high performance needs great design. AS1105 Serially interfaced 4-digit LED driver datasheet Please be patient while we update our brand image as austriamicrosystems and TAOS are now ams. www.ams.com A S 110 5 Serially Interfaced, 4-Digit LED Driver 1 General Description 2 Key Features Cost effective version of AS1100 functionality for applications The AS1105 is an LED driver for 7-segment numeric displays of up to 4 digits. The AS1105 can be programmed via a conventional 4wire serial interface. up to 4-Digits 10MHz Serial Interface The device includes a BCD code-B decoder, a multiplex scan circuitry, segment and display drivers, and a 32-bit memory. The memory is used to store the LED settings, so that continuous reprogramming is not necessary. Individual LED Segment Control Decode/No-Decode Digit Selection 20A Low-Power Shutdown (Data Retained) Every individual segment can be addressed and updated separately. Only one external resistor is required to set the current through the LED display. Extremely low Operating Current 0.5mA in open loop Brightness can be controlled either in an analog or digital way. The user can choose the internal code-B decoder to display numeric digits or to address each segment directly. Display Blanked on Power-Up Digital and Analog Brightness Control Drive Common-Cathode LED Display Software Reset The AS1105 features an extremely low shutdown current of only 20A and an operational current of less than 500A. The number of visible digits can be programmed as well. Optional External clock 20-pin SOIC Package The AS1105 can be reset by software and an external clock can be used. Several test modes support easy debugging. 3 Applications AS1105 is offered in a 20-pin SOIC package. The AS1105 is an ideal solution for Bar-Graph Displays, Industrial Controllers, Panel Meters, LED Matrix Displays and White Goods such as washing machines, dishwasher, etc. Figure 1. AS1105 - Typical Application Circuit +5V VDD 9.53k ISET DIFG0-DIG3 4 Digits MOSI P I/O SCK DIN AS1105 LOAD CLK GND SEG A-G SEP DP 8 Segments GND 4-Digit P Display www.ams.com/LED-Driver-ICs/AS1105 Revision 1.36 1 - 15 AS1105 Datasheet - P i n A s s i g n m e n t s 4 Pin Assignments Figure 2. Pin Configuration (Top View) DOUT 1 20 SEG D DIN 2 19 SEG DP DIG0 3 18 SEG E GND 4 17 SEG C DIG2 5 16 VDD DIG3 6 15 ISET AS1105 GND 7 14 SEG G DIG1 8 13 SEG B LOAD 9 12 SEG F CLK 10 11 SEG A SO 4.1 Pin Descriptions Table 1. Pin Descriptions Pin Number Pin Name Description 1 DOUT Serial data output for cascading drivers. The output is valid after 16.5 clock cycles. The output is never set to high impedance. 2 DIN 3,8,5,6 DIG0 : DIG3 4,7 GND Both GND pins must be connected. 9 LOAD Strobe input. With the rising edge of the LOAD signal the 16-bit of serial data is latched into the register. 10 CLK 11:14, 17:20 SEGA:G, DP 15 ISET The current into ISET determines the peak current through the segments and therefore the brightness. 16 VDD Positive Supply Voltage (+5V) www.ams.com/LED-Driver-ICs/AS1105 Data input. Data is programmed into the 16-bit shift register on the rising CLK edge. 4-digit driver lines that sink the current from the common cathode of the display. In shutdown mode the AS1105 switches the outputs to VDD. Clock input. The interface is capable to support clock frequencies up to 10MHz. The serial data is clocked into the internal shift register with the rising edge of the CLK signal. On the DOUT pin the data is applied with the falling edge of CLK. Seven segment driver lines including the decimal