AS1115 Datasheet, PDF (1/24 Pages) ams AG – 64 LEDs, I²C Interfaced LED Driver with Keyscan

AS1115
64 LEDs, I²C Interfaced LED Driver with Keyscan
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 (RSET) 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 used to trigger an inter-
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 typically 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.
2 Key Features
! 3.4MHz 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, refriger-
ators and other white good or personal electronic appli-
cations.
Figure 1. Typical Application Diagram
VDD
2.7 to 5.5V
9.53kΩ
DIG0 to
DIG7
8
ISET
SEGA-DP
KEY0-7
8
SDA ^AS1115
SDA
8
SCL
SCL
KEYA
IRQ
µP IRQ
KEYB
GND
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Revision 1.03
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