9-26

Performance Curves

FIGURE 4. SEGMENT CURRENT vs OUTPUT VOLTAGE

FIGURE 5. CHARACTER CURRENT VS OUPUT VOLTAGE

30

20

10

01

2

3

SEGMENT VOLTAGE (V)

4.5V

5.0V

0

4.5V

5.0V

01

2

3

SEGMENT VOLTAGE (V)

100

200

300

400

500

Pin Descriptions

SIGNAL

PIN

FUNCTION

ICM7243A(B)

D0 - D5

10 - 15

(8 - 13)

Six-Bit ASCll Data input pins (active high).

CS, CS

16

(14 - 16)

Chip Select from

µP address decoder, etc.

WR

17

WRite pulse input pin (active low). For an active high write pulse, CS can be used, and WR can be

used as CS.

MODE

31

Selects data entry MODE. High selects Sequential Access (SA) mode where first entry is

displayed in “leftmost” character and subsequent entries appear to the “right”. Low selects the

Random Access (RA) mode where data is displayed on the character addressed via A0 - A2

Address pins.

A0/SEN

30

In RA mode it is the LSB of the character Address. In SA mode it is used for cascading devices for

displays of more than 8 characters (active high enables device controller).

A1/CLeaR

29

In RA mode this is the second bit of the address. In

Address Counter, the Data Memory and the display.

A2/DISPlay

FULL

28

In

indicating DISPlay FULL.

OSC/OFF

27

external oscillator can be applied to this pin. A low at this input sets the device into a (shutdown)

mode, shutting OFF the display and oscillator but retaining data stored in memory.

SEG a - SEG m,

DP

2 - 9, 32 - 40

(2 - 7), (32 - 40)

SEGment driver outputs.

CHARacter 1 - 8

18 - 21,

23 - 26

CHARacter driver outputs.

ICM7243