View AK7864_4734954.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

[AK7864] ms1152 - e - 01 1 2010/09 AK7864 3 channel led driver with charge pump device outline this product is include the c harge pump power supply and include the 3 channel led driver who drives the led of the anode common in the constant current . the current to pass for each channel can be adjusted by the external resi stance and the register setting. also , it has the control pins which turn on or off the current. it is the bes t for the led drive for the cis sensor. features operation voltage 3.3v5% operating temperature range 0 ~ 70 led driver current red: 66ma (adjustment exte rnal resister:22 ~ 66ma) green: 66ma (same as above, each channel is spec in absolute value.) blue: 66ma (same as above, each channel is spec in absolute value.) usable vf max range of the led is 4.8v. the resistance for the current regulation is usable in 1/16w -type. ? 50% setting is an upper bound when 3ch becoming turning on at the same time. ? 3ch independent on/off. ? current setting in eight steps when the external resist ance value becomes the assumption outside, it has t he protection circuit which doesn't make the electric cu rrent which flows through the led equal to or more than 150ma -30% +45% current accuracy 9.1% by ideal resistance led current rise / fall time 10 s (typ.) (10% ~ 90%) charge pump pressor circuit generate the necessary voltage for the led vf max 4.8v package 16pinqfn 3mm, 0.75mm thickness with radiation tab in solderside power vdd 3.135 ~ 3.465v application a light source driver for cis module of mfp
[AK7864] ms1152 - e - 01 2 2010/09 block diagram circuit block description charge pump circuit a necessary voltage for led (vf 4.8v or less) li ghting is generated from t he voltage supplied to vdd pin. please supply the generat ed power supply from cpout pin to external led. led driver part this product generates has 3 channel led driver to drive rgb constant current. use the on/ off digital terminal to contro l the constant current. the current setting can be set to 8 level with cont_r/g/b and en combination. it is possible to light 1ch led or 3ch simultaneous ly. please set the current less than 50% by 3ch simultaneously. - current setting of 3 channels is same. 3c h on/off independent or at the same time. - current setting can be set to 8 level with cont_r/g/b and en combination. (100%/87.5%/75% /62.5%/50%/37. 5%/25%/12.5%) - when 100%=60ma, 87.5%=52.5ma 75%=45ma - when 100%=66ma, 87.5%=57.75ma 75%=49.5ma cont_b cont_g cont_r vss cpout led_r led_g led_b iref vdd (3.3v5%) cp(x2) cpo en pdn current r current g current b cp1 current 3bit 8steps sw sw sw r 1% accuracy cp cn cc
[AK7864] ms1152 - e - 01 3 2010/09 current setting method the method of setting the le d current is as follows. latch the pattern of cont_r, cont_g, cont_b at the time of following en rise to decide the current value.after the cont_r, cont_g, cont_b signal fall once, the current interlocks with cont_r, cont_g, cont_b?s on or off. en cont_r cont_g cont_b the relation between the pattern and the current setting value of cont_r, cont_g, cont_b at the time of the en rise as follows. cont_r cont_g cont_b current setting 0 0 0 100% 0 0 1 87.5% 0 1 0 75% 0 1 1 62.5% 1 0 0 50% 1 0 1 37.5% 1 1 0 25% 1 1 1 12.5% after fall, led is on with en high period. the level is set here turn rgb on not turn on
[AK7864] ms1152 - e - 01 4 2010/09 pin allocation 13 14 15 16 8 7 6 5 4 3 2 1 cp cn led_b cont_ r cont_g 9 10 11 12 vss iref vdd en pdn AK7864 led_r cpout vss vss led_g cont_b top view
[AK7864] ms1152 - e - 01 5 2010/09 pin functions no. name io description 1 vdd p power supply 2 iref o led current setting external resister pin use the external resistance pull down by power down 3 pdn i power down mode terminal hi: power up, lo: power down 4 en i led current enable terminal hi:enable, lo:disable 5 cont_ b i led control input b 6 cont_ g i led control input g 7 cont_ r i led control input r 8 led_b o led output pin b hi-z@pd 9 vss p gnd 10 led_g o led output pin g hi-z@pd 11 vss p gnd 12 led_r o led output pin r hi-z@pd 13 cpout o charge pump power supply out put pin use the internal resistance pull down by power down 14 vss p gnd 15 cp i charge pump connect wi th cap positive terminal use the internal resistance pull down by power down 16 cn i charge pump connect with cap negative terminal use the internal resistance pull down by power down. radiation pad connect it with gnd.
[AK7864] ms1152 - e - 01 6 2010/09 absolute maximum ratings voltages are referenced to corresponding ground level. vss=0v item symbol min. max. unit remarks power supply vdd ? 0.3 4.0 v input voltage vina ? 0.3 vdd+0.3 v storage temperature tstg ? 65 150 c operation under a condition exc eeding above limits may cause per manent damage to the device. normal operation is not guaranteed under the above extreme conditions. recommended operating conditions voltages are referenced to corresponding ground level. vss=0v item symbol min. typ. max. unit remarks power supply vdd 3.135 3.3 3.465 v storage temperature ta 0 70 c when powered-up, please set pdn to lo, then se t pdn to hi. release from reset + pd. electrical characteristics 1. digital input dc characteristics (vdd=3.135~3.465v, ta=0 70 c unless otherwise specified) item symbol pin min. typ. max. unit. remarks h level input voltage vih note 1 0.7 vdd v l level input voltage vil note 1 0.3 vdd v input leakage current il note 1 -2 2 a note 1 pdn, en, cont_r,g,b 2. cp block, analog characteristics (vdd=3.135~3.465v, ta=0 70 c unless otherwise specified) item min. typ. max. unit remarks cpout voltage 6.27 6.6 6.93 v @led current disable cpout rise time 1 msec cpout fall time 20 msec current consumption 4.0 ma
