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TT1620 2014/10/30 page j 1of 14 version j 1.2 led driver (8 x 6)
TT1620 2014/10/30 page j 2of 14 version j 1.2 . general description j TT1620 is a led controller driver. eight segment output lines, six grid output lines, display memory, pulse width control circuit, 3 wire interfac e circuit are all incorporated into a single chip to build a highly reliable peripheral dev ice for a single chip microcomputer. features j ? display mode j 8 segment x 6 grid ? 8 step dimming adjustment ? build-in rc oscillator ? serial interface for clock, data input/ out put, strobe pins ? cmos technology ? low power consumption ? sop20 package (TT1620) .pin assignment j TT1620
TT1620 2014/10/30 page j 3of 14 version j 1.2 . pin description j pin?name? i/o? pin?description dio? i/o? data?input?pin?:?this?pin?inputs?serial?data?at?the?rising?edge ?of?the?shift?clock? (starting?from?the?lower?bit)? data?output?pin?(n\channel,?open\drain)? cl k ?i? clock?input?pin?this?pin?reads?s erial?data?at?the?rising?edge?a nd?outputs?data?at? the?falling?edge.? stb? i? serial?interface?strobe?pin the?data?input?after?the?stb?has ?fallen?is?processed?as?a?comma nd.?when?this? pin?is?high",?clk?is?ignored.? vdd? p? power?suppl y seg1?~seg8? o? segment?output?pins?(p\channel,?open?drain) gnd? p? ground?pin? gr1?~?gr6? o? grid?output?pins equivalent circuits for inputs and outputs j
TT1620 2014/10/30 page j 4of 14 version j 1.2 . block diagram j
TT1620 2014/10/30 page j 5of 14 version j 1.2 function description commands a command is the first byte (b0 to b7) inputted to TT1620 via the dio pin after stb pin has changed from high to low state. if for some reason the stb pin is setting to high while data or commands are being transmitted, the serial communication is initialized, and the data/commands being transmitted are considered invalid. b7 b6 commands 0 0 display mode setting commands 0 1 data setting commands 1 0 display control commands 1 1 address setting commands 1: display mode setting command TT1620 provides a display mode setting as shown in the diag ram below: as stated earlier a command is the first one byte (b0 to b7) transmitted to tt1628/tt1668 via the dio pin when stb is low. however, for these commands, the bit 3 to bit 6 (b2 to b5) are ignored, bit 7 & bit 8 (b6 to b7) are given a value of 0. 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, therefore, nothing happens. when power is turned on, the 7-grid, 10-segment modes is selected. msb lsb b7 b6 b5 b4 b3 b2 b1 b0 display mode 0 0 -- -- -- -- 1 0 6 digits, 8 segments 2: data setting commands the data setting commands executes the data write or data read modes for TT1620. the data setting command, the bits 5 and 6 (b4, b5) are ignored, bit 7 (b6) is given t he value of 1 while bit 8 (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. msb lsb 0 1 - - b3 b2 b1 b0 b1:b0 : data write & read mode settings: 0 0 : write data to display mode 1 0 : read key data b2 : data write & read mode settings: 0 : increment address after data has been written 1 : fixed address b3 : mode settings: 0 : normal operation mode 1 : test mode
TT1620 2014/10/30 page j 6of 14 version j 1.2 3: address setting commands address setting commands are used to set the address of t he display memory. the address is considered valid if it has a value of 00 h to 0d h . if the address is set to 0e h or higher, the data is ignored until a valid address is set. when power is turned on, the address is set at 00 h . please refer to the diagram below. msb lsb 1 1 - - b3 b2 b1 b0 b3:b0 : address: 00 h to 0d h seg1 seg2 seg3 seg4 seg5 seg6 seg7 seg8 b0 b1 b2 b3 b4 b5 b6 b7 00 h g r 1 b0 b1 b2 b3 b4 b5 b6 b7 02 h g r 2 b0 b1 b2 b3 b4 b5 b6 b7 04 h g r 3 b0 b1 b2 b3 b4 b5 b6 b7 06 h g r 4 b0 b1 b2 b3 b4 b5 b6 b7 08 h g r 5 b0 b1 b2 b3 b4 b5 b6 b7 0a h g r 6 b0 b1 b2 b3 b4 b5 b6 b7 0c h no use d 4: display control commands the display control commands are used to turn on or off a display. it 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 displayed is turned off (the key scanning is started). msb lsb 1 0 - - b3 b2 b1 b0 b2~b0 : dimming quantity settings: 000: pulse width=1/16 001: pulse width=2/16 010: pulse width=4/16 011: pulse width=10/16 100: pulse width=11/16 101: pulse width=12/16 110: pulse width=13/16 111: pulse width=14/16 b3: display settings: 0: display off 1: display on
TT1620 2014/10/30 page j 7of 14 version j 1.2
TT1620 2014/10/30 page j 8of 14 version j 1.2 serial communication format the following diagram shows the TT1620 serial communication format. the dio pin is an n-channel, open-drain output pin; therefore, it is highly recomm ended that an external pull-up resistor (1k ? to 10k ? ) must be connected to dio. reception (data/command write) transmission (data read) where: t wait (waiting time) 1s it must be noted that when the dat a is read, the waiting time (t wait ) between the rises of the eighth clock that has set the command and the falling of the first clock that has read the data is greater or equal to 1s.
