CAT3626HV4-T2

CAT3626 LED Driver, Charge Pump, 6-Channel, I2Ct Interface Description RGB LEDs LCD and Keypad Backlighting Cellular Phones, PDAs Digital Cameras LEDC1 LEDB2 LEDB1 LEDA2 PIN CONNECTIONS 1 LEDA1 LEDC2 SDA GND GND C2+ C1+ C2− C1− EN VOUT Drives 6 LED Channels Independent Current on 3 Pairs of LEDs I2C Serial Interface Programming Adjustable Current to 32 mA in 0.5 mA Step Power Efficiency up to 91% Fractional Pump 1x/1.5x Low Noise Input Ripple Fixed High Frequency Operation 1 MHz “Zero” Current Shutdown Mode Soft Start and Current Limiting Short Circuit Protection Thermal Shutdown Protection These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS Compliant Applications • • • • TQFN−16 HV4 SUFFIX CASE 510AE SCL Features • • • • • • • • • • • • • http://onsemi.com VIN The CAT3626 is a high efficiency 1x/1.5x fractional charge pump with programmable dimming current in six LED channels. To ensure uniform brightness in LCD backlight applications, each LED channel delivers an accurate regulated current. Low noise and input ripple is achieved by operating at a constant switching frequency of 1 MHz which allows the use of small external ceramic capacitors. The 1x/1.5x fractional charge pump supports a wide range of input voltages from 3 V to 5.5 V with efficiency up to 91%, and is ideal for Li−Ion battery powered devices. The LED channels are configured into three independent pairs, each containing 2 matched channels. Each pair can be separately programmed from zero to 32 mA, in 0.5 mA resolution steps, using the I2C serial interface. Any individual channel can be disabled while others remain active. When the enable input (EN) is low, the device is in shutdown mode drawing zero current. The device is available in a 16 −pad TQFN package with a max height of 0.8 mm. (4 x 4 mm) (Top View) MARKING DIAGRAMS G626 AXXX YMCC CDAJ AXXX YMCC G626 = CAT3626HV4−T2 CDAJ = CAT3626HV4−GT2 A = Assembly Location XXX = Last Three Digits of Assembly Lot Number Y = Production Year (Last Digit) M = Production Month (1−9, A, B, C) CC = Country of Origin (Two Digit) ORDERING INFORMATION Device Package CAT3626HV4−T2 (Note 1) TQFN−16 (Pb−Free) CAT3626HV4−GT2 (Note 2) TQFN−16 (Pb−Free) Shipping 2,000/ Tape & Reel 1. Matte−Tin Plated Finish (RoHS−compliant). 2. NiPdAu Plated Finish (RoHS−compliant). © Semiconductor Components Industries, LLC, 2010 March, 2010 − Rev. 5 1 Publication Order Number: CAT3626/D CAT3626 1 mF VIN 3 V to 5.5 V CIN 1 mF ENABLE I2C Interface 1 mF pair A C1− C1+ C2− C2+ VIN VOUT CAT3626 LEDA1 LEDA2 LEDB1 EN LEDB2 SDA LEDC1 SCL LEDC2 GND pair B pair C COUT 1 mF 20 mA Figure 1. Typical Application Circuit Table 1. ABSOLUTE MAXIMUM RATINGS Parameters Ratings Units VIN, LEDxx voltage 6 V VOUT, C1±, C2± voltage 7 V EN, SDA, SCL voltage VIN + 0.7 V V Storage Temperature Range −65 to +160 °C Junction Temperature Range −40 to +150 °C 300 °C Lead Temperature 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. Table 2. RECOMMENDED OPERATING CONDITIONS Parameter Range VIN Ambient Temperature Range LED forward voltage ILED per LED pin NOTE: Typical