CAT3649AGEVB

CAT3649AGEVB CAT3649 Evaluation Board User's Manual Introduction http://onsemi.com This document describes the CAT3649 evaluation board for the ON Semiconductor CAT3649 6−Channel Quad−Mode LED Driver with an Ambient Light Sensor circuit, NOA1211, that can control the LEDs intensity proportionally with the ambient light intensity. The functionality and major parameters of the CAT3649 can be evaluated with the CAT3649 evaluation board. A detailed description and electrical characteristics are available in the CAT3649 and NOA1211 datasheets. EVAL BOARD USER’S MANUAL Board Hardware The evaluation board contains one CAT3649 in an application circuit driving a total of six LEDs and one NOA1211. The Ambient Light Sensor is connected to the LED driver via the C8051F321 microcontroller, which is illustrated in Figure 2. Figure 1. CAT3649 Evaluation Board Figure 2. Ambient Light Sensor Mode Block Diagram © Semiconductor Components Industries, LLC, 2012 November, 2012 − Rev. 1 1 Publication Order Number: EVBUM2164/D CAT3649AGEVB Figure 3. CAT3649AGEVB Board Schematic Table 1. BILL OF MATERIALS* Manufacturer Part Number Substitution Allowed ON Semiconductor CAT3649HV3-GT2 No 3 x 3 mm ON Semiconductor NOA1211 No - CUDFN Silicon Laboratories C8051F321 Yes (5 V to 3.3 V) - 1.6 x 1.6 ON Semiconductor CAT6218-330TDG No 5 V Voltage Regulator - - MLP-28 ON Semiconductor MC78M05ABDT No 6 White LED - - SOT-223 Lite-On LTW-150TK Yes 1 Red LED - - DPAK-3 Everlight EL17-215SURC Yes C1 to C4, C6, C8, C11, C13 8 Ceramic Capacitor 1 mF / 10 V, X7R 10% 1206 Kemet C0805C105K9RACTU Yes C7, C9, C10, C16, C14 5 Ceramic Capacitor 100 nF 10% 0805 AVX 0805ZC104KAT2A Yes C5 1 Ceramic Capacitor 47 nF 10% 0805 AVX 08053C473KAT2A Yes C15 1 Tantalum Capacitor 10 mF/10V 10% 0805 Vishay TM8R106K010UBA Yes Designator Value Tolerance Qty Description U1 1 6 Channel LED Driver Footprint Manufacturer - - TQFN16 U2 1 Ambient Light Sensor - - U3 1 8 bit Microcontroller - U4 1 Low Dropout Regulator U5 1 D1 to D6 D7 *All products listed are Pb−free. http://onsemi.com 2 CAT3649AGEVB Table 1. BILL OF MATERIALS* Designator Qty Description R1 1 SMD Resistor R2 1 R3 1 R4, R5 Manufacturer Manufacturer Part Number Substitution Allowed Vishay RL0805K100-1 Yes 1210 Vishay RL0805K004.7-1 Yes 0805 Vishay RL0805K180-1 Yes 1% 0805 Vishay RL0805K022-1 Yes 1/8 W, 100 kW 1% 0805 Vishay RL0805K100-1 Yes 1/8 W, 200 W 1% 0805 Vishay RL0805E200-1 Yes Value Tolerance Footprint 1/8 W, 100 kW 1% 0805 SMD Resistor 1/8 W, 4.7 kW 1% SMD Resistor 1/8 W, 180 W 1% 2 SMD Resistor 1/8 W, 22 kW R6 1 SMD Resistor R7 1 SMD Resistor R10 1 SMD Resistor 1/8 W, 0.5 W 1% 0805 Yageo RL0805FR-070R5L Yes J1 to J6, J8 to J11 10 3-pin Header Connector, 0.1”, Single Strip - - 1.54 mm x 4.62 mm MMM 2303-6211TG Yes J7 1 2-pin Header Connector, 0.1”, Single Strip - - 1.54 mm x 3.08 mm MMM 2302-6211TG Yes ISP 1 5-pin Header Connector, 0.1”, Single Strip - - 1.54 mm x 7.70 mm MMM 2305-6211TG Yes T1 – T8 8 Pin Receptacle (Test Points) - - 1.54 mm x 1.54 mm Mil-Max Various Yes K1 1 Slide Switch, SPDT - - 11.60 mm x 4.00 mm E-Switch EG1218 Yes SW1, SW2 2 Pushbutton - - 3.50 mm x 6.00 mm Schukat DTS31N Yes BTH 1 Battery Holder 9 V - - 53.90 mm x 29.60 mm Keystone 1294K-ND Yes *All products listed are Pb−free. Operating Procedure The CAT3649EVAL board can be configured in two operating modes: stand−alone or PC−controlled. In