 mA

应用 Application

·Remote resetting of RS232 devices
·Edge triggered one-shot circuits
·Digitally controlled sequencing schemes
·Watchdog type signal monitors