Data Sheet AS2590 LC DISPLAY DRIVER WITH 18 DIGITS, 6 SYMBOLS AND CLOCK/TIMER Austria Mikro Systeme International Key Features General Description ❑ Very low operating current, typ. 30 µA @ 3V ❑ Low power oscillator using 32.768 kHz Xtal The AS2590 is an integrated CMOS device for driving a liquid crystal display intended for use in telephones. The ❑ 2-wire interface compatible to AS2574B ❑ 18 digits by 7 segments 2-wire serial interface is compatible to the dialler AS2574B. ❑ 6 symbols ❑ 24 hour clock showing hours and minutes The extreme low operating current allows the circuit to ❑ Timer automatically showing elapsed time in minutes and seconds after each telephone be operational also during on-hook which is necessary in order to the use of the clock function. In on-hook conversation ❑ 33 LCD segment outputs and 4 LCD backplane condition the circuit can be supplied by a small leakage current from the telephone line or from a small 3V outputs ❑ 4 times multiplex mode with a cycle time of 128 Hz battery. ❑ Mode select pin for selecting clock function Whether the oscillator shall continue operating or be stopped during on-hook is determined by the mode pin, MS. Package Available in 48 pin DIP and 52 pin PLCC. SPEECH CIRCUIT VDD VDD V13 AS2574A/B VLCD SDA 32.768kHz X1 X2 BIAS SCL Vss Rev. 1 AS2590 DIALLER CONTROLLER KEYBOARD MS V23 Vss 1 Dec. 1993 Data Sheet AS2590 Pin Description DIL PLCC Symbol 1 2 1 2 BP1 BP0 3 4 5 6 7 8 9 10 11 12 3 4 5 6 8 9 10 11 12 13 S0 S1 S2 S3 S4 S5 S6 S7 S8 S9 13 14 V1/3 1/3 of VDD pin for external voltage divider 14 15 16 17 18 19 20 21 22 23 15 16 17 18 19 21 22 23 24 25 S10 S11 S12 S13 S14 S15 S16 S17 S18 S19 Segment outputs 24 26 VSS Negative supply pin 25 26 27 28 BP3 BP2 Back plane outputs 27 29 V2/3 2/3 of VDD pin for external voltage divider 28 29 30 31 32 33 34 35 36 37 38 39 40 30 31 32 34 35 36 37 38 39 40 41 42 43 S32 S31 S30 S29 S28 S27 S26 S25 S24 S23 S22 S21 S20 Segment outputs 41 44 VLCD Negative supply pin for LC display Rev. 1 Function Blackplanes Segment outputs 2 Dec. 1993 Data Sheet AS2590 Pin Description Continued DIL PLCC Symbol 42 43 45 47 SDA SCL Serial data line input to dialler/controller Clock line input of serial data link 44 48 VBIAS Oscillator bias input, recommended bias resistor 2.2 MΩ 45 46 49 50 XTAL1 XTAL2 47 51 MS Mode select input: 48 52 VDD Positive supply pin LCD Layout SB3 Function Oscillator pins for 32.768 kHz crystal, a resistor and two capacitors SB1 D D D D D D 0 1 2 3 4 5 SB0 MS = VSS › clock/timer disabled MS = VDD › clock/timer enabled SB2 SB4 SB5 D D D D D D D D D D D D 6 7 8 9 10 11 12 13 14 15 16 17 Figure 1 SB0 = loudspeaker on (blinking with 1 Hz) Table 1 Segments Digits Digit Description SB1 = microphone muted (blinking with 1 Hz) 0 1 2 3 4 5 6 7 8 9 a b c d _ * # P/T r SB2 = 2nd key function enabled SB3 = number stored SB4 = number buffered in FIFO, not stored SB5 = colon for clock and timer (blinking when clock is shown) A F G E B C D Figure 2 Rev. 1 3 numbers 0…9 letter A letter B letter C Letter D underscore asterisk hash pause temp. MF recall Segment C D E on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on A B on on on on on on on on on on on on on on on on on on on F on G on on on on on on on on on on on on on on on on on on on on on on Dec. 1993 Data Sheet AS2590 