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AS1117
Datasheet - D e t a i l e d D e s c r i p t i o n
Table 11. HEX Font
Char-
Register Data
Char-
Register Data
Char-
Register Data
acter D7 D6:D4 D3 D2 D1 D0 acter D7 D6: D4 D3 D2 D1 D0 acter D7 D6:D4 D3 D2 D1 D0
X
0
0
1
1
X
1
0
0
1
X
1
1
1
1
X
0
1
0
0
X
1
0
1
0
*
1
X
X
X
X
X
X
0
1
0
1
X
1
0
1
1
*
The decimal point can be enabled with every character by setting bit D7 = 1.
Table 12. No-Decode Mode Data Bits and Corresponding Segment Lines
D7
D6
D5
D4
D3
D2
D1
D0
Corresponding Segment Line
DP
A
B
C
D
E
F
G
I2C Self Addressing
If this feature is used, 2 of the 8 key readback nodes can be left open or shorted for self-addressing. This is done with
KEY together with SEGG and SEGF. This two nodes cannot be used for key-readback in this case. After startup all
devices have the predefined adress 0000000. A single command for selfaddressing will update all connected AS1117.
This command has to be done after startup or everytime the AS1117 gets disconnected from the supply. The I2C
address definition must be done with fixed connection, since I2C detection is excluded from debounce time of key reg-
isters.
Note: A short writes a logical “0” whereas an open writes a logical “1” as address bit.
Table 13. Self Addressing Register (Address (HEX) = 0x2D))
D7
D6
D5
D4
D3
D2
D1
D0
Factory-set IC address
User-set IC address
X
X
X
X
X
X
X
X
X
X
X
X
X
X
0
1
Keyscan Register
These two registers contain the result of the keyscan input of the 8 keys. To ensure proper results the data in these
registers are updated only if the logic data scanned is stable for 20ms (debounce time). A change of the data stored
within these two registers is indicated by a logic low on the IRQ pin. The IRQ is high-impedance if a read operation on
the key scan registers is started.
Table 14. LED Diagnostic Register Address
Register HEX Address
D7
D6
D5
Segment
D4 D3
D2
D1
D0
0x1C
KEY
DP
A
B
C D
E
F
G
Note: If I2C self addressing is used segment G&F of KEY is used for the two LSB of the I2C address. In this case
these two nodes cannot be used as a key. Additionally the debounce time is disabled for these two bits.
The data within the keyscan register is updated continuously during every cycle (1/10 of refresh rate). There-
fore, to get a valid readback of keys it is recommended to read out the keyscan registers immediately after the
IRQ is triggered. A short writes a logical “0” whereas an open writes a logical “1” as keyscan register bit.
www.austriamicrosystems.com/LED-Driver-ICs/AS1117
Revision 1.00
15 - 23
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