austriamicrosystems AG is now ams AG The technical content of this austriamicrosystems datasheet is still valid. Contact information: Headquarters: ams AG Tobelbaderstrasse 30 8141 Unterpremstaetten, Austria Tel: +43 (0) 3136 500 0 e-Mail: [email protected] Please visit our website at www.ams.com 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 2 Key Features Every segment can be individually addressed and updated separately. Only one external resistor (RSET) 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 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 applications. The diagnostic allows to detect individual open or shorted LEDs. am lc s on A te G nt st il 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 al id 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. lv 1 General Description The AS1116 features a low shutdown current of typically 200nA, and an operational current of typically 350µA. The number of digits can be programmed, the devices can be reset by software, and an external clock is also supported. 3 Applications The AS1116 is ideal for seven-segment or dot matrix displays in public 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. The device is available in a QSOP-24 and TQFN(4x4)-24 package. ca Figure 1. AS1116 - Typical Application Diagram ni 8 SEGA to G, SEG DP ch VDD 2.7V to 5.5V DIG0 to DIG7 9.53kΩ Te ISET I/O µP 8 8 8 8 GND AS1116 SDO SDI SDI SCL LD AS1116 SDO LD SCL SDI SCL AS1116 SDO LD I/O I/O I/O Diagnostic readback: open & shorted LEDs www.austriamicrosystems.com/LED-Driver-ICs/AS1116 Revision 1.08 1 - 23 AS1116 Datasheet - P i n o u t 4 Pinout Pin Assignments DIG3 2 17 SEGC AS1116 DIG4 4 15 SEGG 14 SEGB 13 SEGF 7 8 9 10 11 12 DIG7 LD ISET 6 DIG6 N/C 12 LD 11 DIG7 10 DIG6 9 DIG5 8 DIG4 7 N/C 16 VDD lv 3 Table 1. Pin Descriptions Pin Name QSOP-24 TQFN(4x4)-24 SDI 1 22 DIG0:DIG7 2-5, 7-10 GND 6 LD 11 N/C 12 ISET 13 SCL 14 SCL SEGA am lc s on A te G nt st il GND 6 DIG3 5 DIG2 4 DIG1 3 DIG0 2 SDI 1 Pin Descriptions Description Serial-Data Input. Data is loaded into the internal 16-bit shift register on the rising edge of pin SCL. ca 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 VDD or a reference voltage through RSET 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. ni 15-18, 20-23 19 ch VDD al id 18 SEG E DIG5 5 SEGA:SEGG, SEGDP SEGDP SEGD SDI SDO 24 23 22 21 20 19 DIG2 1 GND AS1116 DIG0 DIG1 13 ISET 14 SCL 15 SEGA 16 SEGF 17 SEGB 18 SEGG 19 VDD 20 SEGC 21 SEG E 22 SEGDP 23 SEGD 24 SDO Figure 2. Pin Assignments (Top View) 24 21 - Exposed Pad Te SDO www.austriamicrosystems.com/LED-Driver-ICs/AS1116 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. Revision 1.08 2 - 23 AS1116 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 Max Units -0.3 7 V -0.3 7 or VDD + 0.3 V DIG0:DIG7 Sink Current 500 mA SEGA:SEGG, SEGDP 100 mA Electrical Parameters VDD to GND Input Voltage Range Current All other pins to GND Input Current (latch-up immunity) ±100 mA Electrostatic Discharge Thermal Information Norm: JEDEC 78 am lc s on A te G nt st il Electrostatic Discharge Notes al id Min lv Parameter Digital outputs 1000 V All other pins 1000 V 88 ºC/W on PCB, QSOP-24 package 30.5 ºC/W on PCB, TQFN(4x4)-24 package +150 °C +150 ºC Thermal Resistance ΘJA Norm: MIL 833 E method 3015 Temperature Ranges and Storage Conditions Junction Temperature Storage Temperature -55 Package Body Temperature Humidity non-condensing ºC 85 % QSOP-24 package 1 % Represents a max. floor life time of unlimited TQFN(4x4)-24 package 3 % Represents a max. floor life time 168h Te ch ni ca Moisture Sensitive Level 5 +260 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). www.austriamicrosystems.com/LED-Driver-ICs/AS1116 Revision 1.08 3 - 23 AS1116 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 = 2.7 to 5.5V, RSET = 9.53kΩ, Typical values are at TAMB = +25°C, VDD = 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 Parameter Conditions Min TAMB Operating Temperature Range -40 TJ Operating Junction Temperature -40 VDD Operating Supply Voltage 2.7 IDDSD Shutdown Supply Current IDD Operating Supply Current All segments and decimal point on; ISEG = -40mA. fOSC Display Scan Rate 8 digits scanned Typ 0.2 RSET = open circuit. 