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ad7312 1/4 to 1/11 duty vfd controller/ driver & standby master/slave this datasheet contains new product information. anachip corp. reserves the rights to modify the product specification without notice. no liability is assumed as a result of the use of this product. no rights under any patent accompany the sale of the product. rev. a2 dec 29, 2003 1/12 ? features B serial interface (clk, stb, d in, d out ) B key scanning (6 4 matrices) B programming display modes (11-digit & 11-segment to 6-digit & 16-segment) B programming dimming step B high-voltage output (v dd -35v max). B 2 channels led ports. B 2-pin general-purpose input port B built-in oscillator B no external resistor necessary for driver outputs (provides pmos open-drain and pull-low resistor output) B remote signal input port B remote signal output port B 3 standby master output ports (controlled by remote standby-key, standby-key and standby scan-key) B 8 wake up master output ports (controlled by 2 remote wake_up-key, 3 wake_up scan-key, remote standby-key, standby-key and standby scan-key) B nec 6121/6122 infrared protocol support ? general description the ad7312 is a vfd (vacuum fluorescent display) controller/driver with standby controller. it is driven on a 1/4 to 1/11 duty factor (include key scan). it consists of 5 segment output lines, 6 segment/key scan output lines, 6 grid output lines, 5 segment/grid output drive lines, 2 led output ports, a display memory, a control circuit, and a key scan circuit. in addition, it includes 2 input ports, rmin and skey, rmin receives the signal form the standby-key of remote sensor, skey can be controlled by an external switch. both of them and stanby scan-key can control the output level (high) of psv port to realize the standby function. to leave the standby mode, we can use the 2 remote wake_up-key, 3 wake_up scan-key, remote standby-key, standby-key and standby scan-key to control the output level (low) of psv port to realize the wake up function. serial data is input to the ad7312 through a four-line serial interface.
ad7312 1/4 to 1/11 duty vfd controller/ driver & standby master/slave anachip corp. www.anachip.com.tw rev. a2 dec 29, 2003 2/12 ? pin assignments grid 4 grid 3 grid 2 grid 1 v dd led 4 rmbuf psv led 1 v ss osc seg 8 seg 7 seg 6 / ks 6 v dd key 4 key 3 v ee seg 16 / grid 7 grid 6 grid 5 key 2 key 1 stb clk v ss d in d out sw 4 skey rmin sw 1 seg 5 / ks 5 seg 4 / ks 4 seg 3 / ks 3 seg 2 / ks 2 seg 1 / ks 1 seg 15 / grid 8 seg 14 / grid 9 seg 13 / grid 10 seg 12 / grid 11 seg 11 seg 10 seg 9 34 35 36 37 38 39 40 41 42 43 44 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 23 24 25 26 27 28 29 30 31 32 33 use all power pins.
ad7312 1/4 to 1/11 duty vfd controller/ driver & standby master/slave anachip corp. www.anachip.com.tw rev. a2 dec 29, 2003 3/12 ? pin descriptions symbol name no. description d in data input 6 input serial data at rising edge of shift clock, starting from the low order bit. d out data output 5 output serial data at the falling edge of the shift clock, starting from low order bit. this is n-ch open-drain output pin. stb strobe 9 initializes serial interface at the rising or falling edge of the ad7312. it then waits for reception of a command. data input after stb falling is processed as a command. while command data is processed, current processing is stopped, and the serial interface is initialized. while stb is high, clk is ignored. clk clock input 8 reads serial data at the rising edge, and outputs data at the falling edge. osc oscillator pin 44 connect resistor in between this pin and vdd to set up the oscillation frequency. seg 7 to seg 11 high-voltage output (segment) 21 to 25 segment output pins seg 1 /ks 1 