[AK7864] ms1152 - e - 01 7 2010/09 3. ledd block, analog characteristics (vdd=3.135~3.465v ,ta=0 70 c unless otherwise specified) item min. typ. max. unit remarks led drive current range 22 66 ma note 1 the led protection circuit activation current 105 150 217.5 ma led current (r/g/b) 60 66 72 ma iref resister =4.7 k 1% led pin voltage = (2*vdd C 3.1)v led current accuracy (r/g/b) 86.0 73.5 60.5 48 35.5 23 10.5 100 87.5 75 62.5 50 37.5 25 12.5 89.0 76.5 64.5 52 39.5 27 14.5 % % % % % % % % led pin voltage = (2*vdd C 3.1)v 000 001 010 011 100 101 110 111 led current led pin voltage dependence -2.5 2.5 % led pin voltage = (2*vdd C 3.1)v reference led vf 1.1 4.8 v (note 2) current consumption 1.1 ma except led drive current note 1 iref resistance value(k ? ) 66 [led set value (ma)] 4.7(k ? ) , also [led set value] is possible to set with 22ma ~ 66ma. (note 2) set a lower limit value 1.1v to be only 1c h in 3ch, and use the other 2ch by 2.0v or more with led_vf. (note 3) external load: the total line re sistance value of cpou t pin ~ led anode and led cathode ~ led_x pin within 2 . (note 4) 50% setting is an upper bound when 3c h becoming turning on at the same time.
[AK7864] ms1152 - e - 01 8 2010/09 4. ledd block, switching characteristics en contr/g/b (high setting) contr/g/b (low setting) led current (vdd=3.135~3.465v ,ta=0 70 c, unless otherwise specified) no. item min. typ. max. unit conditions tlon led current rise time 10 sec tloff led current fall time 10 sec ts reset valid setup time ledb_en(0.7avdd):base position 1 sec contr/g/b to en(0.7vdd) th count up setup time ledb_en(0.3avdd):base position 1 sec en(0.3vdd) to contr/g/b tcl current set clearing cont_x:0.7vdd: base position 1 sec ts th 0.7vdd 0.7vdd 0.3vdd 0.7vdd 90% tloff 10% th tcl 0.3vdd tlon tcl
[AK7864] ms1152 - e - 01 9 2010/09 5. pdn switching characteristics (vdd=3.135~3.465v ,ta=0 70 c, unless otherwise specified) ( note 1) please make pdn and en lo when you turn on the power supply. ( note 2) led's lighting after ma x.1msec after standing up of pdn. 6. power down characteristic (vdd=3.135~3.465v ,ta=0 70 c, unless otherwise specified) item min. typ. max. unit. remarks power down current 20 a item symbol pin min. typ. max. unit conditions power down period 1 tpd1 pdn 150 ns power down period 2 tpd2 pdn 150 ns start up time tstup en 1 ms pdn t pd 2 power t pd 1 3.135 v e tstup
[AK7864] ms1152 - e - 01 10 2010/09 external circuit example cp cn led_b con t_r cont_g vss ir ef vdd en pdn AK7864 led_r cpout vss vss led_ g cont_b top view 13 14 15 16 1 2 3 4 5 6 7 8 9 10 11 12 1 f 1 f 10 f 4.7k ?
[AK7864] ms1152 - e - 01 11 2010/09 package 1 package dimension unit [mm] 2 marking marketing code 7864 date code xxxxx 7 864 x xx x x 3.000.07 3.000.07 a 9 13 16 1 5 8 12 c0.30 1.50 1.80 1.80 1.50 s 0.50 0.05max 4 b 0.300.07 0.220.05 0.05 s a b m 0.70 s 0.05 0.00 0.05 0.17 0.27 0.12 0.18 a? a 0.75max
[AK7864] ms1152 - e - 01 12 2010/09 important notice z these products and their s pecifications are subject to change without notice. when you consider any use or application of these products, please make inquiries the sales office of asahi kasei microdevices corporation (akm) or authorized distributors as to current status of the products. z akm assumes no liability for infringement of any pat ent, intellectual property, or other rights in the application or use of any in formation contained herein. z any export of these products, or devices or systems contai ning them, may require an export license or other official approval under the law and regulations of the country of export pertaining to customs and tariffs, currency ex change, or strategic materials. z akm products are neither intended nor aut horized for use as critical components note1) in any safety, life support, or other haz ard related device or system note2) , and akm assumes no responsibility for such use, exc ept for the use approved with t he express written consent by representative director of akm. as used here: note1) a critical component is one whose failu re to function or perform may reasonably be expected to result, whether directly or indirectly , in the loss of the safe ty or effectiveness of the device or system containi ng it, and which must therefore meet very high standards of performance and reliability. note2) a hazard related device or system is one designed or intended for life support or maintenance of safety or for applications in medicine, aerospace, nuc lear energy, or other fields, in which its failure to function or per form may reasonably be expected to result in loss of life or in significant injury or damage to person or property. z it is the responsibility of the buyer or distributor of akm produc ts, who distributes, disposes of, or otherwise places the product with a third party, to notify such third party in advance of the above content and conditions, and the buyer or distributor agrees to assume any and all responsibility and liability for and hold akm harmless from any and all claims arising from the use of said product in the absence of such notification.

▲Up To Search▲

Price & Availability of AK7864

	To Download AK7864 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .