AS1115
64 LEDs, I²C Interfaced LED Driver with Keyscan
www.austriamicrosystems.com Revision 1.03 1 - 24
Datasheet
1 General Description
The AS1115 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 (R
SET) is
required to set the current. LED brightness can be con-
trolled 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.
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 us ed to tri g ge r an inte r-
rupt.
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 typicall y 350µA.
The number of digits can be programmed, the devices
can be reset by software, and an external clock is also
supported.
The device is available in a QSOP-24 and the
TQFN(4x4)-24 package.
Figure 1. Typical Application Diagram
2 Key Features
! 3.4MHz I²C-Compatible Interface
! Individual LED Segment Control
! Readback for 16 Keys plus Interrupt
! Open and Shorted LED Erro r Dete cti o n
- 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 o n Powe r-U p
! 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, refriger-
ators and other white good or personal electronic appli-
cations.
AS1115
DIG0 to
DIG7
SEGA-DP
KEY0-7
8
SDA
SCL
IRQ
V
DD
ISET
SDA
IRQ
GND
SCL
2.7 to 5.5V
9.53kΩ
µP
8
KEYA
KEYB
8