0.35 Unit +85 °C +125 °C 5.5 V 2 µA 0.6 lv All digital inputs at VDD or GND, TAMB = +25ºC Max al id Symbol mA 1.2 kHz am lc s on A te G nt st il 335 mA IDIGIT Digit Drive Sink Current ISEG Segment Drive Source Current ∆ISEG Segment Drive Current Matching ISEG Segment Drive Source Current VOUT = 0.65V VDD = 5.0V, VOUT = (VDD -1V) 0.6 0.8 320 -37 -42 -47 3 Average Current mA % 47 mA Max 1 Unit µA Table 4. Logic Inputs/Outputs Characteristics Symbol IIH, IIL Parameter Input Current SDI, SCL, LD VIH Logic High Input Voltage VIL Logic Low Input Voltage VOH Output High Voltage ∆VI Min -1 Typ 4.5V < VDD < 5.5V 0.6 x VDD V 2.7V < VDD < 4.5V 0.7 x VDD V VDD = 5.0V 0.8 VDD = 3.0V 0.6 SDO, ISOURCE = -1mA, VDD = 5.0V VDD - 1 SDO, ISOURCE = -1mA, VDD = 3.0V VDD - 0.5 Output Low Voltage SDO, ISINK = 1mA Hysteresis Voltage SDI, SCL, LD ca VOL Conditions VIN = 0V or VDD 0.4 0.7x VDD ni Open Detection Level Threshold 0.05x VDD V V V 0.8x VDD 0.15x VDD V V Te ch Short Detection Level Threshold 1 0.75x VDD 0.1x VDD V www.austriamicrosystems.com/LED-Driver-ICs/AS1116 Revision 1.08 4 - 23 AS1116 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 Table 5. SPI Timing Characteristics Conditions Min 100 20 20 25 10 0 5 CLOAD = 50pF Typ Max 25 20 20 2.25 Te ch ni ca am lc s on A te G nt st il See Figure 19 on page 10 for more information. Unit ns ns ns ns ns ns ns ns ns ns ms al id Parameter SCL Clock Period SCL Pulse Width High SCL Pulse Width Low LD to SCL Rise Setup Time SCL Rise to LD Rise Hold Time SDI Setup Time SDI Hold Time Output Data Propagation Delay LD Rising Edge to SCL Rising Edge Minimum LD Pulse High Data-to-Segment Delay lv Symbol tCP tCH tCL tCSS tCSH tDS tDH tDO tLDCK tCSW tDSPD www.austriamicrosystems.com/LED-Driver-ICs/AS1116 Revision 1.08 5 - 23 AS1116 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 RSET = 9.53kΩ, VRset = VDD; 980 960 960 940 940 900 880 920 900 880 Vdd = 2.7V Vdd = 4V Tamb = - 40°C 860 Tamb = + 25°C Vdd = 5V am lc s on A te G nt st il 860 Vdd = 5.5V Tamb = + 85°C 840 2.7 3.1 3.5 3.9 4.3 4.7 5.1 840 -40 5.5 -15 10 Vdd (V) Iseg (mA) . 20 Vseg = 1.7V; Vdd = 2.7V Vseg = 1.7V; Vdd = 5V 10 Vseg Vseg Vseg Vseg 30 20 10 0 -15 10 35 60 85 0 10 20 Tamb (°C) 30 40 50 60 70 80 90 Rset (kOhm) Figure 8. Segment Current vs. VDD; VRset = 2.8V ni Figure 7. Segment Current vs. Supply Voltage; 50 Vseg Vseg Vseg Vseg ch 45 40 = 1.7V = 2V = 2.3V = 3.1V 35 Iseg (mA) . 40 Te Iseg (mA) . = 4V; Vdd = 5V = 3V; Vdd = 5V = 2V; Vdd = 5V = 1.7V; Vdd = 2.7V Vseg = 3V; Vdd = 5V Vseg = 4V; Vdd = 5V ca Iseg (mA) . 30 50 85 Figure 6. Segment Current vs. RSET; 40 40 60 60 50 50 0 -40 35 Tamb (°C) Figure 5. Segment Current vs. Temperature; 60 lv 920 al id Figure 4. Display Scan Rate vs. Temperature; 980 fosc (Hz) . fosc (Hz) . Figure 3. Display Scan Rate vs. Supply Voltage; 30 20 25 20 15 Vseg = 1.7V 10 Vseg = 3V 10 30 Vseg = 4V 5 0 0 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 2.7 Vdd (V) www.austriamicrosystems.com/LED-Driver-ICs/AS1116 3 3.3 3.6 3.9 4.2 Vdd (V) Revision 1.08 6 - 23 AS1116 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 Figure 9. VDIGIT vs. IDIGIT Figure 10. Input High Level vs. Supply Voltage 0.4 3.5 3 2.5 0.2 1.5 1 = 2.7V = 3.3V = 4V = 5V = 5.5V 0.5 0 0 0.05 0.1 0.15 0.2 Idig (A) 0.25 0.3 Figure 11. ISEG vs. VSEG; VDD = 5V 50 40 3.5 4.3 4.7 5.1 5.5 Vdd (V) 50 = 10k = 13k = 18k = 30k = 56k Rext Rext Rext Rext Rext 45 40 = 8k2 = 10k = 13k = 18k = 30k Iseg (mA) . 