to seg 6 /ks 6 high-voltage output 15 to 20 multi-function pins, segment output pins (dual function as key scan source) grid 1 to grid 6 high-voltage output (grid) 32 to 37 grid output pins seg 12 /grid 11 to seg 16 /grid 7 high-voltage output (segment/grid) 26, 28 to 31 these pins are selectable for segment or grid driving. led 1 and led 4 led output 39 and 42 cmos output rmbuf remote control bu ffer 40 cmos output psv power saving output 41 cmos output key 1 to key 4 key data input 10 to 13 data input to these pins is latched at the end of the display cycle. v dd logic power 14, 38 logic power supply v ss logic ground 7, 43 connect this pin to system gnd. v ee pull-down level 27 driver power supply sw 1 and sw 4 switch input 1 and 4 these pins constitute a 2-bit general-purpose input port. rmin remote control input 2 input pin skey standby key input 3 input pin
ad7312 1/4 to 1/11 duty vfd controller/ driver & standby master/slave anachip corp. www.anachip.com.tw rev. a2 de c 29, 2003 4/12 ? ordering in formation a d7312 x x x packing blank : tray q: qfp-44l package lead blank: normal f: lead free l: lqfp-44l ? block diagram 2-bit latch d in d out clk stb r v dd 4 2 v dd (+5v) 6 11 5 5 16 11 5 v ee (-30v) v ss (0v) serial i/f 2-bit latch led1,4 osc sw 1 sw 4 key 1 to key 4 command decoder display memory 16 bits 11 words 16-bit output latch timing generator key scan key data memory (46) 11-bit shift register dimming circuit data selector grid driver segment driver seg6/ks6 seg7 seg 12 /grid 11 grid 1 grid 6 segment/grid driver seg 16 /grid 7 segment/ key scan seg1/ks1 seg11 5 6 remote control decoder clk stb rebuf psv 2
ad7312 1/4 to 1/11 duty vfd controller/ driver & standby master/slave anachip corp. www.anachip.com.tw rev. a2 dec 29, 2003 5/12 ? absolute maximum ratings (t a =25 o c,v ss =0v ) parameter symbol rating unit logic supply voltage v dd -0.5 to +7.0 v driver supply voltage v ee v dd +0.5 to v dd -40 v logic input voltage v i1 -0.5 to v dd +0.5 v vfd driver output voltage v o2 v ee -0.5 to v dd +0.5 v led driver output current i o1 +15 ma vfd driver output current i o2 -40 (grid) -15 (segment) ma operating ambient temperature t opt -25 to +85 o c storage temperature t stg -50 to +125 o c ? operating conditions (t a =0 to +70 o c,v ss =0v) parameter symbol conditions min. typ. max. unit logic supply voltage v dd 4.5 5 5.5 v high-level input voltage v ih 0.7v dd v dd v low-level input voltage v il 0 0.3v dd v driver supply voltage v ee 0 v dd -35 v ? dc characteristics (t a =0 to 70 o c, v dd =4.5 to 5.5v, v ss =0v, v ee =v dd -35v) parameter symbol conditions min. typ. max. unit high-level output voltage v oh1 led 1/ led 4 , i oh1 =-1ma 0.9v dd v low-level output voltage v ol1 led 1/ led 4 , i ol1 =12ma 1 v low-level output voltage v ol2 d out , i ol2 =2ma 0.4 v high-level output current i oh21 v o =v dd -2v, seg 1 to seg 11 -3 ma high-level output current i oh22 v o =v dd -2v, grid 1 to grid 6 seg 12 /grid 11 to seg 16 /grid 7 -15 ma driver leakage current i oleak v o =v dd -35v, driver off -10 a output pull-down resistor r l driver output 50 100 150 k high-level input voltage v ih 0.7v dd v low-level input voltage v il 0.3v dd v ? ac characteristics (t a =0 to +70 o c,v dd =4.5 to 5.5 v, v ee =-30v) parameter symbol conditions min. typ. max. unit oscillation frequency f osc r=51 k 350 500 650 kh z maximum clock frequency f max. duty=50% 1 mh z clock pulse width pw clk 500 ns strobe pulse width pw stb 1 s data setup time t setup 100 ns data hold time t hold 100 ns clock-strobe time t clk-stb clk stb 1 s wait time t wait clk clk (note) 1 s t phz clk d out 300 ns propagation delay time t pzl c l =15pf,r l =10 k 100 ns rise time t tzh 2 s fall time t thz c l =300pf seg n ,grid n 160 s note : refer to page 8.
