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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 7. Register Address Map
Register
Decode-Mode
Global Intensity
Scan Limit
Shutdown
Self-Adressing
Feature
Display Test Mode
D15:D13
000
000
000
000
001
000
000
D12
0
0
0
0
0
0
0
D11
1
1
1
1
1
1
1
D10
0
0
0
1
1
1
1
Address
D9
0
1
1
0
0
1
1
D8
1
0
1
0
1
0
1
D7:D0
( see Table 9 on page 14 )
( see Table 18 on page 17 )
( see Table 20 on page 17 )
( see Table 8 on page 13 )
( see Table 21 on page 18 )
( see Table 15 on page 16 )
Page
13
17
17
12
N/A
18
14
DIG0:DIG1 Intensity
DIG2:DIG3 Intensity
DIG4:DIG5 Intensity
DIG6:DIG7 Intensity
Diagnostic Digit 0
Diagnostic Digit 1
Diagnostic Digit 2
Diagnostic Digit 3
Diagnostic Digit 4
Diagnostic Digit 5
Diagnostic Digit 6
Diagnostic Digit 7
KEY
000
000
000
000
000
000
000
000
000
000
000
000
000
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
1
1
1
1
1
1
0
0
0
0
1
1
1
0
0
0
0
0
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
( see Table 19 on page 17 )
( see Table 19 on page 17 )
( see Table 19 on page 17 )
( see Table 19 on page 17 )
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
The Shutdown Register controls AS1117 shutdown mode.
Table 8. Shutdown Register Format (Address (HEX) = 0x0C))
Mode
HEX Code
D7
D6
D5
Register Data
D4 D3
D2
D1
D0
Shutdown Mode,
Reset Feature Register to Default Settings
Shutdown Mode, Feature Register Unchanged
Normal Operation,
Reset Feature Register to Default Settings
Normal Operation, Feature Register Unchanged
0x00
0x80
0x01
0x81
0
1
0
1
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
0
0
1
1
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). Table 10 on page 14 lists some examples of the possible settings for the Decode Enable Register bits.
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). Table 10 on page 14 lists the code-B font; Table 11 on page 14 lists the HEX font.
www.austriamicrosystems.com/LED-Driver-ICs/AS1117
Revision 1.00
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