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user?s guide atm 1602b liquid crystal display module
1 contents m echanica l diagram ????????????????.??? 2 absolute maximum ratings ?????????????? ?? 3 description of terminals ???????? ???????? .. .. 3 optical characteristics ????????? ????????? 4 electrical characteristics 4 dc characteristics ???? ???? . ??????? 4 ac characteristics ????????? . ????? ... 5 write cycle ????????????? . ???????? .. ? .. 5 timing characteristics ?????????? .... ??? 6 block diagram ????????? .. ??????? .. 7 display commands ???????? . ???????????? 8 reliability and lift time ???????? . ??? ??????? . 9 standard character pattern ???????? . ? ??????? . 10
2 mechanical diagram
3 absolute maximum ratings item symbol min max unit power voltage v dd - v ss 0 7.0 input voltage v in v ss v dd v operating temperature range t op 0 +50 storage temperature range t st - 20 +60 ?? *w ide temperature range is available (operating/storage temperature as wide as - 20 ?? +70/ - 30 ?? +80 ?? ) ? description of terminals pin no. pin name input/ output external connection function 1 vss ?a power vss:gnd 2 vdd ?a supply vdd: +5v 3 vo ?a v lcd adjustment 4 rs input mpu register select signal ?0?:instruction register (when writing) busy flag & address counter (when r eading) ?1?:data register (when writing & reading) 5 r/w input mpu read/write select signal ?0? for writing , ?1? for reading 6 e input mpu operation (data read/write) enable signal 7 / 10 db0 - db3 input mp u low - order lines of data bus with 3 - state, bi - directional function for use in data transaction with the mpu. these lines are not used when interfacing with a 4 - bit microprocessor. 11 / 14 db4 - db7 input mpu high - order lines of data bus with 3 - state, bi - directional function for use in data transactions with the mpu. db7 may also be used to check the busy flag. 15 / 16 led ? + ? led ? - ? input led backlight power supply led ? + ? voltage type:4.2v max : 4.5v led ? - ? : gnd
4 optical characteristics for tn type display module (t a =25 ?? , v dd =5.0v ? 0.25v) item symbol condition min. typ. max. unit viewing angle | c r ?y 4 - 25 - - deg | - 30 - 30 contr ast ratio c r - 2 - - response time(rise) t r - - 120 150 ms response time(fall) t r - - 120 150 ms for stn type display module (t a =25 ?? , v dd =5.0v ? 0.25v) item symbol condition min. typ. max . unit viewing angle | c r ?y 2 - 60 - 35 deg | - 40 - 40 contrast ratio c r - 6 - - response time(rise) t r - - 150 250 ms response time(fall) t r - - 150 250 ms electrical cha racteristics dc characteristics parameter symbol conditions min. type max. unit supply voltage for lcd v dd - v o t a =25 ?? ?a 4.6 ?a v input voltage v dd 4.7 ?a 5.5 v supply current i dd v dd =5.0v;t a =25 ?? ?a 1.5 2.5 ma input leakage curre nt i lkg ?a ?a 1.0 | a ?h? level input voltage v ih 2.2 ?a v dd v ?l? level input voltage v il twice initial value or less 0 ?a 0.6 v ?h? level output voltage v oh loh= - 0.25ma 2.4 ?a ?a v ?l? level output voltage v ol l ol=1.6ma ?a ?a 0.4 v backlight supply power v f ?a 4.2 4.5 v
5 ac characteristics read cycle (v dd =5.0v+10%,v ss =ov, t a =25 ?? ) parameter symbol test pin min. type max. unit enable cycle time t c e 500 - - enable pu lse width t w e 300 - - enable rise/fall time t r , t f e - - 25 rs,r/w setup time t su rs; r/w 100 - - ns rs.r/w address hold time t h rs; r/w 10 - - read data output delay t d db0 - db7 60 - 190 read data hold ti me t dh db0 - db7 20 - - write cycle parameter symbol test pin min. type max. unit enable cycle time t c e 500 - - enable pulse width t w e 300 - - enable rise/fall time t r ,t f e - - 25 rs,r/w setup time t su1 rs; r/w 100 - - ns rs,r/w addre ss hold time t h1 rs; r/w 10 - - data setup time t su2 db0 - db7 60 - - data hold time t h2 db0 - db7 10 - -
6 timing characteristics
7 block diagram vdd - vo: lcd driving voltage vr: 10k - 20k |? lcd controller and driver lcd panel 40 8 or 16 lcd driver vdd lcm v0 vss +5v vr gnd vdd - v0
8 display command parameter rs r/w db7 db6 db5 db4 db3 db2 db1 db0 note executing time fosc=250kh z clear display 0 0 0 0 0 0 0 0 0 1 1.64ms cursor home 0 0 0 0 0 0 0 0 1 * 1.64ms entry mode set 0 0 0 0 0 0 0 1 1/d s db1=1:increment db1=0:decrement db0=1:the display is shifted db0=0:the display is not shifted 40 | s display on/off 0 0 0 0 0 0 1 d c b db2=1:display on db2=0: display off db1=1:cursor on db1=0: cursor off db0=1:brinking on db0=0: brinking off 40 | s cursor / display shift 0 0 0 0 0 1 s/c r/l * * db3=1:shifts display one character db2=1:right shift db2=0:left shift 40 | s system s et 0 0 0 0 1 dl n f * * db4=1:8 bits db4=0:4 bits db3=1:2 lines display (1/16 duty) db3=0:1 line display db2=1:5 ? 10 dots , 1/11 duty db2=1:5 ? 7 dots , 1/8 duty 40 | s set cg ram address 0 0 0 1 cg ram address corresponds to cursor address th e address length that can be set is 64 address 40 | s set dd ram address 0 0 1 dd ram address the address length that can be set is 80 address 40 | s read busy flag/address counter 0 1 bf address counter used for both dd&cg ram address db7=1:busy (in struction not accepted) db7=0:ready(for instruction) 0 | s write data 1 0 write data 46 | s read data 1 1 read data 46 | s dd ram address: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 address for line 1 00 01 02 03 04 05 06 07 08 09 a b c d e f address for line 2 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f
9 reliability and life time 1.r eliability test evaluations and assessment* storage condition content current consumption oozing contrast other appearances operation at high temperature and humidity 40 ?? ,90% rh,240hrs twice initial value or less none more than 80% of initial value no abnormality high temperature storage 60 ?? , 240hrs twice initial value or less none more than 80% of initial value no abnormality low temperature storage - 20 ?? , 240hrs twice initial value or less more than 80% of initial value no abnormality *evaluations and assessment to be made two hours after returning to room temperature (25 ?? ? 5 ?? ). *the lcds subjected to the test must not have dew condensation. 2. liquid crystal pa nel service life 50,000 hours minimum at 25 ? 10 ?? ,45 ? 20%rh.
10 standard character pattern note: the user can specify any pattern for character - generator ram.

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