application circuit with external components is shown above. http://onsemi.com 2 Units 3 to 5.5 V −40 to +85 °C Up to 4.2 V 0 to 32 mA CAT3626 Table 3. ELECTRICAL OPERATING CHARACTERISTICS VIN = 3.6 V, EN = High, ambient temperature of 25°C (over recommended operating conditions unless specified otherwise) Symbol Parameter Test Conditions IQ Quiescent Current 1x mode, all LEDs Off 1x mode, all LEDs On 1.5x mode, all LEDs Off IQSHDN Shutdown Current VEN = 0 V ILED LED Current Range with 6 LEDs Min Typ Max 0.5 2.2 3.5 0 0 Units mA 1 mA 32 mA ILED−ACC LED Current Accuracy 1 mA v ILED v 31 mA ±3 % ILED−DEV LED Channel Matching (ILED − ILEDAVG) / ILEDAVG ±3 % ROUT Output Resistance (open loop) 1x mode, IOUT = 120 mA 1.5x mode, IOUT = 120 mA 0.5 2.8 W FOSC Charge Pump Frequency 0.8 1 1.3 MHz ISC_MAX Output short circuit Current Limit VOUT < 0.5 V 60 mA IIN_MAX Input Current Limit 1x mode, VOUT > 1 V 300 mA IEN VHI−EN VLO−EN EN Pin − Input Leakage − Logic High Level − Logic Low Level −1 1.3 1 0.4 mA V V 0.3 x VIN V V VHI VLO I2C SDA, SCL − High Level Input Voltage − Low Level Input Voltage TSD Thermal Shutdown 165 °C THYS Thermal Hysteresis 20 °C VUVLO Under−voltage lock out (UVLO) threshold 2 V 0.7 x VIN http://onsemi.com 3 CAT3626 Table 4. A.C. CHARACTERISTICS For 3 V ≤ VIN ≤ 5.5 V, over full ambient temperature range −40°C to +125°C (over recommended operating conditions unless specified otherwise). Symbol Max Unit fSCL Clock Frequency 400 kHz tAA SCL Low to SDA Data Out and ACK Out 0.9 ms tBUF Bus Free Time Before a New Transmission Can Start 1.2 ms Start Condition Hold Time 0.6 ms tLOW Clock Low Period 1.2 ms tHIGH tHD:STA Parameter Min Typ Clock High Period 0.6 ms tSU:STA Start Condition Setup Time (For a Repeated Condition) 0.6 ms tHD:DAT Data In Hold Time 0 ns tSU:DAT Data In Setup Time 100 ns tR SDA and SCL Rise Time 0.3 ms tF SDA and SCL Fall Time 300 ns tSU:STO tDH Stop Condition Setup Time 0.6 ms Data Out Hold Time 50 ns tF tHIGH tLOW tR tLOW SCL tSU:STA tSU:DAT tHD:SDA tSU:STO SDA IN tAA tHD:DAT tDH SDA OUT Figure 2. I2C Bus Timing Characteristics http://onsemi.com 4 tBUF CAT3626 TYPICAL CHARACTERISTICS (VIN = 3.6 V, IOUT = 90 mA (6 LEDs at 15 mA), EN = VIN, CIN = C1 = C2 = COUT = 1 mF, TAMB = 25°C, unless otherwise specified.) 100 100 15 mA per LED 90 90 80 80 EFFICIENCY (%) EFFICIENCY (%) 1x Mode 70 60 1.5x Mode 50 4.0 70 60 VIN = 3.2 V (1.5x mode) 50 20 mA per LED 40 4.2 VIN = 4 V (1x mode) 3.8 3.6 3.4 SUPPLY VOLTAGE (V) 3.2 40 3.0 0 50 100 150 TOTAL LED CURRENT (mA) Figure 3. Efficiency vs. Supply Voltage (6 LEDs) Figure 4. Efficiency vs. Total LED Current (6 LEDS) 0.8 QUIESCENT CURRENT (mA) QUIESCENT CURRENT (mA) 0.8 0.6 0.4 6 LEDs OFF 0.2 0 3.0 3.2 3.4 3.6 3.8 4.0 0.6 0.4 0.2 6 LEDs OFF 0 −40 4.2 0 SUPPLY VOLTAGE (V) 80 120 Figure 6. Quiescent Current vs. Temperature (1x Mode) 5 QUIESCENT CURRENT (mA) 5 QUIESCENT CURRENT (mA) 40 TEMPERATURE (°C) Figure 5. Quiescent Current vs. Supply Voltage (1x Mode) 4 3 2 6 LEDs OFF 1 0 200 3.0 3.2 3.4 3.6 3.8 SUPPLY VOLTAGE (V) 4.0 4 3 2 1 6 LEDs OFF 0 −40 4.2 Figure 7. Quiescent Current vs. Supply Voltage (1.5x Mode) 0 40 TEMPERATURE (°C) 80 120 Figure 8. Quiescent Current vs. Temperature (1.5x Mode) http://onsemi.com 5 CAT3626 TYPICAL CHARACTERISTICS 5.0 5.0 4.0 4.0 LED CURRENT CHANGE (%) LED CURRENT CHANGE (%) (VIN = 3.6 V, IOUT = 90 mA (6 LEDs at 15 mA), EN = VIN, CIN = C1 = C2 = COUT = 1 mF, TAMB = 25°C, unless otherwise specified.) 