AS1116-BSST(2009) 데이터 시트보기 (PDF) - austriamicrosystems AG

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AS1116-BSST
(Rev.:2009)

64 LED Driver with Detailed Error Detection

austriamicrosystems AG 

AS1116

Datasheet - Typical Application

8x8 Dot Matrix Mode

The application example in Figure 20 shows the AS1116 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 7 on page 9.

The Decode Enable Register (see page 10) must be set to ‘00000000’ as described in Table 9 on page 10. Single

LEDs in a column can be addressed as described in Table 12 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 AS1116 devices can be cascaded easily.

Figure 20. Application Example as LED Dot Matrix Driver

VDD

2.7 to 5V

9.53kΩ

DIG0 to

DIG7

ISET

SEG A to G

SEP DP

I/O

SDI AS1116

I/O

SCL

Diode Arrangement

µP I/O

LD

SDO

I/O

Diagnostic

readback: open

GND

& shorted LEDs

Supply Bypassing and Wiring

In order to achieve optimal performance the AS1116 should be placed very close to the LED display to minimize effects

of electromagnetic interference and wiring inductance.

Furthermore, it is recommended to connect a 10µF electrolytic and a 0.1µF ceramic capacitor between pins VDD and

GND to avoid power supply ripple (see Figure 20 on page 16).

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