ST Sitronix ST7921 96CH Segment Driver For Dot Matrix LCD Features : Display driving bias : static to 1/5 Power supply for logic : 2.7V ~ 5.5V Power supply for LCD voltage (V0~VSS) : 3V ~ 7V Dot matrix LCD driver with two 48 channel outputs Bias voltage (V0 ~ V4) Input/Output signals Input : Serial display data and control pulse from controller IC Output : 48 X 2 channels waveform for LCD driving General Description : ST7921 is a segment driver for dot matrix type LCD display. It features 96 channels with 48 X 2 bits bi-directional shift registers, data latches, LCD drivers and logic control circuits. It is fabricated by high voltage CMOS process with low current consumption. The ST7921 can convert serial data received from an LCD controller, such as ST7920, into parallel data and send out LCD driving waveforms to the LCD panel. The ST7921 is designed for general purpose LCD drivers. It can drive both static and dynamic drive LCD. The LSI can be used as segment driver. Ver 1.6 1/11 2005/05/24 ST7921 ST7921 Functional Block V1 V2 V3 V4 M CL1 CL2 S1...............................S48 S49...............................S96 SEGMENT DRIVER SEGMENT DRIVER VDD VSS V0 DATA LATCH(48bits) DATA LATCH(48bits) BIDIRECTIONAL SHIFTER(48bits) BIDIRECTIONAL SHIFTER(48bits) CONTOL DL1 SHL1 DR1 Ver 1.6 DL2 SHL2 DR2 2/11 2005/05/24 ST7921 Pin Description : Pin Name Purpose Description I/O VDD POWER for logic N/A VSS GROUND for logic N/A LCD Power for LCD driving voltage S1-S48 segment LCD driver output for part 1 O SHL1 direction direction control for part 1 segments I DL1, DR1 data in /out If SHL1 = 1 then DL1=out, DR1=in If SHL1 = 0 then DL1=in, DR1=out I/O S49-S96 segment LCD driver output for part 2 O SHL2 direction direction control for part 2 segments I DL2, DR2 data in/out If SHL2 = 1 then DL2=out, DR2=in If SHL2 = 0 then DL2=in, DR2=out I/O M alternation Alternate the LCD driving waveform I CL1 latch clock latch the data after shift is completed I CL2 shift clock shift the data into the segments I V0 V2 V3 Ver 1.6 3/11 I 2005/05/24 2005/05/24 9 4 9 3 9 2 9 1 9 0 8 9 8 8 8 7 8 6 8 5 8 4 8 3 8 2 8 1 8 0 . . . . . . . 6 6 6 5 6 4 6 3 6 2 6 1 6 0 5 9 5 8 5 7 5 6 95 5 5 9 6 5 4 9 7 5 3 9 8 5 2 9 9 5 1 10 0 5 0 4 7 10 4 4 6 4 5 2 Size: 4720x2560 um 10 6 4 4 Coordinate: center 10 7 4 3 Min. PAD Pitch: 10 8 4 2 120um 10 9 Circle here to find the first PAD 11 0 4 1 “GSM792E” Marking: Easy to find the PAD 4 0 G792E 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 . . . . . . . 