SER7 Datasheet, PDF (10/11 Pages) ABCircuits – Serial to Seven Segment Controller Expandable to 32 digits

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Theory Of Operation
The SER7 IC is a custom programmed microprocessor designed to monitor a serial input and
convert the received data to seven segment format.
When a byte is received on the SIN- pin, bit 8 is cleared. The byte is then saved in the buffer. If
the byte is a carriage return (0D hex) the IC uses the ADR0-3 inputs to determine which two
bytes in the buffer are converted to seven segment format and displayed.
The data is standard asynchronous format 8 data bits, 1 stop bit and no parity. Baud rate is 9600
BPS. It is recommended that the display data be sent periodically even if there is no change, to
recover from power failure or serial data errors.
Part Number SER7
Copyright © 2014 ABCircuits. Revised September 2014 Page 10 of 11