Triple Output IC Controlled RGB LED Driver The NCP63 mixed analog circuit is a triple output LED driver dedicated to the RGB illumination or backlight LCD display. Features.7 to. V Input Voltage Range RGB Function Fully Supported Programmable Integrated Gradual Dimming 90 ma Total LED Current Capability Provides Three Independent LED Drives Support IC Protocol This is a Pb Free Device Typical Applications Multicolor Illuminations Portable Back Light Digital Cellular Phone Camera Photo Flash LCD and Key Board Simultaneous Drive +Vcc MCU IC Port + C F/6.3 V U NCP63 F/6.3 V C 3 D Vdet SDA 9 SDA LED R 6 R 0 IREF LED G 3 6 k 6 LED3 3 B IC NC NC IC 7 8 LRTB G6T Figure. Typical Multiple Color LED Driver + V TSSOP CASE 98G ORDERING INFORMATION MARKING DIAGRAM 63 = Specific Device Code A = Assembly Location L = Wafer Lot Y = Year W = Work Week = Pb Free Package Device Package Shipping NCP63DTBRG TSSOP (Pb Free) 00 / Tape & Reel For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specification Brochure, BRD80/D. 63 ALYW (Note: Microdot may be in either location) Semiconductor Components Industries, LLC, 008 October, 008 Rev. 6 Publication Order Number: NCP63/D
TSSOP IC LED3 LED 3 3 IC Vdet LED 6 0 9 IREF SDA NC 7 8 NC (Top View) Figure. Pin Assignments 7 8 + V C IC NC NC IC F/6.3 V.0 F/6.3 V 3 C NCP63 6 SDA 9 DIGITAL CONTROL PWM LED# LED3 LED 3 D3 D D R 6 k 0 ANALOG FUNCTIONS PWM LED# PWM LED#3 LED CURRENT MIRRORS Figure 3. Simplified Block Diagram
PIN ASSIGNMENT Pin Name Type Description IC This pin is internally connected. It must be left open. POWER This pin is the GROUND signal for the analog and digital blocks and output current control. The pin must be connected to the system ground, a ground plane being strongly recommended. 3 LED3 OUTPUT, POWER LED OUTPUT, POWER LED OUTPUT, POWER 6 ANALOG GROUND This pin sinks to ground and monitors the current flowing into the BLUE LED, intended to be used in illumination application (Note ). The Anode of the associated LED shall be connected to the supply. This pin sinks to ground and monitors the current flowing into the GREEN LED, intended to be used in illumination application (Note ). The Anode of the associated LED shall be connected to the supply. This pin sinks to ground and monitors the current flowing into the RED LED, intended to be used in illumination application (Note ). The anode of the associated LED shall be connected to the supply. This pin copies the Analog Ground and shall be connected to the system ground plane. 7, 8 NC This pin must be left floating with no connection. 9 SDA INPUT, DIGITAL This pin carries the data provided by the IC protocol. The content of the SDA byte is used to program the mode of operation and to set up the output current. 0 I REF ANALOG This pin provides the reference current, based on the internal band gap voltage reference, to control the output current flowing in the LED. A % tolerance, or better, resistor shall be used to get the highest accuracy of the LED current. An external current mirror can be used to bias this pin to dynamically set up the LED maximum current. In no case shall the voltage at I REF pin be forced either higher or lower than the 600 mv provided by the internal reference. INPUT, DIGITAL This pin carries the IC clock to control the IC communication. The clock is associated with the SDA signal. Vdet INPUT This pin provides a DC bias to the internal circuit and must be connected to the same voltage that the one applied to the pin 3. 3 POWER This pin is the input Battery voltage to supply the analog and digital blocks. The pin must be decoupled to ground by a F or higher ceramic capacitor (Note ). IC This pin is internally connected. It must be left open.. The maximum current is 37 ma for each LED. Using low ESR ceramic capacitor, XR type, is recommended. 3
