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technical data 1 may 20 12 , ver. 03 l ed driver ic description the ik210 8 a are a n ode - grid led display drives 5 .0 v~18.0v with output size C 8 digit s x 14 segment s to 12 digits x 10 segments and addition key scan function. serial interface provide s connection with microprocessor. f eatures ? o peration v oltage for digital part : 3.0v ~ 5.5v ? o peration v oltage for output leds: 5 .0 v ~ 18.0v ? 7 - s tep i ndividual dimming control for each grid ? osc: built in (with external resistor) 500khz @ r=12.1k ? pulse segment c urrent: 27 ma @ 8 digits x 14 segments 39 ma @ 12 digits x 10 segments ? key scanning: 10x3 matrix ? serial interface ? operation temperature : - 40 ~ 85 c application sop - 32 lq fp - 32 p in description ik2108 a (32 pins) ik210 8 a ? washing machine,refregerator, microwave oven, conditioner and other ordering information device operating temperature range package shipping IK2108Ad w t a = - 40 ? to 85 ? c sop 32 tube IK2108Ad wt sop 32 tape&reel IK2108A lq lqfp - 32 tape&reel 1 r c u r d i / o c l k s t b k 1 k 2 v d d s g 1 / k s 1 g n d g r 1 i k 2 1 0 8 a 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 3 2 3 1 3 0 2 9 2 8 2 7 2 6 2 5 2 4 2 3 2 2 2 1 2 0 1 9 1 8 1 7 k 3 s g 2 / k s 2 s g 3 / k s 3 s g 4 / k s 4 s g 5 / k s 5 s g 6 / k s 6 s g 7 / k s 7 s g 8 / k s 8 s g 1 0 / k s 1 0 s g 9 / k s 9 s g 1 1 / g r 1 2 s g 1 2 / g r 1 1 s g 1 3 / g r 1 0 s g 1 4 / g r 9 v c c g r 2 g r 3 g r 4 g r 5 g r 6 g r 7 g r 8
IK2108A 2 may 20 12 , ver. 03 pin name i/o description pin sop - 32 lqfp - 32 rcur i/o a resistor is connected to this pin to determine the output currents and oscillation frequency. 1 30 di/o i/o data input - output pin this pin inputs serial data at the rising edge of the shift clock (starting from the bit) data output pin - n - channel, open - drain this pin outputs serial data at the falling edge of the shift clock 2 31 clk i clock input pin this pin reads serial data at the rising edge and output data at the falling edge. 3 32 stb i serial interface strobe pin the data input after the stb has fallen is processed as a command. when this pin is high, clk is ignored. 4 1 k1 to k3 i key data input pins the data sent to these pins are latched at the end of the d isplay cycle. (internal pull - up resistor) 5 - 7 2 - 4 vdd - power supply for digital part 8 5 vcc - power supply for output part 24 21 sg1/ks1 to sg10/ks10 o segment output pins (n - channel open drain) also acts as the key source 10 - 19 7 - 16 sg11/gr12 to sg14/gr9 o segment / grid output pins 20 - 23 17 - 20 gr8 to gr1 o grid output pins (p - channel, open drain) 25 - 32 22 - 29 gnd - ground pin 9 6 block diagram s e r i a l d a t a i n t e r f a c e o s c d i s p l a y m e m o r y c o n t r o l t i m i n g g e n e r a t o r k e y m a t r i x m e m o r y c u r r e n t r e f e r e n c e v o l t a g e r e f e r e n c e d i m m i n g c i r c u i t s e g m e n t d r i v e r / k e y s c a n o u t p u t / g r i d d r i v e r g r 1 g r 2 g r 3 g r 4 g r 5 g r 6 g r 7 g r 8 s g 1 0 / k s 1 0 s g 9 / k s 9 s g 1 1 / g r 1 2 s g 1 2 / g r 1 1 s g 1 3 / g r 1 0 s g 1 4 / g r 9 s g 1 / k s 1 s g 2 / k s 2 s g 3 / k s 3 s g 4 / k s 4 s g 5 / k s 5 s g 6 / k s 6 s g 7 / k s 7 s g 8 / k s 8 g n d v c c v d d k 1 k 2 k 3 r g n d r c u r d i / o c l k s t b
IK2108A 3 may 20 12 , ver. 03 input / output configurations the schematic diagrams of the input and output circuits of the logic section are shown below. input pins: clk, stb input pins: k1, k2 , k3 output pins: gr 1 to gr 8 v d d g n d
IK2108A 4 may 20 12 , ver. 03 output pins: sg 1 /ks1 to sg 10/k s10 output pins: sg11/gr12 to sg14/gr 9 input - output pin: di/o g n d
