KS0071B 32COM/60SEG DRIVER & CONTROLLER FOR DOT MATRIX LCD INTRODUCTION The KS0071B is a dot matrix LCD controller & driver LSI which is fabricated by low power CMOS technology, designed to drive a split screen dot matrix LCD display of 1 line 24 characters or 2 line 24 characters with 57 dots format. FEATURES • • • Character type dot matrix single chip LCD controller & driver High voltage LCD driver 32 common and 60 segment signal output. Easy interface with a 4 bit or 8 bit MPU. • Internal memory -. Character generator ROM : 8400bits ( 240 characters for 57 dots ) -. Character generator RAM : 512 bits ( 8 patterns for 57 dots ) -. Display data RAM : 640 bits ( 808 bits for 80 characters ) • Maximum display characters -. 1 line, 1/16 duty, 57 dots + cursor, 24 characters. -. 2 line, 1/32 duty, 57 dots + cursor, 24 characters . • A customer character pattern can be programmable by mask option. •. The special character pattern can be programmable by character generator RAM directly. • It is possible to read both character generator and display data RAM from MPU. • Useful 11 code instruction set • Automatic power on reset function • On chip generation of LCD supply voltage from voltage doubler ( external supply also possible ) •.Voltage doubler generates about double from single power supply ( 5V) • High contrast display can be performed though the simple power supply circuits. • On chip oscillator requires external resistor ( external clock also possible ) • Power supply voltage: +5V10%, +3V20% • Supply voltage for display: -5V • Package outline: 118 TAB or bare chip available. KS0071B 32COM/60SEG DRIVER & CONTROLLER FOR DOT MATRIX LCD BLOCK DIAGRAM Parallel/ serial data Conversion circuit 5 60 bit shift register 5 60 Cursor blink control circuit 7 DB 0~ DB3 4 8 Data register (DR) 8 DB 4~ DB 7 4 Input output buffer R/W RS Character generator RAM (CG RAM) 512 bits Character generator ROM (CG ROM) 9600 bits Busy flag 8 60 7 7 8 E 8 60 bit latch circuit 60 Segment signal driver 60 Segment Signal ( S1 ~ S 60 ) Display data RAM (DD RAM) 640 bits Instruction register (IR) 8 Instruction decoder 7 V DD V1 V2 V3 V4 V5 V SS Address counter V DD V1 V2 V3 V4 V5 V SS 32 bit shift register Timing generation circuit Voltage doubler VCI C1 C 2 RC oscillator V 5OUT OSC1 OSC2 T1 T2 32 Common signal driver 32 Common Signal ( C 1 ~ C 32 ) KS0071B 32COM/60SEG DRIVER & CONTROLLER FOR DOT MATRIX LCD PAD DIAGRAM SEG17 SEG18 SEG19 SEG20 SEG21 SEG22 SEG23 SEG24 116 115 114 113 112 111 110 109 108 107 106 105 104 103 102 101 100 SEG25 SEG26 SEG27 SEG28 SEG29 SEG30 SEG31 SEG32 SEG33 SEG34 SEG35 SEG36 SEG37 SEG38 SEG39 SEG40 SEG41 SEG42 SEG43 SEG44 118 117 