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rev: page: revision description appr: date: a - released. grw 6/20/90 b 4 changed height dimension from 11.6mm max. to 12.0mm max. grw 8/28/90 c all 3 4 6 converted to new format and edited. added sec. 2.0, applicable documents. changed 12.0mm max. height dimension to 13.0mm max. due to a new spacer. changed 1.5+/-.5mm spacer dimension to 2.5mm. changed 132.00 pattern length designation to correct value of 132.40. changed operating temperature range. drawing title: futaba corporation product specification of america part number: schaumburg, il. US16MY02AA designed by: engineering approval: customer name / part number: john peroutka standard product checked by: mfg & materials approval: date drawn: file name: 01/17/94 16my02a.doc customer approval: qa approval: date printed: sheet: n/a 01/05/98 1 of 14
part number: rev: futaba corporation US16MY02AA c of america date printed: sheet: schaumburg, il. 01/05/98 2 of 14 table of contents 1.0 introduction ................................ ................................ .............................. 3 2.0 applicable documents ................................ ................................ ........... 3 3.0 specifications ................................ ................................ ............................ 3 3.1 general ................................ ................................ ................................ ............... 3 3.2 mechanical ................................ ................................ ................................ ......... 4 3.3 block diagram ................................ ................................ ................................ ... 5 3.4 environmental ................................ ................................ ................................ .... 6 3.5 absolute maximum electrical ratings ................................ ................................ . 6 3.6 dc electrical characteristics ................................ ................................ .............. 7 3.7 ac electrical characteristics ................................ ................................ .............. 7 4.0 functional description ................................ ................................ ........ 9 4.1 writing control data bytes ................................ ................................ ................ 9 4.1.1 buffer pointer ................................ ................................ ................................ 10 4.1.2 digit counter ................................ ................................ ................................ . 11 4.1.3 duty cycle counter control ................................ ................................ .......... 11 4.2 writing character data bytes ................................ ................................ ........... 12 4.3 power-on reset ................................ ................................ ............................... 12 5.0 interface connections ................................ ................................ ....... 14 figures figure 1. mechanical drawing ................................ ................................ .................... 4 figure 2. block diagram ................................ ................................ ............................ 5 figure 3. sclk and data timing ................................ ................................ ............ 8 figure 4. byte to byte timing ................................ ................................ .................... 8 figure 5. power-up and reset\ timing ................................ ................................ ........ 8 figure 6. character codes ................................ ................................ ........................ 1 3
part number: rev: futaba corporation US16MY02AA c of america date printed: sheet: schaumburg, il. 01/05/98 3 of 14 1.0 introduction the US16MY02AA vfd module is an integrated display module utilizing the 16-my- 02gk single row 16 digit alphanumeric vfd. an on board converter supplies the dc and ac voltages necessary to drive the vfd. display driver circuitry provides character generation for 64 characters as well as 32 dimming levels. control of the module is via a simple synchronous serial interface. 2.0 applicable documents futaba america engineering standard faes 801, printed circuit board markings. futaba vacuum fluorescent display specification 16-my-02gk. 3.0 specifications 3.1 general item description number of characters 16 character format 14 segment alphanumeric character height 11.1 character width 6.4 character tilt 5 degrees peak wavelength of illumination 505 nm x = 0.235, y = 0.405 luminance 200 fl typ
part number: rev: futaba corporation US16MY02AA c of america date printed: sheet: schaumburg, il. 01/05/98 4 of 14 3.2 mechanical figure 1. mechanical drawing
part number: rev: futaba corporation US16MY02AA c of america date printed: sheet: schaumburg, il. 01/05/98 5 of 14 3.3 block diagram figure 2. block diagram
part number: rev: futaba corporation US16MY02AA c of america date printed: sheet: schaumburg, il. 01/05/98 6 of 14 3.4 environmental item symbol min max unit operating temperature t opr -20 +70 c storage temperature t stg -30 +85 c relative humidity (operating) h opr 20 85 % relative humidity (storage) h stg 20 90 % vibration (10-55 hz) - - 4.0 g shock - - 40 g 3.5 absolute maximum electrical ratings item symbol min max unit supply voltage v cc -0.3 6.5 v input signal voltage v in -0.3 vcc+0.3 v
part number: rev: futaba corporation US16MY02AA c of america date printed: sheet: schaumburg, il. 01/05/98 7 of 14 3.6 dc electrical characteristics item symbol min typ max unit supply voltage v cc 4.5 5.0 5.5 v supply current i cc - 350 500 ma high level input voltage v ih 3.6 - v cc + 0.3 v high level input current (v ih =5v) i ih - - 10 m a low level input voltage v il 0 - 1.0 v low level input current (v il =0v) i il - - -0.7 ma 3.7 ac electrical characteristics (see figures 3,4,5) (v cc = 5v) item symbol min max unit sclk high pulse width t on 1 20 m s sclk low pulse width t off 1 - m s set-up time data before sclk t su 200 - ns hold time data after sclk t hd 100 - ns wait time between bytes t wait 40 - m s lsb to lsb time t bb 120 - m s reset\ pulse width t rst 100 - m s reset to data time t rd 100 - m s
part number: rev: futaba corporation US16MY02AA c of america date printed: sheet: schaumburg, il. 01/05/98 8 of 14 timing diagrams sclk data figure 3. sclk and data timing diagram end of next data byte data byte sclk figure 4. byte to byte timing diagram vcc reset data data valid figure 5. power-up and reset\ timing diagram
part number: rev: futaba corporation US16MY02AA c of america date printed: sheet: schaumburg, il. 01/05/98 9 of 14 4.0 functional description input data from the host system is loaded into the module's display buffer via the serial data input channel. the internal timing and control system synchronizes the signal and digit output signals to provide correct timing for the multiplexing operation. a 16 x 64 bit programmable logic array (pla) is provided for segment decoding of the full upper -case ascii character set. input data from the host system is loaded as a series of 8 -bit data bytes clocked in on the high to low transition of the clock. control and character data bytes the most significant bit (bit 7) is loaded first and is referred to as the control bit (c -bit). if the c -bit of any byte is logical 1, the byte is a control data byte; if it is logical 0, the byte is a character data byte. the functions and formats of control and character data bytes are described in detail below. 4.1 writing control data bytes when the c -bit of the loaded byte is logical 1, bits 6 and 5 are decoded into one of three control commands, while data associated with the command function is decoded from bits 4 to 0. the three display functions controlled by bits 7 to 4 are tabulated below (note: the duty cycle control byte uses bits 7 to 5). 8-bit control byte 7 6 5 4 3 2 1 0 function 1 0 1 0 x x x x load buffer pointer (position of character to be defined) 1 1 0 0 y y y y load digit counter (number of characters to be displayed) 1 1 1 z z z z z load duty cycle (luminance level control) notes: 1. "xxxx" - 4 bit binary value of the digit position to be written to. 2. "yyyy" - 4 bit binary value of the number of characters to be displayed. 3. "zzzzz" - 5 bit binary value divided 31 times 100% equals luminance level.
