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AS1106, AS1107

8-Digit LE D Display Driv e r s

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Datasheet

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 (RSET) 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 3µA, and an operational current of less than

500µA. 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.

Figure 1. AS1106, AS1107 - Typical Application Diagram

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

 3µA 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

3 Applications

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-Digit Microprocessor Display

DIG0 to

DIG7

SEG A to G

SEP DP

8 Digits

8 Segments

I/O

SCK

VDD

ISET

DIN

CLK

GND

LOAD/CSN

+5V

9.53kΩ

Micro-

processor

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AS1106, AS1107

Datasheet - P i n A s s ig n me nt s

4 Pin Assignments

Figure 2. Pin Assignments (Top View)

4.1 Pin Descriptions

Table 1. Pin Descriptions

Pin Number Pin Name Description

1DIN Serial-Data Input. Data is loaded into the internal 16-bit shift register on the rising edge of

pin CLK.

2, 3, 5, 6, 7, 8, 10,

11 DIG 0:DIG 7

Digit Drive Lines. 8 Eight-digit drive lines that sink current from the display common

cathode. The AS1106 pulls the digit outputs to VDD when turned off. The AS1107 digit drivers

are high-impedance when turned off.

4, 9 GND Ground. Both GND pins must be connected.

12 LOAD/CSN

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

this pin.

13 CLK

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.

14, 15, 16, 17, 20,

21, 22, 23 SEG A:SEG G, SEG DP

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.

18 ISET Set Segment Current. Connect to VDD through RSET to set the peak segment current (see

Selecting RSET Resistor Value and Using External Drivers on page 14).

19 VDD Positive Supply Voltage. Connect to +2.7 to +5.5V supply.

24 DOUT 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.

AS1106/

AS1107

DOUT

SEG D

SEG DP

SEG E

SEG C

VDD

ISET

SEG G

SEG B

SEG F

SEG A

CLK

DIN

DIG 0

DIG 4

GND

DIG 6

DIG 2

DIG 3

DIG 7

GND

DIG 5

DIG 1

LOAD/CSN

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Datasheet - A b s o l u t e M a x i m u m R a t in 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 Min Max Units Notes

Electrical Parameters

VDD to GND -0.3 7 V

All other pins to GND -0.3 VDD + 0.3

(max 7V) V

Current

DIG 0:DIG 7 Sink Current 500 mA

SEG A:SEG G, SEG DP 100 mA

Latch-Up Immunity ±200 mA All pins except AS1106 pin 14: ±180 mA

Norm: JEDEC 78

Electrostatic Discharge

Digital outputs 1000 V Norm: MIL 883 E method 3015

All other pins 1000 V

Continuous Power Dissipation (TA = +85°C)

Wide SOIC 941 mW Derate 11.8mW/ºC

above +70ºC

Temperature Ranges and Storage Conditions

Storage Temperature Range -55 +150 ºC

Package Body Temperature (Wide SOIC) +260 ºC

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).

Humidity 5 85 % Non-condensing

Moisture Sensitive Level 3 Represents a max. floor life time of 168h

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AS1106, AS1107

Datasheet - E l e c t r i ca l C h a r a c te r i s t i c s

6 Electrical Characteristics

VDD = 2.7V to 5.5V, RSET = 9.53kΩ±1%, TAMB = TMIN to TMAX (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 Parameter Conditions Min Typ Max Unit

TAMB Operating Temperature Range -40 +85 ºC

VDD Operating Supply Voltage 2.7 5.0 5.5 V

IDDSD Shutdown Supply Current All digital inputs at VDD or GND,

TAMB = +25ºC 10 µA

IDD Operating Supply Current

RSET = open circuit. 1 mA

All segments and decimal point on;

ISEG = -40mA. 330

fOSC Display Scan Rate 8 digits scanned 500 800 1300 Hz

IDIGIT Digit Drive Sink Current VOUT = 0.65V 320 mA

ISEG Segment Drive Source Current VDD = 5.0V, VOUT = (VDD -1V) -30 -40 -45 mA

∆ISEG/∆tSegment Current Slew Rate

(AS1107 only)