ad7312 1/4 to 1/11 duty vfd controller/ driver & standby master/slave anachip corp. www.anachip.com.tw rev. a2 dec 29, 2003 6/12 ? timing diagram (1) serial communication format reception (command/write data) if data continues stb b7 b6 b2 b1 b0 d in 8 7 3 2 1 clk transmission (read data) 6 5 4 3 2 1 t wait 8 7 6 5 4 3 2 1 b7 b6 b5 b4 b3 b2 b1 b0 b0 b1 b2 b3 b4 b5 stb d in clk d out data is read. a data read command is set. (note) because the d out pin is an n-ch, open-drain output pin, be sure to connect an external pull-up resistor to this pin (1k to 10 k ). note : when data is read, a wait time t wait of 1 s is necessary since the rising of the eighth clock that has set the command, until the falling of the first clock that has read the data.
ad7312 1/4 to 1/11 duty vfd controller/ driver & standby master/slave anachip corp. www.anachip.com.tw rev. a2 dec 29, 2003 7/12 (2) key scanning and display timing on cycle of key scanning consists of one frame, and data in a 6 4 matrix is stored in ram. 1/16 t disp 1 frame = t disp (n+1) t disp 500 s seg output grid1 grid2 grid3 gridn dig1 dig2 dig3 dign key scan data dig1 123456 ? switching characteristic waveforms fosc 50% osc t thz t tzh stb clk d in d out sn/gn 90% 10% pw clk pw clk t hold t setup t plz pw stb t clk-stb t pzl
ad7312 1/4 to 1/11 duty vfd controller/ driver & standby master/slave anachip corp. www.anachip.com.tw rev. a2 dec 29, 2003 8/12 applications updating display memory by incrementing address command 4 data n command 3 command 2 command 1 data 1 d in clk stb command 1: sets display mode command 2: sets data(write data to display memory) command 3: sets address data 1 to n: transfers display data (22bytes max.) command 4: controls display updating specific display memory and write registers data command 2 command 2 data command 1 d in clk stb command 1: sets data command 2: sets address data: display data
ad7312 1/4 to 1/11 duty vfd controller/ driver & standby master/slave anachip corp. www.anachip.com.tw rev. a2 dec 29, 2003 9/12 reading specific registers addressn commandn data1 command 2 command 1 command2 d in clk stb address2 data2
ad7312 1/4 to 1/11 duty vfd controller/ driver & standby master/slave anachip corp. www.anachip.com.tw rev. a2 dec 29, 2003 10/12 ? package information (1) package type: qfp-44l dimension in millimeter (mm.) 33 23 22 12 11 1 44 34 13.2 0.5 10.0 0.5 13.2 0.5 0.15 typ. 2.7(max.) 1.6 typ. 0.88 typ. 0.8 typ. 0.3 typ. 10.0 0.5
ad7312 1/4 to 1/11 duty vfd controller/ driver & standby master/slave anachip corp. www.anachip.com.tw rev. a2 dec 29, 2003 11/12 (2) package type: lqfp-44l pin 1 indent e1 e d d1 l1 l 0.25 gage plane r0.08 min. detail a detail a a a2 a1 y b e 12 o (4x) c ( top view ) dimensions in millimeters dimensions in inches symbol min. nom. max. min. nom. max. a - - 1.60 - - 0.063 a1 0.05 0.10 0.15 0.002 0.004 0.006 a2 1.35 1.40 1.45 0.053 0.055 0.057 b 0.30 0.37 0.45 0.012 0.015 0.018 c 0.09 - 0.20 0.004 - 0.008 e 11.50 12.00 12.50 0.453 0.472 0.492 e1 9.50 10.00 10.50 0.374 0.394 0.413 d 11.80 12.00 12.20 0.465 0.472 0.480 d1 9.90 10.00 10.10 0.390 0.394 0.398 e - 0.80 - - 0.031 - l 0.45 0.60 0.75 0.018 0.024 0.030 l1 - 1.00 - - 0.039 - 0 ? 3.5 ? 7 ? 0 ? 3.5 ? 7 ? y 0.00 - 0.08 0.000 - 0.003
ad7312 1/4 to 1/11 duty vfd controller/ driver & standby master/slave anachip corp. www.anachip.com.tw rev. a2 dec 29, 2003 12/12 ? marking information ac ad7312 x part number logo id code: internal year: top view "02" = 2002 "01" = 2001 xx xx xxx nth week: 01~52 blank: normal f: lead free package qfp44/lqfp44

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