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Da tas he et
A S11 06 , A S 11 0 7
8 -D ig it L E D D is p la y D r iv e r s
1 General Description
The AS1106 and the AS1107 are compact display drivers for 7-
segment numeric displays of up to 8 digits. The devices can be
programmed via SPI, QSPI, and Microwire as well as a conventional
4-wire serial interface.
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 LED settings, eliminating the
need for continuous device reprogramming.
Every segment can be individually addressed and updated
separately. Only one external resistor (R
SET
) is required to set the
current through the LED display. LED brightness can be controlled
by analog or digital means. The devices can be programmed to use
the internal code-B/HEX decoder to display numeric digits or to
directly address each segment.
The AS1106 and the AS1107 feature an extremely low shutdown
current of typically 3 A, and an operational current of less than
500 A. The number of digits can be programmed, the devices can
be reset by software, and an external clock is also supported.
Additionally, segment blinking can be synchronized across multiple
drivers.
Several test modes are available for easy application debugging.
The devices are available in a SOIC 24-pin package.
2 Key Features
10MHz SPI-, QSPI-, Microwire-Compatible Serial I/O
Individual LED Segment Control
Segment Blinking Control (can be synchronized across multiple
drivers)
Hexadecimal- or BCD-Code/No-Decode Digit Selection
3 A Low-Power Shutdown Current (typ; data retained)
Extremely Low Operating Current 0.5mA in Open-Loop
Digital and Analog Brightness Control
Display Blanked on Power-Up
Drive Common-Cathode LED Displays
Low-EMI Low Slew-Rate Limited Segment
Drivers (AS1107)
Supply Voltage Range: 2.7 to 5.5V
Software Reset
Optional External Clock
SOIC 24-pin Package
Figure 1. AS1106, AS1107 - Typical Application Diagram
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3 Applications
+5V
9.53kΩ
VDD
8 Digits
ISET
DIG0 to
DIG7
DIN
I/O
I/O
LOAD/CSN
CLK
The AS1106 and AS1107 are ideal for bar-graph displays,
instrument-panel meters, LED matrix displays, dot matrix displays,
set-top boxes, white goods, professional audio equipment, medical
equipment, industrial controllers and panel meters.
AS1106/
AS1107
8 Segments
SCK
Micro-
processor
SEG A to G
SEP DP
GND
GND
8-Digit Microprocessor Display
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Datasheet - P i n A s s i g n m e n t s
4 Pin Assignments
Figure 2. Pin Assignments (Top View)
DIN
DIG 0
DIG 4
GND
DIG 6
DIG 2
DIG 3
DIG 7
GND
1
2
3
4
24
23
22
21
DOUT
SEG D
SEG DP
SEG E
SEG C
VDD
ISET
SEG G
SEG B
SEG F
AS1106/
AS1107
5
6
7
8
9
20
19
18
17
16
15
14
13
4.1 Pin Descriptions
Table 1. Pin Descriptions
Pin Number
1
2, 3, 5, 6, 7, 8, 10,
11
4, 9
12
13
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21, 22, 23
18
19
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DIG 5
DIG 1
10
11
SEG A
CLK
LOAD/CSN
12
Pin Name
DIN
DIG 0:DIG 7
GND
LOAD/CSN
CLK
SEG A:SEG G, SEG DP
ISET
VDD
DOUT
Description
Serial-Data Input.
Data is loaded into the internal 16-bit shift register on the rising edge of
pin CLK.
Digit Drive Lines.
8 Eight-digit drive lines that sink current from the display common
cathode. The AS1106 pulls the digit outputs to V
DD
when turned off. The AS1107 digit drivers
are high-impedance when turned off.
Ground.
Both GND pins must be connected.
Load-Data Input
(AS1106 only). The last 16 bits of serial data are latched on the rising edge
of this pin.
Chip-Select Input
(AS1107 or AS1106 SPI-enabled only). Serial data is loaded into the shift
register while this pin is low. The last 16 bits of serial data are latched on the rising edge of
this pin.
Serial-Clock Input.
10MHz maximum rate. Data is shifted into the internal shift register on
the rising edge of this pin. Data is clocked out of pin DOUT on the falling edge of this pin. On
the AS1107 or AS1106 SPI-enabled, the CLK input is active only while LOAD/CSN is low.
Seven Segment and Decimal Point Drive Lines.