30 30 25 25 20 20 15 15 10 10 5 5 0 0 2 2.5 3 3.5 4 4.5 5 1 1.5 2 ca ni 45 ch 40 3 3.5 4 Rext Rext Rext Rext Rext Figure 14. ISEG vs. VSEG; VDD = 2.7V = 6k8 = 8k2 = 10k = 13k = 18k 35 30 Te 25 20 50 Rext Rext Rext Rext Rext 45 40 = 4k7 = 5k6 = 6k8 = 10k = 13k 35 Iseg (mA) . Figure 13. ISEG vs. VSEG; VDD = 3.3V 50 2.5 Vseg (V) Vseg (V) Iseg (mA) . 3.9 35 35 Iseg (mA) . 3.1 Figure 12. ISEG vs. VSEG; VDD = 4V Rext Rext Rext Rext Rext 45 2.7 0.35 am lc s on A te G nt st il 0 lv Vdd Vdd Vdd Vdd Vdd 0.1 2 al id Vih (V) . Vdig (V) . 0.3 30 25 20 15 15 10 10 5 5 0 0 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 1 Vseg (V) www.austriamicrosystems.com/LED-Driver-ICs/AS1116 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 Vseg (V) Revision 1.08 7 - 23 AS1116 Datasheet - D e t a i l e d D e s c r i p t i o n 8 Detailed Description Block Diagram al id Figure 15. Block Diagram (QSOP-24 Package) Open/Short Detection + – lv VDD RSET 19 am lc s on A te G nt st il + VDD – Oszillator 13 ISET 8 SEGA-G, SEGDP Digital Control Logic 11 LD 1 SDI 14 SCL 24 8 2-5, 7-10 DIG0 to DIG7 (PWM, Debounce,....) Registers SPI Interface Data - Registers Control - Registers Scan - Registers 6 GND AS1116 ni ca SDO 15-18, 20-23 ch Figure 16. ESD Structure Te VDD valid for the pins: - SDI - SCL - SDO - LD - ISET - SEGA-G, SEGDP www.austriamicrosystems.com/LED-Driver-ICs/AS1116 VDD valid for the pins: - DIG0 to DIG7 Revision 1.08 8 - 23 AS1116 Datasheet - D e t a i l e d D e s c r i p t i o n Serial Interface The AS1116 contains a 16bit SPI interface to access the internal data and control registers of the device (see Digit- and Control-Registers on page 11). The SPI interface is driven with the rising edge of SCL. A falling edge on LD signal indicates the beginning of an access on the SPI interface, the rising edge on LD determines an access on SPI. An access must consist of exactly 16bits for write operation and 8bits for read operation. Timing restrictions on the SPI interface pins are defined in Figure 19. Table 6 shows the structure of the 16bit command word for writing data. The bits D0 to D7 are the data information, bits D8 to D12 are the address bits, D13 is set to ‘0’, bit D14 is defining the read (D14 = ‘1’) or the write (D14 = ‘0’) configuration and bit D15 is a don’t care bit. al id In Table 7 on page 11 the 8bit command word for the read operation can be found. Bit D0 (write operation) or bit D8 (read operation) is the first bit to shift into the SPI interface after the falling edge of LD. Bit D15 is the last bit to write to SPI before rising edge of LD. lv At a read operation an 8bit operation is executed (see Figure 18). At the first rising edge of SCL after the rising edge of LD D7 of addressed register is written to SDO pin. At the next rising edge of SCL D6 is written to SDO pin. LD must be kept high during reading data from a internal data or control register of AS1116. Table 6. 16-Bit Serial Data Format D1 D2 D3 D4 Data Figure 17. Write operation 1 SCL LD D0 D1 SDO D0 D1 1 SCL LD SDI D7 MSB D8 D9 D10 D11 D12 Register Address (see Table 7) D13 0 D14 R/W 8 9 D15 X 16 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D14 D15 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D14 D15 8 9 16 ni D9 D10 D11 D12 D13 D14 D15 D7 D6 D5 D4 D3 D2 D1 D0 Te ch SDO D8 D6 ca SDI Figure 18. Read operation D5 am lc s on A te G nt st il D0 LSB www.austriamicrosystems.com/LED-Driver-ICs/AS1116 Revision 1.08 9 - 23 AS1116 Datasheet - D e t a i l e d D e s c r i p t i o