The PCA9552 LED blinker blinks LEDs in I2C-bus and SMBus applications where it is necessary to limit bus traffic or free up the I2C-bus 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 PCA9552 LED blinker instead requires only the initial setup command to program BLINK RATE 1 and BLINK RATE 2 (that is, the frequency and duty cycle) for each individual output. 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 200 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).
Three hardware address pins on the PCA9552 allow eight devices to operate on the same bus.
| Type number | Orderable part number | Ordering code (12NC) | Product status | Package | Packing | Marking | ECCN |
|---|---|---|---|---|---|---|---|
| PCA9552BS | PCA9552BS,118 | 9352 723 96118 | Volume production | SOT616-1
(HVQFN24) | Reel Pack, SMD, 13" | Standard Marking | |
| PCA9552D | PCA9552D,112 | 9352 723 95112 | Volume production | SOT137 | Tube | Standard Marking | |
| PCA9552D | PCA9552D,118 | 9352 723 95118 | Volume production | SOT137 | Reel Pack, SMD, 13" | Standard Marking | |
| PCA9552PW | PCA9552PW,112 | 9352 723 94112 | Volume production | SOT355-1
(TSSOP24) | Tube | Standard Marking | |
| PCA9552PW | PCA9552PW,118 | 9352 723 94118 | Volume production | SOT355-1
(TSSOP24) | Reel Pack, SMD, 13" | Standard Marking |
| Type number | Orderable part number | Chemical content | RoHS | Leadfree Conversion date | RHF | IRF (FIT) | MTBF (hours) | MSL |
|---|---|---|---|---|---|---|---|---|
| PCA9552BS | PCA9552BS,118 | PCA9552BS |
| Always Pb-free | ||||
| PCA9552D | PCA9552D,112 | PCA9552D |
| week 5, 2005 | ||||
| PCA9552D | PCA9552D,118 | PCA9552D |
| week 5, 2005 | ||||
| PCA9552PW | PCA9552PW,112 | PCA9552PW |
| week 12, 2005 | ||||
| PCA9552PW | PCA9552PW,118 | PCA9552PW |
| week 12, 2005 |
| Type number | Ordering code(12NC) | Orderable part number | Indicative price/unit($) | Region | Distributor | In stock | Order quantity | Inventory date | Buy online | Samples |
|---|---|---|---|---|---|---|---|---|---|---|
| PCA9552BS | 9352 723 96118 | PCA9552BS,118 | 1.5200 | NA | DIGI-KEY CORPORATION | 14,799 | 11/7/2009 | Buy online | Order samples | |
| NA | MOUSER ELECTRONICS | 2,801 | 11/7/2009 | Buy online | ||||||
| NA | FUTURE ELECTRONICS | 100 | 11/7/2009 | Buy online | ||||||
| PCA9552D | 9352 723 95112 | PCA9552D,112 | 1.5200 | NA | ARROW ELECTRONICS | 238 | 11/6/2009 | Buy online | not available | |
| NA | DIGI-KEY CORPORATION | 1,126 | 11/7/2009 | Buy online | ||||||
| NA | FUTURE ELECTRONICS | 145 | 11/7/2009 | Buy online | ||||||
| NA | AVNET ELECTRONICS MARKETING | 1,033 | 11/7/2009 | Buy online | ||||||
| PCA9552D | 9352 723 95118 | PCA9552D,118 | 1.5200 | NA | MOUSER ELECTRONICS | 789 | 11/7/2009 | Buy online | not available | |
| PCA9552PW | 9352 723 94112 | PCA9552PW,112 | 1.5200 | NA | DIGI-KEY CORPORATION | 1,686 | 11/7/2009 | Buy online | not available | |
| NA | AVNET ELECTRONICS MARKETING | 1,158 | 11/7/2009 | Buy online | ||||||
| PCA9552PW | 9352 723 94118 | PCA9552PW,118 | 1.5200 | ASIA | SAC - Taiwan | yes | 2500 | 11/08/2009 | Buy online | Order samples |
| ASIA | WPI | 2,500 | 2500 | 11/07/2009 | Buy online | |||||
| NA | MOUSER ELECTRONICS | 801 | 11/7/2009 | Buy online |
Related applications
Intelligent washing machine
Intelligent washing machine
PCI analog/DVB-T stereo TV receiver
Transceiver board
Power amplifier board
Main CPU board
Set-top box - MMS functionality
Color mixing for RGBA LEDs
Application Notes
Support Documents
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| PCA9552BS | SOT616-1
(HVQFN24) | -40~85 | 2 (40 Hz to 6.4 sec) | 16 | 400 | 2.3~5.5 | 25 | 8 | 200 | yes |
| PCA9552D | SOT137
| -40~85 | 2 (40 Hz to 6.4 sec) | 16 | 400 | 2.3~5.5 | 25 | 8 | 200 | yes |
| PCA9552PW | SOT355-1
(TSSOP24) | -40~85 | 2 (40 Hz to 6.4 sec) | 16 | 400 | 2.3~5.5 | 25 | 8 | 200 | yes |
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