both operating modes, the supply source for the VIN rail is selected by the jumper J10 to be either 5 V or 3.3 V. Table 2 shows the configurations for jumper J10 to set the VIN voltage. The EN/DIS pushbutton allows the user to enable or to shutdown the CAT3649 device. The DIM pushbutton allows the user to program the LED current in 32 discrete values. On each press on this pushbutton, the “ADIM” input receives a 50 ms pulse. On the rising edge of the pulse, the LED current is decreased by 3.2% from full scale. The user can obtain the same effect by continuously holding the DIM pushbutton down. For each 0.4 second interval, the “ADIM” input of the device will receive a pulse. Table 2. VIN SELECTION J10 VIN 1−2 5V 2−3 3.3 V PC Controlled The CAT3649 EVAL board is equipped with a 8−bit microcontroller and can be connected to the PC via USB interface using a USB A/B type cable. This cable can be obtained from a local electronics supply store. The jumper J11 must be set in (1−2) position for USB power operation. The jumpers J8 and J9 must be set to (2−3) position to for control of EN/DIS, ADIM, and PWM via USB. In this mode, the board is powered from the USB interface. The GUI commands are described in the section “Graphical User Interface (GUI)”. Stand−alone In this configuration, only the “Analog dimming” function can be tested. The Ambient Light Sensor (ALS) is disabled in this mode. The jumper J11 must be set in (2−3) position for stand−alone operation power. The jumpers J8 and J9 must be set to (2−3) position to use onboard pushbuttons EN/DIS and ADIM. The evaluation board can be powered either from an on−board 9 V supply (9 V alkaline battery) or from an external supply applied between VBAT and GND test points (located on the bottom side of the board, near the pins for the battery holder). http://onsemi.com 3 CAT3649AGEVB Graphical User Interface (GUI) After connecting the CAT3649 EVAL board to the PC via USB cable, the user can run the program CAT3649EVAL.exe. If the program is started without the USB connection, the following message is displayed: “The CAT3649EVAL Board is not detected!”. The CAT3649 operating mode is selected by pressing one of the “check” buttons “PWM” or “ADIM”. If the option button “Select” of the frame of the Ambient Light Sensor is pressed while in PWM mode, the “Gain” frame will be enabled. In this frame only the “Power Down” option is selected, because the “Ambient Light Sensor”, at this moment, is off. (Figure 9). The user can select one of the options “Medium” or “Low” corresponding at the LED’s intensity level domain. (Figure 10). Depending of the light’s intensity exposed to the sensor, the LEDs will light proportionally. Operating mechanism is as follows: The sensor outputs a current proportional to the ambient light. This current is converted to an output voltage by resistor R6. The output voltage is applied to the input of the 10−bit ADC (Analog to Digital Convertor) from the microcontroller. The microcontroller converts the digital value, received from ADC, into a PWM signal applied to the CAT3649 LED Driver. CAT3649 controls the six LEDs’ intensity. PWM Operation Mode At start−up, on the GUI is selected, automatically, the PWM mode of operation (as shown on Figure 4). In this mode, the user can increase/decrease the LEDs intensity by moving the potentiometer cursor or by pressing the keys “−>” and “