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application note vacuum fluorescent display module general description character display module futaba vacuum fluorescent display M402SD07GS, with futaba vfd 402-sd-07gk display, produces 40 digits on 2 rows. each character is displayed in 5 7 dot matrix with the cursor under it. consisting of a vfd, microcomputer, driver ic, the module can be connected directly to the system bus, thus simplifying interfacing. the bright and aesthetically pleasing vfd makes the module desirable for application in office equipment?s, computer terminals, measuring equipment, etc. an-e-2247a M402SD07GS free datasheet http:///
an-e-2247a [important safety notice] important safety notice please read this note carefully before using the product. warning ? the module should be disconnected from the power supply before handling. ? the power supply should be switched off before connecting or disconnecting the power or interface cables. ? the module contains electronic components that generate high voltages which may cause an electrical shock when touched. ? do not touch the electronic components of the module with any metal objects. ? the vfd used on the module is made of glass and should be handled with care. when handling the vfd, it is recommended that cotton gloves be used. ? the module is equipped with a circuit protection fuse. ? under no circumstances should the module be modified or repaired. any unauthorized modifications or repairs will invalidate the product warranty. ? the module should be abolished as the factory waste. ! free datasheet http:///
an-e-2247a [contents] contents page 1. features ??????????????????????????????????????????????????????????????????????????????????? 1 2. general specifications 2-1. dimensions, weight ???????????????????????????????????????????????????????? 2 2-2. specifications of the display panel ???????????????????? 2 2-3. environment conditions ??????????????????????????????????????????? 2 2-4. absolute maximum ratings ????????????????????????????????????? 3 2-5. recommended operating conditions ?????????????????? 3 2-6. electrical characteristics ???????????????????????????????????? 3 3. function 3-1. data and control code write-in ?????????????????????????? 4 3-2. control code ??????????????????????????????????????????????????????????????????? 5 7 3-3. self-test ?????????????????????????????????????????????????????????????????????????????? 8 3-4. power on reset ???????????????????????????????????????????????????????????????? 8 3-5. selection of input mode ????????????????????????????????????????????? 8 4. interface connection 4-1. connector pin connection ??????????????????????????????????????? 9 4-2. write-in timing ????????????????????????????????????????????????????????????????? 9 4-2-1. serial input ?????????????????????????????????????????????????????????????????? 9 4-2-2. parallel input ???????????????????????????????????????????????????????????? 10 figure-1 mechanical drawing ??????????????????????????????????????? 11 figure-2 circuit block diagram ??????????????????????????????????? 12 figure-3 display character code (europe font) ???????? 13 5. warranty ???????????????????????????????????????????????????????????????????????????????? 14 6. operating recommendations ??????????????????????????????????????? 14 free datasheet http:///
an-e-2247a [1/14] 1. features 1-1. using one chip computer, the module can be connected to the system bus directly. 1-2. two hundred fourteen different characters consisting of alpha-numeric and other symbols can be displayed. 1-3. by using dimming function, brightness can be controlled into four levels. 1-4. since a dc-dc converter is included, only a 5v power source is required to operate the module. 1-5. high quality reliability and long life can be achieved with futaba vfd. 1-6. either parallel or serial mode can be selected as the data input. serial baud-rate is set on 9600bps, and it can be selected 4800,2400,1200bps with jumper. 1-7. the module's compact, light and thin mechanical sizing allows for maximum mounting flexibility. free datasheet http:///
an-e-2247a [2/14] 2. general specifications 2-1. dimensions, weight (refer to figure-1) table-1 item specification unit outer dimension (w) 240 1 (h) 43 1 (t) 20.6 max. (except the connector) mm weight approx. 140 g 2-2. specifications of the display panel table-2 item specification unit display area 16.4(h) 186.8(w) mm number of digit 40digits(5 7dot+cursor) 2rows ? digit pitch (h w) 10.0(h) 4.7(w) mm digit size (h w) 5.0(h) 3.5(w) mm color of illumination green( p=505nm) ? note) by using a filter, uniform color ranging from blue to orange (including white) can be obtained. 2-3. environment conditions table-3 item symbol min. max. unit operating temperature t opr -20 +70 c storage temperature t stg -40 +85 c operating humidity (note) h opr 20 85 % storage humidity (note) h stg 20 90 % vibration (10 55hz) ? ? 4 g shock ? ? 40 g note) avoid operations and or storage in moist environmental conditions. 2-4. absolute maximum ratings table-4 item symbol min. max. unit supply voltage v cc ? 7.0 v input signal voltage v is -0.3 v cc+0.3 v free datasheet http:///