point. When a segment is turned off the output is connected to GND. Revision 1.36 2 - 15 AS1105 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 Table 2. Absolute Maximum Ratings Parameter Min Max Units VDD to GND -0.3 +6 V DIN, CLK, LOAD to GND -0.3 +6 V All Other pins to GND -0.3 VDD + 0.3 V Notes Current DIG0-DIG3 Sink Current 500 mA SEGA-G, DP Source Current 100 mA 941 mW Continuous Power Dissipation (TA = +85C) Wide SO Operating Temperature Range -40 +85 C Storage Temperature Range -65 +150 C Package body temperature Moisture Sensitivity Level www.ams.com/LED-Driver-ICs/AS1105 +260 3 C Derate 11.8mW/C above +70C The reflow peak soldering temperature (body temperature) is specified according IPC/JEDEC J-STD-020D "Moisture/Reflow Sensitivity Classification for non-hermetic Solid State Surface Mount Devices". Represents a maximum floor life of 168h Revision 1.36 3 - 15 AS1105 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 VDD = 5V, RSET = 9.53k1%, TA = TMIN to TMAX, unless otherwise noted. Table 3. Electrical Characteristics Symbol Parameter Conditions Min Typ Max Units VDD Operating Supply Voltage 4.0 5.0 5.5 V IDDSD Shutdown Supply Current 20 50 A IDD Operating Supply Current 500 A fOSC Display Scan Rate IDIGIT Digit Drive Sink Current VOUT = 0.65V 320 ISEG Segment Drive Source Current TA = +25C, VOUT = (VDD -1V) -30 ISEG Segment Drive Current Matching IDIGIT Digit Drive Source Current Digit off, VDIGIT = (VDD -0.3V) -2 mA ISEG Segment Drive Sink Current Segment off, VSEG = 0.3V 5 mA IIH, IIL Input Current DIN, CLK, LOAD VIN = 0V or VDD -1 VIH Logic High Input Voltage VIL Logic Low Input Voltage VOH Output High Voltage DOUT, ISOURCE = -1mA VOL Output Low Voltage DOUT, ISINK = 1.6mA Hysteresis Voltage DIN, CLK, LOAD All digital inputs at VDD or GND, TA = +25C RSET = open circuit All segments and decimal point on, ISEG = -40mA 330 500 800 mA 1300 Hz mA -40 -45 3.0 mA % Logic Inputs 1 3.5 A V 0.8 VDD - 1 V V 0.4 1 V V Timing Characteristics tCP CLK Clock Period 100 ns tCH CLK Pulse Width High 50 ns tCL CLK Pulse Width Low 50 ns tCSH CLK Rise to LOAD Rise Hold Time 0 ns tDS DIN Setup Time 25 ns tDH DIN Hold Time 0 ns tDO Output Data Propagation Delay tLDCK LOAD Rising Edge to Next Clock Rising Edge 50 ns tCSW Minimum LOAD Pulse High 50 ns tDSPD Data-to-Segment Delay www.ams.com/LED-Driver-ICs/AS1105 CLOAD = 50pF 25 2.25 Revision 1.36 ns ms 4 - 15 AS1105 Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s 7 Typical Operating Characteristics Figure 4. Segment Current versa RSET 50 50 45 45 40 40 ISEGMENT (mA) . Segment Current (mA) . Figure 3. Segment Driver Capability, VDD = 5V, Logic Level = High 35 30 25 20 15 35 30 25 20 15 10 10 5 5 0 0 0 0.5 1 1.5 2 2.5 3 3.5 4 Voltage below VDD at output (V) www.ams.com/LED-Driver-ICs/AS1105 4.5 10 Revision 1.36 RSET (kOhm) 100 5 - 15 AS1105 Datasheet - D e t a i l e d D e s c r i p t i o n 8 Detailed Description 8.1 Serial-Addressing Modes The programming of the AS1105 is done via the 4-wire serial interface. A programming sequence consists of 16-bit packages. 