AS1108-WL ams, AS1108-WL Datasheet - Page 8

• 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

Table 7. Register Address Map
AS1108
Datasheet - D e t a i l e d D e s c r i p t i o n
Shutdown Mode
The AS1108 features a shutdown mode, consuming only 10µA (max) current. Shutdown mode is entered via a write to
the Shutdown Register (see Table 8). At that point, all segment current sources are pulled to ground and all digit driv-
ers are connected to V
Note: During shutdown mode the Digit-Registers maintain their data.
Shutdown mode can either be used as a means to reduce power consumption or for generating a flashing display
(repeatedly entering and leaving shutdown mode). For minimum supply current in shutdown mode, logic input should
be at GND or V
The device needs typically 250µs to exit shutdown mode, and during shutdown mode the AS1108 is fully programma-
ble. Only the display test mode (see page 10) overrides shutdown mode.
When entering or leaving shutdown mode, the Feature Register is reset to its default values (all 0s) when Shutdown
Register bit D7 (page 9) = 0. When bit D7 = 1, the Feature Register is left unchanged when entering or leaving shut-
down mode.
Note: If the AS1108 is used with an external clock, Shutdown Register bit D7 should be set to 1 when writing to the
Digit- and Control-Registers
The AS1108 contains four Digit-Registers and six control-registers, which are listed in Table 7. All registers are
selected using a 4-bit address word, and communication is done via the serial interface.
www.austriamicrosystems.com/LED-Driver-ICs/AS1108
without rewriting the whole register contents.
down, display test and features selection registers.
Digit Registers – These registers are realized with an on-chip 32-bit memory. Each digit can be controlled directly
Control Registers – These registers consist of decode mode, display intensity, number of scanned digits, shut-
Intensity Control
Decode-Mode
Shutdown Register.
Display Test
Scan Limit
Shutdown
Register
Feature
No-Op
Digit 0
Digit 1
Digit 2
Digit 3
N/A
DD
(CMOS logic level).
DD
, so that all segments are blanked.
HEX Code
0xXA
0xXB
0xXC
0xXD
0xXE
0xX0
0xX1
0xX2
0xX3
0xX4
0xX9
0xXF
D15:D12
X
X
X
X
X
X
X
X
X
X
X
X
Revision 2.12
D11
0
0
0
0
0
1
1
1
1
1
1
1
Address
D10
0
0
0
0
1
0
0
0
1
1
1
1
D9
0
0
1
1
0
0
1
1
0
0
1
1
D8
0
1
0
1
0
1
0
1
0
1
0
1
Page
N/A
N/A
N/A
N/A
N/A
12
11
11
12
10
9
9
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