 2000 Infineon Technologies Corp. • Optoelectronics Division • San Jose, CA

SCD5580/1/2/3/4 A

www.infineon.com/opto • 1-888-Infineon (1-888-463-4636)

OSRAM Opto Semiconductors GmbH & Co. OHG • Regensburg, Germany

www.osram-os.com • +49-941-202-7178

12

March 23, 2000-18

Cascading Multiple Displays

Multiple displays can be cascaded using the CLK SEL and

CLK I/O pins as shown below. The display designated as the

Master Clock source should have its CLK SEL pin tied high and

the slaves should have their CLK SEL pins tied low. All CLK I/O

pins should be tied together. One display CLK I/O can drive

15 slave CLK I/Os. Use RST to synchronize all display counters.

Figure 14. Cascading Multiple Displays

Loading Data Into the Display

Use following procedure to load data into the display:

1. Power up the display.

2. Bring RST low (600 ns duration minimum) to clear the Multiplex Counter, Address Register, Control

Word Register, User RAM and Data Register. The display will be blank. Display brightness is set to 100%.

3. If a different brightness is desired, load the proper brightness opcode into the Control Word Register.

4. Load the Digit Address into the display.

5. Load display row and column data for the selected digit.

6. Repeat steps 4 and 5 for all digits.

RST

CLK I/O

CLK SEL

DATA

SDCLK

LOAD

14 more displays

in between

RST

CLK I/O

CLK SEL

DATA SDCLK

LOAD

Chip

Address

Decoder

0

15

Address Decode 1–14

RST

DATA

SDCLK

A0

A1

A2

A3

LD

Intelligent Display

Intelligent Display

CE