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PCA9550
Datasheet
General description
The PCA9550 LED blinker blinks LEDs in I2C-bus and SMBus applications where it is necessary to limit bus traffic or free up the I2C Master's (MCU, MPU, DSP, chip set, etc.) timer. The uniqueness of this device is the internal oscillator with two programmable blink rates. To blink LEDs using normal I/O expanders like the PCF8574 or PCA9554, the bus master must send repeated commands to turn the LED on and off. This greatly increases the amount of traffic on the I2C-bus and uses up one of the master's timers. The PCA9550 LED blinker instead requires only the initial set-up command to program BLINK RATE 1 and BLINK RATE 2 (i.e., the frequency and duty cycle). From then on, only one command from the bus master is required to turn each individual open-drain output ON, OFF, or to cycle at BLINK RATE 1 or BLINK RATE 2. Maximum output sink current is 25 mA per bit and 50 mA per package.
Any bits not used for controlling the LEDs can be used for General Purpose parallel Input/Output (GPIO) expansion.
The active LOW hardware reset pin (RESET) and Power-On Reset (POR) initializes the registers to their default state, all zeroes, causing the bits to be set HIGH (LED off).
One hardware address pin on the PCA9550 allows two devices to operate on the same bus.
Features
- 2 LED drivers (on, off, flashing at a programmable rate)
- 2 selectable, fully programmable blink rates (frequency and duty cycle) between 0.172 Hz and 44 Hz (5.82 seconds and 0.023 second)
- Input/output not used as LED drivers can be used as regular GPIOs
- Internal oscillator requires no external components
- I2C-bus interface logic compatible with SMBus
- Internal power-on reset
- Noise filter on SCL/SDA inputs
- Active LOW reset input
- 2 open-drain outputs directly drive LEDs to 25 mA
- Controlled edge rates to minimize ground bounce
- No glitch on power-up
- Supports hot insertion
- Low standby current
- Operating power supply voltage range of 2.3 V to 5.5 V
- 0 kHz to 400 kHz clock frequency
- ESD protection exceeds 2000 V HBM per JESD22-A114, 150 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
- Packages offered: SO8, TSSOP8 (MSOP8), HVSON8
Products/packages
| Type number | North American Type number | Ordering code (12NC) | Product status | Package | Packing | Marking | Chemical content | Leadfree conversion date |
|---|---|---|---|---|---|---|---|---|
| PCA9550D | PCA9550D | 9352 728 82112 | Volume production | SOT96-1
(SO8) | Tube | Standard Marking | PCA9550D
| week 5, 2005 |
| PCA9550D | PCA9550D-T | 9352 728 82118 | Volume production | SOT96-1
(SO8) | Tape reel smd | Standard Marking | PCA9550D
| week 5, 2005 |
| PCA9550DP | PCA9550DP-T | 9352 728 81118 | Volume production | SOT505-1
(TSSOP8) | Reel Pack, SMD, 13" | Standard Marking | PCA9550DP
| week 12, 2005 |
| PCA9550TK | 9352 856 67118 | Development | SOT908 | Reel Pack, SMD, 13" | Standard Marking | Not available
|
Pricing/ordering/availability
| Type number | Ordering code(12NC) | Indicative price/unit($) | Region | Distributor | In stock | Inventory date | Buy online | Samples |
|---|---|---|---|---|---|---|---|---|
| PCA9550D | 9352 728 82112 | 0.9600 | NA | AVNET ELECTRONICS MARKETING | 540 | 7/4/2008 | Buy online | not available |
| NA | DIGI-KEY CORPORATION | 219 | 6/29/2008 | Buy online | ||||
| PCA9550D | 9352 728 82118 | 0.9600 | Order samples | |||||
| PCA9550DP | 9352 728 81118 | 0.9600 | NA | DIGI-KEY CORPORATION | 2,500 | 6/29/2008 | Buy online | Order samples |
| NA | DIGI-KEY CORPORATION | 1,280 | 6/29/2008 | Buy online | ||||
| PCA9550TK | 9352 856 67118 | not available |
Applications
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PDA - discretes focus
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Transceiver board
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Main CPU board
Cellular phone - MMS functionality
LCD TV - MMS functionality
Set-top box - MMS functionality
Color mixing for RGBA LEDs
Technical documents
Application Notes
AN10146_02;
I2C 2002-1A Evaluation Board (26-Feb-03)
AN264;
I2C Devices for LED Display Control (22-Jul-02)
Support Documents
75013239;
I 2 C Logic Selection Guide (2005-01-12)
75011212;
I2C 2002-1A Evaluation Board Kit (01-Mar-03)
75012744;
I2C Bus Solutions 2004 (2004-02-01)
philips_i2c_handbook;
I2C Handbook (2004-01-01)
UM10204_3;
I2C-bus specification and user manual (26-Jun-07)
philips_i2c_logic_overview;
Interface Products Business Line Specialty Logic Product Line I2C Logic Family Overview (2004-01-01)
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 | Operating temp.(Cel) | PWMs | # of Bits | I²C-bus(kHz) | Operating voltage(VDC) | Max Sink Current per bit(mA) | # of Addresses | Max Sink Current per package(mA) | Reset input pin |
|---|---|---|---|---|---|---|---|---|---|---|
| PCA9550D | SOT96-1
(SO8) | -40~85 | 2 (40 Hz to 6.4 sec) | 2 | 400 | 2.3~5.5 | 25 | 2 | 50 | yes |
| PCA9550DP | SOT505-1
(TSSOP8) | -40~85 | 2 (40 Hz to 6.4 sec) | 2 | 400 | 2.3~5.5 | 25 | 2 | 50 | yes |
Similar products
PCA9550 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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