MAXIMUM RATINGS Symbol Rating Value Unit V bat Power Supply (see Figure ) 0.3 < V bat < 7.0 V SDA, Digital Input Voltage 0.3 < V < V bat V ESD Human Body Model: R = 00, C = 00 pf (Note 3) Machine Model P D R JC R JA Power Dissipation @ T A = +8 C (Note ) Thermal Resistance Junction to Case Thermal Resistance Junction to Air T A Operating Ambient Temperature Range 0 to +8 C T J Operating Junction Temperature Range 0 to + C T Jmax Maximum Junction Temperature +0 C T stg Storage Temperature Range 6 to +0 C I LATCHUP Latch up current maximum rating per JEDEC standard: JESD78. ±00 ma Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. Moisture Sensitivity Level (MSL): per IPC/JEDEC standard: J STD 00A. 3. This device series contains ESD protection and exceeds the following tests: Human Body Model (HBM) ±.0 kv per JEDEC standard: JESD A Machine Model (MM) ±00 V per JEDEC standard: JESD A. The maximum package power dissipation limit must not be exceeded. 00 3 6 70 kv V mw C/W C/W POWER SUPPLY SECTION: (Typical values are referenced to T A = + C, Min & Max values are referenced 0 C to +8 C ambient temperature, unless otherwise noted), operating conditions.8 V < V bat <. V, unless otherwise noted. Pin Symbol Rating Min Typ Max Unit 3 V bat Power Supply.7. V 3 I stdb Stand By Current 3.0 V V bat. V, I LED = 0 ma 0.8.0 A 3 I op Operating Current, @I LED = 0 ma, 3.0 V V bat. V 3,, I TOL RGB Output Current Tolerance @V bat = 3.6 V, I LED = 0 ma C < T A < 8 C 3,, I MATCH RGB Output Current LED Matching @V bat = 3.6 V, I LED =.0 ma 30 A ±3 % ±0. % Fpwr Internal Clock Operating Frequency 0 C < T A < 8 C 0.8. MHz
ANALOG SECTION: (Typical values are referenced to T A = + C, Min & Max values are referenced 0 C to +8 C ambient temperature, unless otherwise noted), operating conditions.8 V < V bat <. V, unless otherwise noted. Pin Symbol Rating Min Typ Max Unit 0 I REF Reference current @V REF = 600 mv (Note, Note 8) 3. 0 A 0 V REF Reference Voltage (Note ) 3% 600 +3% mv I LEDR Reference Current (I REF ) current ratio 00 0 Rbias External Reference current Bias resistor (Note 6) 30 8 00 k 3,, F PWM Internal PWM Frequency (Note 7). khz. The external circuit must not force the I REF pin voltage either higher or lower than the 600 mv specified. The system is optimized with a. A reference current. 6. The overall output current tolerance depends upon the accuracy of the external resistor. Using % or better resistor is recommended. 7. This parameter, derived from the MHz clock, is guaranteed by design, not tested in production. DIGITAL PARAMETERS SECTION: (Typical values are referenced to T A = + C, Min & Max values are referenced 0 C to +8 C ambient temperature, unless otherwise noted), operating conditions.8 V < V bat <. V, unless otherwise noted. Pin Symbol Rating Min Typ Max Unit F Input IC clock frequency 00 khz 9, V IH Positive going Input High Voltage Threshold, SDA, signals (Note 8) 9, V IL Negative going Input Low Voltage Threshold, SDA, signals (Note 8) NOTE: Digital inputs undershoot 0.30 V to ground, Digital inputs overshoot < 0.30 V to V bat 8. Test guaranteed by design and fully characterized, not implemented in production.. V Chip functionnal, but no parameter guaranteed when is between. V & 7.0 V 7.0 V Absolute Maximum Rating.6 V bat V 0 0. V The chip might be damaged or destroyed when is above 7.0 V Maximum Voltage Operation. V 3.0 V.7 V.0 V NORMAL Li IonOPERATION Power On Reset No operation during POR Reserved for internal Reset Note: the internal POR sequence is 80 s maximum long Figure. Understanding Integrated Circuit Voltage Limitations