TAMB = +25ºC, VDD = 5.0V,

VOUT = (VDD -1V) 10 20 50 mA/µs

∆ISEG Segment Drive Current Matching 3.0 %

IDIGIT Digit Drive Leakage

(AS1107 only) Digit off, VDIGIT = VDD -10 µA

ISEG Segment Drive Leakage

(AS1107 only) Segment off, VSEG = 0V 1 µA

IDIGIT Digit Drive Source Current

(AS1106 only) Digit off, VDIGIT = (VDD - 0.3V) -2 mA

ISEG Segment Drive Sink Current

(AS1106 only) Segment off, VSEG = 0.3V 5 mA

tSLOWBLINK Slow Segment Blink Period (ON phase,

Internal Oscillator) 0.64 1 1.65 s

tFASTBLINK Fast Segment Blink Period

(ON phase, Internal Oscillator) 0.32 0.5 0.83 s

Fast or Slow Segment Blink Duty Cycle

(Guaranteed by design) 49.9 50 50.1 %

Table 4. Logic Inputs/Outputs Characteristics

Symbol Parameter Conditions Min Typ Max Unit

IIH, IIL Input Current DIN, CLK, LOAD/CSN VIN = 0V or VDD -1 1 µA

VIH Logic High Input Voltage 0.7 x VDD V

VIL Logic Low Input Voltage VDD = 5.0V ± 10% 0.8 V

VDD = 3.0V ± 10% 0.6

VOH Output High Voltage

DOUT, ISOURCE = -1mA,

VDD = 5.0V ± 10% VDD - 1

DOUT, ISOURCE = -1mA,

VDD = 3.0V ± 10% VDD - 0.5

VOL Output Low Voltage DOUT, ISINK = 1.6mA 0.4 V

∆VIHysteresis Voltage DIN, CLK, LOAD/CSN 1 V

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Datasheet - E l e c t r i ca l C h a r a c te r i s t i c s

Table 5. Timing Characteristics (see Figure 12 on page 8)

Symbol Parameter Conditions Min Typ Max Unit

tCP CLK Clock Period 100 ns

tCH CLK Pulse Width High 50 ns

tCL CLK Pulse Width Low 50 ns

tCSS CSM Fall to CLK Rise Setup Time

(AS1107 or AS1106 SPI-programmed) 25 ns

tCSH CLK Rise to LOAD/CSN Rise

Hold Time 0 ns

tDS DIN Setup Time 25 ns

tDH DIN Hold Time 0 ns

tDO Output Data Propagation Delay CLOAD = 50pF 25 ns

tLDCK LOAD Rising Edge to Next Clock Rising Edge

(AS1106 only) 50 ns

tCSW Minimum LOAD/CSN Pulse High 50 ns

tDSPD Data-to-Segment Delay 2.25 ms

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Datasheet - Ty p i c a l O p er a t i n g C h a r a c t e r is ti c s

7 Typical Operating Characteristics

VDD = 5V, RSET = 9.53kΩ, TAMB = 25ºC (unless otherwise specified).

Figure 3. Scan Frequency vs.Temperature Figure 4. Scan Frequency vs. VDD

Figure 5. ISEG vs. Temperature Figure 6. ISEG vs. VDD

900

910

920

930

940

950

960

970

980

23456

VDD (V)

FOSC (Hz)

930

940

950

960

970

980

990

-40 -20 0 20 40 60 80

TAMB [°C]

FOSC (Hz)

-40 -20 0 20 40 60 80

TAMB (°C)

ISEG (mA)

2 2.5 3 3.5 4 4.5 5 5.5 6

VDD (V)

ISEG (mA)

VDD = 5V, VOUT = 2.4V

VDD = 5V, VOUT = 4V

VDD = 2.7V, VOUT = 2V

VDD = 2.7V, VOUT = 2.4V

VOUT = 1.7V

VOUT = 2.4V

VOUT = 4V

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AS1106, AS1107

Datasheet - Ty p i c a l O p er a t i n g C h a r a c t e r is ti c s

Figure 7. AS1106 Segment Output Current Figure 8. AS1107 Segment Output Current

Figure 9. ISEG vs. VOUT Figure 10. ISEG vs. VOUT

Figure 11. ISEG vs. RSET

Intensity = 31/32 (0Fh)

0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0

Time (µs)

ISEG (mA)

Intensity = 15/16 (0Fh)

0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0

Time (µs)

ISEG (mA)

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

VOUT (V)

ISEG (mA)

VDD = 2.7V

0 0.5 1 1.5 2 2.5

VOUT (V)

ISEG (mA)

RSET = 10kΩ

RSET = 20kΩ

RSET = 40kΩ

RSET = 10kΩ

RSET = 20kΩ

0 10 20 30 40 50 60 70 80

RSET (kΩ)

ISEG (mA)

VOUT = 2.4V

VOUT

= 4V

VOUT = 2V

VOUT = 1.7V VDD = 2.7V

VDD = 5V

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AS1106, AS1107

Datasheet - D e ta i l e d D e s cr i pt io n

8 Detailed Description

8.1 AS1106 vs. AS1107

The AS1106 and AS1107 are identical except for two features:

 The AS1107 segment drivers are slew-rate limited to reduce electromagnetic interference (EMI).

 The AS1107 serial interface is fully SPI compatible (programmable for AS1106).

8.2 Serial-Addressing Format

Programming the AS1106/AS1107 is done by writing to the device’s internal registers (see Digit- and Control-Registers on page 9) via the 4-wire

serial interface. A programming sequence consists of 16-bit packages as listed in Table 6.

The data is shifted into the internal 16-bit register with the rising edge of the CLK signal. With the rising edge of the LOAD/CSN signal the data is

latched into a digit- or control-register. The LOAD/CSN signal must go high after the 16th rising clock edge.

The LOAD/CSN signal can also come later but this must happen just before the next rising edge of CLK, otherwise the data will be lost. The

contents of the internal shift register are applied 16.5 clock cycles later to pin DOUT. The data is clocked out at the falling edge of CLK.

The first 4 bits (D15:D12) are “don't care”, bits D11:D8 contain the register address, and bits D7:D0 contain the data. The first bit is D15, the most

significant bit (MSB). The exact timing is shown in Figure 12.

8.3 Initial Power-Up

On initial power-up, the AS1106/AS1107 registers are reset to their default values, the display is blanked, and the device goes into shutdown

mode. At this time, all registers should be programmed for normal operation.

Note: The default settings enable only scanning of one digit; the internal decoder is disabled and the Intensity Control Register (see page 12)

is set to the minimum values.

Figure 12. Interface Timing

Table 6. 16-Bit Serial Data Format

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

X X X X Register Address (see Table 7) MSB Data LSB

LOAD/CSN

CLK

DIN

DOUT

D15 D14 D1 D0

CSS

CSH

CSW

LDCK

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AS1106, AS1107

Datasheet - D e ta i l e d D e s cr i pt io n

8.4 Shutdown Mode

The AS1106/AS1107 devices feature a shutdown mode, where they consume only 10µA (max) current. Shutdown mode is entered via a write to

the Shutdown Register (see Table 8). For the AS1106, at that point, all segment current sources are pulled to ground and all digit drivers are

connected to VDD, so that all segments are blanked. The AS1107 behavior is identical except the drivers are high impedance.

Note: During shutdown mode the Digit-Registers maintain their data.

Shutdown mode can either be used as a means to reduce power consumption or for generating a flashing display (repeatedly entering and

leaving shutdown mode). For minimum supply current in shutdown mode, logic input should be at GND or VDD (CMOS logic level).

The devices need typically 250µs to exit shutdown mode, and during shutdown mode the AS1106/AS1107 is fully programmable. Only the

display test mode (see page 11) overrides shutdown mode.

When entering or leaving shutdown mode, the Feature Register is reset to its default values (all 0s) when Shutdown Register bit D7 (page 10) =

Note: If the AS1106/AS1107 is used with an external clock, Shutdown Register bit D7 should be set to 1 when writing to the Shutdown Regis-

ter.

8.5 Digit- and Control-Registers

The AS1106/AS1107 devices contain 8 Digit-Registers and 6 control-registers, which are listed in Table 7. All registers are selected using a 4-bit

address word, and communication is done via the serial interface.

 Digit Registers – These registers are realized with an on-chip 64-bit memory. Each digit can be controlled directly without rewriting the

whole register contents.

 Control Registers – These registers consist of decode mode, display intensity, number of scanned digits, shutdown, display test and fea-

tures selection registers.

