參數(shù)資料
型號(hào)： 935287058118
廠(chǎng)商： NXP SEMICONDUCTORS
元件分類(lèi)： 顯示驅(qū)動(dòng)器
英文描述： LED DISPLAY DRIVER, PQCC28
封裝： 6 X 6 MM, 0.85 MM HIGHT, PLASTIC, MO-220, SOT788-1, HVQFN-28
文件頁(yè)數(shù)： 47/54頁(yè)
文件大小： 410K
代理商： 935287058118
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The PCA9685 is an I2C-bus controlled 16-channel LED controller optimized for LCD Red/Green/Blue/Amber (RGBA) color backlighting
applications. Each LED output has its own 12-bit resolution (4096 steps) fixed frequency individual PWM controller that operates at a programmable frequency from a typical of 40 Hz to
1000 Hz with a duty cycle that is adjustable from 0 pct to 100 pct to allow the LED to be set to a specific brightness value. All outputs are set to the same PWM frequency.
Each LED output can be off or on (no PWM control), or set at its individual PWM controller value. The LED output driver is programmed to be either open-drain with a 25 mA current sink
capability at 5 V or totem pole with a 25 mA sink, 10 mA source capability at 5 V. The PCA9685 operates with a supply voltage range of 2.3 V to 5.5 V and the inputs and outputs are 5.5 V
tolerant. LEDs can be directly connected to the LED output (up to 25 mA, 5.5 V) or controlled with external drivers and a minimum amount of discrete components for larger current or
higher voltage LEDs.
The PCA9685 is in the new Fast-mode Plus (Fm+) family. Fm+ devices offer higher frequency (up to 1 MHz) and more densely populated bus operation (up to 4000 pF).
Although the PCA9635 and PCA9685 have many similar features, the PCA9685 has some unique features that make it more suitable for applications such as LCD backlighting and
Ambilight:
The PCA9685 allows staggered LED output on and off times to minimize current surges. The on and off time delay is independently programmable for each of the 16 channels. This
feature is not available in PCA9635.
The PCA9685 has 4096 steps (12-bit PWM) of individual LED brightness control. The PCA9635 has only 256 steps (8-bit PWM).
When multiple LED controllers are incorporated in a system, the PWM pulse widths between multiple devices may differ if PCA9635s are used. The PCA9685 has a programmable
prescaler to adjust the PWM pulse widths of multiple devices.
The PCA9685 has an external clock input pin that will accept user-supplied clock (50 MHz max.) in place of the internal 25 MHz oscillator. This feature allows synchronization of multiple
devices. The PCA9635 does not have external clock input feature.
Like the PCA9635, PCA9685 also has a built-in oscillator for the PWM control. However, the frequency used for PWM control in the PCA9685 is adjustable from about 40 Hz to 1000 Hz
as compared to the typical 97.6 kHz frequency of the PCA9635. This allows the use of PCA9685 with external power supply controllers. All bits are set at the same frequency.
The Power-On Reset (POR) default state of LEDn output pins is LOW in the case of PCA9685. It is HIGH for PCA9635.
The active LOW Output Enable input pin (OE) allows asynchronous control of the LED outputs and can be used to set all the outputs to a defined I2C-bus programmable logic state. The
OE can also be used to externally 'pulse width modulate' the outputs, which is useful when multiple devices need to be dimmed or blinked together using software control.
Software programmable LED All Call and three Sub Call I2C-bus addresses allow all or defined groups of PCA9685 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 or marquee chasing effect, thus minimizing I2C-bus commands. Six hardware address pins allow up to 62 devices on the
same bus.
The Software Reset (SWRST) General Call allows the master to perform a reset of the PCA9685 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 LOW. This allows an easy and quick way to reconfigure all device registers to the same condition via software.
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Datasheet
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PCA9685
(Product Specification)
16-Jul-09, 50 Pages, 240kB
PCA9685 - 16-channel, 12-bit PWM Fm+ I2C-bus LED controller
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PCA9685 - 16-channel, 12-bit PWM Fm+ I2C-bus LED controller from NXP Semiconductors
03-Nov-2009
http://www.nxp.com/
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