LED MAXIMUM CURRENT CALCULATION The load current is derived from the 600 mv reference voltage provided by the internal Band Gap associated to the external resistor connected across I REF pin and Ground. Note : due to the internal structure of this pin, no voltage, either downward or upward, shall be forced at the I REF pin. The reference current is multiplied by the constant k = 00 to yield the output load current. Since the reference voltage is based on a temperature compensated Band Gap, a tight tolerance resistor will provide a very accurate load current. The resistor is calculated from the Ohm s law (R bias = V REF /I REF ) and a more practical equation can be arranged to define the resistor value for a given maximum output current ILEDmax: R bias = (V REF *k)/iledmax [ ] R bias = (0.6*00)/ILEDmax R bias = 0/ILEDmax [ ] Since the I REF to ILEDmax ratio is very high, it is strongly recommended to set up the reference current at. A to optimize the tolerance of the output current. Although it is possible to use higher or lower value, as defined in the analog section, a 8 k / % resistor will provide the best compromise, the dimming being performed by the appropriate PWM registers. On the other hand, care must be observed to avoid leakage current flowing into either the I REF pin of the bias resistor network. Finally, for any desired ILED current, the curve provided Figure can be recalculated according to the equation: ILED I REF k (eq. ) 3 n ILED V REF 00 R bias 3 n (eq. ) with: n = step value @ n 3 with: R bias = reference resistance with: k = internal multiplier constant = 00 Note: n=0 ILED is set to zero n = 3 ILED is set to the same current as n = 30 LOAD CONNECTION The primary function of the NCP63 is to control three LED arranged in the RGB color structure (reference OSRAM LATB G66x). The brightness of each LED is independently controlled by a set of dedicated PWM structure embedded into the silicon chip. The maximum current, identical for each LED, is programmable by means of the IC data byte. With 3 steps per PWM, the chip provides 3768 colors hue in a standard display. Moreover, a built in gradual dimming provides a smooth brightness transition for any current level, in both Upward and Downward direction. The dimming function is controlled by the IC interface: see Table. The NCP63 chip is capable to drive the three LED simultaneously, as depicted in Figure, but the load can be arranged to accommodate several LED if necessary in the application. Finally, the three current mirrors can be connected in parallel to drive a single powerful LED, thus yielding 90 ma current capability in a single LED. IC PROTOCOL The NCP63 is programmed by means of the standard IC protocol controlled by an external MCU. The communication takes place with two serial bytes sharing the same IC frame: Byte# physical IC address Byte# Selected internal registers & function B7 B6 B B B3 B B B0 Byte# : IC Physical Address, based 7 bits : % 0 000 $38 * 0 0 0 0 R/W Byte# : DATA register RLED RLED RLED0 BLED BLED3 BLED BLED BLED0 *Note: according to the IC specifications, the physical address is based on 7 bits out of the SDA byte, the 8 th bit representing the R/W command. Since the NCP63 is a receiver only, the R/W command is 0 and the hexadecimal byte send by the MCU is %0 0000 = $70 6
B[7:] : Internal Register Selection: B7 B6 B Function 0 0 0 Chip Shut Down all LED current = zero 0 0 Set up the maximum Output LED Current 0 0 PWM : Red LED control 0 PWM : Green LED control 0 0 PWM3 : Blue LED control 0 Set the Upward Iend target 0 Set the Downward Iend target Gradual Dimming Step Time and Run The contain of bits B[:0] depends upon the type of function selected by bits B[7:] as depicted in Table Table. Internal Register Bits Assigment B7 B6 B B B3 B B B0 Comments 0 0 0 X X X X X Shut down 0 0 6 8 LED Current Step, see Figure (Note 9) 0 0 BPWM6 BPWM8 BPWM BPWM BPWM Red PWM 0 BPWM6 BPWM8 BPWM BPWM BPWM Green PWM 0 0 BPWM6 BPWM8 BPWM BPWM BPWM Blue PWM 0 