PCA9685: 16-channel, 12-bit PWM Fm+ I²C-bus LED controller
The PCA9685 is an I²C-bus controlled 16-channel LED controller optimized for
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 24 Hz to 1526 Hz with a duty cycle that is
adjustable from 0 % to 100 % 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 or LED
backlighting and Ambilight:
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.
Outline 3d SOT361-1
Data Sheets (1)
Application Notes (1)
Users Guides (5)
Brochures (3)
Selector Guides (1)
Package Information (2)
Packing (2)
Supporting Information (1)
IBIS Model
Ordering Information
| Product | Status | Package version | Operating Temperature (Cel) | PWMs | I2C-bus interface | I2C-bus (kHz) | Operating voltage (VDC) | Max Sink Current per bit (mA) | No of Addresses | Max Sink Current, per package (mA) | Number of bits |
|---|
| PCA9685PW | Active | SOT361-1 | -40~85 | 16 x 1 kHz adjustable freq | Fast Mode Plus 30 mA SDA outputs for 4000 pF bus | 1000 | 2.3~5.5 | 25 | 126 | 400 | 16 |
| PCA9685BS | Active | SOT788-1 | -40~85 | 16 x 1 kHz adjustable freq | Fast Mode Plus 30 mA SDA outputs for 4000 pF bus | 1000 | 2.3~5.5 | 25 | 126 | 400 | 16 |
Package Information
| Product ID | Package Description | Outline Version | Reflow/Wave Soldering | Packing | Product Status | Part NumberOrdering code(12NC) | Marking | Chemical Content | RoHS / Pb Free / RHF | LeadFree Conversion Date | EFR | IFR(FIT) | MTBF(hour) | MSL | MSL LF |
|---|
| PCA9685BS |  | SOT788-1 | | Reel 13" Q1/T1 | Active | PCA9685BS,118
(9352 870 58118) | P9685 | PCA9685BS |    | Always Pb-free | 0.0 | 2.0 | 5E8 | 1 | 1 |
| PCA9685PW | | SOT361-1 | SSOP-TSSOP-VSO-WAVE | Reel 13" Q1/T1 | Active | PCA9685PW,118
(9352 851 29118) | PCA9685PW | PCA9685PW | | Always Pb-free | 0.0 | 2.0 | 5E8 | 1 | 1 |
| Bulk Pack | Active | PCA9685PW,112
(9352 851 29112) | PCA9685PW | PCA9685PW | | Always Pb-free | 0.0 | 2.0 | 5E8 | 1 | 1 |
| PCA9685PW/Q900 | | SOT361-1 | SSOP-TSSOP-VSO-WAVE | Reel 13" Q1/T1 | Active | PCA9685PW/Q900,118
(9352 898 02118) | PCA9685PW | PCA9685PW/Q900 | | Always Pb-free | 0.0 | 2.0 | 5E8 | 1 | 1 |