2 9 3 0 3 1 3 2 3 3 3 4 3 5 3 6 3 9 3 7 3 8 4/11 10 3 10 5 Pad Arrangement 4 8 Ver 1.6 10 2 ST7921 4 9 (0,0 ) * chip substrate must connect to VSS 10 1 ST7921 Bonding Description Pad No. Pad Name X Y Pad No. Pad Name X Y 1 S[50] -2240 -1160 29 S[78] 1140 -1160 2 S[51] -2110 -1160 30 S[79] 1260 -1160 3 S[52] -1980 -1160 31 S[80] 1380 -1160 4 S[53] -1860 -1160 32 S[81] 1500 -1160 5 S[54] -1740 -1160 33 S[82] 1620 -1160 6 S[55] -1620 -1160 34 S[83] 1740 -1160 7 S[56] -1500 -1160 35 S[84] 1860 -1160 8 S[57] -1380 -1160 36 S[85] 1980 -1160 9 S[58] -1260 -1160 37 S[86] 2110 -1160 10 S[59] -1140 -1160 38 S[87] 2240 -1160 11 S[60] -1020 -1160 39 S[88] 2240 -1030 12 S[61] -900 -1160 40 S[89] 2240 -900 13 S[62] -780 -1160 41 S[90] 2240 -780 14 S[63] -660 -1160 42 S[91] 2240 -660 15 S[64] -540 -1160 43 S[92] 2240 -540 16 S[65] -420 -1160 44 S[93] 2240 -420 17 S[66] -300 -1160 45 S[94] 2240 -300 18 S[67] -180 -1160 46 S[95] 2240 -180 19 S[68] -60 -1160 47 S[96] 2240 -60 20 S[69] 60 -1160 48 S[48] 2240 60 21 S[70] 180 -1160 49 S[47] 2240 180 22 S[71] 300 -1160 50 S[46] 2240 300 23 S[72] 420 -1160 51 S[45] 2240 420 24 S[73] 540 -1160 52 S[44] 2240 540 25 S[74] 660 -1160 53 S[43] 2240 660 26 S[75] 780 -1160 54 S[42] 2240 780 27 S[76] 900 -1160 55 S[41] 2240 900 28 S[77] 1020 -1160 56 S[40] 2240 1030 Ver 1.6 5/11 2005/05/24 ST7921 Pad No. Pad Name X Y Pad No. Pad Name X Y 57 S[39] 2240 1160 85 S[11] -1140 1160 58 S[38] 2110 1160 86 S[10] -1260 1160 59 S[37] 1980 1160 87 S[9] -1380 1160 60 S[36] 1860 1160 88 S[8] -1500 1160 61 S[35] 1740 1160 89 S[7] -1620 1160 62 S[34] 1620 1160 90 S[6] -1740 1160 63 S[33] 1500 1160 91 S[5] -1860 1160 64 S[32] 1380 1160 92 S[4] -1980 1160 65 S[31] 1260 1160 93 S[3] -2110 1160 66 S[30] 1140 1160 94 S[2] -2240 1160 67 S[29] 1020 1160 95 S[1] -2240 1030 68 S[28] 900 1160 96 V0 -2240 890 69 S[27] 780 1160 97 V2 -2240 750 70 S[26] 660 1160 98 V3 -2240 610 71 S[25] 540 1160 99 VSS -2240 475 72 S[24] 420 1160 100 VDD -2240 340 73 S[23] 300 1160 101 CL1 -2240 210 74 S[22] 180 1160 102 SHL1 -2240 80 75 S[21] 60 1160 103 SHL2 -2240 -50 76 S[20] -60 1160 104 CL2 -2240 -180 77 S[19] -180 1160 105 DL1 -2240 -310 78 S[18] -300 1160 106 DR1 -2240 -440 79 S[17] -420 1160 107 DL2 -2240 -580 80 S[16] -540 1160 108 DR2 -2240 -720 81 S[15] -660 1160 109 M -2240 -860 82 S[14] -780 1160 110 S[49] -2240 -1010 83 S[13] -900 1160 84 S[12] -1020 1160 Ver 1.6 6/11 2005/05/24 ST7921 Functional Description : Clock The CL1 is the clock to latch data on the falling edge. It latches the data input from the bi-directional shift register at the falling edge of CL1 and transfers its outputs to the LCD driver circuit. The CL2 is the clock to shift data on the falling edge. It shifts the serial data at the falling of CL2 and transfers the output of each bit of the register to the latch circuit. Shift Registers And Data I/O The ST7921 supplies two sets of 48-bit shift register, which controls the shift direction by SHL1 & SHL2. The SHL1 controls the 1st 48-bit shift register, and