3.0 2.0 1x Mode 1.0 0 −1.0 −2.0 1.5x Mode −3.0 −4.0 −5.0 3.0 3.2 3.4 3.6 3.8 SUPPLY VOLTAGE (V) 4.0 3.0 2.0 1.0 0 −1.0 −2.0 −3.0 −4.0 −5.0 −40 4.2 Figure 9. LED Current Change vs. Supply Voltage SWITCHING FREQUENCY (MHz) SWITCHING FREQUENCY (MHz) 80 1.1 1.0 0.9 0.8 3.2 3.4 3.6 SUPPLY VOLTAGE (V) 3.8 1.2 1.1 1.0 0.9 0.8 0.7 −40 4.0 Figure 11. Switching Frequency vs. Supply Voltage 0 40 TEMPERATURE (°C) 80 120 Figure 12. Switching Frequency vs. Temperature 4.0 OUTPUT RESISTANCE (W) 1.0 OUTPUT RESISTANCE (W) 60 1.3 1.2 0.8 0.6 0.4 0.2 0 3.0 0 20 40 TEMPERATURE (°C) Figure 10. LED Current Change vs. Temperature 1.3 0.7 3.0 −20 3.5 3.0 2.5 2.0 1.5 1.0 3.2 3.4 3.6 3.8 4.0 4.2 3.0 3.2 3.4 3.6 3.8 4.0 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) Figure 13. Output Resistance vs. Supply Voltage (1x Mode) Figure 14. Output Resistance vs. Supply Voltage (1.5x Mode) http://onsemi.com 6 4.2 CAT3626 TYPICAL CHARACTERISTICS (VIN = 3.6 V, IOUT = 90 mA (6 LEDs at 15 mA), EN = VIN, CIN = C1 = C2 = COUT = 1 mF, TAMB = 25°C, unless otherwise specified.) Figure 15. Power Up with 6 LEDs at 15 mA (1x Mode) Figure 16. Power Up with 6 LEDs at 15 mA (1.5x Mode) Figure 17. Enable Power Down (1x Mode) Figure 18. Enable Power Down (1.5x Mode) Figure 19. Switching Waveforms in 1.5x Mode Figure 20. Operating Waveforms in 1x Mode http://onsemi.com 7 CAT3626 TYPICAL CHARACTERISTICS (VIN = 3.6 V, IOUT = 90 mA (6 LEDs at 15 mA), EN = VIN, CIN = C1 = C2 = COUT = 1 mF, TAMB = 25°C, unless otherwise specified.) 4.0 OUTPUT VOLTAGE (V) 3.5 3.0 2.5 1x Mode 2.0 1.5 1.0 0.5 0 0 100 200 300 400 OUTPUT CURRENT (mA) Figure 22. Foldback Current Limit 4.0 4.0 3.5 3.5 3.0 3.0 2.5 2.5 VIL (V) VIH (V) Figure 21. Line Transient Response in 1x Mode 2.0 1.5 2.0 1.5 1.0 1.0 0.5 0.5 0 3.0 3.5 4.0 4.5 SUPPLY VOLTAGE (V) 5.0 0 5.5 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V) Figure 23. SDA, SCL VIH vs. Supply Voltage Figure 24. SDA, SCL VIL vs. Supply Voltage http://onsemi.com 8 CAT3626 Table 5. PIN DESCRIPTIONS Pin # Name 1 LEDA1 Cathode terminal of LED A1 Function 2 SDA I2C Serial data input/output 3 SCL I2C Serial clock input 4 EN Enable input 5 VOUT Charge pump output connected to the LED anodes 6 VIN Supply voltage 7 C1− Bucket capacitor 1 terminal 8 C1+ Bucket capacitor 1 terminal 9 C2− Bucket capacitor 2 terminal 10 C2+ Bucket capacitor 2 terminal 11 GND Ground reference 12 LEDC2 Cathode terminal of LED C2 13 LEDC1 Cathode terminal of LED C1 14 LEDB2 Cathode terminal of LED B2 15 LEDB1 Cathode terminal of LED B1 16 LEDA2 Cathode terminal of LED A2 TAB Connect to Ground on PCB Pin Function VIN is the supply pin for the charge pump. A small 1 mF ceramic bypass capacitor is required between the VIN pin and ground near the device. The operating