AS1108-WL ams, AS1108-WL Datasheet - Page 9

• Manufacturer Part Number: AS1108-WL
• Description: LED Display Drivers
• Manufacturer: ams

Specifications of AS1108-WL

• Rohs: yes
• Number Of Digits: 4
• Number Of Segments: 7
• Mounting Style: SMD/SMT
• Package / Case: SOIC-20
• Operating Supply Voltage: 5 V
• Maximum Supply Current: 1 mA
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Number Of Leds: 1
• Power Dissipation: 941 mW

AS1108
Datasheet - D e t a i l e d D e s c r i p t i o n
Shutdown Register (0xXC)
The Shutdown Register controls AS1108 shutdown mode (see Shutdown Mode on page 8).
Table 8. Shutdown Register Format (Address (HEX) = 0xXC))
Decode Enable Register (0xX9)
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 12) 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 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 lists the code-B font; Table 11 lists the HEX font.
When no-decode mode is selected, data bits D7:D0 of the Digit-Registers correspond to the segment lines of the
AS1108. Table 12 shows the 1:1 pairing of each data bit and the appropriate segment line.
Figure 11. Standard 7-Segment LED Intensity Control and Inter-Digit Blanking
Table 10. Code-B Font
www.austriamicrosystems.com/LED-Driver-ICs/AS1108
Table 9. Decode Enable Register Format (Address (HEX) = 0xX9))
Normal Operation, Feature Register Unchanged
Shutdown Mode, Feature Register Unchanged
Code-B/HEX decode for digit 0. No decode for digits 3:1
Reset Feature Register to Default Settings
Reset Feature Register to Default Settings
7-Segment
Character
0
1
2
3
4
5
Code-B/HEX decode for digits 3:0
Normal Operation,
Shutdown Mode,
No decode for digits 3:0
Mode
Decode Mode
D7
†
D6:D4
X
X
X
X
X
X
Register Data
D3
0
0
0
0
0
0
D2
0
0
0
0
1
1
E
F
D
HEX Code
G
D1
Revision 2.12
A
0
0
1
1
0
0
0x00
0x80
0x01
0x81
C
DP
B
D0
HEX Code
0
1
0
1
0
1
0xFF
0x00
0x01
DP
D7
†
0
1
0
1
A
D7
1
0
1
1
0
1
X
X
X
D6
X
X
X
X
D6
X
X
X
B
1
1
1
1
1
0
D5
X
X
X
X
On Segments = 1
Register Data
D5
X
X
X
C
1
1
0
1
1
1
Register Data
D4
X
X
X
X
D4
X
X
X
D
1
0
1
1
0
1
D3
X
X
X
X
D3
0
0
1
E
D2
1
0
1
0
0
0
X
X
X
X
D2
0
0
1
D1
F
1
0
0
0
1
1
X
X
X
X
D1
0
0
1
9 - 19
D0
D0
G
0
0
1
1
1
1
0
0
1
1
1
1
0