1. When Shutdown Register bit D7 = 1, the Feature Register is left unchanged when entering or leaving shutdown mode.

Table 7. Register Address Map

D15:D12 D11 D10 D9 D8

No-Op 0xX0 X 0 0 0 0 13

Digit 0 0xX1 X 0 0 0 1 N/A

Digit 1 0xX2 X 0 0 1 0 N/A

Digit 2 0xX3 X 0 0 1 1 N/A

Digit 3 0xX4 X 0 1 0 0 N/A

Digit 4 0xX5 X 0 1 0 1 N/A

Digit 5 0xX6 X 0 1 1 0 N/A

Digit 6 0xX7 X 0 1 1 1 N/A

Digit 7 0xX8 X 1 0 0 0 N/A

Decode-Mode 0xX9 X 1 0 0 1 10

Intensity Control 0xXA X 1 0 1 0 12

Scan Limit 0xXB X 1 0 1 1 12

Shutdown 0xXC X 1 1 0 0 10

N/A 0xXD X 1 1 0 1 N/A

Feature 0xXE X 1 1 1 0 13

Display Test 0xXF X 1 1 1 1 11

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Datasheet - D e ta i l e d D e s cr i pt io n

8.5.1 Shutdown Register (0xXC)

The Shutdown Register controls AS1106/AS1107 shutdown mode (see Shutdown Mode on page 9).

8.5.2 Decode Enable Register (0xX9)

The Decode Enable Register sets the decode mode. BCD/HEX decoding (either BCD code – characters 0:9, E, H, L, P, and -, or HEX code –

characters 0:9 and A:F) is selected by bit D2 (page 13) of the Feature Register. The Decode Enable Register is used to select the decode mode

or no-decode for each digit. Each bit in the Decode Enable Register corresponds to its respective display digit (i.e., bit D0 corresponds to digit 0,

bit D1 corresponds to digit 1 and so on). Table 10 lists some examples of the possible settings for the Decode Enable Register bits.

Note: A logic high enables decoding and a logic low bypasses the decoder altogether.

When decode mode is used, the decoder looks only at the lower-nibble (bits D3:D0) of the data in the Digit-Registers, disregarding bits D6:D4.

Bit D7 sets the decimal point (SEG DP) independent of the decoder and is positive logic (bit D7 = 1 turns the decimal point on). Table 10 lists the

code-B font; Table 11 lists the HEX font.

When no-decode mode is selected, data bits D7:D0 of the Digit-Registers correspond to the segment lines of the AS1106/AS1107. Table 12

shows the 1:1 pairing of each data bit to the appropriate segment line.

Figure 13. Standard 7-Segment LED Intensity Control and Inter-Digit Blanking

Table 8. Shutdown Register Format (Address (HEX) = 0xXC))

Mode HEX Code Register Data

D7 D6 D5 D4 D3 D2 D1 D0

Shutdown Mode,

Reset Feature Register to Default Settings 0x00 0 X X X X X X 0

Shutdown Mode, Feature Register Unchanged 0x80 1 X X X X X X 0

Normal Operation,

Reset Feature Register to Default Settings 0x01 0 X X X X X X 1

Normal Operation, Feature Register Unchanged 0x81 1 X X X X X X 1

Table 9. Decode Enable Register Format (Address (HEX) = 0xX9))

Decode Mode HEX Code Register Data

D7 D6 D5 D4 D3 D2 D1 D0

No decode for digits 7:0 0x00 0 0 0 0 0 0 0 0

Code-B/HEX decode for digit 0. No decode for digits 7:1 0x01 0 0 0 0 0 0 0 1

Code-B/HEX decode for digits 3:0. No decode for digits 7:4 0x0F 0 0 0 0 1 1 1 1

Code-B/HEX decode for digits 7:0 0xFF 1 1 1 1 1 1 1 1

Table 10. Code-B Font

7-Segment Character

†

D6:D4

†

0 X 0000 1111110

1 X 0001 0110000

2 X 0010 1101101

3 X 0011 1111001

4 X 0100 0110011

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8.5.3 Display-Test Register (0xXF)

The AS1106/AS1107 devices can operate in two modes: normal mode and display test mode. In display test mode all LEDs are switched on at

maximum brightness (duty cycle is 15/16 (AS1106) or 31/32 (AS1107). The devices remain in display-test mode until the Display-Test Register is

set for normal operation.

Note: All settings of the digit- and control-registers are maintained.

5 X 0101 1011011

6 X 0110 1011111

7 X 0111 1110000

8 X 1000 1111111

9 X 1001 1111011

- X 1010 0000001

E X 1011 1001111

H X 1100 0110111

L X 1101 0001110

P X 1110 1100111

Blank X 1 1 1 1 0 0 0 0 0 0 0

†

The decimal point is enabled by setting bit D7 = 1.

