AS1115_12 datasheet(2/26 Pages) AMSCO

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D a ta s h e e t

1 General Description

The AS1115 is a compact LED driver for 64 single LEDs or 8 digits of

7-segments. The devices can be programmed via an I²C compatible

2-wire interface.

Every segment can be individually addressed and updated sepa-

rately. Only one external resistor (RSET) is required to set the cur-

rent. LED brightness can be controlled by analog or digital means.

The devices include an integrated BCD code-B/HEX decoder, multi-

plex scan circuitry, segment and display drivers, and a 64-bit mem-

ory. Internal memory stores the shift register settings, eliminating the

need for continuous device reprogramming.

All outputs of the AS1115 can be configured for key readback. Key-

switch status is obtained by polling for up to 64 keys while 16 keys

can be used to trigger an interrupt.

Additionally the AS1115 offers a diagnostic mode for easy and fast

production testing.

The AS1115 features a low shutdown current of typically 200nA, and

an operational current of typically 350 A. The number of digits can

be programmed, the devices can be reset by software, and an exter-

nal clock is also supported.

The device is available in a QSOP-24 and the TQFN(4x4)-24 pack-

age.

Figure 1. AS1115 - Typical Application Diagram

2 Key Features

up to 1MHz I²C-Compatible Interface

Individual LED Segment Control

Readback for 16 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: 2.7 to 5.5V

Software Reset

Optional External Clock

Package:

- QSOP-24

- TQFN(4x4)-24

3 Applications

The AS1115 is ideal for seven-segment or dot matrix user interface

displays of set-top boxes, VCRs, DVD-players, washing machines,

micro wave ovens, refrigerators and other white good or personal

electronic applications.

AS1115

DIG0 to

DIG7

SEGA-DP

KEY0-7

SDA

SCL

IRQ

VDD

ISET

SDA

IRQ

GND

SCL

2.7 to 5.5V

9.53k

Ω

µP

KEYA

KEYB

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