AS2591 AS2525 AN525 D-81539 F-94300 I-20146 CH-8640 - Datasheet Archive

 

16-Digit LCD Driver CMOS Integrated Circuit AS2591 DATA SHEET Key Features - General Description 16-digit LCD driver on a 44 pin

 

austriamicrosystems 16-Digit LCD Driver CMOS Integrated Circuit AS2591 AS2591 DATA SHEET Key Features - General Description 16-digit LCD driver on a 44 pin CMOS chip Operating voltage range: 3.2 to 4.8V Low power consumption: max. 150 µA Driving 7-segment displays with up to 16 digits and 12 symbols Option for 12 digits Buffer for 32 digits 4 backplanes 2-wire interface On chip timer for showing elapsed time Contrast adjustable On chip oscillator using 32.768 kHz crystal Compatible with AS2525 AS2525 Package The AS2591 AS2591 is a CMOS integrated circuit for driving a liquid crystal display intended for use in telephones. The driver can be used with 12- or 16-digit LCDs. The 2-wire serial interface is compatible with the AS2525 AS2525, single-chip handsfree telephone circuit. The device is designed for LCDs with 4 backplanes and 24 or 31 segments providing 12 or 16 7-segment digits and 12 symbols. The AS2591 AS2591 also includes a timer for showing elapsed time in minutes and seconds. The contrast can be adjusted through the serial interface. Available in 44 pin TQFP. Block Diagram VDD POR SCLK SERIAL I/F COM1-4 7SEGMENT DECODER LCD DIGIT MEMORY CS DATA 32 DIGITS COMMAND ADDRESS DECODER CONTROL SEGMENT MULTIPLEXER DI 4 BACKPLANE COUNTER 16 16 S1_n S2_n 32.768 kHz OSC ELAPSE TIME COUNTER TIMER VLCD CONTRAST VOLTAGE CONTROL AS2591 AS2591 Figure 1: Block diagram Revision 2.0 Page 1 of 12 austriamicrosystems Data Sheet AS2591 AS2591 Pin Description Pin # Name Type 1 2 3 4 5 6 7 8 9 10 11 12 S2_10 S1_10 S2_11 S1_11 S2_12 S1_12 S2_13 S1_13 S2_14 S1_14 S2_15 S1_15 AO 13 CS DI Description S egment Outputs Output pins for driving segments of LCD. C hip S elect Chip select signal from CPU (e.g. AS2525 AS2525). 14 DI DI D ata I nput Data input pin for serial interface. 15 SCLK DI S erial Cl oc k Input Clock input pin for serial interface. 16 V DD Supply V oltage D rain D rain This pin is the positive power supply for the device. 17 V SS Supply V oltage S ource S ource This pin is the negative power supply for the device. 18 19 XTAL1 XTAL2 20 V LCD Oscillator Pins Oscillator pins for connection of a 32.768 kHz crystal. AI LCD Reference V oltage This is the input pin for setting the internal LCD reference voltage (see also Figure 3: Supply arrangement). 21 22 23 24 Revision 2.0 COM1 COM2 COM3 COM4 AO Backplane Outputs Output pins for driving backplanes of LCD. Page 2 of 12 austriamicrosystems Data Sheet AS2591 AS2591 Pin # Name Type 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 S2_0 S1_0 S2_1 S1_1 S2_2 S1_2 S2_3 S1_3 S2_4 S1_4 S2_5 S1_5 S2_6 S1_6 S2_7 S1_7 S2_8 S1_8 S2_9 S1_9 AO DI: DO: DI/O: Revision 2.0 Digital Input Digital Output Digital Input/Output Description S egment Outputs Output pins for driving segments of LCD. AI: AO: AI/O: Analogue Input Analogue Output Analogue Input/Output Page 3 of 12 austriamicrosystems Data Sheet AS2591 AS2591 Typical Application Figure 2: Typical Application See also application note AN525 AN525 for further information. Revision 2.0 Page 4 of 12 austriamicrosystems Data Sheet AS2591 AS2591 This voltage can be programmed through the serial bus to 2.83V (low) or 3.09V (high) for optimizing the contrast of the LCD. The 1/3, 2/3, and 3/3 voltages are generated internally (see Figure 3: Supply arrangement). In applications with varying V DD , it is recommended to insert a voltage regulator