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D a ta s h e e t
AS1117
64 LED Driver for Mobile Applications with Error Detection
1 General Description
The AS1117 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 controlled 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.
Table 1. Available Products
Devices
AS1115
AS1116
AS1117
AS1118
2 Key Features
!
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3.4MHz I²C-Compatible Interface
Readback for 8 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
RESET Input
no
Additionally the AS1117 offers a detailed error diagnostic
mode for easy and fast production testing in critical
applications. The AS1117 features a low shutdown cur-
rent of typically 200nA, and an operational current of
typically 350µA. The number of digits can be pro-
grammed, the devices can be reset by software, and an
external clock is also supported.
The device is available in a TQFN(4x4)-24 package.
Figure 1.
AS1117 -
Typical Application Diagram
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V
DD
2.7V to 5.5V
9.53kΩ
Te
SDA
SCL
IRQ
µP
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Drive Common-Cathode LED Displays
Supply Voltage Range: 2.7V to 5.5V
Software and Hardware Reset
Up to 4 devices cascadable
Optional External Clock
Package: TQFN(4x4)-24
Interfaces
I²C
no
SPI
I²C
yes
yes
SPI
3 Applications
The AS1117 is ideal for seven-segment or dot matrix
user interface displays of mobile applications, set-top
boxes, VCRs, DVD-players, washing machines, micro
wave ovens, refrigerators and other white good or per-
sonal electronic applications.
VDD
DIG0 to
DIG7
SEGA-DP
KEY0-7
8
I
SET
8
SDA
SCL
IRQ
RESETN
AS1117
KEY
GND
Revision 1.00
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Individual LED Segment Control
AS1117
Datasheet - P i n o u t
4 Pinout
Pin Assignments
Figure 2. Pin Assignments (Top View)
SEGD
SEGDP
DIG1
DIG0
SDA
IRQ
24 23 22 21 20 19
DIG2
1
DIG3
2
GND
3
DIG4
4
DIG5
5
DIG6
6
18
SEG E
17
SEGC
Pin Descriptions
Pin Name
SDA
DIG0:DIG7
GND
KEY
RESETN
Table 2. Pin Descriptions
Pin Number
22
1, 2, 4, 5, 6, 7,
23, 24
3
8
9
I
SET
SCL
IRQ
SEGA:SEGG,
SEGDP
V
DD
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16
Exposed Pad
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Exposed
Pad
AS1117
16
VDD
15
SEGG
14
SEGB
13
SEGF
7
8
9
10 11 12
RESETN
10
11
21
Description
Serial-Data I/O.
Open drain digital I/O I²C data pin.
Digit Drive Lines.
Eight digit drive lines that sink current from the display
common cathode. Keyscan detection optional, but must be polled by the
µProzessor.
Ground.
Keyscan Input.
Keyscan lines for key readback. Can be used for self-adressing.
Reset Input.
Pull this pin to low to resest all registers (set to default values) and
to put the device into shutdown. Connect this pin via a pull-up resistor to V
DD
for
normal operation.
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
External Drivers on page 19).
Serial-Clock Input.
3.4MHz maximum rate.
Interupt Request Output.
Open drain pin.
Seven Segment and Decimal Point Drive Lines.
8 seven-segment drives and
decimal point drive that source current to the display.
Positive Supply Voltage.
Connect to +2.7V to +5.5V supply. Bypass this pin to
GND with a 0.1µF capacitor to avoid power supply ripple.
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.
Revision 1.00
SEGA
DIG7
KEY
SCL
I
SET
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AS1117
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 3
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 3. Absolute Maximum Ratings
V
DD
to GND
Input Voltage Range
All other pins to GND
DIG0:DIG7 Sink Current
SEGA:SEGG, SEGDP
Digital outputs
All other pins
Humidity
ESD
-0.3
-0.3
7
7 or
V
DD
+ 0.3
500
100
85
V
V
mA
mA
%
Latch-Up Immunity
Thermal Resistance
Θ
JA
Ambient Temperature
Storage Temperature
Package Body Temperature
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5
Non-condensing
1
kV
Norm: MIL 833 E method 3015
EIA/JESD78
on PCB
±100
mA
ºC
ºC
30.5
+85
150
ºC/W
-40
-55
+260
ºC
Revision 1.00
Current
The reflow peak soldering
temperature (body temperature)
specified is in accordance with
IPC/
JEDEC J-STD-020D “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).
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Parameter
Min
Max
Units
Notes
AS1117
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
= 2.7V to 5.5V, R
SET
= 9.53kΩ, T
AMB
= -40°C to +85°C, typ. values @ T
AMB
= +25ºC and V
DD
= 5.0V
(unless oth-
erwise specified).
Table 4. Electrical Characteristics
Symbol
V
DD
I
DDSD
Parameter
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
ΔI
SEG
I
SEG
Operating Supply Current
Display Scan Rate
All segments and decimal
point on; I
SEG
= -40mA.
8 digits scanned
0.48
320
-35
V
OUT
= 0.65V
Conditions
Min
2.7
0.2
0.35
335
Typ
Max
5.5
2
Unit
V
µA
Digit Drive Sink Current
Segment Drive Source Current
Segment Drive Current Matching
Segment Drive Source Current
Table 5. Logic Inputs/Outputs Characteristics
Symbol
I
IH
, I
IL
V
IH
V
IL
V
OL(SDA)
V
KEYopen
V
KEYshort
V
OL(IRQ)
ΔV
I
Parameter
Input Current SDA, SCL
Logic High Input Voltage
SDA, SCL, RESETN
Logic Low Input Voltage
SDA, SCL, RESETN
SDA Output Low Voltage
Keyscan Open Input Voltage
Keyscan Short Input Voltage
Interrupt Output Low Voltage
I
SINK
= 3mA
Hysteresis Voltage
DIN, CLK, LD/CS
Capacitive Load for Each Bus Line
Open Detection Level Threshold
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0.96
-47
47
mA
%
V
DD
= 5.0V, V
OUT
= (V
DD
-1V)
-41
3
mA
Average Current
mA
Conditions
V
IN
= 0V or V
DD
Min
-1
Typ
Max
1
1.26
V
0.54
0.4
V
I
SINK
= 3mA
0.8xV
DD
V
V
0.7x V
DD
0.4
1
V
V
V
0.7x
V
DD
0.05x
V
DD
400
0.75x
V
DD
0.1x
V
DD
pF
V
V
0.8x
V
DD
0.15x
V
DD
Revision 1.00
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kHz
Unit
µA
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