IS32FL3237 36-CHANNEL LED DRIVER January 2020 GENERAL DESCRIPTION FEATURES IS32FL3237 is an LED driver with 36 constant current 2.7V to 5.5V VCC supply channels. Each channel can be pulse width modulated 1MHz I2C interface, automatic address increment (PWM) by 16 bits for smooth LED brightness control. function with readout function In addition, each channel has an 8-bit output current Four selectable I2C addresses control register which allows fine tuning the current for Accurate color rendition rich RGB color mixing, e.g., a pure white color LED - Selectable 8-bit/10-bit/12-bit/16-bit PWM application. The maximum output current of each - 8-bit dot correction channel is designed to be 38mA, which can be - 8-bit global current adjust adjusted by one 8-bit global control register. Open/Short detect function Proprietary programmable algorithms are used in 62kHz PWM frequency (8-bit PWM) IS32F3237 to minimize audible noise caused by the Temperature detect function MLCC decoupling capacitor. All registers can be programmed via a high speed I2C (1MHz). EMI/noise reduction technology - Spread spectrum IS32F3237 can be turned off with minimum current - Selectable Phase Delay consumption by either pulling the SDB pin low or by - Selectable 180 degree Clock Phase using the software shutdown feature. -40C to +125C temperature range IS32FL3237 is available in eTQFP-48 package. It eTQFP-48 package operates from 2.7V to 5.5V over the temperature range AEC-Q100 Qualified of -40C to +125C. APPLICATIONS Automotive clusters Dashboards Automotive interiors Ambient lighting Functional lighting Lumissil Microsystems www.lumissil.com 1 Rev. B, 01/02/2020 IS32FL3237 TYPICAL APPLICATION CIRCUIT Figure 1 Typical Application Circuit *Note 1 *Note 1 *Note 3 V =5V CC 41 VLED+=5V 33 VCC 47 40 OUT1 1 F AD 91 0.1 F 48 OUT2 *Note 2 33 1 V OUT3 IH 2k 2k 45 SDA 46 Micro IS32FL3237 SCL Controller 39 SDB 33 36 100k 0.1 F OUT34 91 37 OUT35 44 33 ISET 38 OUT36 RISET 3.3k 4,18 33,42,43 GND GND 19 Figure 2 Typical Application Circuit (V =5V) CC Note 1: V should be same as VCC voltage. LED+ Note 2: V is the high level voltage for IS32FL3237, which is usually same as VCC of Micro Controller, e.g. if VCC of Micro Controller is 3.3V, IH V =3.3V. If V =5V and V is lower than 2.8V, recommend to add a level shift circuit. IH CC IH 2 Note 3: These optional resistors are for offloading the thermal dissipation (P=I R) away from the IS32FL3237. Note 4: The output current is set up to 23mA when R = 3.3k . The maximum global output current can be set by external resistor, R . ISET ISET Please refer to the detail application information in R section. ISET Note 5: The IC and LED should be placed far away from any local antenna in order to prevent EMI contamination. Lumissil Microsystems www.lumissil.com 2 Rev. B, 01/02/2020