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ldt inc. we bldg. 5f, 126 - 33 han - dle 1ro, seobuk - gu, cheonan, chungnam, korea, 331 - 220 tel. +82 41 520 730 fax. +82 41 520 7337 www.ldt.co.kr 1 ver. 4 . 0 ld 1960a 9 segment x 7 grid led driver with key scan ver. 4.0 / feb . 20 12 this document is a general product description and is subject to change without notice. ldt inc. does not assume any responsibility use of circuits described. ld 1960a 9 segment x 7 grid led driver with key scan
ldt inc. we bldg. 5f, 126 - 33 han - dle 1ro, seobuk - gu, cheonan, chungnam, korea, 331 - 220 tel. +82 41 520 730 fax. +82 41 520 7337 www.ldt.co.kr 2 ver. 4.0 ld 1960a 9 segment x 7 grid led driver with key scan LD1960A revision history version contents date 1.0 - first version 2011. 06. 20 2.0 - key scan read sequence change 4byte repeat ? 8byte repeat 2011 . 08. 08 3.0 - . k1 pin key scan function disable & pin description changed - . add to dip type package (p23) 2011. 11. 03 4.0 - . vih & vil range change (p7) vih : 0.5vdd, vil : 0.2vdd ? vih : 0.6vdd, vil : 0.4vdd 2012. 02. 02
ldt inc. we bldg. 5f, 126 - 33 han - dle 1ro, seobuk - gu, cheonan, chungnam, korea, 331 - 220 tel. +82 41 520 730 fax. +82 41 520 7337 www.ldt.co.kr 3 ver. 4.0 ld 1960a 9 segment x 7 grid led driver with key scan description the LD1960A is specifically designed for led and led display drivers. the LD1960A has 9 to 6 segment output lines, 7 to 4 grid output lines, one display memory, control circuit, 3 line serial data interface, and 6 x 2 matrix key scan. those functions are all incorporated into a single chip to build a highly reliable peripheral device for a single chip microcomputer. it is very convenient to control for numeric display. LD1960A?s pin assignments and application c ircuit are optimized for easy pcb layout and cost saving advantages. features ? cmos technology ? segment output line selection by command : 6 ~ 9 ? grid output line selection by command : 7 ~ 4 ? operation voltage : 5v ? low power consumption ? 8 - step dimming control by command ? serial interface for clock, data input/output, strobe pins ? 20 - pin tssop package, 20 - pin dip package application ? segment led display : vcr, dvd, mwo ordering informatio n device name segment grid key scanning pkg type LD1960A - tss 6~9 segment 7~4grid 6x1 matrix 20tssop LD1960A - dip 6~9 segment 7~4grid 6x1 matrix 20 dip
ldt inc. we bldg. 5f, 126 - 33 han - dle 1ro, seobuk - gu, cheonan, chungnam, korea, 331 - 220 tel. +82 41 520 730 fax. +82 41 520 7337 www.ldt.co.kr 4 ver. 4.0 ld 1960a 9 segment x 7 grid led driver with key scan pin configuration pin description pin name i/o description pin no. k1 i user dont use. it is only test mode pin this pin has pull down resistor(4.2k) internally. 1 dio i/o serial data input and n - channel open drain output pin this pin inputs serial data at clk rising edge. this pin outputs at clk falling edge. 2 clk i serial clock input pin input data is triggered at rising edge. output data is triggered at falling edge. 3 stb i when this pin is high, clk signal is ignored. the data input after the stb has fallen is processed as a command. 4 k2 i key scan input pin. this pin is operated with seg1/ks1 to seg6/ks6 pins. this pin has pull down resistor internally. 5 vdd - power supply 6 seg1/ks1 to seg6/ks6 o segment output pins. ( p - channel open drain) also key scan source pins. 7,8,9,10 11,12 seg12/gr7 o segment / grid output pin 13 seg13/gr6 o segment / grid output pin 14 seg14/gr5 o segment / grid output pin 15 gr4,gr3,gr2,gr1 o grid output pin 16,17,19,20 gnd - ground pin 18
ldt inc. we bldg. 5f, 126 - 33 han - dle 1ro, seobuk - gu, cheonan, chungnam, korea, 331 - 220 tel. +82 41 520 730 fax. +82 41 520 7337 www.ldt.co.kr 5 ver. 4.0 ld 1960a 9 segment x 7 grid led driver with key scan block diagram
ldt inc. we bldg. 5f, 126 - 33 han - dle 1ro, seobuk - gu, cheonan, chungnam, korea, 331 - 220 tel. +82 41 520 730 fax. +82 41 520 7337 www.ldt.co.kr 6 ver. 4.0 ld 1960a 9 segment x 7 grid led driver with key scan input/output pins schematic diagram