at V LCD in order to assure a constant contrast (see also application note AN525 AN525 for further information). Functional Description AS2591 AS2591 is a CMOS mixed-mode integrated circuit for driving LCDs with 4 backplanes and 24 or 31 segments providing 12 or 16 7-segment digits and 12 symbols. The device is controlled via a simple 2-wire bus and a chipselect signal. The device also includes an elapse-time counter which is started 5 seconds after power-up and incremented every second. VDD From AS2525 AS2525 The timer is re-started whenever the device gets a WRITEDIGIT or SHIFT&WRITE command within the first 5 counts (except commands for displaying digits "-", " o ", "o"). The content of the timer is displayed 5 second after receiving the last WRITE-DIGIT, SHIFT&WRITE or BLINKING command. The normal display appears immediately after receiving a WRITE-DIGIT, SHIFT&WRITE, or BLINKING command. VDD VLCD VSS Contrast control Contrast control V33 V23 Supply Arrangement V13 The device is supplied through V DD . The internal reference voltages (V 33 , V 23 , and V 13 ) for the backplane and segment outputs are set at pin V LCD . With V LCD set to 3.27V the segment output voltage is 2.97V (middle). Figure 3: Supply arrangement LCD Digit Code Code [HEX]: 01 02 03 04 05 06 07 08 09 00 Number: 1 2 3 4 5 6 7 8 9 0 _ _| _| _ |_ |_| _ |_| |_| _ |_| _| _ |_| | _ |_ _| _ | | _ _| |_ | | |_| Display: | | Code [HEX]: 0A 0B 0C 0D 0E 0F 10 11 12 13 14 Letters/Signs: a b c d e f # * - ( ) Display: _ |_| | | |_ |_| _ |_ _| |_| _ |_ |_ _ |_ | Code [HEX]: 15 16 17 18 19 1A 1B 1C 1D 1E Letters/Signs: H I L N O P R T U Display: Revision 2.0 |_| | | | | |_ _ _ _ _ _ _ |_| _ | | |_| | | |_ _ | |_ |_ _ | |_ _ | _| 1F _ |_| |_| Page 5 of 12 austriamicrosystems Data Sheet AS2591 AS2591 LCD Symbols Each symbol is associated with a fixed digit address. The circuit has 12 symbols implemented associated with the lower 12 addresses. Table 1: Symbol Overview Enabled Address Name Description Always y0 KL Key lock activated Optional y1 SP Loudspeaker on Always y2 MT Mute activated Optional y3 MF DTMF dialing mode selected Optional y4 LD Loop disconnect (pulse) dialing mode selected Optional y5 Vol Volume control keys activated. Remains on 2 seconds after last volume key pressure Always y6 MR Memory redial key has been pressed. Remains on until next key pressure Always y7 BO Bell off. Indicates that ringer has been turn off. Always y8 SH Shift; indicates that shift key has been pressed. Remains on until next key pressure Optional y9 - Optional y10 RD Indicates that last number redial has been activated Always y11 PG Indicates program mode Not used Symbol data are not effected by a BLINKING or by a WRITE&SHIFT command. Symbols will be displayed independently from selecting the upper bank of the 32 digit buffer to be displayed. The symbol displayed depends on the layout of the LCD display. If the layout of the 12/16 digit LCD displays can be done similar, the symbol mapping does not need to be stored in the EEPROM. Serial Interface The serial interface uses the pins CS (chip select), SCLK (serial clock line), and DI (data input). A frame consists of a 3-bit command and 5-bit data (see Figure 4: Frame of serial interface). Commands are executed self-timed by the internal clock and commence at the falling edge of the CS signal. CS SCLK DI C3 C2 MSB C1 D4 D3 D2 D1 D0 LSB Figure 4: Frame of serial interface Revision 2.0 Page 6 of 12 austriamicrosystems Data Sheet AS2591 AS2591 Table 2: Commands Command [bin] Data [bin]/name 000 address 001 digit_code Write digit code to active address. 