8 seven-segment drives and decimal
point drive that source current to the display. On the AS1106, when a segment driver is
turned off it is pulled to GND. The AS1107 segment drivers are high-impedance when turned
off.
Set Segment Current.
Connect to V
DD
through R
SET
to set the peak segment current (see
Selecting RSET Resistor Value and Using External Drivers on page 14).
Positive Supply Voltage.
Connect to +2.7 to +5.5V supply.
Serial-Data Output.
The data into pin DIN is valid at pin DOUT 16.5 clock cycles later. This
pin is used to daisy-chain several AS1106/AS1107 devices and is never high-impedance.
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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
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
VDD to GND
All other pins to GND
Current
DIG 0:DIG 7 Sink Current
SEG A:SEG G, SEG DP
Latch-Up Immunity
500
100
±200
mA
mA
mA
-0.3
-0.3
7
V
DD
+ 0.3
(max 7V)
V
V
Min
Max
Units
Notes
Electrostatic Discharge
Continuous Power Dissipation (TA = +85°C)
Wide SOIC
Temperature Ranges and Storage Conditions
Storage Temperature Range
Package Body Temperature (Wide SOIC)
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Digital outputs
All other pins
1000
V
1000
V
941
mW
Derate 11.8mW/ºC
above +70ºC
-55
+150
ºC
+260
ºC
Humidity
5
85
%
Non-condensing
Moisture Sensitive Level
3
Revision 2.29
All pins except AS1106 pin 14: ±180 mA
Norm: JEDEC 78
Norm: MIL 883 E method 3015
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 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
= 2.7V to 5.5V, R
SET
= 9.53kΩ±1%, T
AMB
= T
MIN
to T
MAX
(unless otherwise specified).
All limits are guaranteed. The
parameters with min and max values are guaranteed with production tests or SQC (Statistical Qualification Control)
methods.
Table 3. Electrical Characteristics
Symbol
T
AMB
V
DD
I
DDSD
Parameter
Operating Temperature Range
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
Segment Current Slew Rate
(AS1107 only)
Digit Drive Leakage
(AS1107 only)
All segments and decimal point on;
I
SEG
= -40mA.
8 digits scanned
V
OUT
= 0.65V
V
DD
= 5.0V, V
OUT
= (V
DD
-1V)
T
AMB
= +25ºC, V
DD
= 5.0V,
V
OUT
= (V
DD
-1V)
500
320
-30
10
330
Conditions
Min
-40
2.7
5.0
Typ
Max
+85
5.5
10
1
Unit
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20
-45
50
Segment Drive Current Matching
3.0
Digit off, V
DIGIT
= V
DD
-10
1
Segment Drive Leakage
(AS1107 only)
Segment off, V
SEG
= 0V
Digit Drive Source Current
(AS1106 only)
Digit off, V
DIGIT
= (V
DD
- 0.3V)
Segment off, V
SEG
= 0.3V
-2
5
Segment Drive Sink Current
(AS1106 only)
Slow Segment Blink Period (ON phase,
Internal Oscillator)
Fast Segment Blink Period
(ON phase, Internal Oscillator)
0.64
1
0.32
0.5
50
Fast or Slow Segment Blink Duty Cycle
(Guaranteed by design)
49.9
Parameter
Conditions
Min
-1
Typ
Input Current DIN, CLK, LOAD/CSN
Logic High Input Voltage
Logic Low Input Voltage
V
IN
= 0V or V
DD
1
0.7 x V
DD
V
DD
= 5.0V ± 10%
0.8
0.6
V
DD
= 3.0V ± 10%
Output High Voltage
Output Low Voltage
Hysteresis Voltage
DOUT, I
SOURCE
= -1mA,
V
DD
= 5.0V ± 10%
V
DD
- 1
DOUT, I
SOURCE
= -1mA,
V
DD
= 3.0V ± 10%
DOUT, I
SINK
= 1.6mA
DIN, CLK, LOAD/CSN
1
V
DD
- 0.5
0.4
Revision 2.29
∆I
SEG
/∆t
∆I
SEG
I
DIGIT
I
SEG
I
DIGIT
I
SEG
t
SLOWBLINK
t
FASTBLINK
Table 4. Logic Inputs/Outputs Characteristics
Symbol
I
IH
, I
IL
V
IH
V
IL
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OH
V
OL
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mA
mA/ s
%
A
A
mA
mA
s
s
%
1.65
0.83
50.1
Max
Unit
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V
V
V
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V