ldt inc. we bldg. 5f, 126 - 33 han - dle 1ro, seobuk - gu, cheonan, chungnam, korea, 331 - 220 tel. +82 41 520 730 fax. +82 41 520 7337 www.ldt.co.kr 7 ver. 4.0 ld 1960a 9 segment x 7 grid led driver with key scan absolute maximum ratings (unless otherwise stated, ta=25, gnd=0v) parameter symbol rating unit supply voltage vdd - 0.5 to +7.0 v logic input voltage vi - 0.5 to vdd+0.5 v driver output current/pin iolgr +250 ma iohseg - 50 ma maximum driver output current/total itotal 400 ma recommended operating range (unless otherwise stated, ta= - 40 to +85, gnd=0v) parameter symbol min. typ. max. unit logic supply voltage vdd 2.7 5 5.5 v dynamic current (see note) idddyn . . 5 ma high - level input voltage vih 0.6vdd . vdd v low - level input voltage vil 0 . 0.4vdd v note : test condition : set display control commands = 80h (display turn off state) electrical characteristics (unless otherwise stated, v dd =5v, gnd=ov, ta=25) parameter symbol test condition min. typ. max. unit high - level output current iohsg1 v o = v dd - 2v seg1 to seg6,seg14/gr5 seg13/gr6,seg12/gr7 - 20 - 25 - 40 ma iohsg2 v o = v dd - 3v seg1 to seg6,seg14/gr5 seg13/gr6,seg12/gr7 - 25 - 30 - 50 ma low - level output current iolgr v o = 0.3v gr1 to gr4,seg14/gr5 seg13/gr6,seg12/gr7 100 140 - ma low - level output current ioldout v o = 0.4v dio 4 - - ma segment high - level output current tolerance itolsg v o = v dd - 3v seg1 to seg6,seg14/gr5 seg13/gr6,seg12/gr7 - - 5 % high - level input voltage vih - 0.6vdd - vdd v low - level input voltage vil - 0 - 0.4vdd v oscillation frequency fosc - 350 500 650 khz k1 to k2 pull down resistor ksr vdd=5v 40 - 100 k
ldt inc. we bldg. 5f, 126 - 33 han - dle 1ro, seobuk - gu, cheonan, chungnam, korea, 331 - 220 tel. +82 41 520 730 fax. +82 41 520 7337 www.ldt.co.kr 8 ver. 4.0 ld 1960a 9 segment x 7 grid led driver with key scan switching characteristic waveform LD1960A switching characteristics waveform is given below.
ldt inc. we bldg. 5f, 126 - 33 han - dle 1ro, seobuk - gu, cheonan, chungnam, korea, 331 - 220 tel. +82 41 520 730 fax. +82 41 520 7337 www.ldt.co.kr 9 ver. 4.0 ld 1960a 9 segment x 7 grid led driver with key scan seg pin resistance LD1960A seg pins resistor characteristics is given below.
ldt inc. we bldg. 5f, 126 - 33 han - dle 1ro, seobuk - gu, cheonan, chungnam, korea, 331 - 220 tel. +82 41 520 730 fax. +82 41 520 7337 www.ldt.co.kr 10 ver. 4.0 ld 1960a 9 segment x 7 grid led driver with key scan functional description commands the LD1960A has 4 kind of commands. the first command is display setting command, the second command is data setting command, the third command is address setting command and the fourth command is display control command. command 1 : display mode setting command the display mode setting command has 2bit (b1,b0) for display mode setting and 2bit (b7,b6) for commands. the 2bits(b5 ~ b4) should be fixed ?00? at any case. the 2bits (b3 ~ b2) are don?t care bit. the command bits (b7,b6) are 0,0 for command1. the display mode setting command determines the number of segments and grids. this command should be executed for display off. and the default of b1,b0 are 1,1 for power on. this status is selected 7 grids, 6 se gments . if b1,b0 are 1,0 then 6 grids 7 segments. if b1,b0 are 0,1 then 5 grids 8 segments. if b1,bo are 0,0 then 4 grids 9 segments.
ldt inc. we bldg. 5f, 126 - 33 han - dle 1ro, seobuk - gu, cheonan, chungnam, korea, 331 - 220 tel. +82 41 520 730 fax. +82 41 520 7337 www.ldt.co.kr 11 ver. 4.0 ld 1960a 9 segment x 7 grid led driver with key scan command 2 : data setting command the data setting command consists of data write mode setting, address increment mode setting and mode setting . and the default of b3 to b0 are all 0 for power on. the data write mode settings have 2bit (b1,b0) for writing data to display mode and read key scan data. and address increment mo de setting has 1bit (b2) for selecting address increment or fixed. and 3bits(b5 ~ b3) should be fixed ?000? at any case. the command bits (b7,b6) are 0,1 for command2.
ldt inc. we bldg. 5f, 126 - 33 han - dle 1ro, seobuk - gu, cheonan, chungnam, korea, 331 - 220 tel. +82 41 520 730 fax. +82 41 520 7337 www.ldt.co.kr 12 ver. 4.0 ld 1960a 9 segment x 7 grid led driver with key scan command 3 : address setting command the display memory is addressed by addres s setting command. the valid address range is 00h to 0dh. if the address is set to 0eh to 0fh, the data is ignored until a valid address is set. when power is turned on, the address is set at 00h. display mode and ram address data transmitted from an external device to LD1960A via the serial interface are stored in the display ram and are assigned addresses. the ram addresses of LD1960A are given below in 8 bit unit.
