[AK7864] AK7864 3 channel LED driver with Charge Pump Device Outline This product is include the charge 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 resistance and the register setting. Also, it has the control pins which turn on or off the current. It is the best for the LED drive for the CIS sensor. Features ■ Operation Voltage ■ Operating Temperature Range ■ LED driver current 3.3V±5% 0 ~ 70℃ RED: 66mA (Adjustment external 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 resistance value becomes the assumption outside, it has the protection circuit which ■ ■ ■ ■ Current Accuracy LED Current rise / fall time Charge Pump pressor circuit Package ■ Power ■ Application MS1152 - E - 01 doesn't make the electric current which flows through the LED equal to or more than 150mA（-30%～+45%） ±9.1%（by ideal resistance） 10μs (typ.) (10% ~ 90%) Generate the necessary voltage for the LED （Vf max 4.8V） 16pinQFN 3mm, 0.75mm thickness with radiation TAB in Solderside VDD 3.135 ~ 3.465V A light source driver for CIS module of MFP 1 2010/09 [AK7864] Block Diagram CPO CP1 VDD CPOUT (3.3V±5%) LED_R LED_G LED_B CONT_B SW CONT_G SW CONT_R SW EN CP CP(x2) Current CC 3bit CN 8steps Current R PDN Current G Current B IREF VSS R 1% accuracy Circuit Block Description □ Charge Pump Circuit A necessary voltage for LED (Vf 4.8V or less) lighting is generated from the voltage supplied to VDD pin. Please supply the generated 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 control 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 simultaneously. Please set the current less than 50% by 3ch simultaneously. - Current setting of 3 channels is same. 3ch 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、．．． MS1152 - E - 01 2 2010/09 [AK7864] Current setting method The method of setting the LED 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. The level is set here EN Turn RGB on Not turn on CONT_R CONT_G CONT_B After fall, LED is on with EN high period. 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 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% MS1152 - E - 01 Current setting 3 2010/09 [AK7864] Pin Allocation VSS 9 LED_G 10 VSS 11 LED_R 12 CPOUT 13 VSS 14 AK7864 Top View CP 15 CN 16 4 LED_B 7 CONT_R 6 CONT_G 5 CONT_B 4 EN 3 PDN 2 IREF 1 VDD MS1152 - E - 01 8 2010/09 [AK7864] Pin Functions No. 1 2 Name VDD IREF 3 PDN I 4 EN I 5 I I LED control input G I LED control input R 8 9 10 11 12 13 CONT_ B CONT_ G CONT_ R LED_B VSS LED_G VSS LED_R CPOUT power supply LED current setting external resister pin （Use the external resistance Pull Down by power down） Power down mode terminal Hi: power up, Lo: power down LED current enable terminal Hi:enable, Lo:disable LED control input B O P O P O O 14 15 VSS CP P I 16 CN I LED output pin B （Hi-z@PD） GND LED output pin G （Hi-z@PD） GND LED output pin R （Hi-z@PD） Charge pump power supply out put pin （Use the internal resistance Pull Down by power down） GND Charge pump connect with cap positive terminal （Use the internal resistance Pull Down by power down） Charge pump connect with cap negative terminal （Use the internal resistance Pull Down by power down.） Connect it with GND. 6 7 radiation pad MS1152 - E - 01 IO P O Description 5 2010/09 [AK7864] Absolute Maximum Ratings Voltages are referenced to corresponding ground level. VSS=0V Item Symbol Min. Max. Unit Power supply VDD −0.3 4.0 V Input Voltage VINA −0.3 VDD+0.3 V Remarks Storage temperature Tstg −65 150 °C Operation under a condition exceeding above limits may cause permanent 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 Power supply Symbol VDD Min. 3.135 Ta 0 Storage temperature Typ. 3.3 Max. 3.465 Unit V 70 °C Remarks When powered-up, Please set PDN to Lo, then set PDN to Hi. Release from reset + PD. Electrical Characteristics 1. Digital input DC characteristics Item H level input voltage L level input voltage Input leakage current Symbol VIH VIL IL (VDD=3.135~3.465V, Ta=0∼70°C unless otherwise specified) Pin Min. Typ. Max. Unit. Remarks Note 0.7× V 1 VDD Note 0.3× V 1 VDD Note -2 2 μA 1 （Note 1） PDN, EN, CONT_R,G,B 2. CP block, Analog characteristics Item CPOUT Voltage CPOUT Rise time CPOUT Fall time Current Consumption MS1152 - E - 01 (VDD=3.135~3.465V, Ta=0∼70°C