CAT3626AEVB

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Detailed descriptions and electrical characteristics are in the CAT3626 data sheet. This document describes the CAT3626DB1 evaluation/demonstration board for the ON Semiconductor CAT3626 6−Channel LED driver with I2C interface. The functionality and major parameters of the CAT3626 can be evaluated with the CAT3626DB1 board. The CAT3626 is a 6−channel charge pump that has been designed to drive up to 6 LEDs connected in parallel. The device can drive three groups of two LEDs. Each group can be configured with independent LED current of up to 32 mA max per channel through the I2C serial interface. The CAT3626 is operating in either 1x mode (LDO), or 1.5x mode and provides tightly matched regulated current through the six LED outputs. Each LED channel can be also VEXT CAT3626EVAL1 Board Hardware The board contains the CAT3626 in a typical application circuit, driving 2 RGB LEDs or 6 white LEDs. The CAT3626 is controlled through the I2C serial interface using an 8−bit microcontroller. The user can chose to drive on/off any LEDs combination or to set the desired LED current through a PC serial interface. The board is powered from an attached 9 V battery. The block diagram of the board hardware schematic is shown in Figure 1. VIN VOUT C2 1 mF C3 C4 1 mF 1 mF Power Supply C1 3V C1 VIN 5V C1 K1 C2 J7 C2 VOUT J1 J2 J3 J4 J5 J6 LED A1 1 mF LED A2 VBAT 9V LED B1 8 Bit MCU EN LED B2 SDA LED C1 SCL LED C2 CAT3626 PC Serial Interface 2 x RGB LED Figure 1. CAT3626DB1 Block Schematic  Semiconductor Components Industries, LLC, 2011 September, 2011 − Rev. 3 1 Publication Order Number: EVBUM2018/D CAT3626AEVB sets different LED current values for each of 3 groups LED output channels. As a result the 2 RGB LEDs will provide the colors mixing between RED, GREEN and BLUE with different intensities. This loop is executed as long as the board is powered. NOTE: To use as a stand−alone board, the J9 connector must have the jumper removed; otherwise, the microcontroller does not start the routine of controlling the CAT3626 at power−on. The CAT3626 input voltage, VIN is supplied on board from a fixed +5 V or +3 V voltage (internally provided) or from an external voltage applied to the VEXT (T5) pad. The voltage supplied at the VIN input of the CAT3626 device can be selected using the jumper options for the K1 connector. When using an internal supply (9 V battery), set the jumper to position 1−6 for the +5 V voltage or to position 2−5 for the +3 V voltage. To apply an external voltage, a shunt must be placed in position 3−4 and an additional shunt must be placed in either the 1−6 or 2−5 position. The board uses an 8−bit microcontroller, 8051 type. The microcontroller provides the signals on the SCL, SDA and EN lines to control the CAT3626. The user can connect, or disconnect the CAT3626 outputs to the LEDs using the jumper options for J1, J2, J3, J4, J5, J6 and J7 connectors. J1 to J7 header pin connectors can be used to insert a current meter to evaluate the programmed LED current on each channel. The board is powered when the “POWER” switch is ON. The CAT3626DB1 boards are populated with two RGB LEDs (Everlight EL61−23RGBC). The component placement, top side, for the CAT3626DB1 and the board picture are shown in Figure 2. The detailed schematic and the list of components for the CAT3626DB1 are