99 98 97 96 95 94 93 92 91 SEG45 1 90 SEG16 SEG46 2 89 SEG15 SEG47 3 88 SEG14 SEG48 4 87 SEG13 SEG49 5 86 SEG12 SEG50 6 85 SEG11 SEG51 7 84 SEG10 SEG52 8 83 SEG9 SEG53 9 82 SEG8 SEG54 10 81 SEG7 SEG55 11 80 SEG6 SEG56 12 79 SEG5 SEG57 13 78 SEG4 SEG58 14 77 SEG3 SEG59 15 76 SEG2 SEG60 16 75 SEG1 COM9 17 74 C0M1 COM10 18 73 C0M2 COM11 19 CHIP SIZE : 3920 5080 72 C0M3 COM12 20 PAD SIZE : 100 100 71 C0M4 COM13 21 70 C0M5 COM14 22 UNIT : 69 C0M6 COM15 23 68 C0M7 COM16 24 67 C0M8 COM25 25 66 C0M17 COM26 26 65 C0M18 COM27 27 64 C0M19 COM28 28 63 C0M20 COM29 29 62 C0M21 COM30 30 61 C0M22 COM31 31 60 C0M23 COM32 32 59 C0M24 KS0071B KS0071 Y X ( 0.0 ) 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 T1 T2 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 E RW RS VDD VCI C2 C1 V5OUT V5 V4 V3 V2 V1 OSC2 OSC1 VSS * *“KS0071B” to to find PAD 95 No. 95 "KS0071"Marking Marking: easy : easy find theNo. PAD KS0071B 32COM/60SEG DRIVER & CONTROLLER FOR DOT MATRIX LCD PAD LOCATION PAD NO. PAD Name UNIT :( ) Coordinate X Y PAD NO. PAD Name Coordinate X Y PAD NO. PAD Name Coordinate X Y PAD NO. PAD Name Coordinate X Y 1 SEG45 -1794 2170 33 VSS -1564.5 -2374 65 COM18 1794 -1330 97 SEG23 936 2374 2 SEG46 -1794 2030 34 OSC1 -1437.5 -2374 66 COM17 1794 -1190 98 SEG24 811 2374 3 SEG47 -1794 1890 35 OSC2 -1312.5 -2374 67 COM8 1794 -1050 99 SEG25 686 2374 4 SEG48 -1794 1750 36 -1187.5 -2374 68 COM7 1794 -910 100 SEG26 561 2374 V1 5 SEG49 -1794 1610 37 V2 -1062.5 -2374 69 COM6 1794 -770 101 SEG27 436 2374 6 SEG50 -1794 1470 38 V3 -937.5 -2374 70 COM5 1794 -630 102 SEG28 311 2374 7 SEG51 -1794 1330 39 V4 -812.5 -2374 71 COM4 1794 -490 103 SEG29 186 2374 8 SEG52 -1794 1190 40 V5 -687.5 -2374 72 COM3 1794 -350 104 SEG30 61 2374 9 SEG53 -1794 1050 41 V5OUT -562.5 -2374 73 COM2 1794 -210 105 SEG31 -64 2374 10 SEG54 -1794 910 42 C1 -437.5 -2374 74 COM1 1794 -70 106 SEG32 -189 2374 11 SEG55 -1794 770 43 C2 -312.5 -2374 75 SEG1 1794 70 107 SEG33 -314 2374 12 SEG56 -1794 630 44 VCI -187.5 -2374 76 SEG2 1794 210 108 SEG34 -439 2374 13 SEG57 -1794 490 45 VDD -62.5 -2374 77 SEG3 1794 350 109 SEG35 -564 2374 14 SEG58 -1794 350 46 RS 62.5 -2374 78 SEG4 1794 490 110 SEG36 -689 2374 15 SEG59 -1794 210 47 RW 187.5 -2374 79 SEG5 1794 630 111 SEG37 -814 2374 16 SEG60 -1794 70 48 E 312.5 -2374 80 SEG6 1794 770 112 SEG38 - 939 2374 17 COM9 -1794 -70 49 DB0 437.5 -2374 81 SEG7 1794 910 113 SEG39 -1064 2374 18 COM10 -1794 -210 50 DB1 562.5 -2374 82 SEG8 1794 1050 114 SEG40 -1189 2374 19 COM11 -1794 -350 51 DB2 687.5 -2374 83 SEG9 1794 1190 115 SEG41 -1314 2374 20 COM12 -1794 -490 52 DB3 812.5 -2374 84 SEG10 1794 1330 116 SEG42 -1439 2374 21 COM13 -1794 -630 53 DB4 937.5 -2374 85 SEG11 1794 1470 117 SEG43 -1564 2374 22 COM14 -1794 -770 54 DB5 1062.5 -2374 86 SEG12 1794 1610 118 SEG44 -1689 2374 23 COM15 -1794 -910 55 DB6 1187.5 -2374 87 SEG13 1794 1750 24 COM16 -1794 -1050 56 DB7 1312.5 -2374 88 SEG14 1794 1890 25 COM25 -1794 -1190 57 T2 1437.5 -2374 89 SEG15 1794 2030 26 COM26 -1794 -1330 58 T1 1562.5 -2374 90 SEG16 1794 2170 27 COM27 -1794 -1470 59 COM24 1794 -2170 91 SEG17 1686 2374 28 COM28 -1794 -1610 60 COM23 1794 -2030 92 SEG18 1561 2374 29 COM29 -1794 -1750 61 COM22 1794 -1890 93 SEG19 1436 2374 30 COM30 -1794 -1890 62 COM21 1794 -1750 94 SEG20 1311 2374 31 COM31 -1794 -2030 63 COM20 1794 -1610 95 SEG21 1186 2374 32 COM32 -1794 -2170 64 COM19 1794 -1470 96 SEG22 1061 2374 KS0071B 32COM/60SEG DRIVER & CONTROLLER FOR DOT MATRIX LCD PAD DESCRIPTION PAD ( No.) VDD ( 45 ) VSS ( 33 ) OSC1 ( 34 ) OSC2 ( 35 ) E (48) R/W ( 47 ) NAME Power Supply I/O Input Oscillator Input output Enable Read / write Input Input Description For logical circuit (+5V10%,+3V20%) 0V (GND) OSC1 and OSC2 pin should be connected to external Rf resistor for internal oscillator. External clock can be input to OSC1. Start enable signal to read or write the data R/W signal input is used to select the read/write mode High Low RS ( 46 ) Register select Input Low Resistor or external clock MPU MPU Read mode Write mode Register select input. High Interface Power supply MPU Data register (for read and write) Instruction register (for write) busy flag, address counter (for read) DB0 ~ DB7 ( 49 ~ 56 ) Data interface Input/ output VCI ( 44 ) Voltage doubler output Capacitor Input Voltage doubler output LCD supply Voltage Segment output Output Output Segment signal output for LCD driving LCD Common output Output Common signal output for LCD driving LCD Input Maker testing terminal (normally open) C1 ( 42 ) C2 ( 43 ) V5OUT ( 41 ) V1,V2,V3,V4,V5 ( 36 ~ 40 ) S1 ~ S44 ( 75~118) S45 ~ S60 (1 ~ 16 ) C1 ~ C8 (74 ~ 67) C9 ~ C16 (17~24) C17 ~ C24 (66~59) C25 ~ C32 (25~32) T1(58),T2(57) Test pin Input Input Used for data transfer between the MPU and KS0071B, These terminals are for data bus with bidirectional three-state. lower 4 bit (DB0 ~ DB3) are not used during 4 bit operation (DB7 can be used as a busy flag. ) Input terminal for voltage doubler. (normally VCI=VDD) Capacitor for voltage doubler connecting terminal (+). Capacitor for voltage doubler connecting terminal(-). Voltage doubler output terminal connected to LCD supply voltage Bias voltage level for LCD driving MPU Power supply Capacitor V5 Divide resistor KS0071B 32COM/60SEG DRIVER & CONTROLLER FOR DOT MATRIX LCD MAXIMUM ABSOLUTE LIMIT Description Operating Voltage Driver Supply