Description - Power up; enables subsequent start timer commands. Operating Modes The following two operating modes are pin selectable: - BLANK ALL; clears the whole display (including special symbols) and displays the timer contents for 6 seconds (if clock/timer function is enabled) or until a new START TIMER/FIFO command is received. Then it returns to normal display mode. Mode 0: Clock and timer are disabled and the oscillator is stopped when going on-hook (command BLANK ALL). - if any command or data is received by the serial interface within the time out period after a BLANK ALL command, the timer display will be blanked or replaced by the clock display. Mode 1: Clock and timer functions are enabled, clock is displayed both during off- and on-hook (assuming that clock is set). When going from off-hook to on-hook, the timer content (elepsed time) is displayed for 6 seconds (assuming that a start timer command was received). The timer is displayed in the format mm:ss with the leading zero of the minutes suppressed and symbol 5 (:) turned on. Clock After a power up reset the clock is disabled. The clock will not be displayed until a valid set clock procedure has been performed (mode 1 only). The format of the clock is hh:mm and the leading zero of the hours is suppressed and symbol 5 (:) is blinking with a frequency of 1 Hz. The timer is running when off-hook and displayed for 6 seconds when going on-hook. The content of the timer (elapsed time) is shown in stead of the clock in the format mm:ss. LCD Outputs The 33 segment outputs and 4 backplane outputs can drive a customized liquid crystal display in 1:4 multiplex mode. Two reference voltages V1/3 and V2/3 are provided by an external voltage divider. Digits and Special Symbols The display consists of 18 seven segment digits and 6 special symbols (see figure 1): - D0…D17; D0 is the most left seven segment digit, the possible numbers displayed by one digit are shown in figure 2. The symbol (_) is only displayed at D13, D14, D16 and D17 when setting the clock. If a SET CLOCK command is received the display is blanked, four underscore symbols are displayed where the 4 digits of the clock will be entered (the 4 most right digits) and symbol 5 is turned on (_ _ : _ _). The next 4 data words are interpreted as the time (hh mm). The fourth digit terminates the SET CLOCK and starts the clock with the seconds set to zero. - SB0…SB5; 6 special symbols (one segment for each symbol only), see figure 1 for reference. If SB0 (loudspeaker on) or SB1 (microphone muted) are turned on, they blink with a frequency of 1 Hz. If less than 4 data words (digits) are received the first command (normally a BLANK DIGITS or a BLANK ALL) will terminate the SET CLOCK. But as the procedure was incomplete, it is regarded as invalid and further clock display is disabled. The next valid SET CLOCK command will enable the clock again. The SET CLOCK command does not effect the timer. Multiplex Mode A total of 132 segments are addressable. One output drives 4 segments in a time multiplex mode. The 4 backplane outputs determine the currently addressed segment (see figure 3). Figure 3 gives the correlation between segment outputs and addressed segments. The time-out condition (approx. 