input voltage range is from 2.2 V to 5.5 V. Whenever the input supply falls below the undervoltage threshold (2 V), all LEDs channels will be automatically disabled. EN is the enable logic input for the driver. Guaranteed levels of logic high and logic low are set at 1.3 V and 0.4 V respectively. When EN is initially taken high, the device becomes enabled and all LED currents remain at 0 mA. To place the device into zero current shutdown mode, the EN pin must be held low. SDA is the I2C serial data line. This is a bidirectional line allowing data to be written into and read from the four registers in the driver. Registers RegA/B/C set the LED current in each pair of channels, while RegEn sets the On/Off state independently of each channel. SCL is the I2C serial clock input. VOUT is the charge pump output that is connected to the LED anodes. A small 1 mF ceramic bypass capacitor is required between the VOUT pin and ground near the device. GND is the ground reference for the charge pump. The pin must be connected to the ground plane on the PCB. C1+, C1− are connected to each side of the 1 mF ceramic bucket capacitor C1. C2+, C2− are connected to each side of the 1 mF ceramic bucket capacitor C2. LEDxx provide the internally regulated current to the six LED cathodes. These pins enter a high−impedance zero−current state whenever the device is placed in shutdown mode. In applications using less than six LEDs, the unused channels should be disabled through the RegEn register. TAB is the exposed pad underneath the package. For best thermal performance, the tab should be soldered to the PCB and connected to the ground plane. http://onsemi.com 9 CAT3626 Block Diagram C1− VIN 1 mF C1+ C2− 1 mF C2+ 1x mode (LDO) 1.5x Charge Pump CIN VOUT COUT 1 mF 1 mF Mode Control 1 MHz Oscillator EN LEDA1 LEDA2 LEDB1 LEDB2 LEDC1 LEDC2 Reference Voltage Current Setting DAC SDA SCL Serial Interface 6 Current Sink Regulators Registers GND Figure 25. CAT3626 Functional Block Diagram Basic Operation At power−up, the CAT3626 starts operating in 1x mode where the output will be approximately equal to the input supply voltage (less any internal voltage losses). If the output voltage is sufficient to regulate all LEDs currents the device remains in 1x operating mode. If the input voltage is insufficient or falls to a level where the regulated currents cannot be maintained, the device automatically switches (after a fixed time of 400 ms) into 1.5x mode. In 1.5x mode, the output is approximately equal to 1.5 times the input supply voltage (less any internal voltage losses). The above sequence is repeated each and every time the chip is either powered−up or taken out of shutdown (via EN pin), or the RegEn register is accessed by write cycle. LED Current Setting The LED current setting is programmed via the I2C serial interface and is stored in four 8−bit registers RegA, RegB, RegC and RegEn as follows: • RegA stores the LED current for group A (LEDA1 and LEDA2 channels), • RegB stores the LED current for group B (LEDB1 and LEDB2 channels), • RegC stores the LED current for group