Voltage Input Voltage Power Dissipation Operating Temperature Storage Temperature Symbol VDD V1 ~ V5 VIN PD TOPR TSTG Value - 0.3 ~ + 7.0 VDD- 13.5 ~ VDD + 0.3 - 0.3 ~ VDD + 0.3 500 - 30 ~ + 85 - 55 ~ + 125 Unit mW . Voltage greater than above may damage the circuit . The voltage relation : VDDVCIV5V5OUT, VDDVSSV5OUT, VSS = 0V ELECTRICAL CHARACTERISTICS DC Characteristics Characteristic Operating voltage Supply current (*1) Input voltage 1 Symbol VDD IDD High Low High Low High Low High Low COM SEG VIH1 VIL1 VIH2 VIL2 VOH1 VOL1 VOH2 VOL2 VdCOM VdSEG IIL1 IIL2 IIN Internal Frequency (*3) External Frequency clock Duty (*4) Rise, Fall Voltage Output Voltage doubler Voltage (*5) conv. rate Input Voltage LCD driving voltage(*6) fIc fEC duty tr, tf V5OUT Input voltage 2 Output voltage 1 Output voltage 2 Voltage drop (*2) Input Leakage Current Low Input Current VEF VCI VLCD ( VDD = +5V10%, VSS = 0V, Ta = -30 ~ +85 ) Condition Min Typ Max Unit Applicable pin 4.5 5.0 5.5 V Internal oscillation or 0.6 1.0 mA external clock VDD=5V fOSC=270KHz 2.3 VDD E, DB0 ~ DB7, 0.8 V R/W, RS VDD-1 VDD OSC1 1.0 IOH=-0.205mA 2.4 DB0 ~ DB7 IOL=1.6mA 0.4 V IO=-40uA 0.9VDD OSC2 IO=40uA 0.1VDD 1 V COM1 ~ COM32 IO=0.1mA 1 SEG1 ~ SEG60 VIN=0V or VDD -1 1 E VIN=VDD -5 5 uA RS, R/W, DB0~DB7 VIN=0V, VDD=5V -50 -125 -250 (Test pull up R) 190 270 350 KHz OSC1,OSC2 Rf=91k2% 160 250 350 OSC1 45 50 55 % 0.2 -2.8 -3.9 V V5OUT IOUT=5mA, Ta=25 IOUT=1mA, Ta=25 RL= VLCD-V5 1/5 bias 1/6.7 bias -4.5 95 2.5 -4.7 99.9 - 5.5 3.0 3.0 - 13.5 13.5 % V VCI V V1~V5 KS0071B 32COM/60SEG DRIVER & CONTROLLER FOR DOT MATRIX LCD ( VDD = +3V20%, VSS = 0V, Ta = -30 ~ +85 ) DC Characteristics (continued) Characteristic Operating Voltage Supply Current (*1) Input Voltage 1 Input Voltage 2 Output Voltage 1 Output Voltage 2 Voltage Drop (*2) High Low High Low High Low High Low COM SEG Input Leakage Current Input Low Current Internal Clock Frequency (*3) Voltage Output doubler Voltage (*5) Voltage conv. rate Input voltage LCD driving voltage(*6) Symbol VDD IDD VIH1 VIL1 VIH2 VIL2 VOH1 VOL1 VOH2 VOL2 VdCOM VdSEG IIL1 IIL2 IIN fic V5OUT VEF VCI VLCD Condition Internal oscillation or external clock VDD=3V fOSC=240 KHz IOH=-0.205mA IOL=1.6mA IO=-40uA IO=40uA IO=0.1mA Min 2.4 - Typ 3.0 0.2 Max 3.6 0.3 Unit V mA 0.8VDD VDD-1 2.0 0.9VDD -1 -5 -10 -25 VDD 0.2VDD VDD 1.0 0.5 0.1VDD 1 1 1 5 -50 V 160 -2.5 240 -2.75 320 - KHz V RL= 95 99.9 - % - 1.8 3.0 - VDD 12 V VIN=0V or VDD VIN=VDD VIN=0V, VDD=3V (Test pull up R) Rf=91k2% IOUT=1mA, Ta=25 VDD - V5 NOTE: *1) Applies to the current value flowing through VDD under the following conditions ( all input level must be fixed to ‘H’ or ‘L’ ) * 2) Applies to COM