LED照明驱动器 8-ch I2C Ufm HV OD LED cntrllr with OE
Overview
The PCU9654 is a UFm I²C-bus controlled 8-bit LED driver optimized for voltage switch dimming and blinking 100 mA Red/Green/Blue/Amber RGBA LEDs. Each LED output has its own 8-bit resolution 256 steps fixed frequency individual PWM controller that operates at 97 kHz with a duty cycle that is adjustable from 0 % to 99.6 % to allow the LED to be set to a specific brightness value. An additional 8-bit resolution 256 steps group PWM controller has both a fixed frequency of 190 Hz and an adjustable frequency between 24 Hz to once every 10.73 seconds with a duty cycle that is adjustable from 0 % to 99.6 % that is used to either dim or blink all LEDs with the same value.
Each LED output can be off, on no PWM control, set at its individual PWM controller value or at both individual and group PWM controller values. The PCU9654 operates with a supply voltage range of 2.3 V to 5.5 V and the 100 mA open-drain outputs allow voltages up to 40 V for LED supply.
The PCU9654 is one of the first LED controller devices in a new Ultra Fast-mode UFm family. UFm devices offer higher frequency up to 5 MHz.
The active LOW Output Enable input pin OE blinks all the LED outputs and can be used to externally PWM the outputs, which is useful when multiple devices need to be dimmed or blinked together without using software control.
Software programmable LED Group and three Sub Call I²C-bus addresses allow all or defined groups of PCU9654 devices to respond to a common I²C-bus address, allowing for example, all red LEDs to be turned on or off at the same time, thus minimizing I²C-bus commands. Six hardware address pins allow up to 64 devices on the same bus.
The Software Reset SWRST Call allows the master to perform a reset of the PCU9654 through the I²C-bus, identical to the Power-On Reset POR that initializes the registers to their default state causing the outputs to be set HIGH LED off. This allows an easy and quick way to reconfigure all device registers to the same condition.
MoreLess
## Features
* 8 LED drivers. Each output programmable at:
* Off
* On
* Programmable LED brightness
* Programmable group dimming/blinking mixed with individual LED brightness
* 5 MHz Ultra Fast-mode I²C-bus interface
* 256-step 8-bit linear programmable brightness per LED output varying from fully off default to maximum brightness using a 97 kHz PWM signal
* 256-step group brightness control allows general dimming using a 190 Hz PWM signal from fully off to maximum brightness default
* 256-step group blinking with frequency programmable from 24 Hz to 10.73 s and duty cycle from 0 % to 99.6 %
* Eight open-drain outputs can sink between 0 mA to 100 mA and are tolerant to a maximum off state voltage of 40 V. No input function.
* Output state change programmable on the Acknowledge bit 9, this bit is always set to 1 by UFm I²C-bus master or the STOP Command to update outputs byte-by-byte or all at the same time default to ‘Change on STOP’.
* Active LOW Output Enable OE input pin allows for hardware blinking and dimming of the LEDs when LED driver output state is fully ON LDRx = 01 in LEDOUT0/1 registers
* Six hardware address pins allow 64 PCU9654 devices to be connected to the same UFm I²C-bus and to be individually programmed
* 4 software programmable UFm I²C-bus addresses one LED Group Call address and three LED Sub Call addresses allow groups of devices to be addressed at the same time in any combination for example, one register used for ‘All Call’ so that all the PCU9654s on the I²C-bus can be addressed at the same time and the second register used for three different addresses so that 1⁄3 of all devices on the bus can be addressed at the same time in a group. Software enable and disable for I²C-bus address.
* Software Reset feature SWRST Call allows the device to be reset through the UFm I²C-bus
* 25 MHz internal oscillator requires no external components
* Internal power-on reset
* Noise filter on USDA/USCL inputs
* Glitch free LED outputs on power-up
* Supports hot insertion
* Low standby current
* Operating power supply voltage VDD range of 2.3 V to 5.5 V
* 5.5 V tolerant inputs on non-LED pins
* -40 °C to +85 °C operation
* ESD protection exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101
* Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
* Packages offered: TSSOP24
## Target Applications
* RGB or RGBA LED drivers
* LED status information
* LED displays
* LCD backlights
* Keypad backlights for cellular phones or handheld devices
## Features