an-e-2247a [3/14] 2-5. recommended operating conditions table-5 item symbol condition min. typ. max. unit supply voltage v cc ? 4.5 5.0 5.5 v h-level input voltage v ih 2.0 ? ? v l-level input voltage v il v cc=5.0v ? ? 0.8 v 2-6. electrical characteristics table-6 item symbol condition min. typ. max. unit supply current i cc ? 750 1000 ma power consumption ? ? 3.75 5.0 w luminance l v cc=5.0v all on 340 (100) 690 (200) ? ( ? ) cd/m 2 (fl) h-level input current i ih v cc=5.0v ? ? 20 a l-level input current i il v cc=0v ? ? -0.36 ma h-level output voltage v oh v cc=5.0v i oh =-2.6ma 2.4 ? ? v l-level output voltage v ol v cc=5.0v i oh =12ma 0.25 ? 0.4 v note) the surge current can be approx.2 3 times the specified supply current at power on. free datasheet http:///
an-e-2247a [4/14] 3. function the module has data and control code write, self test and power on reset functions. 3-1. data and control code write-in table-7 test sel wr rxd function parallel and serial interface l x x x self test parallel interface h or nc l nc data and control code write in serial interface h or nc nc nc * data and control code write in l : low level (0v) h : high level (5v) nc: non connection : low to high transition * : rxd (serial input) x : low or high table-7 data and control code write-in when the data is being written in, the busy signal is active which indicates that the module is processing the data. (when the data is under processing, the busy signal is high "h".) the display character form follows equivalent to ascii (alphabet, numeric and symbols etc.). after display character is written in, the cursor will be shifted to the right one digit automatically. the above action can be executed, only the busy signal is low "l". free datasheet http:///
an-e-2247a [5/14] 3-2. control code the control are available as follows. the details will be explained on the next page. (1) dim : dimming (04 hex) (2) bs : back space (08 hex) (3) ht : horizontal tab (09 hex) (4) lf : line feed (0a hex) (5) cr : carriage return (0d hex) (6) dp : display position (10 hex) (7) dc1 : normal display mode (11 hex) (8) dc2 : vertical scroll mode (12 hex) (9) dc3 : cursor on mode (13 hex) (10) dc4 : cursor off mode (14 hex) (11) rst : reset (1f hex) (1) dim (dimming) : 04 hex brightness can be controlled into four levels by using this function. after writing 04h, next one hex byte as below mentioned is written to change the brightness out put. 1 byte 1 byte (dim command code), 04h + dimming level data table-8 dimming level data 100 % 60 % 40 % 20 % ffh 60h 40h 20h free datasheet http:///
an-e-2247a [6/14] (2) bs (back space) : 08 hex dc1 mode : the cursor position (write-in position) is shifted to the left one digit. (beyond this point, the position of cursor is identical with write-in position of the display, unless otherwise specified. under dc4 mode, the cursor will not show up.) when the cursor is on the most significant digit of the second row, the cursor moves to the least significant digit of the first row. when the cursor is on the most significant digit of the first row, the cursor moves to the least significant digit of the second row. dc2 mode : the same as above. (3) ht (horizontal tab) : 09 hex dc1 mode : the cursor position is shifted to the right one digit. when the cursor is on the least significant digit of the first row, the cursor moves to the most significant digit of the second row. when the cursor is on the least significant digit of the second row, the cursor moves to the most significant digit of the first row. dc2 mode : when the cursor is on the least significant digit of the second row, the characters displayed in the second row are shifted up to the first row and the cursor moves to the most significant digit of the second row. subsequently, the second row is cleared. (4) lf (line feed) : 0a hex dc1 mode : the cursor moves up or down to another row staying on the same line. dc2 mode : when the cursor is in the second row, the character displayed there, is shifted up to the first row, leaving the cursor at its present position, then the second row is cleared. when the cursor is in the first row, the same as dc1 mode operation. (5) cr (carriage return) : 0d hex dc1 mode : the cursor moves to the most significant digit of the same row. dc2 mode : the same as dc1 mode operation. (6) dp (display position) :10 hex instead of writing the character from the first digit, the write-in starting position can be pointed by using this function. after writing 10hex to prepare module for this command, another hex byte is written to specify the position desired. a third byte representing data is then sent. the most significant digit the least significant digit 1st row 00 hex 27 hex 2nd row 28 hex 4f hex free datasheet http:///
an-e-2247a [7/14] dc1-dc6 selects the display mode. (7) dc1 (normal display mode) :11 hex after writing a character, the cursor is shifted to the right one digit automatically. when the cursor is on the least significant digit of the first row, the cursor moves to the most significant digit of the second row. when the cursor is on the least significant digit of the second row, the cursor moves to the most significant digit of the first row. (8) dc2 (vertical scroll mode) : 12 hex after writing the characters up to the least significant digit of the second row, all the characters displayed in the second row are shifted to the upper row (first row), clearing the second row. when the power is turn on, this dc2 mode is selected, and will be held until another mode is selected. (9) dc3 (cursor on mode) : 13 hex the cursor is displayed. when the power is turn on, this dc3 mode is selected and will be held until another mode (dc4) is selected. (10) dc4 (cursor off mode) : 14 hex the cursor won't be displayed. (11) rst (reset) : 1f hex resetting the module. all the characters displayed are erased, then the write-in position (cursor position) is set on the most significant digit of the first row. the displaying status is the same as the power on reset. the display mode is set for dc2. the cursor mode is set for dc3. free datasheet http:///