GDIM 6 GDIM 8 GDIM3 GDIM GDIM Set Gradual Dimming Upward Iend Target (Note 0) 0 GDIM 6 GDIM 8 GDIM3 GDIM GDIM Set Gradual Dimming Downward Iend Target (Note 0) GDIM 8 ms GDIM 6 ms GDIM3 3 ms GDIM 6 ms GDIM 8 ms Gradual Dimming Time & run 9. The programmed current applies to the three LED simultaneously, the gradual dimming is not engaged 0.The bit values represent the steps count, not the ILED current: see equations &, page 6, to derive the ILED value. GRADUAL DIMMING The purpose of that function is to gradually Increase or Decrease the brightness of the backlight LED upon command from the external MCU. The function is activated and controlled by means of the IC protocol. In order to avoid arithmetic division functions at silicon level, the period (either upward or downward) is equal to the time defined for each step, multiplied by the number of steps. To operate such a function, the MCU will provide two information: The target current level (either upward or downward) The time per step and run When a new gradual dimming sequence is requested, the output current increases, according to an exponential curve, from the existing start value to the end value. The end current value is defined by the contain of the Upward or Downward registers, the width of each step is defined by the Time and run register, the number of step being in the to 3 range. In the event of software error, the system checks that neither the maximum output current (30 ma), nor the zero level are forced out of their respective bounds. Similarly, software errors shall not force the NCP63 into an uncontrolled mode of operation. The dimming is built with 30 steps and the time delay encoded into the second byte of the IC transaction: see Table. When the gradual dimming is deactivated (B7 = B6 = 0, B = ), the output current is straightforwardly set up to the level defined by the contain of the related register upon acknowledge of the output current byte. The gradual dimming sequence must be set up before a new output current data byte is send to the NCP63. At this point, the brightness sequence takes place when the new data byte is acknowledged by the internal IC decoder. Since the six registers are loaded on independent byte flow associated to the IC address, any parameter of the NCP63 chip can be updated ahead of the next function as depicted in Table. 7
Table. Basic Programming Sequences IC Address COMMAND Bits[7:0] Operation Note $70 000X XXXX System Shut Down Bits[:0] are irrelevant $70 000 0000 00 $70 000 0000 00 $70 00 0000 0 $70 000 0000 00 $70 00 0000 0 $70 00 0000 0 $70 0 000 Set Up the ILED current Set Up the RED PWM Set Up the GREEN PWM Set Up the BLUE PWM Set Up the IEND Upward Set Up the IEND Downward Set Up the Gradual Dimming time and run the sequence ILED register Bits[:0] contain the ILED value as defined by the I REF value REDPWM Bits[:0] contain the PWM value GREENPWM Bits[:0] contain the PWM value BLUEPWM Bits[:0] contain the PWM value UPWARD Bits[:0] contain the IEND value DWNWRD Bits[:0] contain the IEND value GRAD Bits[:0] contain the TIME value The number of step for a given sequence, depends upon the start and end output current range: since the ILED value is encoded in the Bits[:0] binary scale, a maximum of 3 steps is achievable during a gradual dimming operation. The number of steps will be automatically recalculated by the chip according to the equation: Nstep = existing step position new step position As an example, assuming the previously programmed step was and the new one is, then we will have 0 steps to run between the actual location to the end value. If the timing was set at 6 ms, the total gradual dimming sequence will be 60 ms. To select the direction of the gradual dimming (either Upward or Downward), one shall send the appropriate register before to activate the sequence as depicted below: 00 0 00 select an UPWARD sequence with ms/step, the end ILED current being (I REF *00)/(3 ) 00 000 0 000 select the DOWNWARD sequence with 3 ms/step, the end ILED current being (I REF *00)/(3 ). Table 3. Output Current Programmed Value (ILED = F(Step)) Step ILED (ma) Step ILED (ma) Step ILED (ma) Step ILED (ma) 0 / $00 0 9 / $09. 