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? semiconductor MSC7128-XX 1/27 ? semiconductor MSC7128-XX 5 7-dot character 16-digit display controller/driver general description the MSC7128-XX is a general purpose display controller for vacuum fluorescent display tube. the MSC7128-XX drives displays with up to 35 anodes (dots) and up to 16 grids (characters) plus a cursor. the controller accepts command and display data input words on a clocked serial input line. commands control the on/off duty cycle, starting character position, number of characters to display and display modes (pla mode and lamp test mode). an internal pla-type character generator provides character decoding and dot pattern generation for the full 128 characters. a 35 128-bit pla (rom) code is programmable. features ? logic supply voltage (v dd ) :+5v ? vf driver supply voltage (v ee ) :C55v ? driver output current C vf grid driver :C30ma C vf anode driver :C2ma C vf cursor driver :C10ma ? direct drive capability for vacuum fluorescent display (no pull-down resistor is required) ? built-in oscillation circuit ? built-in power-on-reset circuit with external c ? serial host interface (data in, clock, chip select) ? serial data input for 8-bit control and display data words ? command functions C on/off duty cycle : 0/16 to 15/16 C character display position : 0 to 15 C number of display digits :1 to 16 C display modes : pla mode, and lamp test mode ? built-in 35 x 128-bit pla-type character generator C character font :5 7 C number of characters :128 C programmable pla code ? package options: 64-pin plastic sdip (sdip64-p-750-1.78) (product name : msm7128-xxss) 64-pin plastic qfp (qfp64-p-1420-1.00-bk) (product name : msm7128-xxgs-bk) xx indicates the code number. e2c0029-27-y4 this version: nov. 1997 previous version: jul. 1996
? semiconductor MSC7128-XX 2/27 block diagram seg driver latch pla latch ram 8-bit shift register v dd cs cp reset test step test count v ss osci osco cs cp reset osc seg1 seg2 seg34 seg35 seg36 com1 com2 com14 com15 com16 v ee 8 8 b0-7 3 5 b4-6 command decoder rl timing generator control reset reset cs cp d.g load 4 b0-3 4 b0-3 reset r dutycycle register dutycycle counter b0-3 4 d.g load reset reset duty and blank generator reset 4 digit count register b a a = b address comp w.a.c. count w.a.c. count w.a.c. load b0-3 4 write address counter read address counter 44 4416 w/r address selector 4 display data buffer 8bits 16 words 8 7 35 36 f w rampc lr rom pc1 rom pc2 f r reset f dig reset latch blank duty and blank decoder f seg reset lt lr s character generator 35 128 bits oe oe com driver da
? semiconductor MSC7128-XX 3/27 input and output configuration ? input pin v dd da cs cp osci gnd reset v dd v dd r test count test step ? output pin osco v dd v dd seg1 - 35 v ee v dd seg36 com1-16 v ee
? semiconductor MSC7128-XX 4/27 pin configuration (top view) 31 32 34 33 seg 28 seg 27 seg 25 seg 26 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 osci test count test step v ss v ee com 1 com 2 com 3 com 4 com 5 com 6 com 7 com 8 com 9 com10 cs da cp reset v dd 1 v dd 2 seg 1 seg 2 seg 3 seg 4 seg 5 seg 6 seg 7 seg 8 seg 9 seg 10 17 18 19 20 48 47 46 45 com11 com12 com13 com14 seg 11 seg 12 seg 13 seg 14 21 22 23 24 25 26 44 43 42 41 40 39 com15 com16 seg 36 seg 35 seg 34 seg 33 seg 15 seg 16 seg 17 seg 18 seg 19 seg 20 27 28 29 30 38 37 36 35 seg 32 seg 31 seg 30 seg 29 seg 21 seg 22 seg 23 seg 24 osc0 64-pin plastic shrink dip
? semiconductor MSC7128-XX 5/27 pin configuration (top view) 15 16 17 18 19 cs v ss v ee com 1 seg 26 4 3 2 1 5 6 7 8 9 10 11 12 13 14 20 seg 32 21 seg 31 22 seg 30 23 seg 29 24 seg 28 25 seg 27 26 27 28 29 30 31 32 48 49 50 51 47 46 45 44 43 42 41 40 39 38 64 63 62 61 60 59 58 57 56 55 54 53 52 da osc o osc i test step test count cp reset v dd1 v dd2 seg 25 seg 24 seg 23 seg 22 seg 21 seg 20 37 36 35 34 33 seg 3 seg 5 seg 6 seg 7 seg 8 seg 9 seg 10 seg 11 seg 12 seg 13 seg 14 seg 4 seg 15 seg 16 seg 17 seg 18 seg 19 seg 1 seg 2 com 16 seg 36 seg 35 seg 34 seg 33 com 2 com 3 com 4 com 5 com 6 com 7 com 8 com 9 com 10 com 11 com 12 com 13 com 14 com 15 64-pin plastic qfp
