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SER7 Datasheet, PDF (4/11 Pages) ABCircuits – Serial to Seven Segment Controller Expandable to 32 digits
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POL
Polarity input. If this pin is open or high, the “on” segments will have a high level on the SEG
outputs of the chip. If this pin is low or grounded “on” segments will output as a low on the SEG
pins. This pin is read once at power up and has a built in pull up resistor.
DP
Right or left hand decimal input. This pin should be open for right hand decimal displays or
grounded for left hand decimal displays. This pin is read once at power up and has a built in pull
up resistor.
JUST
Justification input. If this pin is open, the data received will be displayed right justified. If this pin
is low or grounded, the data received will be displayed left justified. This pin is read once at
power up and has a built in pull up resistor. See also the expansion examples.
SIN-
This is the serial input pin. It may be tied directly to the UART transmitter output of your UART or
microprocessor; to a RS -232 receiver such as the MAX232; an Ethernet interface such as the
Lantronix Xport; or a USB IC such as the FT232. This pin is high in the idle state, the input
format is 8 bits, 1 stop, no parity at 9600 BPS. Other formats and baud rates are available,
please contact the factory for information.
This pin does not have an internal pull up resistor. It is recommended your software periodically
send the data to the displays to recover from communications errors or power failures. You can
drive this input with any terminal program like REALTERM or HYPERTERM for testing and
development .
ADR0-3
These pins determine the device address. Up to 16 devices can be used on the same
communications channel, either on the same board, or on separate boards if a multi-drop
interface such as RS -485 is used. See the example circuits for expansion details.
Note that the JUST pin controls the placement of device address 0. If the pin is low, (left justify)
the Address 0 is on the left end of the chain, and the addresses increase going right. If this pin is
open or high, (right justify) the address 0 is on the right side, and addresses increase going left.
Part Number SER7
Copyright © 2014 ABCircuits. Revised September 2014 Page 4 of 11