an-e-2247a [8/14] 3-3. self-test test ="l" (connector pin #16 is connected to gnd.) starts the self-test. then the display shows all characters, alphabet, numeric and symbols, in that order. eighty (2 40) characters are displayed at a time. using this mode, neither data write-in nor control code write-in is allowed. to release this mode, test must be set to "h". 3-4. power on reset when the module is turned on , the display and the memory are cleared and the module is initialized. the display mode is set for dc2, and the cursor mode is set for dc3. 3-5. selection of input mode table-10 shows the combinations of the signal lines for the parallel or serial input. users must choose of the combinations. unused signal line are to be open (internally pulled up). ? serial input baud rate is selected by j1 j2. table-9 j1 short open short open j2 short short open open baud rate 1200bps 2400bps 4800bps 9600bps note) j1 and j2 opened when a module is shipped. table-9 baud rate selection j1 j2 baud rate select free datasheet http:///
an-e-2247a [9/14] 4. interface connection 4-1. connector pin connection connector : a1-20pa-2.54dsa (hirose) or equivalent socket : hif3ba-20d-2.54r (hirose) or equivalent table-10 pin no. signal serial in parallel in pin no. signal serial in parallel in 1 d7 nc 2 +5v 3 d6 nc 4 +5v 5 d5 nc 6 +5v 7 d4 nc 8 gnd 9 d3 nc 10 gnd 11 d2 nc 12 gnd 13 d1 nc 14 gnd 15 d0 nc 16 test 17 wr nc 18 sel nc 19 rxd nc 20 busy nc : no-connection : connection 4-2. write-in timing 4-2-1. serial input stop d7 d6 d5 d4 d3 d2 d1 d0 start rxd busy t (data) =10 6 /baud rate [ s] (this depends on the selection of the baud rate) t (data) /2 [ s] (busy becomes "h" at the center of stop bit.) t (wait) : 0 min. [ s] fig 1. timing for write-in free datasheet http:///
an-e-2247a [10/14] 4-2-2. parallel input data sel wr busy fig.2. write-in timing table-11 min. max. note t su(data) 50ns ? t h(data) 50ns ? t su( sel ) 50ns ? t h( sel ) 50ns ? t pw( wr ) 50ns ? t wait(1) 0ns ? t wait(2) 250ns ? for min. 250ns, wr should not be active (positive), after busy is "l". t delay ? 50ns free datasheet http:///
an-e-2247a [11/14] M402SD07GS mechanical drawing figure-1 free datasheet http:///
an-e-2247a [12/14] M402SD07GS circuit block diagram figure-2 reset v cc(+5v) gnd j1 j2 clock,baud rate select anode driver grid driver dc/dc converter osc osc d0 d7 g/a rxd wr sel test busy ac k ain res gck gin x1 rxd wr sel test busy d7 d0 anode driver (40bits) 2 anode 1-72 402-sd-07gk 5 7dots+cursor grid driver (40bits) grid 1-40 e f e f cpu free datasheet http:///
an-e-2247a [13/14] M402SD07GS display character code (europe font) figure-3 d7 d6 d5 d4 0 0 1 0 0 0 1 1 0 1 0 0 0 1 0 1 0 1 1 0 0 1 1 1 1 0 0 0 1 0 0 1 1 0 1 0 1 0 1 1 1 1 0 0 1 1 0 1 1 1 1 0 1 1 1 1 0 1 2 3 4 5 6 7 8 9 a b c d e f 23456789abcdef d3 d2 d1 d0 0 0 0 0 0 0 0 1 0 0 1 0 0 0 1 1 0 1 0 0 0 1 0 1 0 1 1 0 0 1 1 1 1 0 0 0 1 0 0 1 1 0 1 0 1 0 1 1 1 1 0 0 1 1 0 1 1 1 1 0 1 1 1 1 sp : space sp free datasheet http:///
an-e-2247a [14/14] 5. warranty this display module is guaranteed for 1 year after the shipment from futaba. 6. operating recommendations 6-1. avoid applying excessive shock or vibration beyond the specification for this module. 6-2. since vfds are made of glass material, careful handling is important. avoid applying any shock to the exhaust chip of the display, it may easily to break. 6-3. applying lower voltage than specified may cause non activation for the selected pixels. conversely, higher voltage may cause non-selected pixels to be activated. if users observe the above phenomenon, check the voltage level of the power supply. 6-4. avoid plugging or unplugging the interface connection with the power on. 6-5. if the start up time of the supply voltage is slow, the cpu may not be reset. the supply voltage must be risen up to a specified voltage level within 30msec. 6-6. avoid using the module where excessive noise interference is expected. noise affects the interface signal and causes improper operation. keep the length of the interface cable less than 50cm (when the longer cable is required, please contact futaba engineering.). 6-7. when power supply is turned off, the capacitor isn't discharged immediately. the high voltage applied to the vfd must not contact the controller ic. (the shorting of the mounted components within 30sec. after power off may cause damage.) 6-8. the module equips a fuse. when some abnormality happen such as open/short circuit, defective component, the fuse will be blown and it will be prevented from accident. remarks : the specification is subject to change without prior notice. your consultation with futaba sales office is recommended for the use of this module. free datasheet http:///

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