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 signal, the data is latched into a digital or control register depending on the address. The LOAD signal must go to high after the 16th rising clock edge. The LOAD signal can also come later but just before the next rising edge of CLK, otherwise data would be lost. The content of the internal shift register is applied 16.5 clock cycles later to the DOUT pin. The data is clocked out at the falling edge of CLK. The Bits of the 16Bit-programming package are described in Table 4. The first 4 Bits D15-D12 are "don't care, D11-D8 contain the address and D7-D0 contain the data. The first bit is D15, the most significant bit (MSB). The exact timing is given in Figure 5. Figure 5. Timing Diagram tCSW LOAD tCL tC tC tC tLDCK CLK tD tD DIN D14 D15 D1 D0 tDO DOUT Table 4. Serial Data Format (16 Bits) D15 D14 D13 D12 X X X X D11 D10 D9 Address D8 D7 MSB D6 D5 D4 Data D3 D2 D1 D0 LSB 8.2 Digit and Control Registers The AS1105 incorporates 12 registers, which are listed in Table 5. The digit and control registers are selected via the 4Bit address word. The 4 digit registers are realized with a 32bit memory. Each digit can be controlled directly without rewriting the whole contents. The control registers consist of decode mode, display intensity, number of scanned digits, shutdown, display test and reset/external clock register. 8.3 Shutdown Mode The AS1105 features a shutdown mode, where it consumes only 20A current. The shutdown mode is entered via a write to register 0Ch. Then all segment current sources are pulled to ground and all digit drivers are connected to VDD, so that nothing is displayed. All internal digit registers keep the programmed values. The shutdown mode can either be used for power saving or for generating a flashing display by repeatedly entering and leaving the shutdown mode. The AS1105 needs typically 250s to exit the shutdown mode. During shutdown, the AS1105 is fully programmable. Only the display test function overrides the shutdown mode. www.ams.com/LED-Driver-ICs/AS1105 Revision 1.36 6 - 15 AS1105 Datasheet - D e t a i l e d D e s c r i p t i o n 8.4 Initial Power-up After powering up the system, all register are reset, so that the display is blank. The AS1105 starts the shutdown mode. All registers should be programmed for normal operation. The default settings enable only scan of one digit, the internal decoder is disabled, data register and intensity register are set to the minimum value. 8.5 Decode-Mode Register In the AS1105, a BCD decoder is included. Every digit can be selected via register 09h to be decoded. The BCD code consists of the numbers 09, E,H, L,P and -. In register 09h, a logic high enables the decoder for the appropriate digit. In case that the decoder is bypassed (logic low), the data Bits D7-D0 correspond to the segment lines of the AS1105. In Table 7 some possible settings for register 09h are shown. Bit D7, which corresponds to the decimal point, is not affected by the settings of the decoder. Logic high means that the decimal point is displayed. In Table 8 the font of the Code B decoder is shown. In Table 10 the correspondence of the register to the appropriate segments of a 7 segment display is shown (see Figure 6). 8.6 Intensity Control and Interdigit Blanking Brightness of the display can be controlled in an analog way by changing the external resistor (RSET). The current, which flows between VDD and ISET, defines the current that flows through the LEDs. The LED current is 100 times the ISET current. The minimum value of RSET should be 9.53k, which corresponds to 40mA segment current. The brightness of the display can also be controlled digitally via register 0Ah. The brightness can be programmed in 16 steps and is shown in Table 10. An internal pulse width modulator controls the intensity of the display. 