n Figure 19. Interface Timing LD tCSW tLDCK tCH tDH tDS D0 D1 D14 D15 tDO Initial Power-Up am lc s on A te G nt st il SDO lv SDI al id tCL SCL tCSH tCP tCSS On initial power-up, the AS1116 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 15) is set to the minimum values. Shutdown Mode The AS1116 devices feature a shutdown mode, where they consume only 200nA (typ) current. Shutdown mode is entered via a write to the Shutdown Register (see Table 8). For the AS1116, at that point, all segment current sources and digital drivers are switched off, so that all segments are blanked. 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). ca When entering or leaving shutdown mode, the Feature Register is reset to its default values (all 0s) when Shutdown Register bit D7 (page 12) = 0. Te ch ni Note: When Shutdown Register bit D7 = 1, the Feature Register is left unchanged when entering or leaving shutdown mode. If the AS1116 is used with an external clock, Shutdown Register bit D7 should be set to 1 when writing to the Shutdown Register. www.austriamicrosystems.com/LED-Driver-ICs/AS1116 Revision 1.08 10 - 23 AS1116 Datasheet - D e t a i l e d D e s c r i p t i o n Digit- and Control-Registers The AS1116 devices contain 8 Digit-Registers,11 control-registers and 8 diagnostic-registers, which are listed in Table 7. All registers are selected using a 8-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 features selection registers. Address D15 D14 D13 D12 D11 D10 D9 D8 No-Op X 0 0 0 0 0 0 0 Digit 0 X 0 0 0 0 0 0 1 Digit 1 X 0 0 0 0 0 1 0 Digit 2 X 0 0 0 0 0 1 1 Digit 3 Digit 4 Digit 5 Digit 6 Digit 7 Decode-Mode Global Intensity Control Register Scan Limit Shutdown Not Used Feature Display Test Mode DIG0:DIG1 Intensity DIG2:DIG3 Intensity DIG4:DIG5 Intensity Diagnostic Digit 1 Diagnostic Digit 2 16 N/A N/A N/A (see Table 10 on page 12, Table 11 on page 13 and Table 12 on page 13) 0 0 0 0 1 0 0 X 0 0 0 0 1 0 1 X 0 0 0 0 1 1 0 N/A X 0 0 0 0 1 1 1 N/A X 0 0 0 1 0 0 0 X 0 0 0 1 0 0 1 (see Table 9 on page 12) 12 X 0 0 0 1 0 1 0 (see Table 16 on page 15) 15 X 0 0 0 1 0 1 1 (see Table 18 on page 15) 15 N/A (see Table 8 on page 12) N/A N/A X 0 0 0 1 1 0 0 X 0 0 0 1 1 0 1 X 0/1 0 0 1 1 1 0 (see Table 19 on page 16) 16 X 0 0 0 1 1 1 1 (see Table 13 on page 14) 12 X 0 0 1 0 0 0 0 (see Table 17 on page 15) X 0 0 1 0 0 0 1 (see Table 17 on page 15) X 0 0 1 0 0 1 0 (see Table 17 on page 15) X 0 0 1 0 0 1 1 (see Table 17 on page 15) X 1 0 12 N/A 1 0 1 0 0 N/A X 1 0 1 0 1 0 1 N/A X 1 0 1 0 1 1 0 N/A X 1 0 1 0 1 1 1 N/A ni Diagnostic Digit 3 Diagnostic Digit 4 X 1 0 1 1 0 0 0 N/A Diagnostic Digit 5 X 1 0 1 1 0 0 1 N/A Diagnostic Digit 6 X 1 0 1 1 0 1 0 N/A Diagnostic Digit 7 X 1 0 1 1 0 1 1 N/A ch Diagnostic Register Diagnostic Digit 0 Page X ca DIG6:DIG7 Intensity D7:D0 lv Register am lc s on A te G nt st il Digit Register Type Table 7. Register Address Map al id Te Note: Write operation: D14=0; Read operation: D14=1. www.austriamicrosystems.com/LED-Driver-ICs/AS1116 Revision 1.08 11 - 23 AS1116 Datasheet - D e t a i l e d D e s c r i p t i o n The Shutdown Register controls AS1116 shutdown mode. Table 8. Shutdown Register Format (Address (HEX) = 0x0C)) Register Data HEX Code D7 D6 D5 D4 D3 D2 D1 D0 0x00 0 X X X X X X 0 0x80 1 X X X X X X 0 0x01 0 X X X X X X 1 0x81 1 X X X X X X 1 Mode al id Shutdown Mode, Reset Feature Register to Default Settings Shutdown Mode, Feature Register Unchanged Normal Operation, Reset Feature Register to Default Settings Normal Operation, Feature Register Unchanged Decode Enable Register (0x09) lv 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 16) 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. am lc s on A te G nt st il 