8 / $. 7 $B 6.90 / $0 0.9 0 / $0A.3 9 / $3.30 8 / $C 9.0 / $0 0.9 / $0B.38 0 / $.0 9 / $D 3.80 3 / $03 0.98 / $0C. / $.76 30 / $E 7.60 / $0.0 3 / $0D.3 / $6 3.06 3 / $F 7.60 / $0.06 / $0E.6 3 / $7 3. 6 / $06.0 / $0F.7 / $8 3.9 7 / $07. 6 / $0.8 / $9.60 8 / $08.0 7 / $.97 6 / $A. NOTE: The table assumes I REF =. A 8
30 0 I LED (ma) 0 0 0 0 Step Figure. Output Current Programmed Value ( ILED = F(Step) ) 0 30 3 PWM OPERATION The built in PWM are fully independent and can be programmed to any value during the normal operation of the NCP63 chip. The PWM operate with five bits, yielding a 3 steps range to cover the full modulation (0 to 00%) of the associated LED: PWM = $00 the associated LED is fully OFF, whatever be the programmed ILED value PWM > $00 but < $F the brightness of the associated LED is set depending upon the PWM modulation value PWM = $F the associated LED is fully ON, the current being the one defined by the ILED value. Each PWM is programmable, via the IC port as depicted, at any time under any sequence arrangement as requested by the end system s designer. The PWM does not change the ILED value, but merely modulate the ON/OFF ratio of the associated LED. Each step of the PWM represent 00/3 = 3.% of the full range, the clock being. khz (typical). +Vcc MCU IC Port F/6.3 V C SDA + 3 9 R 0 6 k 6 Vdet SDA IREF U NCP63 LED LED LED3 3 IC NC NC IC 7 8 C F/6.3 V D 6 R G B 3 LRTB G6T + V Figure 6. Basic RGB Application 9
PACKAGE DIMENSIONS 0. (0.006) T 0. (0.006) T L 0.0 (0.00) T SEATING PLANE U U S X L/ PIN IDENT. S D C G X K REF A V 0.0 (0.00) M T U S V S 8 7 B U H TSSOP CASE 98G 0 ISSUE B N N J J F DETAIL E DETAIL E 0. (0.00) K K M ÇÇÇ ÉÉÉ ÇÇÇ ÉÉÉ SECTION N N W NOTES:. DIMENSIONING AND TOLERANCING PER ANSI Y.M, 98.. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSION A DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH OR GATE BURRS SHALL NOT EXCEED 0. (0.006) PER SIDE.. DIMENSION B DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSION. INTERLEAD FLASH OR PROTRUSION SHALL NOT EXCEED 0. (0.00) PER SIDE.. DIMENSION K DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.08 (0.003) TOTAL IN EXCESS OF THE K DIMENSION AT MAXIMUM MATERIAL CONDITION. 6. TERMINAL NUMBERS ARE SHOWN FOR REFERENCE ONLY. 7. DIMENSION A AND B ARE TO BE DETERMINED AT DATUM PLANE W. MILLIMETERS INCHES DIM MIN MAX MIN MAX A.90.0 0.93 0.00 B.30.0 0.69 0.77 C.0 0.07 D 0.0 0. 0.00 0.006 F 0.0 0.7 0.00 0.030 G 0.6 BSC 0.06 BSC H 0.0 0.60 0.00 0.0 J 0.09 0.0 0.00 0.008 J 0.09 0.6 0.00 0.006 K 0.9 0.30 0.007 0.0 K 0.9 0. 0.007 0.00 L 6.0 BSC 0. BSC M 0 8 0 8 SOLDERING FOOTPRINT 7.06 0.6 PITCH X 0.36 X.6 DIMENSIONS: MILLIMETERS *For additional information on our Pb Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. Typical parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including Typicals must be validated for each customer application by customer s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. PUBLICATION ORDERING INFORMATION LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor P.O. Box 63, Denver, Colorado 807 USA Phone: 303 67 7 or 800 3 3860 Toll Free USA/Canada Fax: 303 67 76 or 800 3 3867 Toll Free USA/Canada Email: orderlit@onsemi.com N. American Technical Support: 800 8 98 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 33 790 90 Japan Customer Focus Center Phone: 8 3 773 380 0 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative NCP63/D