C (LEDC1 and LEDC2 channels), • RegEn selects the on/off state of each of the 6 LED channels. At each write access to RegEn, the driver automatically reconfigures to the mode (1x or 1.5x) that provides the highest efficiency. Table 6. REGISTER ADDRESS AND DATA CONFIGURATION (Note 3) Bit Pattern Register Name Register Address Bit 7 Bit 6 RegA 0 X X RegB 1 X X RegC 2 X X RegEn 3 X X Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 See Table 7 for values LEDC2 LEDC1 LEDB2 LEDB1 LEDA2 LEDA1 On = 1 Off = 0 On = 1 Off = 0 On = 1 Off = 0 On = 1 Off = 0 On = 1 Off = 0 On = 1 Off = 0 3. X = not used, 1 = logic high, 0 = logic low http://onsemi.com 10 CAT3626 The Table 7 lists the various LED currents with the associated RegA, RegB, and RegC register values. Table 7. LED CURRENT SELECTION AND REGISTER VALUE (Note 4) LED Current (mA) D7 D6 D5 D4 D3 D2 D1 D0 Dec LED Current (mA) D7 D6 D5 D4 D3 D2 D1 D0 Dec 0.5 X X 0 0 0 0 0 0 0 16.5 X X 1 0 0 0 0 0 32 1.0 X X 0 0 0 0 0 1 1 17.0 X X 1 0 0 0 0 1 33 1.5 X X 0 0 0 0 1 0 2 17.5 X X 1 0 0 0 1 0 34 2.0 X X 0 0 0 0 1 1 3 18.0 X X 1 0 0 0 1 1 35 2.5 X X 0 0 0 1 0 0 4 18.5 X X 1 0 0 1 0 0 36 3.0 X X 0 0 0 1 0 1 5 19.0 X X 1 0 0 1 0 1 37 3.5 X X 0 0 0 1 1 0 6 19.5 X X 1 0 0 1 1 0 38 4.0 X X 0 0 0 1 1 1 7 20.0 X X 1 0 0 1 1 1 39 4.5 X X 0 0 1 0 0 0 8 20.5 X X 1 0 1 0 0 0 40 5.0 X X 0 0 1 0 0 1 9 21.0 X X 1 0 1 0 0 1 41 5.5 X X 0 0 1 0 1 0 10 21.5 X X 1 0 1 0 1 0 42 6.0 X X 0 0 1 0 1 1 11 22.0 X X 1 0 1 0 1 1 43 6.5 X X 0 0 1 1 0 0 12 22.5 X X 1 0 1 1 0 0 44 7.0 X X 0 0 1 1 0 1 13 23.0 X X 1 0 1 1 0 1 45 7.5 X X 0 0 1 1 1 0 14 23.5 X X 1 0 1 1 1 0 46 8.0 X X 0 0 1 1 1 1 15 24.0 X X 1 0 1 1 1 1 47 8.5 X X 0 1 0 0 0 0 16 24.5 X X 1 1 0 0 0 0 48 9.0 X X 0 1 0 0 0 1 17 25.0 X X 1 1 0 0 0 1 49 9.5 X X 0 1 0 0 1 0 18 25.5 X X 1 1 0 0 1 0 50 10.0 X X 0 1 0 0 1 1 19 26.0 X X 1 1 0 0 1 1 51 10.5 X X 0 1 0 1 0 0 20 26.5 X X 1 1 0 1 0 0 52 11.0 X X 0 1 0 1 0 1 21 27.0 X X 1 1 0 1 0 1 53 11.5 X X 0 1 0 1 1 0 22 27.5 X X 1 1 0 1 1 0 54 12.0 X X 0 1 0 1 1 1 23 28.0 X X 1 1 0 1 1 1 55 12.5 X X 0 1 1 0 0 0 24 28.5 X X 1 1 1 0 0 0 56 13.0 X X 0 1 1 0 0 1 25 29.0 X X 1 1 1 0 0 1 57 13.5 X X 0 1 1 0 1 0 26 29.5 X X 1 1 1 0 1 0 58 14.0 X X 0 1 1 0 1 1 27 30.0 X X 1 1 1 0 1 1 59 14.5 X X 0 1 1 1 0 0 28 30.5 X X 1 1 1 1 0 0 60 15.0 X X 0 1 1 1 0 1 29 31.0 X X 1 1 1 1 0 1 61 15.5 X X 0 1 1 1 1 0 30 31.5 X X 1 1 1 1 1 0 62 16.0 X X 0 1 1 1 1 1 31 32.0 X X 1 1 1 1 1 1 63 4. X = not used, 1 = logic high, 0 = logic low http://onsemi.com 11 CAT3626 I2C Interface The LED driver is interfaced through a 2−wire serial I2C−bus in order to control the state and the current in each of the six LED channels. The SDA and SCL lines comply with the I2C electrical specification and should be terminated with pull−up resistors. When the bus is not used, both lines are high. The device supports the maximum bus speed of 400 kbit/s. The serial bit sequence is shown below for read and write operations into the registers. Read and write instructions are initiated by the master controller/CPU and acknowledged by the slave LED driver. The I2C address of the driver