? semiconductor MSC7128-XX 6/27 pin description symbol type description v dd1 C v ss : internal logic supply voltage v dd2 C v ee : vf tube driving circuit supply voltage v dd1 v dd2 connected to v ss v ee power source da i serial data input from lsb (positive logic) microcomputer shift clock input. data is shifted at the leading edge of the cp . cp i microcomputer chip select input. when the pin is high, the serial data transfer is inhibited. cs i microcomputer osci i osco o rc oscillation, external rc pin. f osc = 250khz at c = 100pf and r = 47k w . reset input (pull-up resistor built in). when the pin is low, the internal logic is reset, and the outputs of seg1 to seg36 and com1 to com16 are low. reset i vf tube grid electrode driving outputs. this pin can be connected directly to the vf tube. no pull-down resistor is required. i oh > C30ma com1 com16 ~ o vf tube grid electrode vf tube 5 7 -dot anode electrode driving outputs. this pin can be connected directly to the vf tube. no pull-down resistor is required. i oh > C2ma seg1 seg35 ~ o vf tube anode electrode vf tube cursor anode electrode driving output. this pin can be connected directly to the vf tube. no pull-down resistor is required. i oh > C10ma seg36 o vf tube anode electrode test step i test mode setting input (normally open) test count i test clock input (normally open)
? semiconductor MSC7128-XX 7/27 absolute maximum ratings parameter symbol condition unit power supply voltage (1) v dd Cv ss v power supply voltage (2) v dd Cv ee v rating C0.3 to +6.5 0 to 65 input voltage v in Cv ss v ta 25c power dissipation p d w C0.3 to v dd + 0.3 up to 1.0 storage temperature t stg c C55 to +150 com1 to com16 i o1 ma C40 seg1 to seg35 i o2 ma C4 seg36 i o3 ma C15 output current recommended operating conditions parameter symbol condition max. unit power supply voltage (1) v dd Cv ss 5.5 v typ. power supply voltage (2) v dd Cv ee 60 v min. 4.5 10 high level input voltage v ih Cv ss v 0.7v dd low level input voltage v il Cv ss 0.3v dd v cp frequency f cp 500 khz 100pf, 47k w osc frequency f osc 270 khz 220 170 operating temperature t op +75 c C20
? semiconductor MSC7128-XX 8/27 electrical characteristics dc characteristics parameter symbol condition max. unit high level input voltage v ih v min. 0.7v dd low level input voltage v il 0.3v dd v (v dd Cv ss = 5v10%, v dd Cv ee = 60v, ta = C20 to +75c) da, cp , cs reset v dd = 5.5v v in = 5v i ih1 5 m a C5 test step test count v dd = 5.5v v in = 5v i ih2 1ma 0.25 high level input current da, cp , cs test step test count v dd = 5.5v v ih = 0.5v i il1 5 m a C5 reset v dd = 5.5v v ih = 0.5v i il2 C100 m a C25 v oh1 v v dd C0.6 v oh2 v v dd C4 osco i oh = C500 m a com1~16 i oh = C30ma v oh3 v v dd C3 v oh4 v v dd C4 seg1~35 i oh = C2ma seg36 i oh = C10ma low level input current high level output voltage v ol1 v ss +0.6 v v ol2 v ee +3 v osco i ol = 500 m a com1~16 i ol = 100 m a v ol3 v ee +3 v v ol4 v ee +3 v seg1~35 i ol = 100 m a seg36 i ol = 100 m a low level output voltage all segs on, 16-digit display, duty cycle 15/16, no load i ss1 15 ma all segs low, all coms high i ss2 1.5 ma all segs on, 16-digit display, duty cycle 15/16, no load i ee1 1.0 ma all segs low, all coms high i ee2 15 ma current consumption
? semiconductor MSC7128-XX 9/27 ac characteristics timing diagram data timing valid t ds t cp t wcp t csh t dh t css 0.7 0.3 0.3 0.3 0.3 0.3 0.7 0.3 valid valid *t = 1/f osc parameter symbol condition max. unit cp cycle time t cp m s min. 2 (v dd Cv ss = 5v10%, ta = C20 to +75c) cp pulse width t wcp m s 1 data set-up time t ds m s 0.5 data hold time t dh m s 0.5 cs set-up time t css m s 1 cs hold time t csh s 32t* r = 47k w , c = 100pf osc frequency f osc 270 khz 170