010 digit_code Shift & write digit code to address 0 (right most digit). Address pointer is set to 0. 011 1xBFS Description Set pointer to address. If address is > 16/12, the upper bank of the 32-digit buffer will be displayed. In case of a 12-digit display, up to address 23 will be displayed, and if address is > 24 a third bank up to 32 will be displayed (see Table 4: 12-digit display and Table 5: 16digit display). Blinking ON at address: BF blinking frequency S enabled/disabled 00 1.33 Hz 0 blinking 01 2.00 Hz 1 static off 10 0.67 Hz 11 1.00 Hz 0xxxx Blinking OFF at address 1xxxx Symbol ON at address 0xxxx Symbol OFF at address 00xxx Clear all digits, symbols, blinking, reset address to 0 10xxx Clear all digits, blinking, reset address to 0 01xxx Hide elapse time for 5 seconds. 11xxx Hide elapse time permanently (note: Hide is reset by above command 101 01xxx). 110 xxFTM Reserved for test modes 111 0xZxx Display OFF and Cleared. 100 101 Z 0 5 seconds 1 1CCND delay time no delay Display ON (resets the off timer) CC ND number of digits 00 low 00 12 digits 01 middle 01 16 digits 10 high 10 not allowed 11 Revision 2.0 contrast voltage not allowed 11 not allowed Page 7 of 12 austriamicrosystems Data Sheet AS2591 AS2591 COM1 - 4 = common backplane signals S1_n, S2_n = segment signals Digit Layout a b n = 0 is most right digit, n= 11 is most left digit for 12-digit displays, and n = 15 is most left digit for 16-digit displays. c f Table 3: Backplanes and segments g e d COM1 COM4 a f e yn S2_n Figure 5: Digit Layout COM3 S1_n yn COM2 b g c d Segment Allocation Table 4: 12-digit display Symbol y11 y10 y9 y8 y7 y6 y5 y4 y3 y2 y1 y0 AS2525 AS2525 PG RD - SH BO MR Vol LD MF MT SP KL Normal 11 10 9 8 7 6 5 4 3 2 1 0 Upper 1 Digits Address 23 22 21 20 19 18 17 16 15 14 13 12 31 30 29 28 27 26 25 24 Upper 2 Table 5: 16-digit display Symbol Addr. y11 y10 y9 y8 y7 y6 y5 y4 y3 y2 y1 y0 AS2525 AS2525 PG RD - SH BO MR Vol LD MF MT SP KL Digits Normal 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Digits Upper 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 The symbols in bold are always enabled and other symbols can be enabled through the serial interface. Symbols will be displayed independently from selecting the upper bank of the 32 digit buffer to be displayed. The AS2591 AS2591 incorporates a buffer for 32 digits. Digits are entered from the most right position and shifted left by new entries (see also Table 2: Commands). Revision 2.0 Page 8 of 12 austriamicrosystems Data Sheet AS2591 AS2591 Electrical Characteristics Absolute Maximum Ratings* -0.3 V DD 7V Supply Voltage Input Current +/- 25 mA Input Voltage -0.3V V IN V DD + 0.3V Electrostatic Discharge +/- 1000V Storage Temperature Range -65 to +125°C Total Power Dissipation 500mW *Exceeding these figures may cause permanent damage. Functional operation under these conditions is not permitted. Recommended Operating Range Symbol Parameter Conditions Min. Typ. Max. Units V DD Operating Voltage 3.2 4.0 4.8 V V LCD LCD Reference Voltage 2.5 3.0 3.5 V T AMB Ambient Operating Temp. Range -25 +70 °C f OSC Oscillator Frequency 32.768 kHz DC Characteristics Recommended operating conditions unless otherwise specified. Symbol Parameter Conditions I DD Operating Supply Current Idle Current Contrast Output Voltage at COM1-4 and S1-2_n Pins Max. Units 150 µA 1 Idle mode, oscillator not running V 33 Typ.