turning ideas into reality abcircuits www.abcircuits.com pob 123 new hill nc 27562 (919) 290 - 7104 part number HEX7 copyright ? 2014 abcircuits. revised september 2014 page 1 of 6 HEX7 ic bcd or hexadecimal to seven segment controller general description the HEX7 ic is a two digit bcd or h exadecimal to seven segment conver t er. eight bits of parallel input is converted to drive two seven segment displays. output polarity control is provided. the HEX7 ic has internal pull resistors on inputs to mini mize additional parts. a .1 uf bypass capacitor is sug gested across the vdd and vss pins. the part uses the standard 28 pin .3 inch width soic and dip package s . features hex adecimal to seven segment display converter . bcd to seven segment display converter . no external parts required. low power consumption 5 ma typical. supply voltage 2.4 to 5.25 volts. on chip input resistors. output polarity select . ttl and cmos compatible. part is in full production. soic and dip 28 pin package. rohs compliant . low emi . applications numeric displays . controls . price signs .
turning ideas into reality abcircuits www.abcircuits.com pob 123 new hill nc 27562 (919) 290 - 7104 part number HEX7 copyright ? 2014 abcircuits. revised september 2014 p age 2 of 6 example circuit HEX7 15 9 16 17 18 19 3 6 7 8 10 11 13 14 22 12 20 23 28 21 4 1 2 5 24 25 26 27 serra nc segrc segre segrg nc r8 seglf segld seglb pol segrf segrb vss segle segrd segla seglg vdd seglc r2 l8 l2 nc r1 r4 l1 l4 vcc vcc ( parallel input common anode a b c d e f g right display g f e d c b a com a b c d e f g left display g f e d c b a com common anode vcc connection diagram HEX7 15 9 16 17 18 19 3 6 7 8 10 11 13 14 22 12 20 23 28 21 4 1 2 5 24 25 26 27 segra nc segrc segre segrg nc r8 seglf segld seglb pol segrf segrb vss segle segrd segla seglg vdd seglc r2 l8 l2 nc r1 r4 l1 l4 pin description pin # description pin # description 1 l8 28 vdd 2 l2 2 7 l4 3 r8 26 l1 4 r 2 25 r 4 5 nc 24 r1 6 segl f 23 segl g 7 segl d 22 segl e 8 segl b 21 segl c 9 nc 20 segl a 10 pol 19 nc 11 segr f 18 segr g 12 segr d 17 segr e 13 segr b 16 segr c 14 vss 15 segr a
turning ideas into reality abcircuits www.abcircuits.com pob 123 new hill nc 27562 (919) 290 - 7104 part number HEX7 copyright ? 2014 abcircuits. revised september 2014 p age 3 of 6 pol polarity input. if this pin is open or high , the ?on? segments will have a high level on the seg outputs of the chip. if this pin is low or grounded ?on? segments will output as a low on the seg pins . this pin is read once at power up and has a built in pull up resistor. segla, seglb, segl c, se gld, segle, seglf, segl g segra, segrb, segrc, segrd, segre, segrf, segr g segl is the left hand of the two displays. segr is the right hand of the two displays if the pol pin is open or hi, this seg outputs will be high when a segment is on. if the pol pin i s low or grounded, the seg outputs will be low when a segment is on. these are the seven segmen t outputs to each individual display an e xternal driver or current limiting resistor is required for each segment. if you are using only a resistor, it must be sized to limit source current to 5 ma maximum per pin or sink current to 9 ma per pin. see also the segment table, and the seven segment translation table. l1, l2, l4, l8 r1, r2, r4, r8 parallel input of the data to be displayed. l1 - 4 is the left di git, r1 - 4 is the right digit. 1?s are least significant bit, and 8?s are most significant bit. vss connect to system ground. vdd connect to supply voltage of 2.4 to 5 volts . a .1 uf decoupling capacitor to ground is recommended. notes: make n o connec tion to the nc pins . pin s 9 and 19 must be left unconnected . segment identification table
turning ideas into reality abcircuits www.abcircuits.com pob 123 new hill nc 27562 (919) 290 - 7104 part number HEX7 copyright ? 2014 abcircuits. revised september 2014 p age 4 of 6 seven segment translation table using drivers for brighter d isplays a b c d e f g right display g f e d c b a com vcc ( parallel input vcc common anode vcc uln2804 1 2 3 4 5 6 7 8 10 11 12 13 14 15 16 9 18 17 in1 in2 in3 in4 in5 in6 in7 in8 com out8 out7 out6 out5 out4 out3 gnd out1 out2 vcc HEX7 15 9 16 17 18 19 3 6 7 8 10 11 13 14 22 12 20 23 28 21 4 1 2 5 24 25 26 27 serra nc segrc segre segrg nc r8 seglf segld seglb pol segrf segrb vss segle segrd segla seglg vdd seglc r2 l8 l2 nc r1 r4 l1 l4 a b c d e f g left display g f e d c b a com vcc uln2804 1 2 3 4 5 6 7 8 10 11 12 13 14 15 16 9 18 17 in1 in2 in3 in4 in5 in6 in7 in8 com out8 out7 out6 out5 out4 out3 gnd out1 out2 common anode absolute maximum ratings symbol description min typical max units notes t stg storage t emperature - 55 25 + 100 oc t a operating temperature - 40 +85 oc v dd v dd - v ss voltage - 0 .5 +6.0 v v io input voltage v ss - 0 .5 v dd + 0 .5 v i mio maximum current into any pin - 25 +50 ma esd electrostatic discharge voltage 2000 v human bo dy model esd lu latch up current 200 ma
turning ideas into reality abcircuits www.abcircuits.com pob 123 new hill nc 27562 (919) 290 - 7104 part number HEX7 copyright ? 2014 abcircuits. revised september 2014 p age 5 of 6 dc electrical characteristics symbol description min typical max units notes v dd s upply voltage 2.4 5.25 v i dd supply current 5 8 ma note 1 v oh high output level v dd - 1.0 v note 2 v ol low outp ut voltage 0.75 v note 3 v ih input high level 2.1 v v il input low level 0.8 v i oh high level source current 10 ma note 2 i ol low level sink current 25 ma note 3 c io capacitive load 3.5 10 pf i il input leakage 1 na r pu pull up resist ors on inpu ts 4 5.6 8 k ? note 1: vdd=5vdc, all inputs and outputs open note 2 i oh =10 ma max per pin, 80 ma maximum all pins combined note 3 i ol =25 ma max per pin 150 ma maximum all pins combined theory of operation the HEX7 ic is a custom programmed mic roprocessor designed to monitor a parallel input and convert the received data to seven segment format. the device allows the outputs to be inverted if necessary to simplify driver construction. the ic displays in decimal (0 - 9) or hexadecimal (0 - f) chara cters.
turning ideas into reality abcircuits www.abcircuits.com pob 123 new hill nc 27562 (919) 290 - 7104 part number HEX7 copyright ? 2014 abcircuits. revised september 2014 p age 6 of 6 physical dimensions soic - 28 physical dimensions 28 pin dip package ( - dip suffix) c lose but not quite? our products are software based, we can modify existing parts to fit your needs at a minimal cost or create new parts designed to your speci fications. email us and we can make a chip for you! for the latest version of this spec sheet, visit www.abcircuits.com design services available we can quickly turn your idea into a chip, a pc board, or a finish ed product. contact us with your needs and specifications.
|