? semiconductor MSC7128-XX 10/27 data lsb/msb timing cp t doff msb lsb end of data word next data word data input off time t doff = 32tmin (t=1/f osc ) digit timing (16-digit display) seg n t 1 =64 16=1024t com 16 v dd v ee com 15 com 14 com 13 com 12 com 11 com 10 com 9 com 8 com 7 com 6 com 5 com 4 com 3 com 2 com 1 v dd v ee t 2 t 3 60t 4t n = 1 to 36 t 1 = frame count t 2 = display timing t 3 = blank timing t = 1/f osc f osc = 245khz t 1 = 4.096ms t 2 = 240 m s t 3 = 16 m s when
? semiconductor MSC7128-XX 11/27 reset timing option 1 when a capacitor is connected between the reset pin and v ss , reset on time t reset on : 250ms typ. reset off time t reset off : 50 m s min. (external capacitor : 1 m f) option 2 when a reset signal is externally input, reset on time t reset on : 50 m s min. reset off time t reset off : 50 m s min. v dd reset data valid t reset on da t reset off
? semiconductor MSC7128-XX 12/27 functional description data transfer method and command write method a display control command or data is written by the 8-bit serial transfer method. the figure below shows the write timing. when the cs pin is low, data can be transferred. data of 8 bits in length is input to the da pin sequentially starting with the lsb. (lsb first) data is shifted at the rising edge of a shift clock pulse which is input to the cp pin as shown in the figure below. when 8-bit data is entered, an inner load signal is automatically generated, and data is written into the registers and ram. therefore, there is no need to input an external load signal. if the cs pin is changed from low to high, the serial transfer is inhibited, and data, which is entered after the cs pin is changed from high to low, is recognized in units of 8 bits. the first 8 bits become the first byte, and the second 8 bits become the second byte and the next 8 bits become either the first byte or the second byte depending on the selected command. cs cp da t doff *1 t csh *2 b0 b1 b2 b3 b4 b5 b6 b7 b0 b1 b2 b3 b4 b5 b6 b7 lsb lsb msb msb first byte second byte *1 t doff : refer to data lsb/msb timing. *2 t csh : refer to ac characteristics and data timing. address set lamp test character code set display duty set number of display digits set no. command 0 1 2 3 4 b7 1 1 1 1 1 b6 0 1 0 0 0 b5 0 0 0 1 1 b4 0 0 1 0 1 b3 x x x x x b2 x x x x x b1 x x x x x b0 x x x x x b7 x x cu x x b6 x x ch 6 x x b5 x x ch 5 x x b4 x x ch 4 x x b3 x 3 x ch 3 dc 3 dg 3 b2 x 2 x ch 2 dc 2 dg 2 b1 x 1 x ch 1 dc 1 dg 1 b0 x 0 lt ch 0 dc 0 dg 0 first byte second byte command type *1 when character codes are to be continuously transferred, addresses are automatically incremented (internally). accordingly, neither the address set command nor the first byte of the character code set command are required to set the second and the following character codes. *2 x : dont care
? semiconductor MSC7128-XX 13/27 command description ? address set command when the code of a display character is to be set, this command is used to specify the display location (digit number) of the character. the relation between the digit number x and common outputs com1 to com16 is as follows: ? character code set command this command is used to specify the character to be displayed in the digit place specified by the address set command. bits 0 to 6 of the second byte are used to specify the character code, and bit 7 is used to specify "yes" or "no" of cursor display. command format 1st byte 1 00 xxxx ch 3 ch 2 ch 1 ch 0 cu ch 6 ch 5 ch 4 7-bit character code select one of 128 codes 0: without cursor (seg36 off) 1: with cursor out (seg36 on) lsb 2nd byte 1 x com input 0 com1 1 com2 15 com16 1 000xxxx x 3 x 2 x 1 x 0 xxxx digit number (0 to 15) lsb lsb 1st byte 2nd byte command format