IK2108A 5 may 20 12 , ver. 03 functional description commands a command is the first byte (b0 to b7) inputted to ik210 8 a via di/o pin after stb pin has changed f rom high to low state. if for some reason the stb pin is set high while data or commands a re being transmitted, the serial communicati on is initialized, and the data commands being transmitted are considered invalid. command 1: display mode setting commands ik2108 a provides 5 display m odes settin g as shown in the diagram below. as stated earlier a command is the first one byte (b0 to b7) transmitted to ik210 8 a via the di/o pin when stb is low. however, for these commands, bit 5 to bit 8 (b4 to b7) are given a value of 0. the displa y mode setting commands determine the number of segments and grids are used (14 to 10 segments, 8 to 12 grids). a display commands on must be executed in order to resume display. if the same mode setting is selected, no command execution is take place, t herefore, nothing happens. the display mode setting commands are also used to turn on or off the display. please refer to the diagram below. whe n the power is turned on, the display is turned off (b3 is 0) and the mode 111 is selected (b2 to b0 are 1 ) . display mode settings: 011 : 12 grids, (10 segments) 100: 11 grids, ( 11 segments) 101: 10 grids, (1 2 segments) 110: 9 grids, (1 3 segments) 111 : 8 grids, (1 4 segments)
IK2108A 6 may 20 12 , ver. 03 command 2 : data setting commands the data setting commands executes the data write mode for ik2108 a . the data setting command, the bits5 and 6 (b4, b5) are given the value of 0. , bit7 (b6) is given the value of 1 while bit8 (b7) is given the value of 0. please refer to the diagram below. when power is turned on, bit 4 to bit 1 (b3 to b0) are given the value of 0. read data from command register: dout 1 st byte 2 nd byte b0 b1 b2 b3 b4 b5 b6 b7 b0 b1 b2 b3 b4 b5 b6 b7 b0 - b3 of command1 b0 - b3 of command2 b0 - b5 of command3 dont care command 3 : address setting commands address setting commands are used to set the address of the display memory. the address is considered valid if it has a value of 00h to 2f h. if the address is set to 3 0 h or higher, the data is ignored until a valid address is set. when power i s turned on, the address is set at 00h. please refer to the diagram below.
IK2108A 7 may 20 12 , ver. 03 display mode and ram address data transmitted from an external device to ik210 8 a via the serial interface are stored in the display ram and are assigned addresses. when the p ower is turned on, the memory is set at 0. the ram addresses of ik210 8 a are given below i n 8 bit unit. dimming sg1 sg 4 sg 5 sg 8 sg 9 sg 14 gr 1 00h l 00h u 01h l 01h u 02h m 03 gr 2 04h l 04h u 05h l 05h u 06h m 07 gr3 08h l 08h u 09h l 09h u 0ah m 0b gr4 0ch l 0ch u 0dh l 0dh u 0eh m 0f gr5 10h l 10h u 11h l 11h u 12h m 13 gr6 14h l 14h u 15h l 15h u 16h m 17 gr7 18h l 18h u 19h l 19h u 1ah m 1b gr8 1ch l 1ch u 1dh l 1dh u 1eh m 1f gr9 20h l 20h u 21h l 21h u 22h m 23 gr10 24h l 24h u 25h l 25h u 26h m 27 gr11 28h l 28h u 29h l 29h u 2ah m 2b gr12 2ch l 2ch u 2dh l 2dh u 2eh m 2f b0 b3 b4 b7 b0 b3 b4 b7 b0 b5 b0 b7 xxh l xxh u xxh l xxh u xxh m xx lower 4 bits highe r 4 bits lower 4 bits higher 4 bits lower 6 bits 8 bits 1st byte 2nd byte 3rd byte 4th byte din b0 b1 b2 b3 b4 b5 b6 b7 b0 b1 b2 b3 b4 b5 b6 b7 b0 b1 b2 b3 b4 b5 b6 b7 b0 b1 b2 b3 b4 b5 b6 b7 dimming dont care data for sg1 - sg 8 data for s g9 - sg 14 dont care dimming quantity settings: b2 b1 b0 pulse width 0 0 0 1/16 0 0 1 2/16 0 1 0 3/16 0 1 1 5/16 1 0 0 7/16 1 0 1 10/16 1 1 0 14/16 1 1 1 reserved
IK2108A 8 may 20 12 , ver. 03 k ey matrix & key input data stor a ge ram key matrix consists of 10 x 3 array as s hown below: each data entered by each key (or any combination of keys) is stored as follows and read by a read command, starting from the last significant bit. when the most significant bit of the data (b0) has been read, the least significant bit of the next data (b7) is read. k1 k2 k3 k1 k2 k3 sg 1/ks1 sg 2/ks2 x 1st byte read sg 3/ks3 sg 4/ks4 x 2nd byte read sg 5/ks5 sg 6/ks6 x 3rd byte read sg 7/ks7 sg 8/ks8 x 4th by te read sg 9/ks9 sg 10/ks10 x 5th byte read b0 b1 b2 b3 b4 b5 b6 b7 key press=1, key no press=0 read. k 1 k 2 k 3 s g 1 / k s 1 s g 2 / k s 2 s g 3 / k s 3 s g 4 / k s 4 s g 5 / k s 5 s g 6 / k s 6 s g 7 / k s 7 s g 8 / k s 8 s g 9 / k s 9 s g 1 0 / k s 1 0
IK2108A 9 may 20 12 , ver. 03 scanning and display timing
IK2108A 10 may 20 12 , ver. 03 serial commun ication format the following diagram shows the serial communication format. reception (data/command write) transmission (data read) stb di/o clk 1 2 3 7 8 if data continues b0 b1 b2 b6 b7
IK2108A 11 may 20 12 , ver. 03 switching characteristic waveform switching characteristics wavefo rm is given below.