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 AS1116. Table 12 shows the 1:1 pairing of each data bit to the appropriate segment line. Table 9. Decode Enable Register Format Examples Decode Mode HEX Code No decode for digits 7:0 Code-B/HEX decode for digit 0. No decode for digits 7:1 Code-B/HEX decode for digit 0:2. No decode for digits 7:3 Code-B/HEX decode for digits 0:5. No decode for digits 7:6 Code-B/HEX decode for digits 0,2,5. No decode for digits 1, 3, 4, 6, 7 0x00 0x01 0x07 0x3F 0x25 Table 10. Code-B Font Register Data D7 D6:D4 X D3 D2 D1 D0 Character ca Character D6: D4 D3 D2 D1 D0 Register Data D5 D4 D3 D2 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 0 0 1 D1 0 0 1 1 0 D0 0 1 1 1 1 Register Data D7 D6:D4 D3 D2 D1 D0 0 0 0 X 0 1 1 0 X 1 1 0 0 0 0 0 1 X 0 1 1 1 X 1 1 0 1 X 0 0 1 0 X 1 0 0 0 X 1 1 1 0 X 0 0 1 1 X 1 0 0 1 X 1 1 1 1 X 0 1 0 0 X 1 0 1 0 X X X X X X 0 1 0 1 X 1 0 1 1 ni ch Te D7 Character D6 0 0 0 0 0 0 X * Register Data D7 0 0 0 0 0 * 1 The decimal point can be enabled with every character by setting bit D7 = 1. www.austriamicrosystems.com/LED-Driver-ICs/AS1116 Revision 1.08 12 - 23 AS1116 Datasheet - D e t a i l e d D e s c r i p t i o n Table 11. HEX Font * Register Data D6:D4 D3 D2 D1 D0 Register Data D7 D6: D4 D3 D2 D1 D0 Character Register Data D7 D6:D4 D3 D2 D1 D0 0 0 0 0 X 0 1 1 0 X 1 1 0 0 X 0 0 0 1 X 0 1 1 1 X 1 1 0 1 X 0 0 1 0 X 1 0 0 0 X 1 1 1 0 X 0 0 1 1 X 1 0 0 1 X 1 1 1 1 X 0 1 0 0 X 1 0 1 0 X X X X X X 0 * 1 al id X lv D7 Character am lc s on A te G nt st il Character 1 0 1 X 1 0 1 1 The decimal point can be enabled with every character by setting bit D7 = 1. Table 12. No-Decode Mode Data Bits and Corresponding Segment Lines Corresponding Segment Line D7 DP D6 A D5 B D4 C D3 D D2 E D1 F D0 G Figure 20. Standard 7-Segment LED F D B C DP Te ch ni ca E A G www.austriamicrosystems.com/LED-Driver-ICs/AS1116 Revision 1.08 13 - 23 AS1116 Datasheet - D e t a i l e d D e s c r i p t i o n Display-Test Mode The AS1116 can detect open or shorted LEDs. Readout of either open LEDs (D2=1) or short LEDs (D1=1) is possible, as well as a OR relation of open and short (D1=D2=1). After a diagnostic run bit D4 can be read to clarify if an error occurred before reading out detailed diagnostic data. Note: All settings of the digit- and control-registers are maintained. Table 13. Testmode Register Summary D6 REXT_short D5 REXT_open D4 LED_global D3 LED_test D2 LED_open D1 LED_short D0 DISP_test al id D7 X Table 14. Testmode Register Bit Description (Address (HEX) = 0x0F)) Addr: 0x0F Address Bit Name Default Access D7:D0 D0 DISP_test 0 W Optical display test. (Testmode for external visual test.) 0: Normal operation; 1: Run display test (All digits are tested independently from scan limit & shutdown register.) D1 LED_short 0 W Starts a test for shorted LEDs. (Can be set together with D2) 0: Normal operation; 1: Activate testmode D2 LED_open 0 W Starts a test for open LEDs. (Can be set together with D1) 0: Normal operation; 1: Activate testmode D3 LED_test 0 R Indicates an ongoing open/short LED test 0: No ongoing LED test; 1: LED test in progress D4 LED_global 0 R Indicates that the last open/short LED test has detected an error 0: No error detected; 1: Error detected D5 REXT_open 0 R Checks if external resistor REXT is open 0: REXT correct; 1: REXT is open D6 REXT_short 0 R Checks if external resistor REXT is shorted 0: REXT correct; 1: REXT is shorted 0 - Not used am lc s on A te G nt st il lv Bit D7 LED Diagnostic Registers These eight registers contain the result of the LED open/short test for the individual LED of each digit. Table 15. LED Diagnostic Register Address Digit D7 DP D6 A D5 B D4 C D3 D2 D ni DIG0 DIG1 DIG2 DIG3 ca Segment E D1 