D atas he et
A S 111 8
64 L E D D r i v er fo r M o b i l e A p p l i ca ti on s w i th E r r or D e te ct i o n
1 General Description
The AS1118 is a compact LED driver for 64 single LEDs
or 8 digits of 7-segments. The devices can be pro-
grammed via an SPI compatible 3-wire interface. Every
segment can be individually addressed and updated
separately. Only one external resistor (R
SET
) is required
to set the current. LED brightness can be controlled by
analog or digital means. The devices include an inte-
grated BCD code-B/HEX decoder, multiplex scan cir-
cuitry, segment and display drivers, and a 64-bit
memory. Internal memory stores the shift register set-
tings, eliminating the need for continuous device repro-
gramming.
Table 1. Available Products
Devices
AS1115
AS1116
AS1117
AS1118
2 Key Features
10MHz SPI-Compatible Interface
Hexadecimal- or BCD-Code for 7-Segment Displays
200nA Low-Power Shutdown Current (typ; data
retained)
Individual Digit Brightness Control
Display Blanked on Power-Up
Digital and Analog Brightness Control
Drive Common-Cathode LED Displays
Supply Voltage Range: 2.7V to 5.5V
Software and Hardware Reset
Optional External Clock
Package: TQFN(4x4)-24
Additionally the AS1118 offers a detailed error diagnostic
mode for easy and fast production testing in critical
applications. The AS1118 features a low shutdown cur-
rent of typically 200nA, and an operational current of
typically 350µA. The number of digits can be pro-
grammed, the devices can be reset by software, and an
external clock is also supported. The device is available
in a TQFN(4x4)-24 package.
Figure 1. AS1118 - Typical Application Diagram
Te
c
V
DD
2.7V to 5.5V
hn
ic a
al m
co s
A
nt G
en
ts
til
RESET Input
no
no
Interfaces
I²C
SPI
I²C
yes
yes
SPI
3 Applications
The AS1118 is ideal for seven-segment or dot matrix dis-
,
plays in mobile applications, public information displays
at subway, train or bus stations, at airports and also at
displays in public transportation like buses or trains, per-
sonal electronic and toys.
8
SEGA-DP
VDD
DIG0 to
DIG7
8
8
9.53kΩ
ISET
SDI
GND
AS1118
SDO SDI
AS1118
SDO
I/O
SDI
µP
I/O
I/O
I/O
I/O
RESETN SCL
LD
RESETN SCL LD
RESETN SCL LD
Diagnostic readback: open & shorted LEDs
Revision 1.01
lv
8
8
AS1118
al
SDO
id
1 - 20
Open and Shorted LED Error Detection
- Global or Individual Error Detection
AMSCO [ AUSTRIAMICROSYSTEMS AG ]