* Unloaded I DD0 Min. µA V LCD = 3.27V Contrast voltage low Contrast voltage middle Contrast voltage high 2.83 2.97 3.09 V V V V IL Input Low Voltage V SS 0.3 V DD V V IH Input High Voltage 0.7 V DD V DD V * Typical figures are at 25°C and are for design aid only; not guaranteed and not subject to production testing. Revision 2.0 Page 9 of 12 austriamicrosystems Data Sheet AS2591 AS2591 Electrical Characteristics Recommended operating conditions unless otherwise specified. Symbol F LCD t OFF-TIMER Parameter Conditions Max. Units 64 67 Hz 4.75 Off Timer Typ. 61 LCD Frame Frequency Min. 5 5.25 sec f BLINK Blinking Frequency R COM Output Impedance of Backplane Outputs 150 kohm R SEG Output Impedance of Segment Outputs 150 kohm Revision 2.0 BF BF BF BF = = = = 00 01 10 11 1.33 2.00 0.67 1.00 Hz Hz Hz Hz Page 10 of 12 austriamicrosystems Data Sheet AS2591 AS2591 Packaging Ordering Information Number Package Description AS2591 AS2591 Q TQFP plastic thin quad flat package ­ 44 leads (suffix T) Marking, Pin-out AS2591 AS2591 F DOF Dice-on-Foil S1_9 S2_9 S1_8 S2_8 S1_7 S2_7 S1_6 S2_6 S1_5 S2_5 S1_4 44-in plastic TQFP (suffix Q) For exact mechanical package dimensions please see austriamicrosystems AG packaging information. 1 6 39 YYWWAAA AS2591x 28 Austria 17 S1_15 CS DI SCLK VDD VSS XTAL1 XTAL2 VLCD COM1 COM2 S2_10 S1_10 S2_11 S1_11 S2_12 S1_12 S2_13 S1_13 S2_14 S1_14 S2_15 S2_4 S1_3 S2_3 S1_2 S2_2 S1_1 S2_1 S1_0 S2_0 COM4 COM3 Devices sold by austriamicrosystems AG are covered by the warranty and patent identification 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. Copyright YY WW AAA year of production calendar week of production austriamicrosystems AG assembly ID X revision Copyright © 1997-2002, austriamicrosystems AG, Schloss Premstaetten, 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. 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. Revision 2.0 Page 11 of 12 austriamicrosystems Data Sheet AS2591 AS2591 Contact Headquarters austriamicrosystems AG accento! Business Unit Communications A 8141 Schloss Premstätten, Austria T. +43 (0) 3136 500 0 F. +43 (0) 3136 525 01 accento@austriamicrosystems.com www.austriamicrosystems.com Sales Offices Germany USA (east) austriamicrosystems Germany GmbH Tegernseer Landstrasse 85 D-81539 D-81539 München, Germany Phone: +49/89/693643-0 Fax: +49/89/693643-66 austriamicrosystems USA, Inc. Suite 400, 8601 Six Forks Road Raleigh, NC 27615, USA Phone: +1/919/676 5292 Fax: +1/919/676 5305 France United Kingdom austriamicrosystems France S.a.r.l. 124, Avenue de Paris F-94300 F-94300 Vincennes, France Phone: +33/1/43 74 00 90 Fax: +33/1/43 74 20 98 austriamicrosystems UK, Ltd. Coliseum Business Centre, Watchmoor Park Camberley, Surrey, GU15 3YL, UK Phone: +44/1276/23 3 99 Fax: +44/1276/29 3 53 Italy Japan austriamicrosystems Italy S.r.l. Via Leone Tolstoi, 64 I-20146 I-20146 Milano, Italy Phone: +39/0242/36713 Fax: +39/0242/290889 austriamicrosystems AG Shin Yokohama Daini, Center Bldg. 10F 3-19-5, Shin Yokohama Kohoku-ku, Yokohama 222-0033, Japan Phone: +81/45/474 0962 Fax: +81/45/472 9845 Switzerland austriamicrosystems Switzerland AG Rietstrasse 4 CH-8640 CH-8640 Rapperswil, Switzerland Phone: +41/55/220 9000 Fax: +41/55/220 9001 USA (west) austriamicrosystems USA, Inc. Suite 116, 4030 Moorpark Ave, San Jose, CA 95117, USA Phone: +1/408/345 1790 Fax: +1/408/345 1795 Revision 2.0 Distributors & Representatives austriamicrosystems AG is represented by distributors in the following countries. Please contact your nearest regional sales office for the distributor address: Spain, Israel, Korea, Hong-Kong, Taiwan, Malaysia, Singapore, India, Brazil Application Support Please contact your local sales office or your distributor. Page 12 of 12