Table 11. HEX Font

7-Segment Character

†

D6:D4

†

0 X 0 0 0 0 1 1 1 1 1 1 0

1 X 0 0 0 1 0 1 1 0 0 0 0

2 X 0 0 1 0 1 1 0 1 1 0 1

3 X 0 0 1 1 1 1 1 1 0 0 1

4 X 0 1 0 0 0 1 1 0 0 1 1

5 X 0 1 0 1 1 0 1 1 0 1 1

6 X 0 1 1 0 1 0 1 1 1 1 1

7 X 0 1 1 1 1 1 1 0 0 0 0

8 X 1 0 0 0 1 1 1 1 1 1 1

9 X 1 0 0 1 1 1 1 1 0 1 1

A X 1 0 1 0 1 1 1 0 1 1 1

b X 1 0 1 1 0 0 1 1 1 1 1

C X 1 1 0 0 1 0 0 1 1 1 0

d X 1 1 0 1 0 1 1 1 1 0 1

E X 1 1 1 0 1 0 0 1 1 1 1

F X 1 1 1 1 1 0 0 0 1 1 1

†

The decimal point is enabled by setting bit D7 = 1.

Table 12. No-Decode Mode Data Bits and Corresponding Segment Lines

D7 D6 D5 D4 D3 D2 D1 D0

Corresponding Segment Line DP A B C D E F G

Table 13. Display-Test Register Format (Address (HEX) = 0xXF))

Mode Register Data

D7 D6 D5 D4 D3 D2 D1 D0

Normal Operation X X X X X X X 0

Display Test Mode X X X X X X X 1

Table 10. Code-B Font (Continued)

7-Segment Character

†

D6:D4

†

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Datasheet - D e ta i l e d D e s cr i pt io n

8.5.4 Intensity Control Register (0xXA)

The brightness of the display can be controlled by digital means using the Intensity Control Register and by analog means using RSET (see

Selecting RSET Resistor Value and Using External Drivers on page 14).

Display brightness is controlled by an integrated pulse-width modulator which is controlled by the lower-nibble of the Intensity Control Register.

The modulator scales the average segment-current in 16 steps from a maximum of 31/32 down to 1/32 (15/16 to 1/16 for the AS1107) of the

peak current set by RSET.

8.5.5 Scan-Limit Register (0x0B)

The Scan-Limit Register controls which of the digits are to be displayed. When all 8 digits are to be displayed, the update frequency is typically

800Hz. If the number of digits displayed is reduced, the update frequency is increased. The frequency can be calculated using 8fOSC/N, where

N is the number of digits. Since the number of displayed digits influences the brightness, RSET should be adjusted accordingly. Table 16 lists the

maximum allowed current when fewer than 4 digits are used.

Note: To avoid differences in brightness this register should not be used to blank parts of the display (leading zeros).

Table 14. Intensity Register Format (Address (HEX) = 0xXA))

Duty Cycle HEX Code Register Data

AS1106 AS1107 D7 D6 D5 D4 D3 D2 D1 D0

1/32 (min on) 1/16 (min on) 0xX0 X X X X 0 0 0 0

3/32 2/16 0xX1 X X X X 0 0 0 1

5/32 3/16 0xX2 X X X X 0 0 1 0

7/32 4/16 0xX3 X X X X 0 0 1 1

9/32 5/16 0xX4 X X X X 0 1 0 0

11/32 6/16 0xX5 X X X X 0 1 0 1

13/32 7/16 0xX6 X X X X 0 1 1 0

15/32 8/16 0xX7 X X X X 0 1 1 1

17/32 9/16 0xX8 X X X X 1 0 0 0

19/32 10/16 0xX9 X X X X 1 0 0 1

21/32 11/16 0xXA X X X X 1 0 1 0

23/32 12/16 0xXB X X X X 1 0 1 1

25/32 13/16 0xXC X X X X 1 1 0 0

27/32 14/16 0xXD X X X X 1 1 0 1

29/32 15/16 0xXE X X X X 1 1 1 0

31/32 (max on) 15/16 (max on) 0xXF X X X X 1 1 1 1

Table 15. Scan-Limit Register Format (Address (HEX) = 0xXB))

