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P R ODUC T BR IE F ® TM LX24232 - 32 Channel BackLight LED Driver DESCRIPTION KEY FEATURES ♦ White LED or RGB BackLight driver for large size display panels ♦ Up to 32 LED strings with ±1.5% precision current matching ♦ Wide dimming ratio with PWM and LED current amplitude control ♦ 12-bit PWM duty-cycle resolution and 8-bit resolution for LED current setting ♦ LED power supply voltage control ♦ SPI communication interface ♦ Open string, short LED and over-temperature protection for each individual channel ♦ On-chip thermal monitoring Plastic 8x8mm QFN 56 pin RoHS Compliant/Pb free LX24232ILQ -40 to +85°C Note: Available in Tape & Reel. Append the letters ”TR” to the part number. (i.e. LX24232ILQ-TR) TA (°C) Copyright 2011 Rev. 0.1, April 2011 Microsemi LX24232 PACKAGE ORDER INFO W W W. Microsemi .CO M The LX24232 is a 32-channel display backlight LED controller. The device is part of a chipset consisting of the LX24232 and the LX23108A 8channel LED driver. Each controller is capable of controlling up to 32 LED channels, by controlling up to four LX23108A LED drivers. Each driver contains eight FETs and controls up to 4 x 8 LED channels, where each channel is capable of driving a current of up to 200mA. The LX24232 has 32 independent, frame-by-frame controlled PWM output channels; each output channel supports independent duty-cycle and phase delay control. It uses a Vsync input for flexible synchronization schemes, including synchronization to either rising or falling edges, optimal Vsync jitter support, as well as single or multiple PWM cycles per frame support, and loss of Vsync support. The LX24232 consists of an on-chip internal power supply control circuitry that can be used to adjust the voltage level of an external LED power source. This is done by regulating the LED supply voltage to the optimum level, and thus minimizing the system power loss. At the same time, accurate current regulation for each of the 32 LED strings is maintained. The LX24232 includes an on-chip analog to digital converter for drain voltage (VD) measurements, for power supply control, fault detection and protection. The device is configured through the SPI interface which speeds up communication and reduces the number of control signals between the LX24232 and the host system (FPGA, Video Processor, and CPU). The LX24232 supports a daisy chain connection in case more than 32 channels are required and can detect three types of system faults on each of its 32 channels (over-temperature, open LEDs and short LEDs). After detecting the faults the unit takes the required measures to protect the system. The LX24232 is capable of controlling up to 8 LX23108A drivers, in a special configuration where two consecutive channels are connected together for increased current support. Refer to the application note for more details. C O M P ANY C O NF I DE NTI AL LX24232 - 32 Channel BackLight LED Driver ® TM PWM12 PWM11 PWM10 PWM09 PWM08 PWM07 PWM06 PWM05 PWM04 PWM03 PWM02 PWM01 PWM00 PSEL_SIG PS_CTRL 1 56 55 54 53 52 51 50 49 48 47 46 45 44 4342 PWM13 SDI 2 41 PWM14 MOD0 3 40 PWM15 39 FAULT_IN 38 VZAP MOD1 4 CLK 5 SCAN0 6 SCAN1 7 VDD 8 SCAN2 9 SCAN3 10 SCK 11 CS_N 12 SYNC_IN 13 SYNC_OUT W W W. Microsemi .CO M Pin Configuration 37 VREF 36 ATB_P LX24232ILQ 32-CHANNEL LED DRIVER 35 ATB_N 34 VDMEAS 33 VCC 32 PSEL_CLK 31 PWM16 30 PWM17 14 29 PWM18 15 16 17 18 19 20 21 22 23 24 25 26 27 28 PWM19 PWM21 PWM20 PWM23 PWM22 PWM24 PWM26 PWM25 PWM28 PWM27 PWM29 PWM31 PWM30 SDO ABSOLUTE MAXIMUM RATINGS Supply Input Voltage (VCC, VDD) ….………………………………………..……………….… -0.5V to 4.5V All other pins…………………………………………………………….……. -0.5V to VCC+0.3 up to 4.5V Operating Ambient Temperature Range……………………………………….………………. -40 to 85°C Maximum Operating Junction Temperature………………………………………….……………….150°C ESD Protection at all I/O pins……………………………………………….………………… +/- 2KV HBM Storage Temperature Range………………………………………………………….……. -65°C to 150°C Package Peak Temperature for Solder Reflow (40 seconds maximum exposure)….… 260°C (+0/-5°C) Notes: Exceeding these ratings could result in damage to the device. All voltages are with respect to Ground. THERMAL DATA (POWER CONSUMPTION) For support contact: [email protected] or visit our website at www.microsemi.com. Copyright 2011 Rev. 0.1, April 2011 Microsemi LX24232 21°C/W – according to JESD51-7. THERMAL RESISTANCE-JUNCTION TO AMBIENT Junction Temperature Calculation: TJ = TA + (PD x θJA).