PCA9959 Datasheet | NXP Semiconductors

description PCA9959 is a daisy-chain SPI-patible 4-wire serial bus controlled 24-channel constant preset current LED driver, optimized for dimming and blinking 63 m A Red/ Green/Blue/Amber (RGBA) LEDs. Each LED output has its own 6-bit resolution (64 steps) preset current configuration, with an absolute accuracy of ±8 %. PCA9959 supports up to four groups of LED gradation control, with each LED channel assigned to one of the groups. For each group, PCA9959 supports 64-grid brightness control, with the time duration of each grid adjustable from 2.5 μs to 1 ms. Each LED output can be off or on, set at its individual preset current value within each grid. Once gradation control is enabled, PCA9959 automatically changes each LED preset current with the setup from grid0 to grid63; once finished, it can hold grid63 or repeat from grid0 as configured. PCA9959 operates with a supply voltage range of 2.7 V to 5.5 V and the constant preset current sink LED outputs allow up to 5.5 V for the LED supply. This device has built-in open short load and overtemperature detection circuitry. The error information from the corresponding register can be read via the 4-wire serial bus. Additionally, a thermal shutdown feature protects the device when internal junction temperature exceeds the limit allowed for the process. The PCA9959 device is designed to use a 4-wire read/write serial bus with higher data clock frequency (up to 10 MHz). The OE pin can be used as a synchronization signal to switch on/off several PCA9959 devices at the same time. 2 Features and benefits - 24 LED drivers, each output programmable at: - Off - On - 6 bits programmable LED brightness - Programmable LED output delay to reduce EMI and surge currents - Gradation control for all channels - Each channel can assign to one of four gradation control groups - 64 grids for gradation control for each channel - Programmable grid duration time - Four preset current options for each channel during gradation control - 24...