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1 General Description
The AS1116 is a compact LED driver for 64 single LEDs or 8 digits of
7-segments. The devices can be programmed via an SPI compatible
3-wire interface.
Every segment can be individually addressed and updated sepa-
rately. Only one external resistor (R SET ) 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.
Additionally the AS1116 offers a diagnostic mode for easy and fast
production testing and allows the use of the AS1116 for critical appli-
cations. 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 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 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 displays in pub-
lic information displays at subway, train or bus stations, at airports
and also at displays in public transportation like buses or trains
mobile phones, personal electronic and toys.
Figure 1. AS1116 - Typical Application Diagram
8
SEGA to G,
DIG0 to
V DD
2.7V to 5.5V
SEG DP
DIG7
8
8
8
8
9.53k ?
ISET
AS1116
GND
I/O
SDI
SCL
LD
SDO SDI
SCL
AS1116
LD
SDO
SDI
SCL
AS1116
LD
SDO
μP
I/O
I/O
I/O
Diagnostic readback: open & shorted LEDs
Revision 1.08
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