8.7 Scan-Limit Register The scan limit register 0Bh selects the number of digits displayed. When all 4 digits are displayed the update frequency is typically 800Hz. If the number of digits displayed is reduced, the update frequency is reduced as well. The frequency can be calculated using 8fOSC/N, where N is the number of digits. Since the number of displayed digits influences the brightness, the resistor RSET should be adjusted accordingly. Table 12 shows the maximum allowed current, when fewer than 4 digits are used. To avoid differences in brightness the scan limit register should not be used to blank portions of the display (leading zeros). Table 5. Register Address Map Register Register Hex Code D15-D12 D11 D10 D9 D8 No-Op X 0 0 0 0 0xX0 Digit 0 X 0 0 0 1 0xX1 Digit 1 X 0 0 1 0 0xX2 Digit 2 X 0 0 1 1 0xX3 Digit 3 X 0 1 0 0 0xX4 Decode Mode X 1 0 0 1 0xX9 Intensity X 1 0 1 0 0xXA Scan Limit X 1 0 1 1 0xXB Shutdown X 1 1 0 0 0xXC Not used X 1 1 0 1 0xXD Reset and ext. Clock X 1 1 1 0 0xXE Display Test X 1 1 1 1 0xXF www.ams.com/LED-Driver-ICs/AS1105 Revision 1.36 7 - 15 AS1105 Datasheet - D e t a i l e d D e s c r i p t i o n Table 6. Shutdown Register Format (address (hex) = 0xXC) Register Data Mode Address Code (Hex) D7 D6 D5 D4 D3 D2 D1 D0 Shutdown Mode 0xXC X X X X X X X 0 Normal Operation 0xXC X X X X X X X 1 Table 7. Decode-mode Register Examples (address (hex) = 0xX9) Register Data Decode Mode Hex Code D7 D6 D5 D4 D3 D2 D1 D0 No decode for digits 4-0 0 0 0 0 0 0 0 0 0x00 Code B decode for digit 0 No decode for digits 4-1 0 0 0 0 0 0 0 1 0x01 Code B decode for digits 3-0 0 0 0 0 1 1 1 1 0x0F Code B decode for digits 4-0 1 1 1 1 1 1 1 1 0xFF Table 8. Code B Font 7-Segment Character Register Data D7 On Segments = 1 D6-D4 D3 D2 D1 D0 A B C D E F G 0 X 0 0 0 0 DP 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 -- X 1 0 1 0 0 0 0 0 0 0 1 E X 1 0 1 1 1 0 0 1 1 1 1 H X 1 1 0 0 0 1 1 0 1 1 1 L X 1 1 0 1 0 0 0 1 1 1 0 P X 1 1 1 0 1 1 0 0 1 1 1 blank X 1 1 1 1 0 0 0 0 0 0 0 Note: In the above table, the decimal point (DP) is set by bit D7 = 1 Table 9. No-decode Mode Data Bits and Corresponding Segment Lines Register Data Corresponding Segment Line www.ams.com/LED-Driver-ICs/AS1105 D7 D6 D5 D4 D3 D2 D1 D0 DP A B C D E F G Revision 1.36 8 - 15 AS1105 Datasheet - D e t a i l e d D e s c r i p t i o n Figure 6. Standard 7-segment LED A F B G C E D DP Table 10. Intensity Register Format (address (hex) = 0xXA) Duty Cycle D7 D6 D5 D4 D3 D2 D1 D0 Hex Code 1/32 (min on) X X X X 0 0 0 0 0xX0 3/32 X X X X 0 0 0 1 0xX1 5/32 X X X X 0 0 1 0 0xX2 7/32 X X X X 0 0 1 1 0xX3 9/32 X X X X 0 1 0 0 0xX4 11/32 X X X X 0 1 0 1 0xX5 13/32 X X X X 0 1 1 0 0xX6 15/32 X X X X 0 1 1 1 0xX7 17/32 X X X X 1 0 0 0 0xX8 19/32 X X X X 1 0 0 1 0xX9 21/32 X X X X 1 0 1 0 0xXA 23/32 X X X X 1 0 1 1 0xXB 25/32 X X X X 1 1 0 0 0xXC 27/32 X X X X 1 1 0 1 0xXD 29/32 X X X X 1 1 1 0 0xXE 31/32 (max on) X X X X 1 1 1 1 0xXF Table 11. Scan-limit Register Format (address (hex) = 0xXB) Scan Limit Register Data Hex Code D7 D6 D5 D4 D3 D2 D1 D0 Display digit 0 only X X X X X 0 0 0 0xX0 Display digits 0 & 1 X X X X X 0 0 1 0xX1 Display digits 0 1 2 X X X X X 0 1 0 0xX2 Display digits 0 1 2 3 X X X X X 0 1 1 0xX3 www.ams.com/LED-Driver-ICs/AS1105 Revision 1.36 9 - 15 AS1105 Datasheet - D e t a i l e d D e s c r i p t i o n 8.8 Display Test Register With the display test register 0Fh all LED can be tested. In the test mode all LEDs are switched on at maximum brightness (duty cycle 31/32). All programming of digit and control registers is maintained. The format of the register is given in Table 13. Table 12. Maximum Segment Current for 1-, 2-, or 3-digit Displays Number of Digits Displayed Maximum Segment Current (mA) 1 10 2 20 3 30 Table 13. Display-test Register Format (address (hex) = 0xXF) Register Data Mode 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 Note: The AS1105 remains in display-test mode until the display-test register is reconfigured for normal operation. 