IK2108A 12 may 20 12 , ver. 03 ap p lications display memory is updated by incrementing addresses. please refer to the following diagram. where: command 1: display mode setting command 2: data setting command command 3: address se tting command data 1 to n : transfer display data (48 bytes max.) the following diagram shows the waveforms when updating specific addresses. where: command 2 -- data setting command command 3 -- addre ss setting command data -- display data
IK2108A 13 may 20 12 , ver. 03 recommended software programming flowchart note: 1. command 1 : display mode setting 2. command 2 : data setting commands 3. command 3 : address setting commands 4 . when ic power is applied for the first time, the contents of the display ram are not defined: thus, it is strongly suggested that the contents of the display ram must be cleared during the initial setting.
IK2108A 14 may 20 12 , ver. 03 absolute maximum ratings (unless otherwise state d, ta=25 c , gnd=0v) parameter symbol rating units supply voltage vcc - 0.5 to +18 .0 v supply voltage v dd - 0.5 to +6.0 v logic input voltage v i - 0.5 to v dd +0.5 v driver output current/pin i o hgr - 4 68 ma i olsg 46.8 ma maximum driver output current/tota l i total 4 70 ma operation temperature topr - 40 ~ +85 storage temperature tstg - 65 ~ 150 * stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only and functional operation of the device at these or any other conditions beyo nd those indicated under recommended operating conditions is not implied. exposure to absolute - maximum - rated conditions for extended periods may affect device reliability. recommended operating range (unless otherwise stated, ta= - 40 to +85 c , gnd=0v) parameter symbol min typ max unit supply voltage vcc 5 .0 1 2 .0 1 5 .0 v logic supply voltage v dd 3.0 5.0 5.5 v high - level input voltage v ih 0.7v dd . v dd v low - level input voltage v il 0 . 0.3 v dd v
IK2108A 15 may 20 12 , ver. 03 electrical characteristics (unless other wise stated, vcc= 5 .0 ~ 18.0 v, v dd =3.3~5.5v, gnd=0v, ta= - 40 ~ 85c) parameter symbol test condition min typ max unit low - level output current i olsg vo=1.0 v sg1/ks1 to sg10/ks10 sg11/gr12 to sg14/gr9 display 8digitsx14segments 21.6 27 32.4 ma vo= 0.9 v sg1/ ks1 to sg10/ks10 display 12digitsx10segments 31.2 39 46.8 high - level output current i ohgr v o=vcc - 1.0 v r = 12.1kohm gr1 to gr8 display 8digitsx14segments - 302.4 - 378 - 453.6 ma v o=vcc - 1.1 v r = 12.1kohm gr1 to gr8 sg11/gr12 to sg14/gr9 display 12digits x10segments - 312 - 390 - 468 dynamic current i dddyn - - - 1.2 ma digital input current i dg - - 1 - + 1 ua low - level digital output current i o l dout v o = 0.4v dout 4 - - ma segment low - level output current tolerance i tolsg vo=1.0v sg1/ks1 to sg10/ks10 sg11 /gr12 to sg14/gr9 display 8digitsx14segments - - 5 % vo= 0.9 v sg1/ks1 to sg10/ks10 display 12digitsx10segments - - 5 high - level input voltage for di/o v ih - 0.7v dd - v dd v low - level input voltage for di/o v il - 0 - 0.3v dd v oscillation frequency f o sc ( v dd = 3.3 ~ 5 .5 v ) r = 12.1 k ohm 400 500 600 khz k1 to k3 pull up resistor r pu k1 to k3 v dd =5.0v 22.5 30.0 37.5 k?
