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AS1117
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 26 shows the AS1117 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 12 .
The Decode Enable Register ( see page 13 ) must be set to ‘00000000’ as described in Table 9 on page 14 . Single
LEDs in a column can be addressed as described in Table 12 on page 15 , where bit D0 corresponds to segment G and
bit D7 corresponds to segment DP.
Figure 26. Application Example as LED Dot Matrix Driver
V DD
2.7V to 5V
9.53k Ω
VDD
ISET
DIG0 to
DIG7
SEG A to G
SDA
SDA
AS1117
SEP DP
Diode Arrangement
μP
SCL
IRQ
SCL
IRQ
RESETN
GND
Keyscan
The key readback of the AS1117 can be used either for push buttons as well as switches. If only a single key is
pressed (shorted) at a time no additional diodes are required. If a detection of multiple simultaneous keystrokes is
required diodes within the keypath, as shown in Figure 27 , are required. Pressing multiple keys without the diodes
would result in ambiguous results.
Figure 27. Keyscan Configuration
SEGA
SEGB
SEGC
SEGD
SEG E
SEGF
SEGG
SEGDP
KEY
IRQ
Diodes are optional and only required if multiple keystrokes must be
detected simultaneously.
If I2C Self-Adressing is used these two keys cannot be used for read-
back and must be either hard wired opened or shorted.
A short writes a logical “1” whereas an open writes a logical “0” as
address bit.
Supply Bypassing and Wiring
In order to achieve optimal performance the AS1117 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 and a 0.1μF ceramic capacitor between pins VDD and GND to
avoid power supply ripple ( see Figure 16 on page 8 ).
www.austriamicrosystems.com/LED-Driver-ICs/AS1117
Revision 1.00
20 - 23
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