A S 111 8

6 4 L E D D r i v e r f o r M o b i l e A p p l i c a t i o n s w i t h E r r o r D e t e c t i o n

www.austriamicrosystems.com/LED-Driver-ICs/AS1118

Revision 1.01

1 - 20

D a ta s h e e t

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

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.

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

2 Key Features

10MHz SPI-Compatible Interface

Open and Shorted LED Error Detection

- Global or Individual Error Detection

Hexadecimal- or BCD-Code for 7-Segment Displays

200nA Low-Power Shutdown Current (typ; data

retained)

Individual Digit Brightness Control

Digital and Analog Brightness Control

Display Blanked on Power-Up

Drive Common-Cathode LED Displays

Supply Voltage Range: 2.7V to 5.5V

Software and Hardware Reset

Optional External Clock

Package: TQFN(4x4)-24

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.

Table 1. Available Products

Devices

RESET Input

Interfaces

AS1115

no

I²C

AS1116

no

SPI

AS1117

yes

I²C

AS1118

yes

SPI

AS1118

DIG0 to

DIG7

SEGA-DP

I/O

I/O

I/O

ISET

SDI

LD

GND

SCL

2.7V to 5.5V

9.53k

Ω

µP

8

SDO

AS1118

SDI

LD

RESETN

SDO

AS1118

SDI

LD

RESETN

SDO

I/O

8

8

8

8

Diagnostic readback: open & shorted LEDs

I/O

RESETN

SCL

SCL

VDD

,