unless otherwise specified) Min. Typ. Max. Unit Remarks 6.27 6.6 6.93 V @LED current disable 1 msec 20 msec 4.0 mA 6 2010/09 [AK7864] 3. LEDD block, Analog characteristics Item LED drive current range The LED protection circuit activation current LED current (R/G/B) LED current accuracy (R/G/B) LED current LED pin voltage dependence LED Vf Current Consumption Min. 22 105 60 86.0 73.5 60.5 48 35.5 23 10.5 -2.5 (VDD=3.135~3.465V ,Ta=0∼70°C unless otherwise specified) Typ. Max. Unit Remarks （note 1） 66 mA 150 217.5 mA 66 100 87.5 75 62.5 50 37.5 25 12.5 1.1 72 mA 89.0 76.5 64.5 52 39.5 27 14.5 2.5 % % % % % % % % % 4.8 1.1 V mA IREF resister =4.7 kΩ±1% LED pin voltage =(2*VDD – 3.1)V LED pin voltage =(2*VDD – 3.1)V 000 001 010 011 100 101 110 111 LED pin voltage =(2*VDD – 3.1)V reference (note 2) Except LED drive current （note 1） IREF resistance value(kΩ) ＝ 66 ÷ [LED set value (mA)] × 4.7(kΩ) , also [LED set value] is possible to set with 22mA ~ 66mA. (note 2) Set a lower limit value 1.1V to be only 1ch in 3ch, and use the other 2ch by 2.0V or more with LED_Vf. (note 3) External load: The total line resistance value of CPOUT pin ~ LED anode and LED cathode ~ LED_X pin within 2Ω. (note 4) 50% setting is an upper bound when 3ch becoming turning on at the same time. MS1152 - E - 01 7 2010/09 [AK7864] 4. LEDD block, Switching characteristics EN 0.7VDD 0.3VDD ts CONTR/G/B th 0.7VDD 0.7VDD (high setting) tcl th CONTR/G/B (low setting) tcl 0.3VDD tlon 90% LED current 10% tloff No. tlon tloff ts th tcl Item LED current rise time LED current fall time Reset valid setup time LEDB_EN(0.7AVDD):base position Count up setup time LEDB_EN(0.3AVDD):base position Current set clearing CONT_x:0.7VDD: base position MS1152 - E - 01 min. 1 (VDD=3.135~3.465V ,Ta=0∼70°C, unless otherwise specified) typ. max. Unit Conditions 10 μsec 10 μsec μsec CONTR/G/B to EN(0.7VDD) 1 μsec 1 μsec 8 EN(0.3VDD) to CONTR/G/B 2010/09 [AK7864] 5. PDN Switching characteristics Tpd 1 3.135V Power Tstup Tpd2 PDN E (VDD=3.135~3.465V ,Ta=0∼70°C, unless otherwise specified) Item Power down period 1 Power down period 2 Start up time Symbol Pin Tpd1 PDN Tpd2 PDN Tstup EN Min. 150 150 Typ. Max. 1 Unit ns ns ms Conditions ( note 1) Please make PDN and EN Lo when you turn on the power supply. ( note 2) LED's lighting after max.1msec after standing up of PDN. 6. Power Down Characteristic Item Power Down Current MS1152 - E - 01 (VDD=3.135~3.465V ,Ta=0∼70°C, unless otherwise specified) Min. Typ. Max. Unit. Remarks 20 µA 9 2010/09 [AK7864] External circuit example 1µF CONT_R 7 CONT_G 6 CONT_B 5 4 EN PDN 3 IREF 2 MS1152 - E - 01 VDD 1 10µF LED_B 8 AK7864 Top View 15 CP 16 CN 9 V SS 14 VSS 10 LED_ G 1µF 11 VSS 12 LED_R 13 CPOUT 4.7kΩ 10 2010/09 [AK7864] Package 1 Package dimension unit [mm] 3.00±0.07 B 1.80 1.50 9 8 13 5 16 1.50 1.80 3.00±0.07 A 12 0.30±0.07 4 1 0.22±0.05 C0.30 0.05 M S A B 0.50 0.05 S 0.12～ 0.18 A部 0.00～ 0.05 0.70 0.05MAX 0.75MAX S 0.17～ 0.27 【 A部詳細図】 2 Marking １．Marketing code ：7864 ２．Date code ：XXXXX 7864 XXXXX MS1152 - E - 01 11 2010/09 [AK7864] IMPORTANT NOTICE z These products and their specifications 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 patent, intellectual property, or other rights in the application or use of any information contained herein. z Any export of these products, or devices or systems containing 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 exchange, or strategic materials. z AKM products are neither intended nor authorized for use as critical componentsNote1) in any safety, life support, or other hazard related device or systemNote2), and AKM assumes no responsibility for such use, except for the use approved with the express written consent by Representative Director of AKM. As used here: Note1) A critical component is one whose failure to function or perform may reasonably be expected to result, whether directly or indirectly, in the loss of the safety or effectiveness of the device or system containing 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, nuclear energy, or other fields, in which its failure to function or perform 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 products, 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. MS1152 - E - 01 12 2010/09