F D0 G Register HEX Address 0x18 0x19 0x1A 0x1B Segment Digit D7 D6 D5 D4 D3 D2 D1 D0 DIG4 DIG5 DIG6 DIG7 DP A B C D E F G ch Register HEX Address 0x14 0x15 0x16 0x17 Te Note: If more than 2 shorts occure in the LED array, detection of individual LED fault could become limited to blocs. www.austriamicrosystems.com/LED-Driver-ICs/AS1116 Revision 1.08 14 - 23 AS1116 Datasheet - D e t a i l e d D e s c r i p t i o n Intensity Control Register (0x0A) The brightness of the display can be controlled by digital means using the Intensity Control Registers and by analog means using RSET (see Selecting RSET Resistor Value and Using External Drivers on page 17). The intensity can be controlled globally for all digits, or for each digit individually. The global intensity command will write intensity data to all four individual brightness registers, while the individual intesity command will only write to the associated individual intensity register. Table 16. Intensity Register Format 1/16 (min on) 2/16 3/16 4/16 5/16 6/16 7/16 8/16 0xX0 0xX1 0xX2 0xX3 0xX4 0xX5 0xX6 0xX7 MSB 0 0 0 0 0 0 0 0 Register Data D2 D1 0 0 0 0 0 1 0 1 1 0 1 0 1 1 1 1 LSB 0 1 0 1 0 1 0 1 Duty Cycle HEX Code 9/16 10/16 11/16 12/16 13/16 14/16 15/16 15/16 (max on) 0xX8 0xX9 0xXA 0xXB 0xXC 0xXD 0xXE 0xXF MSB 1 1 1 1 1 1 1 1 Register Data D2 D1 0 0 0 0 0 1 0 1 1 0 1 0 1 1 1 1 LSB 0 1 0 1 0 1 0 1 lv HEX Code am lc s on A te G nt st il Duty Cycle al id 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 15/16 down to 1/16 of the peak current set by RSET. Table 17. Intensity Register Address Register HEX Address 0x0A 0x10 0x11 0x12 0x13 Register Data Type Global Digit Digit Digit Digit D7:D4 X Digit 1 Intensity Digit 3 Intensity Digit 5 Intensity Digit 7 Intensity D3:D0 Global Intensity Digit 0 Intensity Digit 2 Intensity Digit 4 Intensity Digit 6 Intensity 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 0.8kHz. 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. Note: To avoid differences in brightness this register should not be used to blank parts of the display (leading zeros). Scan Limit HEX Code 0xX0 0xX1 0xX2 0xX3 Register Data D7:D3 D2 D1 D0 X 0 0 0 X 0 0 1 X 0 1 0 X 0 1 1 Scan Limit HEX Code Display digits 0:4 Display digits 0:5 Display digits 0:6 Display digits 0:7 0xX4 0xX5 0xX6 0xX7 Register Data D7:D3 D2 D1 D0 X 1 0 0 X 1 0 1 X 1 1 0 X 1 1 1 Te ch ni Display digit 0 only Display digits 0:1 Display digits 0:2 Display digits 0:3 ca Table 18. Scan-Limit Register Format (Address (HEX) = 0x0B)) www.austriamicrosystems.com/LED-Driver-ICs/AS1116 Revision 1.08 15 - 23 AS1116 Datasheet - D e t a i l e d D e s c r i p t i o n Feature Register (0x0E) 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, setting the blinking rate, and resetting the blink timing. Note: At power-up the Feature Register is initialized to 0. D7 D6 D5 D4 D3 D2 D1 blink_start sync blink_freq_sel blink_en NU decode_sel reg_res Table 20. Feature Register Bit Descriptions (Address (HEX) = 0xXE) D2 D3 D4 D5 D6 lv ni D7 am lc s on A te G nt st il D1 clk_en ca D0 D0 Feature Register Enables and disables various device features. Bit Name Default Access Bit Description External clock active. clk_en 0 R/W 0 = Internal oscillator is used for system clock. 1 = Pin CLK of the serial interface operates as system clock input. Resets all control registers except the Feature Register. 0 = Reset Disabled. Normal operation. reg_res 0 R/W 1 = All control registers are reset to default state (except the Feature Register) identically after power-up. Note: The Digit Registers maintain their data. Selects display decoding for the selected digits (Table 9 on page 12). decode_sel 0 = Enable Code-B decoding (see Table 10 on page 12). 