15 seconds) when setting clock is recognized by the dialler/controller (e.g. AS2574). If a time-out condition occours the dialler sends a BLANK ALL command to terminated the SET CLOCK. Data and Commands 32 different words may be received via the serial interface. 19 words are interpreted as display data for one of the 18 seven segment digits. Table 2 gives the translation from received code to displayed symbol. Timer The following commands effect the timer: - START TIMER and START FIFO; they start the timer. If the timer is already running, it cannot be restarted by one of these commands before stopping the timer with the BLANK ALL command. Rev. 1 13 words are valid commands codes. The function of each command is described in table 2, and table 4 lists the 5 bit codes for all possible commands. 4 Dec. 1993 Data Sheet AS2590 Table 2 Command Summary NO MNEMONIC FUNCTION 1 2 SET LS CLEAR LS Turns on special symbol SB0 (loudspeaker on, blinking) Turns off special symbol SB0 3 4 SET MUTE CLEAR MUTE Turns on special symbol SB1 (microphone muted, blinking) Turns off special symbol SB1 5 6 SET 2ND CLEAR 2ND Turns on special symbol SB2 (2nd function on keyboard) Turns off special symbol SB2 7 8 SET CLOCK START Initiates clock setting; SB5 is turned on Blanks all digits, SB3 and SB4; accepts data, timer not started 9 START COPY Blanks all digits and SB4; turns on SB3, accepts data, timer not started (if not already running) 10 START FIFO Blanks all digits and SB3; turns on SB4, accepts data, timer started (if not already running) 11 START TIMER Blanks all digits, turns off SB3 and SB4, accepts data, timer started (if not already running) 12 BLANK ALL Blanks all digits and all special symbols (except D13, D14, D16, D17 and SB5 when clock is running) 13 TEST MODE Turns circuit into test mode Table 3 Segment Mapping SEGMENT OUTPUT S0 S1 BP0 SB0 D0/F BACKPLANE BP1 BP2 SB1 SB4 D0/G D0/E BP3 SB2 D0/D SEGMENT OUTPUT S17 S18 BP0 D9/F D9/A BACKPLANE BP1 BP2 D9/G D9/E D9/B D10/G BP3 D9/C D10/E S2 S3 D0/A D1/F D0/B D1/G D0/C D1/E D1/D D1/C S19 S20 D10/A D11/A D10/F D11/F D10/B D11/E D10/C D10/D S4 S5 D1/A D2/A D1/B D2/F D2/G D2/B D2/E D2/C S21 S22 D11/B D12/F D11/G D12/G D11/C D12/E D11/D D12/D S6 S7 D3/A D3/B D3/F D3/G D2/E D3/C D2/D D3/D S23 S24 D12/A D13/F D12/B D13/G D12/C D13/E D13/D D13/C S8 S9 D4/F D4/A D4/G D4/B D4/E D4/C D4/D D5/D S25 S26 D13/A D14/A D13/B D14/F D14/G D14/B D14/E D14/C S10 S11 D5/F D5/A D5/G D5/B D5/E D6/G D5/C D6/E S27 S28 D15/A D15/B D15/F D15/G D15/E SB5 D14/D D15/D S12 S13 D6/A D7/A D6/F D7/F D6/B D7/E D6/C D6/D S29 S30 D16/F D16/A D16/G D16/B D16/E D16/C D16/D D17/D S14 S15 D7/B D8/F D7/G D8/G D7/C D8/E D7/D D8/D S31 S32 D17/F D17/A D17/G D17/B D17/E D15/C D17/C SB3 S16 D8/A D8/B D8/C D9/D Dn/m = segment m of digit n SBn = special symbol n Rev. 1 5 Dec. 1993 Data Sheet BP0 AS2590 to high transition of the data line while the clock line is high followed by a negative clock pulse indicates a stop condition (see figure 4). Active Backplane BP1 BP2 BP3 VDD V2/3 V1/3 Vss BP0 Table 4 Codes for Serial Interface VDD V2/3 V1/3 Vss BP1 NO SYMBOL MSB 1 SB0-on 0 2 SB0-off 0 VDD V2/3 V1/3 Vss BP2 VDD V2/3 V1/3 Vss BP3 off VDD V2/3 V1/3 Vss on VDD V2/3 V1/3 Vss S0 on off off S1 off on on Figure 3 LCD driver outputs Serial Interface The serial interface is a one way, two line link between the dialler (AS2574) and the display