shown in the Appendix attached in the end of this document. CAT3626DB1 Board Controlled through the PC Serial Interface The user can set the desired LED current value for each of CAT3626 output channel connecting the CAT3626DB1 through a PC serial interface. The CAT3626DB1 software provides the user a very friendly graphical interface (GUI) for sending all the commands to drive on/off any LEDs configuration and to program the LEDs current. The CAT3626DB1 software requires the following minimum system configuration:  Microsoft Windows 98SE or Above  100K of Available Hard Disc Space  Serial Interface Port The software is available on the CAT3626DB1 software distribution CD−ROM or can be downloaded at: http://www.onsemi.com/PowerSolutions/evalBoard.do?i d=CAT3626AEVB Board Operation Stand−alone Board The CAT3626DB1 software is an executable program (“CAT3626DB.exe”) which can be run from any directory or CD. The board can be also used as a demonstration board without connection to the PC interface. As a standalone board, when the POWER switch is turned ON, the microcontroller starts executing a routine that sequentially Figure 2. CAT3626DB1 Component Placement − Top Side http://onsemi.com 2 CAT3626AEVB CAT3626 will be enabled. After setting the EN input high, the user can write into the Register_S to activate the corresponding LED output channels. Figure 4 shows all the LED channels active. The current for each channel is set at the minimum value (= 0.5 mA). 7. Using the CAT3626DB1 software the user can access all the internal registers of the CAT3626:  Register A: set the LED current for group A (LEDA1, LEDA2) – associated with Red from RGB LEDs  Register B: set the LED current for group B (LEDB1, LEDB2) – associated with Green from RGB LEDs  Register C: set the LED current for group C (LEDC1, LEDC2) – associated with Blue from RGB LEDs  Register S: controls the ON/OFF state of each LED channel independently. The following steps should be followed to control the CAT3626DB1 demo board from the PC: 1. Connect the CAT3626DB1 board to the PC serial port through a cable with 9−pin connectors, extender type. (For a limited quantity the connection cable is provided). 2. Connect a jumper shunt at J9 connector. This allows the CAT3626 to remain disabled (EN = “0”) at power−on. 3. Power the CAT3626DB1 board: Turn the “POWER” switch ON. (The board should be powered when you start the program; otherwise an error message will be displayed). 4. Run the “CAT3626DB.exe” program from the directory where the software was installed. 5. The CAT3626 Demo Board user interface window opens (Figure 3). 6. When the program starts, the board will be in the disabled state. Press the “ENABLE” button and the Figure 3. CAT3626DB1 Software Interface Window (Start Window) buttons to write and respectively read data. The current value can be also changed moving the cursor or/and pressing the arrows buttons on the slider associated to each register. As an example, Figure 5 shows all the channels enabled and the LED currents set to 15 mA (Group A – Red), 30 mA (Group B – Green) and 3 mA (Group C – Blue). The user can set the current for any group, writing the associated register with the desired value. The current can be set between 0.5 mA and 32 mA. These 64 steps corresponds to the binary registers values of XX000000 to XX111111. The user can change the LED current value