SHL2 controls the 2nd 48-bit shift register. When SHL1 is connected to VDD, the 1st shift direction is from S48 to S1; when SHL1 is connected to VSS, the shift direction changes from S1 to S48. When SHL2 is connected to VDD, the 2nd shift direction is from S96 to S49; when SHL2 is connected to VSS, the shift direction changes from S49 to S96. The DL1, DR1, DL2, DR2 are data input or output option function. Shift Direction of Channel 1 SHL1 Shift Direction DL1 DR1 0 S1 S48 IN OUT 1 S48 S1 OUT IN Shift Direction of Channel 2 SHL2 Shift Direction DL2 DR2 0 S49 S96 IN OUT 1 S96 S49 OUT IN Ver 1.6 7/11 2005/05/24 ST7921 LCD Output Waveforms : Output of LATCH (DATA) M V0 V0 V2 Output (S1 ~ S80) V2 V3 VSS V3 VSS Timing Characteristics : VIH TWCKL CL2 VIL TR TWCKH TF TDH TSU Data in (DL1, DL2) (DR1, DR2) TD VOH Data out (DL1, DL2) (DR1, DR2) TSL VOL TLS TLS CL1 TWCKH TR TSU M Ver 1.6 8/11 2005/05/24 ST7921 D.C Characteristics: Symbol Parameter Test Condition Min. Typ. Max. Unit Applicable pin VDD Operating Voltage - 2.7 - 5.5 V - VLCD Driver Supply Voltage V0-VSS 3 - 7 V - VIH Input High Voltage - 0.7VDD - VDD V VIL Input Low Voltage - 0 - 0.3VDD V ILKG Input Leakage Current VIN = 0 ~ VDD -5 - 5 uA VOH Output High Voltage IOH = -0.4mA VDD-0.4 - - V VOL Output Low Voltage IOL = +0.4mA - - 0.4 V DL1,DL2,DR1,DR2 V1~V4, S1~S80 IDD Operating Current FCL2 = 400KHZ - 280 460 uA VDD,V0 IV Leakage Current VIN = VDD ~ VSS -10 - 10 uA V1 ~ V4 CL1,CL2,M,SHL1,SHL2 DL1,DL2,DR1,DR2 A.C Characteristics : Symbol Parameter FCL Data Shift Frequency - - 400 KHZ CL2 TWCKH Clock High Level Width - 800 - ns CL1,CL2 TWCKL Clock Low Level Width - 800 - ns CL2 TSL Clock Set-up Time CL2 CL1 500 - ns CL1,CL2 TLS Clock Set-up Time CL1 CL2 500 - ns CL1,CL2 TR/TF Clock Rise/Fall Time - - 200 ns CL1,CL2 TSU Data Set-up Time - 300 - ns DL1,DL2,DR1,DR2 TDH Data Hold Time - 300 - ns DL1,DL2,DR1,DR2 TD Data Delay Time CL = 15 PF - 500 ns DL1,DL2,DR1,DR2 Test Condition Min. Max. Unit Applicable pin Maximum Absolute Ratings : Symbol Parameters Min. Max. Unit VDD Supply Voltage -0.3 7 V TOPR Operating Temperature -20 85 0 C TSTG Storage Temperature -55 125 0 C Ver 1.6 9/11 2005/05/24 2005/05/24 Seg 1-64 Dout SHL1 SHL2 VSS V0 ST7920 DB0-DB7 ST7921 V2 DR2 DL2 DR1 CL1 CL2 M Seg 1-96 DL1 VDD SHL1 SHL2 VSS V0 V3 ST7921 V2 DR2 DL2 DR1 CL1 CL2 M V3 VDD VSS CL2 CL1 M V0 V1 V2 V3 V4 Vcc(+5V/+3V) To MPU Seg 1-96 DL1 VDD 10/11 Com 1-32 VR Regsister Regsister Regsister Regsister Regsister VSS Note:Regsister=2.2K~10K ohm VR=1K~30Kohm Ver 1.6 Application Circuit : (2Line x 16 Chinese Word) ST7921 Dot Matrix LCD Panel ST7921 ST7921 Specification Revision History Version Date C1.6 2005/05/24 Ver 1.6 Description 1. Modify Operating Temperature=-200C ~850C 11/11 2005/05/24