TT1620 2014/10/30 page j 9of 14 version j 1.2 applications display memory is updated by incrementing add resses. please refer to the following diagram. where: command 1: display mode setting command 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 the following diagram shows the waveforms when updating specific addresses. where: command 2: data setting command command 3: address setting command data: data display data
TT1620 2014/10/30 page j 10of 14 version j 1.2 1. command 1: display mode commands 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 content of the display ram is not defined; thus, it is strongly suggested that the contents of the display ram be cleared during the initial setting.
TT1620 2014/10/30 page j 11of 14 version j 1.2 application circuit j (common cathode type) TT1620 gr1 gnd gnd gr2 gr3 gr4 gr5 stb clk dio gr6 seg8 seg7 seg6 seg5 seg4 seg3 seg2 seg1 vdd h command cathode com h f g e d c b g f e d c b a a h command cathode com h f g e d c b g f e d c b a a h command cathode com h f g e d c b g f e d c b a a h command cathode com h f g e d c b g f e d c b a a h command cathode com h f g e d c b g f e d c b a a h command cathode com h f g e d c b g f e d c b a a mcu 10k 0.1uf seg8 seg7 seg6 seg5 seg4 seg3 seg2 seg1
TT1620 2014/10/30 page j 12of 14 version j 1.2 . absolutely maximum rating ( unless otherwise stated, ta=25
, gnd=0v) characteristics symbol rating unit supply voltage v dd -0.5~7.0 v input voltage v in -0.5~v dd + 0.5 v led seg. output current i o1 -50 ma led grid. output current i o2 200 ma maximum driver output current/total i total 400 ma operating temperature t o pr -40~+85 c storage temperature t st g -65~+150 c . dc electrical characteristics (unless otherwise stated, vdd=5v, gnd=0v, ta=25
) characteristics symbol conditions min typ max unit supply voltage v dd 4.5 5 5.5 v operating current i dd led off , no load 100 200 ua input high voltage v ih 0.7vdd vdd v input low voltage v il 0 0.3vdd v output high current i ohseg1 vo=vdd-2v seg1 to seg8, -20 -25 -40 ma i ohseg2 vo=vdd-3v seg1 to seg8, -25 -30 -50 output low current i olgr vo=0.3v gr1 to gr6 100 140 ma output low current i olio vo=0.4v , dio 4 ma segment out high current tolerance i tolsg vo=v dd -3v(v dd =5v) vo=v dd -2v(v dd =3v) seg1 to seg8, 5 % input high voltage v ih clk,dio,stb 0.7vdd vdd v input low voltage v il clk,dio,stb gnd 0.3 vdd v
TT1620 2014/10/30 page j 13of 14 version j 1.2 . ac electrical characteristics characteristics symbol conditions min typ max unit oscillation frequency f osc 350 500 650 khz propagation delay time t plz clk dio cl=15pf , rl=10k ? 300 ns t pzl 100 output rising time t tzh1 seg1 j seg8 cl=300pf 2 us t tzh2 grid1 j grid6 cl=300pf 0.5 output falling time t thz cl = 300pf segn gridn 120 us clock frequency f max duty=50% 1 mhz input capacitor c i 15 pf clock pulse width pw cl k 400 ns strobe pulse width pw stb 1 us data setup time t setup ns data hold time t hold ns clk stb t cl k -stb clk stb 1 us wait time t wait clk clk 1 us timing diagram
TT1620 2014/10/30 page j 14of 14 version j 1.2 . package information

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