ldt inc. we bldg. 5f, 126 - 33 han - dle 1ro, seobuk - gu, cheonan, chungnam, korea, 331 - 220 tel. +82 41 520 730 fax. +82 41 520 7337 www.ldt.co.kr 13 ver. 4.0 ld 1960a 9 segment x 7 grid led driver with key scan command 4 : display control commands the display control commands are used to turn on or off a display. it is also used to set the pulse width. please refer to the diagram below. when the power is turned on, a 1/16 pulse width is selected and the display is turned off.
ldt inc. we bldg. 5f, 126 - 33 han - dle 1ro, seobuk - gu, cheonan, chungnam, korea, 331 - 220 tel. +82 41 520 730 fax. +82 41 520 7337 www.ldt.co.kr 14 ver. 4.0 ld 1960a 9 segment x 7 grid led driver with key scan display timing waveform
ldt inc. we bldg. 5f, 126 - 33 han - dle 1ro, seobuk - gu, cheonan, chungnam, korea, 331 - 220 tel. +82 41 520 730 fax. +82 41 520 7337 www.ldt.co.kr 15 ver. 4.0 ld 1960a 9 segment x 7 grid led driver with key scan key scan 1) key scan timing the key scan period is 500us at oscillator=500khz. 2) key scan operation the key scan is operated always. multiple key presses are recognized by determining whether multiple key data bits are set. 3) key scan data read sequence
ldt inc. we bldg. 5f, 126 - 33 han - dle 1ro, seobuk - gu, cheonan, chungnam, korea, 331 - 220 tel. +82 41 520 730 fax. +82 41 520 7337 www.ldt.co.kr 16 ver. 4.0 ld 1960a 9 segment x 7 grid led driver with key scan 4) key scan example if sw switch is pressed, the k2 of key input pin is high by ks2 at key scan timing. so the k2 pin input is high.
ldt inc. we bldg. 5f, 126 - 33 han - dle 1ro, seobuk - gu, cheonan, chungnam, korea, 331 - 220 tel. +82 41 520 730 fax. +82 41 520 7337 www.ldt.co.kr 17 ver. 4.0 ld 1960a 9 segment x 7 grid led driver with key scan serial commumication format the following diagram shows the LD1960A serial communication format. reception (data/c ommand write) transmission (data read)
ldt inc. we bldg. 5f, 126 - 33 han - dle 1ro, seobuk - gu, cheonan, chungnam, korea, 331 - 220 tel. +82 41 520 730 fax. +82 41 520 7337 www.ldt.co.kr 18 ver. 4.0 ld 1960a 9 segment x 7 grid led driver with key scan serial communication examples serial communication timing diagram for initialization setting. where : command 1 : display mode setting command 2 : data setting command command 3 : address setting command data 1 to n : transfer display data (14 bytes max.) command 4 : display control command memory updating timing diagram. where : command 2 : data setting command command 3 : address setting command data : display data
ldt inc. we bldg. 5f, 126 - 33 han - dle 1ro, seobuk - gu, cheonan, chungnam, korea, 331 - 220 tel. +82 41 520 730 fax. +82 41 520 7337 www.ldt.co.kr 19 ver. 4.0 ld 1960a 9 segment x 7 grid led driver with key scan recommended software programming flow chart note : 1. command 1 : display mode setting 2. command 2 : data setting commands 3. command 3 : address setting commands 4. command 4 : display control commands 5. 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.
ldt inc. we bldg. 5f, 126 - 33 han - dle 1ro, seobuk - gu, cheonan, chungnam, korea, 331 - 220 tel. +82 41 520 730 fax. +82 41 520 7337 www.ldt.co.kr 20 ver. 4.0 ld 1960a 9 segment x 7 grid led driver with key scan typical application circuit
ldt inc. we bldg. 5f, 126 - 33 han - dle 1ro, seobuk - gu, cheonan, chungnam, korea, 331 - 220 tel. +82 41 520 730 fax. +82 41 520 7337 www.ldt.co.kr 21 ver. 4.0 ld 1960a 9 segment x 7 grid led driver with key scan led panel for cathode type
ldt inc. we bldg. 5f, 126 - 33 han - dle 1ro, seobuk - gu, cheonan, chungnam, korea, 331 - 220 tel. +82 41 520 730 fax. +82 41 520 7337 www.ldt.co.kr 22 ver. 4.0 ld 1960a 9 segment x 7 grid led driver with key scan package information
ldt inc. we bldg. 5f, 126 - 33 han - dle 1ro, seobuk - gu, cheonan, chungnam, korea, 331 - 220 tel. +82 41 520 730 fax. +82 41 520 7337 www.ldt.co.kr 23 ver. 4.0 ld 1960a 9 segment x 7 grid led driver with key scan

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