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PCA9635
Datasheet
General description
The PCA9635 is an I2C-bus controlled 16-bit LED driver optimized for Red/Green/Blue/Amber (RGBA) color mixing applications. 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 pct to 99.6 pct 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 pct to 99.6 pct 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 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 PCA9635 operates with a supply voltage range of 2.3 V to 5.5 V and the 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 PCA9635 is one of the first LED controller devices in a 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).
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 PWM the outputs, which is useful when multiple devices need to be dimmed or blinked together using software control.
Software programmable LED Group and three Sub Call I2C-bus addresses allow all or defined groups of PCA9635 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. Seven hardware address pins allow up to 126 devices on the same bus.
The Software Reset (SWRST) Call allows the master to perform a reset of the PCA9635 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.
Features
- 16 LED drivers. Each output programmable at:
- Off
- On
- Programmable LED brightness
- Programmable group dimming/blinking mixed with individual LED brightness
- 1 MHz Fast-mode Plus compatible I2C-bus interface with 30 mA high drive capability on SDA output for driving high capacitive buses
- 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 pct to 99.6 pct
- Sixteen totem-pole outputs (sink 25 mA and source 10 mA at 5 V) with software programmable open-drain LED outputs selection (default at totem-pole). No input function.
- Output state change programmable on the Acknowledge 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. LED outputs programmable to logic 1, logic 0 or 'high-impedance' (default at power-up) when OE is HIGH, thus allowing hardware blinking and dimming of the LEDs.
- 7 hardware address pins allow 126 PCA9635 devices to be connected to the same I2C-bus
- 4 software programmable 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 PCA9635s 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 I2C-bus
- Up to 126 possible hardware adjustable individual I2C-bus addresses per device so that each device can be programmed individually.
- 25 MHz internal oscillator requires no external components
- Internal power-on reset
- Noise filter on SDA/SCL inputs
- Edge rate control on outputs
- No glitch on power-up
- Supports hot insertion
- Low standby current
- Operating power supply voltage range of 2.3 V to 5.5 V
- 5.5 V tolerant inputs
- -40 Cel to +85 Cel operation
- ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per JESD22-A115 and 1000 V CDM per JESD22-C101
- Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
- Package offered: TSSOP28
Products/packages
| Type number | North American Type number | Ordering code (12NC) | Product status | Package | Packing | Marking | Chemical content | Leadfree conversion date |
|---|---|---|---|---|---|---|---|---|
| PCA9635PW | PCA9635PW | 9352 822 25112 | Volume production | SOT361-1
(TSSOP28) | Tube | Standard Marking | PCA9635PW
| Always Pb-free |
| PCA9635PW | PCA9635PW-T | 9352 822 25118 | Volume production | SOT361-1
(TSSOP28) | Reel Pack, SMD, 13" | Standard Marking | PCA9635PW
| Always Pb-free |
Pricing/ordering/availability
| Type number | Ordering code(12NC) | Indicative price/unit($) | Region | Distributor | In stock | Inventory date | Buy online | Samples |
|---|---|---|---|---|---|---|---|---|
| PCA9635PW | 9352 822 25112 | 1.4800 | NA | AVNET ELECTRONICS MARKETING | 866 | 7/17/2008 | Buy online | not available |
| NA | ARROW ELECTRONICS | 600 | 7/18/2008 | Buy online | ||||
| PCA9635PW | 9352 822 25118 | 1.4800 | NA | DIGI-KEY CORPORATION | 2,500 | 7/18/2008 | Buy online | not available |
| NA | DIGI-KEY CORPORATION | 731 | 7/18/2008 | Buy online |
Applications
- RGB or RGBA LED drivers
- LED status information
- LED displays
- LCD backlights
- Keypad backlights for cellular phones or handheld devices
Related applications
LCD display - discretes focus
PDA - discretes focus
Motherboard components
50-60 Hz CRT integrated DTV (TV210D)
Mid-range integrated DTV (TV810)
Intelligent washing machine
PCI analog/DVB-T stereo TV receiver
Nexperia GSM/GPRS/EDGE VAS system solution (61x0)
Nexperia UMA-enabled GSM/GPRS/EDGE VAS system solution (6100)
Transceiver board
Power amplifier board
Main CPU board
Cellular phone - MMS functionality
Set-top box - MMS functionality
Color mixing for RGBA LEDs
Technical documents
Application Notes
Support Documents
75011212;
I2C 2002-1A Evaluation Board Kit (01-Mar-03)
UM10204_3;
I2C-bus specification and user manual (26-Jun-07)
75010198;
PCA9530/9533/9531/9532 LED Dimmers (25-Sep-02)
75010654;
PCA9550/9551/9552 (01-Dec-01)
75015353;
PCA9633 - Better control of RGBA LEDs (01-Feb-06)
Parametrics/similar products
| Type number | Package | Enable | Operating temp.(Cel) | PWMs | I²C-bus interface | # of Bits | I²C-bus(kHz) | Operating voltage(VDC) | Max Sink Current per bit(mA) | # of Addresses | Max Sink Current per package(mA) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| PCA9635PW | SOT361-1
(TSSOP28) | yes | -40~85 | 17 (16 x 97 kHz dim and 1 x 97 kHz dim or 24 Hz to 10.73 sec blink) | Fast Mode Plus 30 mA SDA outputs for 4000 pF bus | 16 | 1000 | 2.3~5.5 | 25 | 126 | 400 |
Similar products
PCA9635 links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.
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