driver. The two lines are the serial data line (SDA) and the serial clock line (SCL). The display driver can only receive data. Word Transfer: Data are transferred as 5 bit words with start and stop bit. the least significant bit is sent first after the start bit. As long as there is no data transfer, both data and clock lines have to remain high. Also between two words both lines have to stay high for a specified time. Figure 4 shows the timing of the serial interface. Start and Stop Conditions: A start condition is detected when the data line goes from high to low while the clock line is held high. A low B3 0 0 B2 1 0 B1 0 1 LSB HEX 1 05 1 03 3 4 SB1-on SB1-off 1 0 0 1 0 0 0 0 1 1 11 09 5 6 SB2-on SB2-off 0 1 0 1 1 1 1 1 1 1 07 1F 7 8 SET CLOCK START 0 0 1 1 0 1 1 0 1 1 0B 0D 9 10 COPY FIFO 0 1 1 0 1 0 1 1 1 1 0F 13 11 12 TIMER BLANK 1 1 0 1 1 1 0 0 1 1 15 1D 13 14 TEST 0 1 1 0 1 1 1 1 0 1 0 17 1C 15 16 1 2 0 0 0 0 0 1 0 0 0 0 00 04 17 18 3 4 0 1 0 0 0 0 1 0 0 0 02 10 19 20 5 6 1 1 0 0 1 0 0 1 0 0 14 12 21 22 7 8 0 0 1 1 0 1 0 0 0 0 08 0C 23 24 9 a 0 0 1 0 0 1 1 1 0 0 0A 06 25 26 b c 1 0 0 1 1 1 1 1 0 0 16 0E 27 28 d * 1 1 1 1 1 0 1 0 0 0 1E 18 29 30 # – 1 1 1 1 0 0 1 1 0 1 1A 1B 31 32 P/T r 1 0 1 0 0 0 0 0 1 1 19 01 SDA SCL START #1 LSB B0 B1 B2 B3 MSB B4 STOP #1 WORD START GAP #2 Figure 4 Interface Timing Rev. 1 6 Dec. 1993 Data Sheet AS2590 Electrical Characteristics Absolute Maximum Ratings Positive Supply Voltage ...................................................................................................................-0.3V ≤ VDD ≤ 7V Input Current ................................................................................................................................................± 25 mA Digital Input Voltage .....................................................................................................VSS - 0.3V ≤ VIN ≤ VDD + 0.3V Electrostatic Discharge (HBM) ........................................................................................................................±500V Storage Temperature ......................................................................................................................-65°C to +125°C Recommended Operating Conditions Supply Voltage ..............................................................................................................................2.5V ≤ VDD ≤ 5.5V Oscillator Frequency ...............................................................................................................................32.768 kHz Operating Temperature ....................................................................................................................- 25°C to +70°C DC Characteristics (Default conditions: recommended operating conditions; outputs unloaded; VDD = 3.0V) Symbol Parameter Conditions Min Typ Max Units 1.5 µA 50 µA Test circuit fig. 5 IDD0 Standby Current no clock running IDD Operating Current TAMB = 5 to 55 °C 30 Note 1, note 2 VIL Input Voltage, Low VSS 0.2 VDD V VIH Line Voltage, High 0.8 VDD VDD V VLCD Output Voltage, Sink 0.4 V RBIAS Oscillator Bias Resistor ILCD = 4.8 mA 2.2 MΩ Note 1: Segment and backplane outputs loaded with maximum 30 pF, power consumption of external voltage divider not included, RBIAS = 2.2 MΩ ± 10%. Note 2: Xtal parameters: Rev. 1 