PCA9550

2-bit I2C-bus LED driver with programmable blink rates


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Product 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
All information on this product information page is subject to the subsequent disclaimers:
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Show functional diagram

Block diagram: PCA9550D, PCA9550DP, PCA9550TK
Block diagram: PCA9550D, PCA9550DP, PCA9550TK

Products / Packages

Type numberOrderable part numberOrdering code (12NC)Product statusPackagePackingMarkingECCN
PCA9550DPCA9550D,1129352 728 82112Volume productionSOT96-1
(SO8) 		TubeStandard Marking
PCA9550DPCA9550D,1189352 728 82118Volume productionSOT96-1
(SO8) 		Tape reel smdStandard Marking
PCA9550DPPCA9550DP,1189352 728 81118Volume productionSOT505-1
(TSSOP) 		Reel Pack, SMD, 13"Standard Marking

The variants in the table below are discontinued. See the table Discontinuation information at the bottom of this page for more information.

Type numberOrderable part numberOrdering code (12NC)Product statusPackagePackingMarkingECCN
PCA9550TKPCA9550TK,1189352 856 67118Withdrawn
Replacement product		Standard Marking

Discontinuation information

Type numberOrdering code (12NC)Last-time buy dateLast-time delivery dateReplacement productDN NoticeStatusComments
PCA9550TK935285667118DN

Parametrics of this product

Type numberPackageReset input pinMax Sink Current
per package(mA)		# of BitsMax Sink Current per bit(mA)Operating voltage(VDC)I²C-bus(kHz)Operating
temp.(Cel)		# of AddressesPWMs
PCA9550DSOT96-1
(SO8)		yes502252.3~5.5400-40~8522 (40 Hz to 6.4 sec)
PCA9550DPSOT505-1
(TSSOP)		yes502252.3~5.5400-40~8522 (40 Hz to 6.4 sec)

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHSLeadfree conversion dateRHFIFR (FIT)MTBF (hours)MSLMSL LF
PCA9550DPCA9550D,112PCA9550Dweek 5, 200511
PCA9550DPCA9550D,118PCA9550Dweek 5, 200511
PCA9550DPPCA9550DP,118PCA9550DPweek 12, 200511

The variants in the table below are discontinued. See the table Discontinuation information at the bottom of this page for more information.

Type numberOrderable part numberChemical contentRoHSLeadfree conversion dateRHFIFR (FIT)MTBF (hours)MSLMSL LF
PCA9550TKPCA9550TK,118Always Pb-free11
Quality and reliability disclaimer

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Discontinuation information

Type numberOrdering code (12NC)Last-time buy dateLast-time delivery dateReplacement productDN NoticeStatusComments
PCA9550TK935285667118DN

Documentation for this product

Ordering & availability

Type numberOrdering code(12NC)Orderable part numberRegionDistributorIn stockOrder quantityInventory dateBuy onlineSamples
PCA9550D9352 728 82112PCA9550D,112NAFUTURE ELECTRONICS2,0002/6/2012Buy onlinenot available
   NAARROW ELECTRONICS1,9952/6/2012Buy online 
   NADIGI-KEY CORPORATION1,0832/7/2012Buy online 
   NAAVNET ELECTRONICS MARKETING4392/7/2012Buy online 
   JAPANCHIP ONE STOPno02/08/2012Buy online 
PCA9550D9352 728 82118PCA9550D,118ASIAWPI10,000250002/07/2012Buy online 
   NAMOUSER ELECTRONICS4152/7/2012Buy online 
   NAMOUSER ELECTRONICS4152/7/2012Buy online 
   NAAVNET ELECTRONICS MARKETING2002/7/2012Buy online 
   JAPANCHIP ONE STOPyes02/08/2012Buy online 
PCA9550DP9352 728 81118PCA9550DP,118NADIGI-KEY CORPORATION14,9002/7/2012Buy online 
   NAAVNET ELECTRONICS MARKETING5,0012/7/2012Buy online 
   NAARROW ELECTRONICS5,0002/6/2012Buy online 
   NAFUTURE ELECTRONICS2,5002/6/2012Buy online 
   NAMOUSER ELECTRONICS1,3112/7/2012Buy online 
   NAMOUSER ELECTRONICS1,3112/7/2012Buy online 
   JAPANCHIP ONE STOPno02/08/2012Buy online 

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