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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 | Orderable part number | Ordering code (12NC) | Product status | Package | Packing | Marking | ECCN |
|---|---|---|---|---|---|---|---|
| PCA9550D | PCA9550D,112 | 9352 728 82112 | Volume production | SOT96-1
(SO8) | Tube | Standard Marking | |
| PCA9550D | PCA9550D,118 | 9352 728 82118 | Volume production | SOT96-1
(SO8) | Tape reel smd | Standard Marking | |
| PCA9550DP | PCA9550DP,118 | 9352 728 81118 | Volume production | SOT505-1
(TSSOP8) | Reel Pack, SMD, 13" | Standard Marking | |
| PCA9550TK | PCA9550TK,118 | 9352 856 67118 | Development | SOT908 | Reel Pack, SMD, 13" | Standard Marking |
Quality/reliability/chemical content
| Type number | Orderable part number | Chemical content | RoHS | Leadfree Conversion date | RHF | IRF (FIT) | MTBF (hours) | MSL Lead-free |
|---|---|---|---|---|---|---|---|---|
| PCA9550D | PCA9550D,112 | PCA9550D |
| week 5, 2005 | ||||
| PCA9550D | PCA9550D,118 | PCA9550D |
| week 5, 2005 | ||||
| PCA9550DP | PCA9550DP,118 | PCA9550DP |
| week 12, 2005 | ||||
| PCA9550TK | PCA9550TK,118 | Not available |
| Always Pb-free |
Pricing/ordering/availability
| Type number | Ordering code(12NC) | Orderable part number | Indicative price/unit($) | Region | Distributor | In stock | Order quantity | Inventory date | Buy online | Samples |
|---|---|---|---|---|---|---|---|---|---|---|
| PCA9550D | 9352 728 82112 | PCA9550D,112 | 0.9600 | NA | ARROW ELECTRONICS | 118 | 3/18/2010 | Buy online | not available | |
| NA | DIGI-KEY CORPORATION | 423 | 3/18/2010 | Buy online | ||||||
| NA | AVNET ELECTRONICS MARKETING | 1,575 | 3/18/2010 | Buy online | ||||||
| JAPAN | CHIP ONE STOP | no | 03/19/2010 | Buy online | ||||||
| PCA9550D | 9352 728 82118 | PCA9550D,118 | 0.9600 | NA | ARROW ELECTRONICS | 118 | 3/18/2010 | Buy online | Order samples | |
| JAPAN | CHIP ONE STOP | yes | 03/19/2010 | Buy online | ||||||
| ASIA | WPI | 1,250 | 1 | 03/18/2010 | Buy online | |||||
| PCA9550DP | 9352 728 81118 | PCA9550DP,118 | 0.9600 | NA | ARROW ELECTRONICS | 118 | 3/18/2010 | Buy online | Order samples | |
| NA | DIGI-KEY CORPORATION | 6,493 | 3/18/2010 | Buy online | ||||||
| JAPAN | CHIP ONE STOP | no | 03/19/2010 | Buy online | ||||||
| ASIA | WPI | 2,500 | 2500 | 03/18/2010 | Buy online | |||||
| PCA9550TK | 9352 856 67118 | PCA9550TK,118 | not available |
Applications
Related applications
Intelligent washing machine
Intelligent washing machine
PCI analog/DVB-T stereo TV receiver
Transceiver board
Power amplifier board
Main CPU board
Cellular phone
Set-top box - MMS functionality
Color mixing for RGBA LEDs
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 |
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PCA9550
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