28 CHANNELS LED DRIVER EVALUATION BOARD GUIDE DESCRIPTION RECOMMENDED EQUIPMENT IS31FL3235A is comprised of 28 constant current 5.0V, 2A power supply channels each with independent PWM control, designed for driving LEDs, PWM frequency can be ABSOLUTE MAXIMUM RATINGS 3kHz or 22kHz. The output current of each channel can be set at up to 38mA (Max.) by an external resistor and 5.5V power supply independently scaled by a factor of 1, 1/2, 1/3 and 1/4. Caution: Do not exceed the conditions listed above, otherwise The average LED current of each channel can be the board will be damaged. changed in 256 steps by changing the PWM duty cycle through an I2C interface. PROCEDURE The chip can be turned off by pulling the SDB pin low or by using the software shutdown feature to reduce The IS31FL3235A evaluation board is fully assembled power consumption. and tested. Follow the steps listed below to verify board operation. FEATURES Caution: Do not turn on the power supply until all connections are completed. 2.7V to 5.5V supply 1) Connect the ground terminal of the power supply I2C interface, automatic address increment to the GND and the positive terminal to the VCC. function Or connect the DC power to the connector Internal reset register (TP1&TP4). Modulate LED brightness with 256 steps PWM 2) Turn on the power supply and pay attention to the Each channel can be controlled independently supply current. If the current exceeds 1.2A, please Each channel can be scaled independently by 1, check for circuit fault. 1/2, 1/3 and 1/4 3) Enter the desired mode of display by toggling the PWM frequency selectable MODE button. - 3kHz (Default) - 22kHz EVALUATION BOARD OPERATION -40C to +85C temperature range The IS31FL3235A evaluation board has two display ESD HBM 8kV modes. Toggling the MODE button (K1) can switch the QFN-36 (4mm 4mm) package modes. 1) White LED Mode: White LEDs in three rows (27 QUICK START LEDs in each row) are light as raining effect. 2) RGB Mode: Nine RGBs in the middle of the board will show color flowing effect. Note: IS31FL3235A solely controls the FxLED function on the evaluation board. Figure 1: Photo of IS31FL3235A Evaluation Board ORDERING INFORMATION Part No. Temperature Range Package IS31FL3235A-QFLS2-EB -40C to +85C (Industrial) QFN-36, Lead-free Table 1: Ordering Information For pricing, delivery, and ordering information, please contacts Lumissils analog marketing team at analog Lumissil.com or (408) 969-6600. Lumissil Microsystems www.lumissil.com 1 Rev. F, 08/24/2021 28 CHANNELS LED DRIVER EVALUATION BOARD GUIDE SOFTWARE SUPPORT The steps listed below are an example using the Arduino for external control. JP1 default setting is shorted. If it is set to open, the SDA, SCL and SDB pin are set to high impedance and The Arduino hardware consists of an Atmel microcontroller with a bootloader allowing quick the on-board MCU will be idle. External I2C and SDB signals can be connected to TP4 to control the firmware updates. First download the latest Arduino Integrated Development Environment IDE (1.6.12 or IS31FL3235A LED driver. During external control mode, toggling the MODE button (K1) can switch the power of greater) from www.arduino.cc/en/Main/Software. Also download the Wire.h library from single blue color LED and power of RGB LED. www.arduino.cc/en/reference/wire and verify that pgmspace.h is in the directory program Files(x86)/Arduino/hardware/tools/avr/avr/include/avr /. Then download the latest Arduino IS31FL3235A test firmware (sketch) from the Lumissil website