8.9 No-Op Register (Cascading of AS1105) The no-operation register 00h is used when AS1105s are cascaded in order to support more than 4 digit displays. The cascading must be done in a way that all DOUT are connected to DIN of the following AS1105. The LOAD and CLK signals are connected to all devices. For a write operation for example to the fifth device the command must be followed by four no-operation commands. When the LOAD signal finally goes to high all shift registers are latched. The first four devices have got no-operation commands and only the fifth device sees the intended command and updates its register. 8.10 Reset and External Clock Register This register is addressed via the serial interface. It allows to switch the device to external clock mode (If D0=1 the CLK pin of the serial interface operates as system clock input.) and to apply an external reset (D1). This brings all registers (except reg. E) to default state. For standard operation the register contents should be "00h". Table 14. Reset and external Clock register (address (hex) = 0xXE) Register Data Mode Address Code (hex) D7 D6 D5 D4 D3 D2 D1 D0 Normal Operation, internal clock 0xXE X X X X X X 0 0 Normal Operation, external clock 0xXE X X X X X X 0 1 Reset state, internal clock 0xXE X X X X X X 1 0 Reset state, external clock 0xXE X X X X X X 1 1 Table 15. RSET vs. segment current and LED forward voltage ISEG (mA) VLED(V) 1.5 2.0 2.5 3.0 3.5 40 12.2k 11.8k 11.0k 10.6k 9.69k 30 17.8k 17.1k 15.8k 15.0k 14.0k 20 29.8k 28.0k 25.9k 24.5k 22.6k 10 66.7k 63.7k 59.3k 55.4k 51.2k www.ams.com/LED-Driver-ICs/AS1105 Revision 1.36 10 - 15 AS1105 Datasheet - A p p l i c a t i o n I n 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 AS1105 shall be placed very close to the LED display to minimize effects of electromagnetic interference and wiring inductance. Furthermore, it is recommended to connect a 10F electrolytic and a 0.1F ceramic capacitor between VDD and GND to avoid power supply ripple. Also, both GNDs must be connected to ground. 9.2 Selecting RSET Resistor and Using External Drivers The current through the segments is controlled via the external resistor RSET. Segment current is about 100 times the current in ISET. The right values for ISET are given in Table 12. The maximum current the AS1105 can drive is 40mA. If higher currents are needed, external drivers must be used. In that case it is no longer necessary that the AS1105 drives high currents. A recommended value for RSET is 47k. In cases that the AS1105 only drives few digits Table 10 specifies the maximum currents and RSET must be set accordingly. Refer to Absolute Maximum Ratings to calculate acceptable limits for ambient temperature, segment current, and the LED forward-voltage drop. 9.3 4x8 LED Dot Matrix Driver The example in Figure 7 uses the AS1105 to drive an 4x8 LED dot matrix. The LED columns have common cathode and are connected to the DIG0-3 outputs. The rows are connected to the segment drivers. Each of the 32 LEDs can be addressed separately. The columns are selected via the digits as shown in Table 5. The decode mode register (0xX9) has to be programmed to `00000000' as stated in Table 7. The single LEDs in a