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Datas h eet
A S111 6
6 4 L E D Dr iv e r w i th De t a ile d E r r o r D et e c tio n
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
Figure 1. AS1116 - Typical Application Diagram
V
DD
2.7V to 5.5V
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3 Applications
8
SEGA to G,
SEG DP
DIG0 to
DIG7
8
8
8
8
9.53kΩ
GND
ISET
SDI
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.
AS1116
SDO SDI
AS1116
LD
SDO
I/O
SDI
SCL
LD
SCL
µP
I/O
I/O
I/O
Diagnostic readback: open & shorted LEDs
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Revision 1.08
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SCL
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Datasheet - P i n o u t
4 Pinout
Pin Assignments
Figure 2. Pin Assignments (Top View)
SEGD
SEGDP
DIG1
DIG0
SDO
SDI
22 SEGDP
21 SEG E
18 SEGG
23 SEGD
20 SEGC
17 SEGB
15 SEGA
16 SEGF
24 SDO
19 VDD
14 SCL
13 I
SET
24 23 22 21 20 19
DIG2
1
DIG3
2
GND
3
18
SEG E
17
SEGC
DIG5
5
DIG7 10
DIG0 2
DIG1 3
DIG2 4
DIG3 5
GND 6
DIG4 7
DIG5 8
DIG6 9
N/C 12
SDI 1
LD 11
N/C
6
7
8
9
Pin Descriptions
Pin Name
SDI
Table 1. Pin Descriptions
DIG0:DIG7
GND
LD
N/C
I
SET
SCL
SEGA:SEGG,
SEGDP
VDD
SDO
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QSOP-24
1
TQFN(4x4)-24
22
2-5, 7-10
6
11
12
13
14
15-18,
20-23
19
24
-
21
Exposed Pad
Revision 1.08
SEGA
DIG6
DIG7
ISET
SCL
LD
10 11 12
Description
Serial-Data Input.
Data is loaded into the internal 16-bit shift register on the rising edge
of pin SCL.
1, 2, 4, 5, 7, 8, 23,
Digit Drive Lines.
Eight digit drive lines that sink current from the display cathode.
24
3
Ground.
Load.
Serial Data is loaded into the shift register while this pin is low. The last 16 bits of
9
serial data are latched on the rising edge of this pin.
6
Not Connected.
Set Segment Current.
Connect to V
DD
or a reference voltage through R
SET
to set the
peak segment current (see
Selecting RSET Resistor Value and Using
10
External Drivers on page 17).
Serial-Clock Input.
10MHz maximum rate. Data is shifted into the internal shift register
11
on the rising edge of this pin. Data is clocked out of pin SDO on the rising edge of this
pin.
Seven Segment and Decimal Point Drive Lines.
8 seven-segment drives and
12-15,
17-20
decimal point drive that source current to the display.
16
Positive Supply Voltage.
Connect to +2.7 to +5.5V supply.
Serial-Data Output.
The data into pin SDI is valid at pin SDO 16 clock cycles later. This
pin is used to daisy-chain several devices and is never high-impedance.
Exposed Pad.
This pin also functions as a heat sink. Solder it to a large pad or to the
circuit-board ground plane to maximize power dissipation.
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14
SEGB
13
SEGF
AS1116
DIG4
4
AS1116
16
VDD
15
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Datasheet - A b s o l u t e M a x i m u m R a t i n g s
5 Absolute Maximum Ratings
Stresses beyond those listed in
Table 2
may cause permanent damage to the device. These are stress ratings only, and functional operation of
the device at these or any other conditions beyond those indicated in
Section 6 Electrical Characteristics on page 4
is not implied.
Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Table 2. Absolute Maximum Ratings
Parameter
Electrical Parameters
V
DD
to GND
Input Voltage Range
All other pins to GND
DIG0:DIG7 Sink Current
SEGA:SEGG, SEGDP
±100
1000
-0.3
-0.3
7
7 or
V
DD
+ 0.3
500
100
V
V
mA
mA
mA
V
Min
Max
Units
Notes
Input Current (latch-up immunity)
Electrostatic Discharge
Electrostatic Discharge
Thermal Information
Digital outputs
All other pins
Temperature Ranges and Storage Conditions
Junction Temperature
Storage Temperature
Moisture Sensitive Level
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1000
88
V
Thermal Resistance
Θ
JA
ºC/W
30.5
ºC/W
°C
ºC
+150
+150
-55
Package Body Temperature
+260
ºC
Humidity non-condensing
5
85
%
QSOP-24 package
1
%
TQFN(4x4)-24 package
3
%
Revision 1.08
Norm: MIL 833 E method 3015
on PCB, QSOP-24 package
on PCB, TQFN(4x4)-24 package
The reflow peak soldering temperature (body
temperature) specified is in accordance with
IPC/JEDEC J-STD-020 “Moisture/Reflow
Sensitivity Classification for Non-Hermetic
Solid State Surface Mount Devices”.
The lead finish for Pb-free leaded packages
is matte tin (100% Sn).
Represents a max. floor life time of unlimited
Represents a max. floor life time 168h
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Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
6 Electrical Characteristics
V
DD
= 2.7 to 5.5V, R
SET
= 9.53k
Ω
,
Typical values are at
T
AMB
= +25°C,
V
DD
= 5.0V
(unless otherwise specified).
All limits are guaranteed. The
parameters with min and max values are guaranteed with production tests or SQC (Statistical Quality Control) methods.
Table 3. Electrical Characteristics
Symbol
T
AMB
T
J
V
DD
I
DDSD
Parameter
Operating Temperature Range
Operating Junction Temperature
Operating Supply Voltage
Shutdown Supply Current
All digital inputs at V
DD
or GND,
T
AMB
= +25ºC
R
SET
= open circuit.
I
DD
f
OSC
I
DIGIT
I
SEG
Operating Supply Current
Display Scan Rate
Digit Drive Sink Current
Segment Drive Source Current
All segments and decimal point on;
I
SEG
= -40mA.
8 digits scanned
V
OUT
= 0.65V
0.6
320
-37
Conditions
Min
-40
-40
2.7
0.2
0.35
335
0.8
Typ
Max
+85
+125
5.5
2
Unit
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Segment Drive Current Matching
Segment Drive Source Current
V
DD
= 5.0V, V
OUT
= (V
DD
-1V)
Average Current
-42
3
-47
47
Parameter
Input Current SDI, SCL, LD
Logic High Input Voltage
Logic Low Input Voltage
Conditions
V
IN
= 0V or V
DD
Min
-1
Typ
4.5V < V
DD
< 5.5V
V
DD
= 5.0V
0.6 x V
DD
2.7V < V
DD
< 4.5V
V
DD
= 3.0V
0.7 x V
DD
0.8
0.6
Output High Voltage
Output Low Voltage
Hysteresis Voltage
SDO, I
SOURCE
= -1mA,
V
DD
= 5.0V
V
DD
- 1
SDO, I
SOURCE
= -1mA,
V
DD
= 3.0V
SDO, I
SINK
= 1mA
SDI, SCL, LD
V
DD
- 0.5
0.4
Open Detection Level Threshold
Short Detection Level Threshold
0.7x
V
DD
0.05x V
DD
1
0.75x
V
DD
0.1x
V
DD
Revision 1.08
∆I
SEG
I
SEG
Table 4. Logic Inputs/Outputs Characteristics
Symbol
I
IH
, I
IL
V
IH
V
IL
V
OH
V
OL
∆V
I
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1.2
kHz
mA
mA
%
mA
Max
1
Unit
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V
V
V
V
V
V
V
0.8x
V
DD
0.15x
V
DD
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