AS1117 datasheet(2/24 Pages) AMSCO

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AS1117

64 LED Driver for Mobile Applications with Error Detection

www.austriamicrosystems.com/LED-Driver-ICs/AS1117

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Datasheet

1 General Description

The AS1117 is a compact LED driver for 64 single LEDs

or 8 digits of 7-segments. The devices can be pro-

grammed via an I²C compatible 2-wire interface. Every

segment can be individually addressed and updated

separately. Only one external resistor (RSET) is required

to set the current. LED brightness can be controlled by

analog or digital means.

The devices include an integrated BCD code-B/HEX

decoder, multiplex scan circuitry, segment and display

drivers, and a 64-bit memory. Internal memory stores

the shift register settings, eliminating the need for contin-

uous device reprogramming.

Additionally the AS1117 offers a detailed error diagnostic

mode for easy and fast production testing in critical

applications. The AS1117 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. AS1117 - Typical Application Diagram

2 Key Features

3.4MHz I²C-Compatible Interface

Individual LED Segment Control

Readback for 8 Keys plus Interrupt

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)

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

Up to 4 devices cascadable

Optional External Clock

Package: TQFN(4x4)-24

3 Applications

The AS1117 is ideal for seven-segment or dot matrix

user interface displays of mobile applications, set-top

boxes, VCRs, DVD-players, washing machines, micro

wave ovens, refrigerators and other white good or per-

sonal electronic applications.

Table 1. Available Products

Devices

RESET Input

Interfaces

AS1115

I²C

AS1116

SPI

AS1117

yes

I²C

AS1118

yes

SPI

AS1117

DIG0 to

DIG7

SEGA-DP

KEY0-7

SDA

SCL

IRQ

VDD

ISET

SDA

IRQ

GND

SCL

2.7V to 5.5V

9.53k

µP

KEY

RESETN

VDD

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