column can be addressed as stated in Table 10, where D0 corresponds to segment G and D7 to segment DP. For a multiple digit dot matrix several AS1105 have to be cascaded. Figure 7. Application Example as LED Dot Matrix Driver 4x8 LED Dot SEG G SEG F Diode Arrangement SEG E SEG D SEG C SEG B SEG E SEG D SEG C SEG B SEG A SEG DP SEG A SEG DP DIG 0 DIG 0 DIG 3 SEG A-G DIG 0-3 DOUT 1 P 12 1 LOA CLK 9 VDD DIN GND www.ams.com/LED-Driver-ICs/AS1105 ISET DIG 3 SEG A-G DIG 0-3 DOUT 19 VBAT 1 12 AS1105 GND 4x8 LED Dot SEG G SEG F 18 9.53k 1 LOA CLK 9 VDD DIN AS1105 GND GND Revision 1.36 19 ISET 18 VBAT 9.53k 11 - 15 AS1105 Datasheet - A p p l i c a t i o n I n f o r m a t i o n 9.4 Cascading Drivers The AS1105 can be cascaded as well. The DOUT pin must be connected to the DIN pin of the following AS1105. Table 16. Package Thermal Resistance Data Package Thermal Resistance (JA) 20 Wide SO +85C/W Maximum Junction Temperature (TJ) = +150C Maximum Ambient Temperature (TA) = +85C 9.5 Computing Power Dissipation The upper limit for power dissipation (PD) for the AS1105 is determined from the following equation: PD = (VDD x 0.5mA) + (VDD - VLED)(DUTY x ISEG x N) (EQ 1) Where: VDD = supply voltage DUTY = duty cycle set by intensity register N = number of segments driven (worst case is 4) VLED = LED forward voltage ISEG = segment current set by RSET Dissipation Example: ISEG = 40mA, N = 4, DUTY = 31/32, VLED = 1.8V at 40mA, VDD = 5.25V PD = 5.25V(0.5mA) + (5.25V - 1.8V)(31/32 x 40mA x 4) = 0.54W Thus, for a SO package JA = +85C/W (see Table 13), the maximum allowed ambient temperature TA is given by: TJ,MAX = TA + PD x JA = 150C = TA +0.54W x 85C/W (EQ 2) Where: TA = +104C www.ams.com/LED-Driver-ICs/AS1105 Revision 1.36 12 - 15 AS1105 Datasheet - P a c k a g e D r a w i n g s a n d M a r k i n g s 10 Package Drawings and Markings The device is available in a 20-pin SOIC package. Figure 8. SOIC-20 Package Drawings & Dimensions Symbol A A1 A2 B C D E e Min 2.44 0.10 2.24 0.36 0.23 12.65 7.40 www.ams.com/LED-Driver-ICs/AS1105 Max 2.64 0.30 2.44 0.46 0.32 12.85 7.60 1.27 BSC Symbol H h J K L R ZD Revision 1.36 Min 10.11 0.31 0.53 Max 10.51 0.71 0.73 7 BSC 0.51 0.63 1.01 0.89 0.66 REF 0 8 13 - 15 AS1105 Datasheet - O r d e r i n g I n f o r m a t i o n 11 Ordering Information The device is available as the standard products listed in Table 17. Table 17. Ordering Information Part AS1105WL -40C to +85C Temp Range Package 20-pin SOIC Delivery Form Tubes AS1105WL-T -40C to +85C 20-pin SOIC T&R Note: All products are RoHS compliant. Buy our products or get free samples online at www.ams.com/ICdirect Technical Support is available at www.ams.com/Technical-Support For further information and requests, email us at sales@ams.com (or) find your local distributor at www.ams.com/distributor www.ams.com/LED-Driver-ICs/AS1105 Revision 1.36 14 - 15 AS1105 Datasheet - O r d e r i n g I n f o r m a t i o n Copyrights Copyright (c) 1997-2012, ams AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered (R). All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. All products and companies mentioned are trademarks or registered trademarks of their respective companies. Disclaimer Devices sold by ams AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. ams AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. ams AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with ams AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by ams AG for each application. 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