0 R/W 1 = Enable HEX decoding (see Table 11 on page 13). NU Not used Enables blinking. blink_en 0 R/W 0 = Disable blinking. 1 = Enable blinking. Sets blink with low frequency (with the internal oscillator enabled): blink_freq_sel 0 = Blink period typically is 1 second (0.5s on, 0.5s off). 0 R/W 1 = Blink period is 2 seconds (1s on, 1s off). Synchronizes blinking on the rising edge of pin LD. The multiplex and blink timing sync counter is cleared on the rising edge of pin LD. By setting this bit in multiple devices, the 0 R/W blink timing can be synchronized across all the devices. Start Blinking with display enabled phase. When bit D4 (blink_en) is set, bit D7 determines how blinking starts. blink_start 0 R/W 0 = Blinking starts with the display turned off. 1 = Blinking starts with the display turned on. Addr: 0xXE Bit al id Table 19. Feature Register Summary No-Op Register (0xX0) ch The No-Op Register is used when multiple AS1116 devices are cascaded in order to support displays with more than 8 digits. The cascading must be done in such a way that all SDO pins are connected to SDI of the next AS1116 (see Figure 21 on page 18). The LD and SCL signals are connected to all devices. Te 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 LD 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. www.austriamicrosystems.com/LED-Driver-ICs/AS1116 Revision 1.08 16 - 23 AS1116 Datasheet - Ty p i c a l A p p l i c a t i o n 9 Typical Application 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. al id 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 Table 21 & Table 22. The maximum current the AS1116 can drive is 47mA. If higher currents are needed, external drivers must be used, in which case it is no longer necessary that the devices drive high currents. Note: The display brightness can also be logically controlled (see Intensity Control Register (0x0A) on page 15). Table 21. RSET vs. Segment Current and LED Forward Voltage, VDD = 2.7V & 3.3V & 3.6V VLED 2.0V 2.5V 1.5V 5kΩ 6.9kΩ 10.7kΩ 22.2kΩ 4.4kΩ 5.9kΩ 9.6kΩ 20.7kΩ 6.7kΩ 9.1kΩ 13.9kΩ 28.8kΩ 6.4kΩ 8.8kΩ 13.3kΩ 27.7kΩ 5.7kΩ 8.1kΩ 12.6kΩ 26kΩ 7.5kΩ 10.18kΩ 15.6kΩ 31.9kΩ VDD = 3.6V 1.5V VDD = 3.3V 2.0V 2.0V 2.5V 3.0V 7.2kΩ 9.8kΩ 15kΩ 31kΩ 6.6kΩ 9.2kΩ 14.3kΩ 29.5kΩ 5.5kΩ 7.5kΩ 13kΩ 27.3kΩ am lc s on A te G nt st il VDD = 2.7V 40 30 20 10 VLED 1.5V lv VLED ISEG (mA) Table 22. RSET vs. Segment Current and LED Forward Voltage, VDD = 4.0V & 5.0V VLED VLED 2.0V 2.5V 3.0V 3.5V 1.5V 2.0V 2.5V 3.0V 3.5V 4.0V 40 30 20 10 8.6kΩ 11.6kΩ 17.7kΩ 36.89kΩ 8.3kΩ 11.2kΩ 17.3kΩ 35.7kΩ 7.9kΩ 10.8kΩ 16.6kΩ 34.5kΩ 7.6kΩ 9.9kΩ 15.6kΩ 32.5kΩ 5.2kΩ 7.8kΩ 13.6kΩ 29.1kΩ 11.35kΩ 15.4kΩ 23.6kΩ 48.9kΩ 11.12kΩ 15.1kΩ 23.1kΩ 47.8kΩ 10.84kΩ 14.7kΩ 22.6kΩ 46.9kΩ 10.49kΩ 14.4kΩ 22kΩ 45.4kΩ 10.2kΩ 13.6kΩ 21.1kΩ 43.8kΩ 9.9kΩ 13.1kΩ 20.2kΩ 42kΩ VDD = 5.0V 1.5V VDD = 4.0V ISEG (mA) Calculating Power Dissipation The upper limit for power dissipation (PD) for the AS1116 is determined from the following equation: PD = (VDD x 5mA) + (VDD - VLED)(DUTY x ISEG x N) Where: (EQ 1) ni ca VDD is the supply voltage. DUTY is the duty cycle set by intensity register (page 15). 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: ch ISEG = 40mA, N = 8, DUTY = 15/16, VLED = 2.2V at 40mA, VDD = 5V PD = 5V(5mA) + (5V - 2.2V)(15/16 x 40mA x 8) = 0.865W (EQ 2) (EQ 3) Te Thus, for a QSOP-24 package ΘJA = +88°C/W, the maximum allowed TAMB is given by: TJ,MAX = TAMB + PD x ΘJA = 150°C = T AMB + 0.865W x 88°C/W (EQ 4) In this example the maximum ambient temperature must stay below 73.88°C. www.austriamicrosystems.com/LED-Driver-ICs/AS1116 Revision 1.08 17 - 23 AS1116 Datasheet - Ty p i c a l A p p l i c a t i o n 8x8 Dot Matrix Mode The application example in Figure 21 shows the AS1116 in the 8x8 LED dot matrix mode. 