Rimax = 60 kΩ (Rityp = 30 kΩ) Qmin = 35 000 Co = 1.5 pF (capacitance across Xtal terminals) fxtal = 32.768 kHz 7 Dec. 1993 Data Sheet AS2590 AC Characteristics (VDD = 3.0V; TAMB = -25 to 70 °C, unless otherwise specified) Symbol Parameter Conditions Min Typ SDA/SCL Serial Interface Fig. 5 fCL Clock Frequency 10 kHz fCLH Clock High Time 50 µs fCLL Clock Low Time 50 µs fCD Clock Low to Data Change fSOH Stop Bit High Time 50 µs fSOL Stop Bit Low Time 50 µs fHD Data Hold Time 200 ns fSUSO Clock Setup for Stop 200 ns fHSA Clock Hold for Start 200 ns fGAP Data High between 2 Words BP0…3 Back Plane Outputs tBRON Rise Time, on 20 µs tBFON Fall Time, on 20 µs tBROF Rise Time, off 20 µs tBFOF Fall Time, off 20 µs tBC Cycle Frequency S0…32 Segment Outputs tSRON Rise Time, on 20 µs tSFON Fall Time, on 20 µs tSROF Rise Time, off 20 µs tSFOF Fall Time, off 20 µs tSC Cycle Frequency tTIMER Timer Display Time Note 3 tXUP Oscillator Startup Time RBIAS = 2.2 MΩ 20 Max Units tCLL ns µs 100 Figure 6, note 1 128 Hz Figure 7, note 2 128 5 Hz 6 sec 300 ms Note 1: Loads on backplanes = 3 000 pF//10 MΩ Note 2: Loads on segments = 360 pF//1 MΩ Note 3: After BLANK ALL command and timer has been started with a valid start command, timer content is displayed. Rev. 1 8 Dec. 1993 Data Sheet AS2590 Timing Diagrammes tHSA tCD tHD SDA tCLH tCLL SCL START BIT 1 BIT 0 tSUSO tSOH … tGAP SDA tCLL tSOL SCL BIT 4 STOP WORD GAP… Figure 5 Serial Interface timing waveforms Rev. 1 9 Dec. 1993 Data Sheet AS2590 Output Waveforms tBC tBRON tBC tBFON VDD 0.9 VDD tBROF tBROF 0.1 VDD Vss Figure 6 Backplane timing waveforms tSC tSFON tSRON tSC VDD 0.9 VDD tSFOF tSFOF 0.1 VDD Vss Figure 7 Segment timing waveforms Rev. 1 10 Dec. 1993 Data Sheet AS2590 Pin Configurations 48 Pin DIP 48 VDD BP0 2 47 MS S0 3 46 XTAL2 S1 4 45 XTAL1 S2 5 44 VBIAS S3 6 43 S4 7 42 SCL SDA S5 8 41 VLCD S6 S7 9 40 39 S20 S21 S8 11 38 S22 S9 37 S23 V1/3 12 13 36 S24 S10 14 35 S25 S11 15 34 S26 S12 16 33 S27 S13 17 32 S28 S14 18 31 S29 S15 19 30 S30 S16 20 29 S31 S17 21 28 S32 S18 22 27 V2/3 S19 23 26 BP2 Vss 24 25 BP3 Rev. 1 10 S4 S5 S6 S7 S8 S9 V1/3 S10 S11 S12 S13 S14 NC 1 14 AS2590 40 27 NC SDA VLCD S20 S21 S22 S23 S24 S25 S26 S27 S28 S29 S15 S16 S17 S18 S19 VSS BP3 BP2 V2/3 S32 S31 S30 NC 1 AS2590 BP1 NC S3 S2 S1 S0 BP0 BP1 VDD MS XTAL2 XTAL1 VBIAS SCL 52 pin PLCC Ordering Information: 48 pin DIP: 52 pin PLCC: AS2590 P AS2590 N Applications: For application support contact your local AMS sales offices. 11 Dec. 1993 Data Sheet AS2590 Sales Representative Devices sold by Austria Mikro Systeme are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. Austria Mikro Systeme 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. Austria Mikro Systeme 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 Austria Mikro Systeme 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 Austria Mikro Systeme for each application. Copyright 1993, Austria Mikro Systeme International AG, Schloss Premstätten, 8141 Unterpremstätten, Austria. 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. The information furnished here by Austria Mikro Systeme is believed to be correct and accurate. However, Austria Mikro Systeme 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 Austria Mikro Systeme rendering of technical or other services. Rev. 1 12 Dec. 1993