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Part Number SER7

Copyright © 2014 ABCircuits. Revised September 2014 Page 9 of 11

Serial Input Stream

When a byte is received on the SIN- pin it is placed in the receive buffer. When a carriage return

code (Hex 0D) is received on the SIN- pin, the data in the buffer is translated and moved to the

displays, Afterward the buffer is cleared. The SER7 uses the ADR0-ADR3 pins to determine

which bytes in the buffer to display.

Notes:

Receive buffer size is 32 bytes.

Bit 8 (MSB of the data stream) is ignored.

Line feed characters (Hex 0A) are ignored.

The decimal point (Hex 2E) activates the decimal point output. The decimal point is not displayed

as a separate digit unless required. For instance “1.2” takes two digits to display. “12.” takes

two digits to display in right hand decimal mode and three digits to display in left hand decimal

mode. “.12” takes two digits to display in left hand decimal mode, and three digits to display in

right hand decimal mode. “.1.2.” will take three digits to display.

The data is format is 9600 BPS, 8 bits, 1 stop, no parity.

Absolute Maximum Ratings

Symbol

Description

Min

Typical

Max

Units

Notes

Storage Temperature

-55

25

+100

ºC

Operating Temperature

-40

+85

ºC

-0.5

+6.0

V

Input Voltage

V

Maximum current into any pin

-25

+50

mA

ESD

Electrostatic Discharge Voltage

2000

V

Human Body Model

ESD

LU

Latch up current

200

mA

DC Electrical Characteristics

Symbol

Description

Min

Typical

Max

Units

Notes

Supply Voltage

2.4

5.25

V

Supply Current

3

8

mA

Note 1

High Output Level

V

Note 2

Low Output Voltage

0.75

V

Note 3

Input High Level

2.1

V

Input Low Level

0.8

V

High Level Source Current

10

mA

Note 2

Low Level Sink Current

25

mA

Note 3

Capacitive load

3.5

10

pF

Input leakage

1

nA

Pull Up Resistors On Inputs

4

5.6

8

k?

Note 1: Vdd=5VDC, all inputs and outputs open