? semiconductor MSC7128-XX 14/27 an automatic address increment function is built in. to write multidigit display character codes, issue the address set command. to transfer the second and later digit display character codes, the first byte (operation code) of the character code command is not required. input the second byte. when this command is executed, 8-bit data for the second byte and later bytes, which is provided before the cs pin is turned high, is all treated as display character data. transfer examples of the address set command and the character set command 1st 2nd 1st 2nd 2nd 2nd 2nd cs data address set command character set command example 1: the display for com3 and the following is changed. 1000xxxx xxxx0 0 1 specify the digit number x=2 (com3) 1001xxxx cu ch 6 ch 5 ch 4 ch 3 ch 2 ch 1 ch 0 cu ch 6 ch 5 ch 4 ch 3 ch 2 ch 1 ch 0 cu ch 6 ch 5 ch 4 ch 3 ch 2 ch 1 ch 0 write the first character code write the character code to be displayed on com4 write the character code to be displayed on com5 x=15 (com16) is followed by x= 0 (com1) lsb lsb 0 lsb lsb
? semiconductor MSC7128-XX 15/27 number of display digits set command this command is used to set the digit count register and the number of display digits. the number of digits to be set ranges from 1 to 16. command format 1 011xxxx dg 3 dg 2 dg 1 dg 0 xxxx number of digits dg (0 to 15) lsb lsb 1st byte 2nd byte the relation between the value of dg to be set and com under display control is as follows: dg com displayed dg com displayed 0 com1 - com16 1 com1 8 com1 - com8 9 com1 - com9 2 com1 - com2 3 com1 - com3 10 com1 - com10 11 com1 - com11 4 com1 - com4 5 com1 - com5 12 com1 - com12 13 com1 - com13 6 com1 - com6 7 com1 - com7 14 com1 - com14 15 com1 - com15
? semiconductor MSC7128-XX 16/27 display duty set command assuming the original oscillation cycle as t, the time allocated to 1-digit display is 64t. the actual display time may be specified as 0 to 60t in increments of 4t. assuming the number of display digits as n and the parameter provided by the display duty set command as dc, the resultant display duty cycle ratio is as follows: 4 (dc) 64n = (dc) 16n command format 1 010xxxx dg 3 dg 2 dg 1 dg 0 xxxx dc value (0 to 15) lsb lsb 1st byte 2nd byte lamp test command this command is used to set the all-segment display mode. if this occurs, the 36 segments for each digit to be displayed are put into the on state. the number of display digits and the display duty cycle depend on the contents of the digit count register and of the duty register. the contents of the internal ram are not affected by this command. when the command is released, the original display appears once again. command for mat 1100xxxx xxxlt xxxx lsb lsb 0: normal mode 1: lamp test mode 1st byte 2nd byte
? semiconductor MSC7128-XX 17/27 power on reset operation operations when the reset pin is low are as follows: a. all segment driver outputs are low. b. all grid driver outputs are low. c. the number of display digits is set to 16. d. the display duty cycle is set to 0. test step and test count these pins are used for inspection before shipment, and should not be used by the user. when this ic is mounted, leave them open or connect to v ss . if they are connected to other pins, a malfunction may be caused.
? semiconductor MSC7128-XX 18/27 relation between segment output and vf tube dots 1-1 seg1 2-1 seg2 3-1 seg3 4-1 seg4 5-1 seg5 1-2 seg6 2-2 seg7 3-2 seg8 4-2 seg9 5-2 seg10 1-3 seg11 2-3 seg12 3-3 seg13 4-3 seg14 5-3 seg15 1-4 seg16 2-4 seg17 3-4 seg18 4-4 seg19 5-4 seg20 1-5 seg21 2-5 seg22 3-5 seg23 4-5 seg24 5-5 seg25 1-6 seg26 2-6 seg27 3-6 seg28 4-6 seg29 5-6 seg30 1-7 seg31 2-7 seg32 3-7 seg33 4-7 seg34 5-7 seg35 cursor seg36
? semiconductor MSC7128-XX 19/27 data setup flow character set address set display digit set display duty set power on character set cs da address set 1st 2nd 1st 2nd 2nd 2nd 2nd 1st 2nd 1st 2nd cp number of display digits set display duty set 1st : the first byte 2nd : the second byte note: to avoid display malfunction due to external noise, re-set occasionally the number of display digits set and display duty set.