voltage DROP (Vdcom ) occurring from terminals VDD, V1,V4 and V5 to each common terminal ( COM1 ~ COM32 ), and also to SEG voltage drop ( VdSEG) occurring from terminals VDD, V2,V3 and V5 to each segment terminal ( SEG1 ~ SEG60). * 3) Internal clock * 4) External clock OSC1 Clock OSC1 Rf = 91 2% OSC2 Open OSC2 Applicable pin E, DB0 ~ DB7, R/W, RS OSC1 DB0 ~ DB7 V OSC2 V uA COM1 ~ COM32 SEG1 ~ SEG60 E RS, R/W, DB0~DB7 OSC1,OSC2 V5OUT VCI V1~V5 KS0071B 32COM/60SEG DRIVER & CONTROLLER FOR DOT MATRIX LCD * 4) Voltage doubler measuring circuit * 5) Supply current measuring circuit + 5V + 5V A VDD + VC1 V DD C1 + C2 - DB 0-7 4.7uF VSS (*3, *4) - 10uF + (4.7uF) C1 OSC1 OSC1 A V5OUT V CI + - RS,RW - + 4.7uF C2 V5 RL = 10 (3) E V SS 0V V 5OUT 10uF + ( ) = + 3V Operation * 6) LCD driving voltage V1, V2, V3,V4, V5 ( VLCD = VDD - V5 ) Power VDD (COM / SEG select voltage) Duty 1/16 duty 1/32 duty Bias 1/5 bias 1/6.7 bias VDD VDD V1 (COM non select voltage) VDD-(1/5) VLCD VDD-(1/6.7) VLCD V2 (SEG non select voltage) VDD-(2/5) VLCD VDD-(2/6.7) VLCD V3 ( SEG non select voltage) VDD-(3/5) VLCD VDD-(4.7/6.7) VLCD V4 (COM non select voltage) VDD-(4/5) VLCD VDD-(5.7/6.7) VLCD VDD-VLCD VDD-VLCD V5 (COM / SEG select voltage) KS0071B 32COM/60SEG DRIVER & CONTROLLER FOR DOT MATRIX LCD AC Characteristics (1) Write mode ( VDD = 5V10%, VSS = 0V , Ta = -30 ~ +85 Symbol tc tR, tF tW tSU1 tH1 tSU2 tH2 Min 500 220 40 10 60 10 Typ - Description Cycle Time Rise Time / Fall Time Pulse Width ( High, Low ) R/W And RS Set-Up Time R/W And RS Hold Time Data Set-Up Time Data Hold Time Symbol tC tR, tF tW tSU1 tH1 tSU2 tH2 Min 1400 500 70 10 195 10 ( VDD = 3V20%, VSS = 0V , Ta = -30 ~ +85 ) Typ Max Unit Test Pin ns E 20 ns E ns E ns R/W, RS ns R/W, RS ns DB0 ~ DB7 ns DB0 ~ DB7 RS Max 20 - Unit ns ns ns ns ns ns ns ) Description Cycle Time Rise Time / Fall Time Pulse Width ( High, Low ) R/W and RS Set-Up Time R/W and RS Hold Time Data Set-Up Time Data Hold Time VIH1 VIL1 VIH1 VIL1 tsu1 R/W Test Pin E E E R/W, RS R/W, RS DB0 ~ DB7 DB0 ~ DB7 tH1 VIL1 VIL1 tH1 tw tF E VIH1 VIL1 VIH1 VIL1 tsu2 VIL1 tH2 tR DB0 ~DB7 VIH1 VIL1 Valid data tc VIH1 VIL1 KS0071B 32COM/60SEG DRIVER & CONTROLLER FOR DOT MATRIX LCD (2) Read mode ( VDD = 5V10%, VSS = 0V , Ta = -30 ~ +85 Symbol tC tR, tF tW tSU tH tD tDH Min 500 220 40 10 10 Typ - Description E Cycle Time Rise Time / Fall Time E Pulse Width R/W And RS Set-Up Time R/W And RS Hold Time Data output Delay Time Data Hold Time Symbol tC tR, tF tW tSU tH tD tDH Min 1400 500 70 10 20 ( VDD = 3V20%, VSS = 0V , Ta = -30 ~ +85 ) Typ Max Unit Test Pin ns E 20 ns E ns E ns R/W, RS ns R/W, RS 600 ns DB0 ~ DB7 ns DB0 ~ DB7 RS Max 20 120 - Unit ns ns