ISSI IS31FL3246-TQLS4-TR

IS31FL3246 is comprised of 36 constant current channels, each channel can be pulse width modulated (PWM) by total 8 bits +10 bits (261890 steps) for smooth LED brightness control or color mixing control, 8 bits PWM (LFP) operate at 127Hz (can be disabled), 10 bits (HFP) operate at 32kHz, to minimize the audible noise. The output current of each channel can be set at up to 25mA (Max.), all channels are grouped as G group(OUT1, OUT4, OUT7...), R group (OUT2, OUT5, OUT8...) , B group (OUT3, OUT6, OUT9...) and each group has a 8 bits output current control register which allows fine tuning the current for rich global RGB color mixing. Proprietary programmable technology is used to minimize audible noise caused by MLCC decoupling capacitors. All registers can be programmed via a high speed I2C bus interface (1MHz). The chip can be turned off by pulling the SDB pin low or by using the software shutdown feature to reduce power consumption. The rising edge of the SDB pin will reset the I2C bus module. IS31FL3246 is available in QFN-44 (5mm×5mm) and eTQFP-48. It operates from 2.7V to 5.5V over the temperature range -40°C to +125°C.

• 2.7V to 5.5V supply
• Pin to Pin with IS31FL3236A/IS31FL3237 (QFN-44, 5mm×5mm)
• I2C with register address automatic increment
• Four selectable I2C addresses
• SDB rising edge reset I2C module
• Resistor sets operating current of 25mA (Max.)
• Accurate color rendition
• Three 8-bit global DC current adjust - 8-bit DC current adjust for all green channels - 8-bit DC current adjust for all red channels - 8-bit DC current adjust for all blue channels
• Each channel total 8-bit+10-bit PWM (261890 steps) - 8-bit PWM at 127Hz/254Hz/508Hz (LFP) -10-bit/8-bit PWM at 32kHz (8-bit mode can be at 64kHz or 128kHz, HFP)
• Group dimming to reduce RGB coding
• EMI reduction technology
• Selectable 6 phase delay
• Selectable 180 degree clock phase
• -40°C to +125°C extended industrial temperature range

• Hand-held devices for LED display
• LED in home appliances