part number: rev: futaba corporation US16MY02AA c of america date printed: sheet: schaumburg, il. 01/05/98 10 of 14 4.1.1 buffer pointer the buffer pointer control byte requires bits 7,6,5 and 4 to be set to 1010, respectively. this allows any specific character within the display to be modified. the character to be modified is represented by the value of bits 3 to 0, the actual value being the decimal value of the position minus 2. if no buffer pointer control byte is specified, the controller will default to position 1. for a complete list of buffer pointer values see the table below. hex byte pointer value character controlled a0 0 2 a1 1 3 a2 2 4 a3 3 5 a4 4 6 a5 5 7 a6 6 8 a7 7 9 a8 8 10 a9 9 11 aa 10 12 ab 11 13 ac 12 14 ad 13 15 ae 14 16 af 15 1 for example, to point to character position number 7, a decimal value of 5 is entered; hence, the 8 -bit byte would be: 1 0 1 0 0 1 0 1 position data value (5 represents position 7). buffer pointer control command. control data byte identifier.
part number: rev: futaba corporation US16MY02AA c of america date printed: sheet: schaumburg, il. 01/05/98 11 of 14 4.1.2 digit counter the digit counter control byte requires bits 7,6,5 and 4 to be set to 1100, respectively. this is used to define the number of character positions to be controlled. this byte is normally used only during initialization routines. the binary value of the data corresponding to bits 3 thru 0 determines the actual number of characters to be controlled. when all 16 characters are to be controlled, bits 3 thru 0 should be set to 0. if less than 16 characters are used, a number corresponding to the actual number of characters to be controlled should be entered. for example, if six characters are to be controlled, the full 8 bit byte would be: 1 1 0 0 0 1 1 0 number of characters (6) to be controlled. digit counter control command control data byte identifier. 4.1.3 duty cycle counter control the duty cycle control byte requires bits 7,6, and 5 to be set to 111, respectively. the value of the data corresponding to the remaining bits determines the luminance level of the display. the duty cycle control byte contains a five bit numeric field (bits 4 to 0) that allows the 'on' time for all digits to be modified. luminance levels are available in 1/31 or 3.2% steps. a binary value of 31 represents maximum luminance, while a value of 0 places the output drivers into the "off" state and blanks the display. for example, a binary value of 24 would force the display's luminance level to be 77% of maximum luminance, and the full 8 -bit byte would be: 1 1 1 1 1 0 0 0 timing data. (a value of 24) duty cycle control command. control data byte identifier.
part number: rev: futaba corporation US16MY02AA c of america date printed: sheet: schaumburg, il. 01/05/98 12 of 14 4.2 writing character data bytes character data bytes are loaded into the data buffer as 8 bit bytes, with the c -bit (bit 7) set to 0. the 64 available data bytes are shown in figure 6 on page 13, with their corresponding ascii characters. the display buffer pointer is automatically incremented before each character data byte is stored. decimal points and commas will not cause the buffer pointer to increment, and are therefore always associated with the character data byte previously entered. if it is desirable to place characters out of sequence, that is not from position 1 to 16, then each character data byte must be preceded by the appropriate positional data through the use of the buffer pointer control byte. 4.3 power-on reset once vcc has stabilized after power up, a 100us active low pulse must be applied to the reset\ input to initialize the module. the following conditions are established after a reset\ pulse has been applied. 1) the duty cycle is set to 0 (this blank s the display). 2) the digit counter is set to 16 characters. 3) the buffer pointer is set to point to the left most character (position 1).
part number: rev: futaba corporation US16MY02AA c of america date printed: sheet: schaumburg, il. 01/05/98 13 of 14 figure 6. character codes
part number: rev: futaba corporation US16MY02AA c of america date printed: sheet: schaumburg, il. 01/05/98 14 of 14 5.0 interface connections connector j1 bergstick p/n: 67996110 pin # pin function 1 vcc 2 ground 3 sclk 4 ground 5 data 6 ground 7 reset\ 8 ground 9 n.c. 10 ground

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