? semiconductor MSC7128-XX 20/27 msc7128-01 rom code address 0(00h) address 1(01h) address 2(02h) address 3(03h) address 4(04h) address 5(05h) address 6(06h) address 7(07h) address 8(08h) address 9(09h) address 10(0ah) address 11(0bh) address 12(0ch) address 13(0dh) address 14(0eh) address 15(0fh) address 16(10h) address 17(11h) address 18(12h) address 19(13h) address 20(14h) address 21(15h) address 22(16h) address 23(17h) address 24(18h) address 25(19h) address 26(1ah) address 27(1bh) address 28(1ch) address 29(1dh)
? semiconductor MSC7128-XX 21/27 address 30(1eh) address 31(efh) address 32(20h) address 33(21h) address 34(22h) address 35(23h) address 36(24h) address 37(25h) address 38(26h) address 39(27h) address 40(28h) address 41(29h) address 42(2ah) address 43(2bh) address 44(2ch) address 45(2dh) address 46(2eh) address 47(2fh) address 48(30h) address 49(31h) address 50(32h) address 51(33h) address 52(34h) address 53(35h) address 54(36h)
? semiconductor MSC7128-XX 22/27 address 55(37h) address 56(38h) address 57(39h) address 58(3ah) address 59(3bh) address 60(3ch) address 61(3dh) address 62(3eh) address 63(3fh) address 64(40h) address 65(41h) address 66(42h) address 67(43h) address 68(44h) address 69(45h) address 70(46h) address 71(47h) address 72(48h) address 73(49h) address 74(4ah) address 75(4bh) address 76(4ch) address 77(4dh) address 78(4eh) address 79(4fh)
? semiconductor MSC7128-XX 23/27 address 80(50h) address 81(51h) address 82(52h) address 83(53h) address 84(54h) address 85(55h) address 86(56h) address 87(57h) address 88(58h) address 89(59h) address 90(5ah) address 91(5bh) address 92(5ch) address 93(5dh) address 94(5eh) address 95(5fh) address 96(60h) address 97(61h) address 98(62h) address 99(63h) address 100(64h) address 101(65h) address 102(66h) address 103(67h) address 104(68h)
? semiconductor MSC7128-XX 24/27 address 105(69h) address 106(6ah) address 107(6bh) address 108(6ch) address 109(6dh) address 110(6eh) address 111(6fh) address 112(70h) address 113(71h) address 114(72h) address 115(73h) address 116(74h) address 117(75h) address 118(76h) address 119(77h) address 120(78h) address 121(79h) address 122(7ah) address 123(7bh) address 124(7ch) address 125(7dh) address 126(7eh) address 127(7fh)
? semiconductor MSC7128-XX 25/27 application circuit vf display grid (digit) heater transformer seg1 - 36 com1 - 16 v dd da cp cs MSC7128-XX v ss test step test count reset osci osco v ee v dd mcu gnd +5v + +60v c r r1 zd C + C + C anode (segment) output port
? semiconductor MSC7128-XX 26/27 (unit : mm) package dimensions notes for mounting the surface mount type package the sop, qfp, tsop, soj, qfj (plcc), shp and bga are surface mount type packages, which are very susceptible to heat in reflow mounting and humidity absorbed in storage. therefore, before you perform reflow mounting, contact okis responsible sales person for the product name, package name, pin number, package code and desired mounting conditions (reflow method, temperature and times). sdip64-p-750-1.78 package material lead frame material pin treatment solder plate thickness package weight (g) epoxy resin cu alloy solder plating 5 m m or more 8.70 typ.
? semiconductor MSC7128-XX 27/27 (unit : mm) notes for mounting the surface mount type package the sop, qfp, tsop, soj, qfj (plcc), shp and bga are surface mount type packages, which are very susceptible to heat in reflow mounting and humidity absorbed in storage. therefore, before you perform reflow mounting, contact okis responsible sales person for the product name, package name, pin number, package code and desired mounting conditions (reflow method, temperature and times). qfp64-p-1420-1.00-bk package material lead frame material pin treatment solder plate thickness package weight (g) epoxy resin 42 alloy solder plating 5 m m or more 1.25 typ. mirror finish

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