ns ns ns ns ns ) Description E Cycle Time Rise Time / Fall Time E Pulse Width R/W And RS Set-Up Time R/W And RS Hold Time Data Output Delay Time Data Hold Time VIH1 VIL1 Test Pin E E E R/W, RS R/W, RS DB0 ~ DB7 DB0 ~ DB7 VIH1 VIL1 tsu1 tH R/W tw VIH1 tH tF VIH1 VIL1 VIL1 E DB0 ~DB7 tR tD VIH1 VIL1 VIL1 tDH Valid data tc VIH1 VIL1 KS0071B 32COM/60SEG DRIVER & CONTROLLER FOR DOT MATRIX LCD CONTROL and DISPLAY COMMAND Display clear Return home L L L L L L L L L L L L L L L L L H H X Execution time fOSC=250KHz 1.64mS 1.64mS Entry mode set L L L L L L L H I/D SH 40uS Command RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 Remark Cursor move to first digit I/D: Set cursor move direction I/D H Increase L Decrease SH: Specifies shift of display SH H Display is shifted L Display is not shifted Display D H Display on L Display off Cursor Display on/off L L L L L L H D C B 40uS C H Cursor on L Cursor off Blinking B H Blinking on L Blinking off S/C H Display shift L Cursor move Shift L L L L L H S/C R/L X X 40uS R/L H Right shift L Left shift Set function L L L Set CG RAM address L L L Set DD RAM address L L H L H H DL N X X X CG RAM address (corresponds to cursor address) DD RAM address DL H 8 bits interface L 4 bits interface N H 2 line display L 1line display 40uS 40uS CG RAM data is sent and received after this setting 40uS DD RAM data is sent and received after this setting BF Read busy flag & address L H Write data Read data H H L H BF Address counter used for both DD & CG RAM address Write data Read data 0uS 46uS 46uS H Busy L Ready - Reads BF indication internal operating performed - Reads address counter contents Write data into DD or CG RAM Read data into DD or CG RAM x : don’t care KS0071B 32COM/60SEG DRIVER & CONTROLLER FOR DOT MATRIX LCD DISPLAY MODE DESCRIPTION 1) 1 Line Max. 24 character display ( function set N=L ) • Normal DDRAM( HEX) line 1 2 00 01 3 4 02 5 03 6 04 7 8 9 10 11 12 13 14 15 16 17 18 19 display position (DEC) 20 21 22 23 24 DDRAM address (HEX) 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13 14 15 16 17 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13 14 15 16 17 18 DDRAM address (HEX) 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13 14 15 16 DDRAM address (HEX) • Shift left [00-4F] 1line 01 02 03 04 05 • Shift right [00-4F] 1line 4F 00 01 02 03 2) 2 Line Max. 24 character display ( function set N=H ) • Normal DDRAM( HEX) line 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 display position (DEC) 20 21 22 23 24 [00~27] 1line 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13 14 15 16 17 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51 52 53 54 55 56 57 DDRAM address (HEX) [40~67] 1line • Shift left [00~27] 1line 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13 14 15 16 17 18 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51 52 53 54 55 56 57 58 DDRAM address (HEX) [40~67] 1line • Shift right [00~27] 1line 27 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13 14 15 16 67 40 42 41 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51 52 53 54 55 56 [40~67] 1line DDRAM address (HEX) KS0071B 32COM/60SEG DRIVER & CONTROLLER FOR DOT MATRIX LCD 3) RELATION BETWEEN OSCILLATION FREQUENCY and LCD FRAME FREQUENCY a) 1/16 duty 120 clock COM1 1 2 3 ........ 14 15 16 1 2 3 ........ 14 15 16 1 30 31 32 1 VDD V1 V2 V3 ........ V4 ........ V5 1 frame 1 frame * One clock = 4 ( Fosc = 250 kHz ) * Latch clock = 120 clock = 4 120 = 480 , Frequency = 2.08 kHz * One frame = 4 120 16 = 7,680 = 7.68 ms * Frame frequency = 1/7.68ms = 130.2 Hz b) 1/32 duty 120 clock 1 COM1 2 3 ........ 30 31 32 1 2 3 ........ VDD V1 ........ V2 V3 ........ V4 V5 1 frame * One clock = 4 ( Fosc = 250 kHz ) * Latch clock = 120 clock = 4 120 = 480 , Frequency = 2.08 kHz * One frame = 4 120 32 = 15,360 = 15.36 ms * Frame frequency = 1/15.36 ms = 65.1 Hz 1 frame KS0071B 32COM/60SEG DRIVER & CONTROLLER FOR DOT MATRIX LCD APPLICATION INFORMATION 1) LCD panel: 24 character 1 line character format: 57 dots + cursor line ( 1/5 bias, 1/16 duty ) C16 C15 C14 C13 C12 C11 C10 C9 KS0071B C1 C2 C3 C4 C5 C6 C7 C8 S1 S2 S3 S4 S5. . . S60 KS0071B 32COM/60SEG DRIVER & CONTROLLER FOR DOT MATRIX LCD 2) LCD panel: 24 character 2 line character format: 57 dots + cursor line ( 1/6.7 bias, 1/32 duty ) C 16 C 15 C 14 C 13 C 12 C 11 C 10 C 9 C1 C2 C3 C4 C5 C6 C7 K S0071B C8 C 17 C 18 C 19 C 20 C 21 C 22 C 23 C 24 S1 S2 S3 S4 S5 . . S 60 C 32 C 31 C 30 C 29 C 28 C 27 C 26 C 25 KS0071B 32COM/60SEG DRIVER & CONTROLLER FOR DOT MATRIX LCD APPLICATION CIRCUIT 1) LCD driving voltage is generated by KS0071B ( voltage doubler ) ( 1/6.7 bias, 1/32 duty ) VD D VD D R C1 6 V1 R V2 C9 2.7R V3 Bright control C1 R V4 R V5 V5O UT 10uF K S0071B + VC I + C8 - LC D Panel (24 C H 2 line) VSS C1 + C1 7 4.7uF C2 O SC1 Rf = 91 2% O SC2 O pen T1, T 2 C2 4 S1 RS RW E M P U . . . DB 0 . . . S60 DB 7 C3 2 C2 5 KS0071B 32COM/60SEG DRIVER & CONTROLLER FOR DOT MATRIX LCD 2) LCD driving voltage is supplied from external power supply ( 1/6.7 bias, 1/32 duty ) VDD VDD R C16 V1 R V2 C9 2.7R V3 C1 R V4 R V5 Bright control KS0071B V5OUT VSS C8 LCD Panel (24 CH 2 line) VDD VCI Open C17 C1 Open C2 OSC1 Rf = 912% OSC2 Open T1, T2 C24 S1 RS RW E MPU . . . DB0 . . . S60 DB7 C32 C25 KS0071B 32COM/60SEG DRIVER & CONTROLLER FOR DOT MATRIX LCD Standard Character Pattern (KS0071B-00)