is internally fixed to the binary value 1100110. The protocol requires that the start bit and the device address are both repeated. For further details on the I2C protocol, please refer to the I2C−Bus Specification, document number 9398 393 40011, from Philips Semiconductors. • Read operation: S Slave address W A Register address A W A Register address A S Slave address R A Data • Write operation: S Slave address S: R, W: A: A*: P: Slave address: Register address: Data: Data A P Start condition Read bit (1), Write bit (0) Acknowledge sent by the slave LED driver (SDA high) Not Acknowledge sent by the master microcontroller (SDA low) Stop condition Device address 7 bits (MSB first, slave address is 1100110). Device register address 8 bits Data to read or write 8 bits Figure 26. Write Instruction Sequence Figure 27. Write Instruction Example Setting 20 mA Current in LEDB1 and LEDB2 SDA SCL 1−7 ADDRESS START Condition 8 9 R/W ACK 1−7 8 ADDRESS 9 ACK 1−7 8 DATA 9 ACK STOP Condition Figure 28. I2C Bus Protocol http://onsemi.com 12 A* P CAT3626 Typical Application The CAT3626 is ideal for driving RGB (red green blue) LEDs with common anode configuration. The individual LED currents associated with the red, green and blue LEDs are programmable independently through the I2C interface, 1 mF 1 mF C1− VIN 3 V to 5.5 V CIN C1+ C2− VIN ENABLE C2+ RGB LED VOUT CAT3626 1 mF I2C Interface allowing to generate an accurate color mixing. Dimming while maintaining the same color can be done by reprogramming the RegEn register on and off with the appropriate duty cycle (PWM mode). EN SDA SCL GND LEDA1 LEDA2 LEDB1 LEDB2 LEDC1 LEDC2 COUT Red Figure 29. RGB LED http://onsemi.com 13 Green Blue 1 mF CAT3626 Example of Ordering Information (Note 7) 5. 6. 7. 8. 9. Prefix Device # Suffix CAT 3626 HV4 −G T2 Company ID (Optional) Product Number 3626 Package HV4: TQFN 4 x 4 mm Lead Finish G: NiPdAu Blank: Matte−Tin (Note 8) Tape & Reel (Note 9) T: Tape & Reel 2: 2,000 / Reel All packages are RoHS−compliant (Lead−free, Halogen−free). The standard lead finish is NiPdAu. The device used in the above example is a CAT3626HV4−GT2 (TQFN, NiPdAu Plated Finish, Tape & Reel, 2,000/Reel). For Matte−Tin package option, please contact your nearest ON Semiconductor Sales office. For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. http://onsemi.com 14 MECHANICAL CASE OUTLINE PACKAGE DIMENSIONS TQFN16, 4x4 CASE 510AE−01 ISSUE A DATE 18 MAR 2009 A D DETAIL A E2 E PIN#1 ID PIN#1 INDEX AREA TOP VIEW SIDE VIEW SYMBOL MIN NOM MAX A 0.70 0.75 0.80 A1 0.00 0.02 0.05 A3 BOTTOM VIEW e b 0.20 REF b 0.25 0.30 0.35 D 3.90 4.00 4.10 D2 2.00 −−− 2.25 E 3.90 4.00 4.10 E2 2.00 −−− 2.25 e L D2 A1 0.65 BSC 0.45 −−− Notes: (1) All dimensions are in millimeters. (2) Complies with JEDEC MO-220. DOCUMENT NUMBER: DESCRIPTION: 98AON34374E TQFN16, 4X4 0.65 L DETAIL A A A1 A3 FRONT VIEW Electronic versions are uncontrolled except when accessed directly from the Document Repository. Printed versions are uncontrolled except when stamped “CONTROLLED COPY” in red. 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