www.austriamicrosystems.com/LED-Driver-ICs/AS1118

Revision 1.01

16 - 20

AS1118

Datasheet - Ty p i c a l A p p l i c a t i o n

8x8 Dot Matrix Mode

The application example in Figure 20 shows the AS1118 in the 8x8 LED dot matrix mode.

The LED columns have common cathodes and are connected to the DIG0:7 outputs. The rows are connected to the

segment drivers. Each of the 64 LEDs can be addressed separately. The columns are selected via the digits as listed

in Table 8 on page 9.

The Decode Enable Register (see page 10) must be set to ‘00000000’ as described in Table 10 on page 10. Single

LEDs in a column can be addressed as described in Table 13 on page 11, where bit D0 corresponds to segment G and

bit D7 corresponds to segment DP.

Note: For a multiple-digit dot matrix, multiple AS1118 devices can be cascaded easily.

Figure 20. Application Example as LED Dot Matrix Driver

Supply Bypassing and Wiring

In order to achieve optimal performance the AS1118 should be placed very close to the LED display to minimize effects

of electromagnetic interference and wiring inductance.

GND to avoid power supply ripple (see Figure 15 on page 7).

AS1118

I/O

I/O

I/O

ISET

SDI

LD

GND

SCL

2.7V to 5V

9.53k

Ω

µP

I/O

Diagnostic

readback: open

& shorted LEDs

SDO

Diode Arrangement

DIG0 to

DIG7

SEG A to G

SEP DP

VDD

RESETN