Scan Limit HEX Code Register Data

D7 D6 D5 D4 D3 D2 D1 D0

Display digit 0 only (see Table 16) 0xX0 X X X X X 0 0 0

Display digits 0:1 (see Table 16) 0xX1 X X X X X 0 0 1

Display digits 0:2 (see Table 16) 0xX2 X X X X X 0 1 0

Display digits 0:3 0xX3 X X X X X 0 1 1

Display digits 0:4 0xX4 X X X X X 1 0 0

Display digits 0:5 0xX5 X X X X X 1 0 1

Display digits 0:6 0xX6 X X X X X 1 1 0

Display digits 0:7 0xX7 X X X X X 1 1 1

Table 16. Maximum Segment Current for 1-, 2-, or 3-Digit Displays

Number of Digits Displayed Maximum Segment Current (mA)

1 10

2 20

3 30

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AS1106, AS1107

Datasheet - D e ta i l e d D e s cr i pt io n

8.5.6 Feature Register (0xXE)

The Feature Register is used for enabling various features including switching the device into external clock mode, applying an external reset,

selecting code-B or HEX decoding, enabling or disabling blinking, enabling or disabling the SPI-compatible interface (AS1106 only), setting the

blinking rate, and resetting the blink timing.

Note: At power-up the Feature Register is initialized to 0.

8.5.7 No-Op Register (0xX0)

The No-Op Register is used when multiple AS1106 or AS1107 devices are cascaded in order to support displays with more than 8 digits. The

cascading must be done in such a way that all DOUT pins are connected to DIN of the next AS1106/AS1107 (see Figure 14 on page 16). The

LOAD/CSN and CLK signals are connected to all devices.

For example, if five devices are cascaded, in order to perform a write operation to the fifth device, the write-command must be followed by four

no-operation commands. When the LOAD/CSN signal goes high, all shift registers are latched. The first four devices will receive no-operation

commands and only the fifth device will receive the intended operation command, and subsequently update its register.

Table 17. Feature Register Summary

D7 D6 D5 D4 D3 D2 D1 D0

blink_

start sync blink_

freq_sel blink_en spi_en decode_sel reg_res clk_en

Table 18. Feature Register Bit Descriptions (Address (HEX) = 0xXE))

Addr: 0xXE Feature Register

Enables and disables various device features.

Bit Bit Name Default Access Bit Description

D0 clk_en 0 R/W

External clock active.

0 = Internal oscillator is used for system clock.

1 = Pin CLK of the serial interface operates as system clock input.

D1 reg_res 0 R/W

Resets all control registers except the Feature Register.

0 = Reset Disabled. Normal operation.

1 = All control registers are reset to default state (except the Feature Register)

identically after power-up.

Note: The Digit Registers maintain their data.

D2 decode_sel 0 R/W

Selects display decoding.

0 = Enable Code-B decoding (see Table 10 on page 10).

1 = Enable HEX decoding (see Table 11 on page 11).

D3 spi_en 0 R/W

Enables the SPI-compatible interface.

0 = Disable SPI-compatible interface (AS1106 only).

1 = Enable the SPI-compatible interface (AS1106 only).

Note: The SPI-compatible interface is always enabled in the AS1107.

D4 blink_en 0 R/W

Enables blinking.

0 = Disable blinking.

1 = Enable blinking.

D5 blink_freq_sel 0 R/W

Sets blink with low frequency (with the internal oscillator enabled):

0 = Blink period typically is 1 second (0.5s on, 0.5s off).

1 = Blink period is 2 seconds (1s on, 1s off).

D6 sync 0 R/W

Synchronizes blinking on the rising edge of pin LOAD/CSN. The multiplex and blink

timing counter is cleared on the rising edge of pin LOAD/CSN. By setting this bit in

multiple AS1106/AS1107 devices, the blink timing can be synchronized across all the

devices.

D7 blink_start 0 R/W

Start Blinking with display enabled phase. When bit D4 (blink_en) is set, bit D7

determines how blinking starts.

0 = Blinking starts with the display turned off.

1 = Blinking starts with the display turned on.

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Datasheet - A p p l i c a t i o n In f o r m a t i o n

9 Application Information

9.1 Supply Bypassing and Wiring

In order to achieve optimal performance the AS1106/AS1107 should be placed very close to the LED display to minimize effects of

electromagnetic interference and wiring inductance.

