AS1115 austriamicrosystems AG, AS1115 Datasheet - Page 13

• Manufacturer Part Number: AS1115
• Description: Interfaced LED Driver
• Manufacturer: austriamicrosystems AG

AS1115
Datasheet - D e t a i l e d D e s c r i p t i o n
The Shutdown Register controls AS1115 shutdown mode.
Table 7. Shutdown Register Format (Address (HEX) = 0x0C))
Decode Enable Register (0x09)
The Decode Enable Register sets the decode mode. BCD/HEX decoding (either BCD code – characters 0:9, E, H, L,
P, and -, or HEX code – characters 0:9 and A:F) is selected by bit D2 (page 18) of the Feature Register. The Decode
Enable Register is used to select the decode mode or no-decode for each digit. Each bit in the Decode Enable Regis-
ter corresponds to its respective display digit (i.e., bit D0 corresponds to digit 0, bit D1 corresponds to digit 1 and so
on).
Note: A logic high enables decoding and a logic low bypasses the decoder altogether.
When decode mode is used, the decoder looks only at the lower-nibble (bits D3:D0) of the data in the Digit-Registers,
disregarding bits D6:D4. Bit D7 sets the decimal point (SEG DP) independent of the decoder and is positive logic (bit
D7 = 1 turns the decimal point on).
When no-decode mode is selected, data bits D7:D0 of the Digit-Registers correspond to the segment lines of the
AS1115.
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Table 6. Register Address Map
Table 8. Decode Enable Register Format Examples
Normal Operation, Feature Register Unchanged
Code-B/HEX decode for digits 0:5. No decode for digits 7:6
Code-B/HEX decode for digit 0:2. No decode for digits 7:3
Shutdown Mode, Feature Register Unchanged
Code-B/HEX decode for digit 0. No decode for digits 7:1
Reset Feature Register to Default Settings
Reset Feature Register to Default Settings
Table 9
Diagnostic Digit 0
Diagnostic Digit 1
Diagnostic Digit 2
Diagnostic Digit 3
Diagnostic Digit 4
Diagnostic Digit 5
Diagnostic Digit 6
Diagnostic Digit 7
Table 11
Register
KEYB
KEYA
Code-B/HEX decode for digits 0,2,5.
lists some examples of the possible settings for the Decode Enable Register bits.
No decode for digits 1, 3, 4, 6, 7
Normal Operation,
Shutdown Mode,
shows the 1:1 pairing of each data bit to the appropriate segment line.
No decode for digits 7:0
Mode
Decode Mode
D15:D13
000
000
000
000
000
000
000
000
000
000
Table 9
D12
1
1
1
1
1
1
1
1
1
1
lists the code-B font;
D11
0
0
0
1
1
1
1
1
1
1
Revision 1.03
HEX Code
D10
1
1
1
0
0
0
0
0
1
1
0x00
0x80
0x01
0x81
HEX Code
Address
D9
Table 10
0x3F
0x00
0x01
0x07
0x25
0
0
1
1
0
0
1
1
0
0
D7
0
1
0
1
D8
0
1
0
1
0
1
0
1
0
1
lists the HEX font.
D7
0
0
0
0
0
D6
X
X
X
X
D6
0
0
0
0
0
D5
X
X
X
X
Register Data
D5
0
0
0
1
1
Register Data
D4
X
X
X
X
D7:D0
D4
0
0
0
1
0
D3
X
X
X
X
D3
0
0
0
1
0
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D2
X
X
X
X
D2
0
0
1
1
1
D1
X
X
X
X
D1
0
0
1
1
0
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N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
D0
D0
0
0
1
1
1
1
1
1
0