AS1116 Datasheet, PDF (1/20 Pages) ams AG – 64 LED Driver with Detailed Error Detection

AS1116
64 LED Driver with Detailed Error Detection
Datasheet
1 General Description
The AS1116 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 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.
Additionally the AS1116 offers a diagnostic mode for
easy and fast production testing and allows the use of
the AS1116 for critical applications. The diagnostic
allows to detect individual open or shorted LEDs.
The AS1116 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 TQFN(4x4)-
24 package.
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: 2.7 to 5.5V
! Software Reset
! Optional External Clock
! Package:
- QSOP-24 and TQFN(4x4)-24
3 Applications
The AS1116 is ideal for seven-segment or dot matrix dis-
plays in public information displays at subway, train or
bus stations, at airports and also at displays in public
transportation like buses or trains m, obile phones, per-
sonal electronic and toys.
Figure 1. Typical Application Diagram
VDD
2.7V to 5.5V
8
DIG0 to
DIG7 SEGA-DP
8
8
9.53kΩ
ISET
SDI
I/O
AS1116
GND
SDO SDI ^AS1116 SDO
µP
I/O
I/O
SCL
LD
SCL
LD
I/O
Diagnostic readback: open & shorted LEDs
www.austriamicrosystems.com
Revision 1.04
8
8
SDI ^AS1116 SDO
SCL
LD
1 - 20