IS32FL3746B-QWLA3-TR ISSI

IS32FL3746B 184 DOTS MATRIX LED DRIVER WITH 12MHZ SPI February 2020 GENERAL DESCRIPTION FEATURES The IS32FL3746B is a general purpose 18n (n=1~4) Supply voltage range: 2.7V to 5.5V LED Matrix programmed via 12MHz SPI interface. 18 current sinks Each LED can be dimmed individually with 8-bit PWM Support 18n (n=1~4) LED matrix configurations data and 8-bit DC scaling data which allowing 256 Accurate Color Rendition steps of linear PWM dimming and 256 steps of DC - 8-bit PWM current adjustable level. - 8-bit Dot correction Additionally each LED open state can be detected, - 8-bit Global current adjust IS32FL3746B store the open information in Open- SDB rising edge reset SPI module Registers. The Open Registers allowing MCU to read 29kHz PWM frequency out via SPI, inform MCU whether there are LEDs open 12MHz SPI interface or short LEDs. Individual open and short error detect function The IS32FL3746B operates from 2.7V to 5.5V and 180 degree phase delay operation to reduce features a very low shutdown and operational current. power noise IS32FL3746B is available in WFQFN-32 (5mm5mm) Spread spectrum and eTQFP-32 packages. It operates from 2.7V to De-Ghost 5.5V over the temperature range of -40C to +125C. WFQFN-32 (5mm5mm) and eTQFP-32 packages AEC-Q100 Qualified APPLICATIONS Automotive clusters Dashboards Automotive interiors TYPICAL APPLICATION CIRCUIT *Note 3 5V 3.3V 29 19 VCC VIO 1 F 0.1 F 0.1 F SW1 SW2 SW3 SW4 *Note 3 *Note 2 3.3V 28 51 23 SW1 CS18 MOSI 27 20 21 SW2 SCK 26 CS17 22 SW3 Micro CS 25 20 *Note 4 Controller 24 SW4 CS16 MISO 20 IS32FL3746B SDB 32 CS1 100k 0.1 F 1 51 CS2 CS3 20 31 CS2 ISET CS17 17 20 RISET CS1 10k 9 CS18 18 GND 30 Figure 1 Typical Application Circuit: 24 RGBs Lumissil Microsystems www.lumissil.com 1 Rev. A, 01/02/2020 IS32FL3746B TYPICAL APPLICATION CIRCUIT (CONTINUED) *Note 3 5V 3.3V 29 19 VCC VIO 1 F 0.1 F 0.1 F SW1 SW2 SW3 SW4 *Note 3 *Note 2 3.3V 20 28 23 SW1 CS18 MOSI 27 21 SW2 20 SCK 26 CS17 22 SW3 Micro CS 25 20 *Note 4 Controller 24 SW4 CS16 MISO 20 IS32FL3746B SDB 32 CS1 100k 0.1 F 1 CS2 20 CS3 20 31 CS2 ISET CS17 17 20 RISET CS1 10k 9 CS18 18 GND 30 Figure 2 Typical Application Circuit: 72 Mono Color LEDs Figure 3 One MCU Control Multi-IS32FL3746B Note 1: IC and LED should be placed far away from the antenna in order to prevent the EMI. 2 Note 2: These optional resistors are for offloading the thermal dissipation (P=I R) away from the IS32FL3746B. Note 3: The V of SPI bus should be same as VIO pin. VIO pin need to connect to a reference voltage and usually it is same as the VCC of IH MCU. If VCC of MCU is 1.8V, V =1.8V, if VCC of MCU is 5V, V =5V. IO IO Note 4: MISO V =V . OH IO Note 5: Each IS32FL3746B should have independent CS pin. Lumissil Microsystems www.lumissil.com 2 Rev. A, 01/02/2020