Furthermore, it is recommended to connect a 10µF electrolytic and a 0.1µF ceramic capacitor between pins VDD and GND to avoid power

supply ripple (see Figure 14 on page 16).

Note: Both GND pins must be connected to ground.

9.2 Selecting RSET Resistor Value and Using External Drivers

Brightness of the display segments is controlled via RSET. The current that flows between VDD and ISET defines the current that flows through

the LEDs.

Segment current is about 200 times the current in ISET. Typical values for RSET for different segment currents, operating voltages, and LED

voltage drop (VLED) are given in Tables 19 - 23. The maximum current the AS1106/AS1107 devices can drive is 40mA. If higher currents are

needed, external drivers must be used, in which case it is no longer necessary that the devices drive high currents.

In cases where the devices only drive a few digits, Table 16 specifies the maximum currents, and RSET must be set accordingly.

Note: The display brightness can also be logically controlled (see Intensity Control Register (0xXA) on page 12).

Table 19. RSET vs. Segment Current and LED Forward Voltage, VDD = 2.7V

ISEG (mA) VLED(V)

1.5 2.0

40 5kΩ4.4kΩ

30 6.9kΩ5.9kΩ

20 10.7kΩ9.6kΩ

10 22.2kΩ20.7kΩ

Table 20. RSET vs. Segment Current and LED Forward Voltage, VDD = 3.3V

ISEG (mA) VLED(V)

1.5 2.0 2.5

40 6.7kΩ6.4kΩ5.7kΩ

30 9.1kΩ8.8kΩ8.1kΩ

20 13.9kΩ13.3kΩ12.6kΩ

10 28.8kΩ27.7kΩ26kΩ

Table 21. RSET vs. Segment Current and LED Forward Voltage, VDD = 3.6V

ISEG (mA) VLED(V)

1.5 2.0 2.5 3.0

40 7.5kΩ7.2kΩ6.6kΩ5.5kΩ

30 10.18kΩ9.8kΩ9.2kΩ7.5kΩ

20 15.6kΩ15kΩ14.3kΩ13kΩ

10 31.9kΩ31kΩ29.5kΩ27.3kΩ

Table 22. RSET vs. Segment Current and LED Forward Voltage, VDD = 4.0V

ISEG (mA) VLED(V)

1.5 2.0 2.5 3.0 3.5

40 8.6kΩ8.3kΩ7.9kΩ7.6kΩ5.2kΩ

30 11.6kΩ11.2kΩ10.8kΩ9.9kΩ7.8kΩ

20 17.7kΩ17.3kΩ16.6kΩ15.6kΩ13.6kΩ

10 36.89kΩ35.7kΩ34.5kΩ32.5kΩ29.1kΩ

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Datasheet - A p p l i c a t i o n In f o r m a t i o n

9.3 Calculating the Power Dissipation

The upper limit for power dissipation (PD) for the AS1106/AS1107 is determined from the following equation:

PD = (VDD x 1mA) + (VDD - VLED)(DUTY x ISEG x N) (EQ 1)

Where:

VDD is the supply voltage.

DUTY is the duty cycle set by intensity register (page 12).

N is the number of segments driven (worst case is 8)

VLED is the LED forward voltage

ISEG = segment current set by RSET

Dissipation Example:

ISEG = 40mA, N = 8, DUTY = 31/32, VLED = 1.8V at 40mA, VDD = 5.25V (EQ 2)

PD = 5.25V(1mA) + (5.25V - 1.8V)(31/32 x 40mA x 8) = 1.075W (EQ 3)

Thus, for a PDIP package ΘJA = +75°C/W (from Table 24), the maximum allowed TAMB is given by:

TJ,MAX = TAMB + PD x

JA = 150°C = TAMB +1.07W x 75°C/W (EQ 4)

Where:

TAMB = +69.4°C.

The TAMB limit for SO Packages in the dissipation example above is +58.6°C.