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 11. Figure 21. Application Example as LED Dot Matrix Driver DIG0 to DIG7 VDD 2.7 to 5V 9.53kΩ SEG A to G SEP DP I/O I/O µP I/O am lc s on A te G nt st il ISET lv Note: For a multiple-digit dot matrix, multiple AS1116 devices can be cascaded easily. al id The Decode Enable Register (see page 12) must be set to ‘00000000’ as described in Table 9 on page 12. Single LEDs in a column can be addressed as described in Table 12 on page 13, where bit D0 corresponds to segment G and bit D7 corresponds to segment DP. SDI AS1116 SCL Diode Arrangement LD SDO I/O Diagnostic readback: open & shorted LEDs GND Supply Bypassing and Wiring In order to achieve optimal performance the AS1116 should be placed very close to the LED display to minimize effects of electromagnetic interference and wiring inductance. Te ch ni ca 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 21 on page 18). www.austriamicrosystems.com/LED-Driver-ICs/AS1116 Revision 1.08 18 - 23 AS1116 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 lv al id Figure 22. QSOP-24 Marking Table 23. Packaging Code YY am lc s on A te G nt st il Figure 23. TQFN(4x4)-24 Marking R/X ZZ plant identifier free choice / traceability code Te ch ni ca last two digits of the current year WW manufacturing week www.austriamicrosystems.com/LED-Driver-ICs/AS1116 Revision 1.08 19 - 23 AS1116 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 Te ch ni ca am lc s on A te G nt st il lv al id Figure 24. QSOP-24 Package www.austriamicrosystems.com/LED-Driver-ICs/AS1116 Revision 1.08 20 - 23 AS1116 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 Te ch ni ca am lc s on A te G nt st il lv al id Figure 25. TQFN(4x4)-24 Package www.austriamicrosystems.com/LED-Driver-ICs/AS1116 Revision 1.08 21 - 23 AS1116 Datasheet - O r d e r i n g I n f o r m a t i o n 11 Ordering Information The devices are available as the standard products shown in Table 24. Table 24. Ordering Information Description 64 LED Driver with Detailed Error Detection 64 LED Driver with Detailed Error Detection Delivery Form Tape and Reel Tape and Reel 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 Te ch ni ca am lc s on A te G nt st il For further information and requests, please contact us mailto:[email protected] or find your local distributor at http://www.austriamicrosystems.com/distributor Package QSOP-24 TQFN(4x4)-24 al id Marking AS1116 ASR9 lv Ordering Code AS1116-BSST AS1116-BQFT www.austriamicrosystems.com/LED-Driver-ICs/AS1116 Revision 1.08 22 - 23 AS1116 Datasheet Copyrights Copyright © 1997-2012, austriamicrosystems AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered ®. 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. al id Disclaimer lv Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. austriamicrosystems 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. austriamicrosystems 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 austriamicrosystems 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 austriamicrosystems AG for each application. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard production flow, such as test flow or test location. ca am lc s on A te G nt st il The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems AG rendering of technical or other services. Headquarters ni Contact Information ch austriamicrosystems AG Tobelbaderstrasse 30 A-8141 Unterpremstaetten, Austria Te Tel: +43 (0) 3136 500 0 Fax: +43 (0) 3136 525 01 For Sales Offices, Distributors and Representatives, please visit: http://www.austriamicrosystems.com/contact www.austriamicrosystems.com/LED-Driver-ICs/AS1116 Revision 1.08 23 - 23