IK2108A 16 may 20 12 , ver. 03 application note 1. the graph of i olsg vs. r cur is given for the case when only one segment is turn on . choosing t he external resistor r cur for the setting i olsg , make sure , that current i ohgr = (number of segments)*i olsg 390ma iolseg vs. rcur 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 5 7 9 11 13 15 17 19 rcur, (kohm) iolseg, (ma) 12grx10seg 11grx11seg 10grx12seg 9grx13seg 8grx14seg fosc vs. rcur 200 300 400 500 600 700 800 900 1000 1100 1200 1300 5 7 9 11 13 15 17 19 rcur (kohm) fosc (khz)
IK2108A 17 may 20 12 , ver. 03 2. the cell of display memory has a dead time zone. if the software program is not correct, it is possible the blinking of display. the bl inking frequency for the single segment is: , (less value is better), where C frequency of the use of the command2 (write data to display memory); g C number of g rids in used mode ; C frequency of internal osc ; C c lock frequency. so, main rule for update the display memory is do it if it really need. dont do it continually with high speed, but if it something like movie you can . o r another way is turn off the display while the co mmand of w rit e data to display memory is executed. 3. to determine the average consumption current of IK2108A, you should use the next formula (the current value during key scan period is ignore d as this value is very small i n compare with segments current): itotal(avrg) = (n* i olsg *dimming)*(m/(m+1)), w h ere n is segments number; m is grids number; dimming is dimming value (see p.7); i olsg is output segments current (see table electrical characteristics ). therefore different display configuration s will have different current consumption. lets consider the maximum case, when dimming is 14/16 and all segments and grids are used: 8 grids x 14 segments display: itotal(avrg)=(14*27ma(typical value)*14/16)*(8/9)=294ma; 12 grids x 10 segments display: itotal(avrg)=(10*39ma(typical value)*14/16)*(12/13)=315ma. ) * 5 . 0 1 ( * 256 2 clk osc command max blink f f g f f ? ? 2 command f osc f clk f
IK2108A 18 may 20 12 , ver. 03 application circuit (for 8grid x 14segment display) recommend value: c1&c 2 0.1uf - ceramics r 160ohm 0.5w (if one diode is conne cted) 110ohm 0.25w (if two diodes are connected) r c u r d i / o c l k s t b k 1 k 2 v d d s g 1 / k s 1 g n d g r 1 i k 2 1 0 8 a k 3 s g 2 / k s 2 s g 3 / k s 3 s g 4 / k s 4 s g 5 / k s 5 s g 6 / k s 6 s g 7 / k s 7 s g 8 / k s 8 s g 1 0 / k s 1 0 s g 9 / k s 9 s g 1 1 / g r 1 2 s g 1 2 / g r 1 1 s g 1 3 / g r 1 0 s g 1 4 / g r 9 v c c g r 2 g r 3 g r 4 g r 5 g r 6 g r 7 g r 8 1 2 . 1 k m c u 1 ~ 1 0 k + 5 v s 1 s 2 s 3 s 4 s 5 s 6 s 7 s 8 s 9 s 1 0 k 1 k 2 k 3 s 1 s 2 s 3 s 4 s 5 s 6 s 7 s 8 s 1 4 s 1 3 s 1 2 s 1 1 s 1 0 s 9 g 1 g 2 g 3 g 4 g 5 g 6 g 7 g 8 r r r r r r r r r r r r r k 1 k 2 k 3 + 1 5 v c 2 c 1 g 1 g 2 g 3 g 4 g 5 g 6 g 7 g 8 d i g i t 1 d i g i t 2 d i g i t 3 d i g i t 4 d i g i t 5 d i g i t 6 d i g i t 7 d i g i t 8 s 1 4 s 1 3 s 1 2 s 1 1 s 1 0 s 9 s 1 s 2 s 3 s 4 s 5 s 6 s 7 s 8 s e g 1 4 s e g 1 3 s e g 1 2 s e g 1 1 s e g 1 0 s e g 9 s e g 8 s e g 7 s e g 6 s e g 5 s e g 4 s e g 3 s e g 2 s e g 1 8 - g r i d x 1 4 s e g m e n t ( c o m m o n a n o d e ) d d d d d d d d d d r
IK2108A 19 may 20 12 , ver. 03 common anode type led panel c o m / d i g i t a l ( g r i d ) s e g 1 s e g 2 s e g 3 s e g 4 s e g 5 s e g 6 s e g 7 s e g 8 a b c d e f g h a b c d e f g h
IK2108A 20 may 20 12 , ver. 03 package dimension lqfp - 32
IK2108A 21 may 20 12 , ver. 03

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