writing the corresponding binary value in the associated Register (A, B or C). Every register has associated “Write” and “Read” http://onsemi.com 3 CAT3626AEVB Figure 4. CAT3626DB1 with All Channels Enabled and LED Current Set to Min Value Figure 5. CAT3626DB1 Board Sets LED Current Independently for each LED Group http://onsemi.com 4 Figure 6. CAT3626DB1 Board Schematic http://onsemi.com 22 pF C14 180K R1 1 mF R3 6 5 4 3 2 1 8 9 10 ENABLE SDA SCL SDA SCL RxD TxD P0.7 P0.6 VDD P0.5 P0.4 P89LPC922FDH P1.2 SCL P1.3 SDA P1.4 XTAL2 XTAL1 VSS RES P1.6 P1.7 P0.3 P0.1 P0.2 P0.0 U2 11 2 3 6 ENABLE 4 VCC = 5 V 5K1 5K1 R2 X1 11.0592 MHz 7 RESET R4 22K VDD = 3 V C3 J9 VIN C13 22 pF T2 T1 C1+ CAT3626 C1− 12 13 14 15 16 17 18 19 Rx Tx 1 mF C12 VDD = 3 V 2 X EL61−23RGBC 20 11 C2− LED C2 LED C1 LED B2 LED B1 LED A2 LED A1 Vout C2+ 11 10 13 8 1 3 4 C6 C5 C7 0.1 mF 0.1 mF 0.1 mF TxPC C8 0.1 mF 2 6 4 5 V+ V− 1 D8 2 J1 T3 1 2 T4 LED+ VOUT C11 0.1 mF VCC = 5 V J7 14 RxPC T1OUT 7 T2OUT Rx 12 R1OUT 9 VDD = 3 V R2OUT C9 16 VCC 0.1 mF 15 GND ICL3232E C2+ C2− R1IN R2IN C1+ C1− T1IN T2IN U3 3 5 D1 2 6 1 2 J2 1 Tx D7 D3 D2 1 1 L_A1 3 4 D4 2 J3 2 J4 L_A2 2 5 1 2 J5 L_B1 1 6 D5 D6 1 2 J6 VDD = 3 V 12 13 14 15 16 1 5 6 X NSCW100(335) GND SDA SCL Vin EN L_C1 L_B2 C1 J8 L_C2 C2 A1 1 mF 9 10 C1 B1 1 mF 8 7 B2 C2 U1 B1 C4 1 mF A2 C2 A1 A2 5 B2 C1 3 2 1 K1 RxPC RTS TxPC 3 2 1 6 2 7 3 8 4 9 5 U5 1 LM340MP−5.0 VIN C15 + 10 mF VDD = 3 V PP1 4 5 6 1 3 T7 BT1 ISP K2 T8 VBAT = 9 V T6 VEXT T5 VCC = 5 V VCC = 5 V VDD = 3 V RESET RTS C10 0.1 mF K3 VDD = 3 V 2 U4 LP8345CDT−3.3 CAT3626AEVB Appendix The detailed board schematics and the list of components are shown in Figure 6 and Table 1. CAT3626AEVB Table 1. CAT3626DB1 BOARD LIST OF COMPONENTS Name Manufacturer Description U1 ON Semiconductor 6−Channel LED Driver with I2C Interface, QFN16 CAT3626HS4 Part Number Units 1 U2 Philips Semiconductor 8−bit Flash Microcontroller TSSOP20 P89LPC922FDH 1 U3 Intersil RS−232 Transmitter/receiver, SOIC16 Narrow ICL3232ECBN 1 U4 National Semiconductor 3 V, 500 mA Voltage Regulator, DPAK LP8345CDT−3.3 1 U5 National Semiconductor 5 V Voltage Regulator, 1 A, SOT223 LM340MP−5.0 1 C1, C2, C3, C4, C12 AVX Ceramic Capacitor 1 mF/10 V, 10%, X5R, Size 0603 0603ZD105KAT2A 4 C5, C6, C7, C8, C9, C10, C11 AVX Ceramic Capacitor 0.1 mF/10 V, 10%, X7R, Size 0805 0805ZC104KAT2A 7 C13, C14 AVX Ceramic Capacitor 22 pF/100 V, 5% COG, Size 1206 12061A220JAT2A 2 C15 AVX Tantalum 10 mF/10 V, 10%, Low ESR TPSA106K010R1800 1 R1 Dale SMT Resistor 1/8 W, 180 kW, 1%, Size 0805 CRCW0805180KFKTA 1 R2, R3 Dale SMT Resistor 1/8 W, 5K1, 1%, Size 0805 CRCW08055K10FKTA 2 R4 Dale SMT Resistor 1/8 W, 22 kW, 1%, Size 0805 CRCW080522KFKTA 1 D1 to D6 Nichia White LED – Not Soldered NSCW100 6 D7, D8 Everlight RGB LED, SMD EL61−23RGBC 2 J1 to J7, J9 MMM 2−pin Header Connector, 0.1”, Single Strip 2302−6211TG 8 J8 MMM 4−pin Header Connector, 0.1”, Single Strip 23046211TG 1 K1 MMM 6−pin Header Connector, 0.1”, Double Strip 2308−62221TG 1 K3 ITT Cannon Slide switch L102−01−1−MS−02−Q2 1 X1 Vishay Crystal 11.0592 MHz XT9SNLANA11M0592 1 Specialty Electronics Jumper Shunts 2JM−G 9 PP1 ITT Cannon D−Sub−Plug 9−Pole Solder Pin DE−9P 1 T1 to T6 Mil−Max Pin Receptacle #0149−0−15−01−30−14−04−0 6 BTH Keystone Battery Holder 1x 9 V BHR1294 1 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. 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