Table 23. RSET vs. Segment Current and LED Forward Voltage, VDD = 5.0V

ISEG (mA) VLED (V)

1.5 2.0 2.5 3.0 3.5 4.0

40 11.35kΩ11.12kΩ10.84kΩ10.49kΩ10.2kΩ9.9kΩ

30 15.4kΩ15.1kΩ14.7kΩ14.4kΩ13.6kΩ13.1kΩ

20 23.6kΩ23.1kΩ22.6kΩ22kΩ21.1kΩ20.2kΩ

10 48.9kΩ47.8kΩ46.9kΩ45.4kΩ43.8kΩ42kΩ

Table 24. Package Thermal Data

Package Thermal Resistance (ΘJA)

24 Wide SOIC +85°C/W

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9.4 8x8 LED Dot Matrix Driver

The application example in Figure 14 shows the AS1106 as an 8x8 LED dot matrix driver.

The LED columns have common cathodes and are connected to the DIG0:7 outputs. The rows are connected to the segment drivers. Each of

the 64 LEDs can be addressed separately. The columns are selected via the digits as listed in Table 7 on page 9.

The Decode Enable Register (see page 10) must be set to ‘00000000’ as described in Table 9 on page 10. Single LEDs in a column can be

addressed as described in Table 12 on page 11, where bit D0 corresponds to segment G and bit D7 corresponds to segment DP.

Note: For a multiple-digit dot matrix, multiple AS1106 devices must be cascaded.

Figure 14. Application Example as LED Dot Matrix Driver

9.5 Cascading Drivers

The example in Figure 14 drives 2 dot matrix digits using a 4-wire microprocessor interface. All Scan-Limit Registers should be set to the same

value so that one display will not appear brighter than the other.

For example, to display 12 digits, set both Scan-Limit Registers to display 6 digits so that both displays have a 1/6 duty cycle per digit. If 11 digits

are needed, set both Scan-Limit Registers to display 6 digits and leave one digit unconnected. Otherwise, if one driver is set to display 6 digits

and the other to display 5 digits

one display will appear brighter because its duty cycle per digit will be 1/5 and the other display’s duty cycle will

be 1/6.

Note:

Refer to No-Op Register (0xX0) on page 13 for additional information.

SEG G

DIG0:7

ISET

DIN

GND

LOAD/CSN

CLK

VDD

SEG A:G

SEG DP

9.53kΩ

DIG0:7

ISET

DIN

GND

LOAD/CSN

CLK

VDD

SEG A:G

SEG DP

9.53kΩ

DOUT

8x8 LED Dot Matrix 8x8 LED Dot Matrix

Diode Arrangement

VBATVBAT

Micro-

Processor

SEG A

SEG DP

SEG B

SEG C

SEG D

SEG E

SEG F

SEG G

SEG A

SEG DP

SEG B

SEG C

SEG D

SEG E

SEG F

AS1106/

AS1107

AS1106/

AS1107

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Datasheet - P a c k a ge D r a w i n g s a n d M a r k i n g s

10 Package Drawings and Markings

Figure 15. AS1106, AS1107 Marking

Table 25. Packaging Code

YY WW Q ZZ

last two digits of the current year manufacturing week plant identifier free choice / traceability code

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Datasheet - P a c k a ge D r a w i n g s a n d M a r k i n g s

Figure 16. SOIC 24-pin Package

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Datasheet - O r d e r i n g I n f o r m a t i o n

11 Ordering Information

The AS1106 and AS1107 are available as the standard products shown in Table 26.

Note:

All products are RoHS compliant and austriamicrosystems green.

Buy our products or get free samples online at ICdirect: http://www.austriamicrosystems.com/ICdirect

Technical Support is found at http://www.austriamicrosystems.com/Technical-Support

For further information and requests, please contact us mailto:sales@austriamicrosystems.com

or find your local distributor at http://www.austriamicrosystems.com/distributor

Table 26. Ordering Information

Ordering Code Marking Description Temperature Range Delivery Form Package

AS1106WL AS1106WL 8-Digit LED Display Drivers 0 to +70°C Tubes SOIC 24-pin

AS1106WL-T AS1106WL 8-Digit LED Display Drivers 0 to +70°C Tape and Reel SOIC 24-pin

AS1106WE AS1106WE 8-Digit LED Display Drivers -40 to +85°C Tubes SOIC 24-pin

AS1106WE-T AS1106WE 8-Digit LED Display Drivers -40 to +85°C Tape and Reel SOIC 24-pin

AS1107WL AS1107WL 8-Digit LED Display Drivers -40 to +85°C Tubes SOIC 24-pin

AS1107WL-T AS1107WL 8-Digit LED Display Drivers -40 to +85°C Tape and Reel SOIC 24-pin

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Datasheet

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any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for

current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range,

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