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PCA9531
Datasheet
General description
The PCA9531 is an 8-bit I2C-bus and SMBus I/O expander optimized for dimming LEDs in 256 discrete steps for Red/Green/Blue (RGB) color mixing and back light applications.
The PCA9531 contains an internal oscillator with two user programmable blink rates and duty cycles coupled to the output PWM. The LED brightness is controlled by setting the blink rate high enough (> 100 Hz) that the blinking cannot be seen and then using the duty cycle to vary the amount of time the LED is on and thus the average current through the LED.
The initial setup sequence programs the two blink rates/duty cycles for each individual PWM. From then on, only one command from the bus master is required to turn individual LEDs ON, OFF, BLINK RATE 1 or BLINK RATE 2. Based on the programmed frequency and duty cycle, BLINK RATE 1 and BLINK RATE 2 will cause the LEDs to appear at a different brightness or blink at periods up to 1.69 second. The open-drain outputs directly drive the LEDs with maximum output sink current of 25 mA per bit and 100 mA per package.
To blink LEDs at periods greater than 1.69 second the bus master (MCU, MPU, DSP, chip set, etc.) must send repeated commands to turn the LED on and off as is currently done when using normal I/O expanders like the NXP Semiconductors PCF8574 or PCA9554. Any bits not used for controlling the LEDs can be used for General Purpose parallel Input/Output (GPIO) expansion, which provides a simple solution when additional I/O is needed for ACPI power switches, sensors, push-buttons, alarm monitoring, fans, etc.
The active LOW hardware reset pin (RESET) and Power-On Reset (POR) initializes the registers to their default state causing the bits to be set HIGH (LED off).
Three hardware address pins on the PCA9531 allow eight devices to operate on the same bus.
Features
- Eight LED drivers (on, off, flashing at a programmable rate)
- Two selectable, fully programmable blink rates (frequency and duty cycle) between 0.59 Hz and 152 Hz (1.69 second and 6.58 milliseconds)
- 256 brightness steps
- Input/outputs 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
- Eight open-drain outputs directly drive LEDs to 25 mA
- 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
- 0 Hz 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: SO16, TSSOP16, HVQFN16 (SOT629-1 and SOT758-1 versions)
Products/packages
| Type number | North American Type number | Ordering code (12NC) | Product status | Package | Packing | Marking | Chemical content | Leadfree conversion date |
|---|---|---|---|---|---|---|---|---|
| PCA9531BS | PCA9531BS-T | 9352 747 32118 | Volume production | SOT629-1
(HVQFN16) | Reel Pack, SMD, 13" | Standard Marking | PCA9531BS
| Always Pb-free |
| PCA9531D | PCA9531D | 9352 747 31112 | Volume production | SOT109-1
(SO16) | Tube | Standard Marking | PCA9531D
| week 6, 2004 |
| PCA9531D | PCA9531D-T | 9352 747 31118 | Volume production | SOT109-1
(SO16) | Reel Pack, SMD, 13" | Standard Marking | PCA9531D
| week 6, 2004 |
| PCA9531PW | PCA9531PW | 9352 747 29112 | Volume production | SOT403-1
(TSSOP16) | Tube | Standard Marking | PCA9531PW
| week 48, 2004 |
| PCA9531PW | PCA9531PW-T | 9352 747 29118 | Volume production | SOT403-1
(TSSOP16) | Reel Pack, SMD, 13" | Standard Marking | PCA9531PW
| week 48, 2004 |
Products in the above table are all in production. Some variants are discontinued; click here for information on these variants.
Pricing/ordering/availability
| Type number | Ordering code(12NC) | Indicative price/unit($) | Region | Distributor | In stock | Order quantity | Inventory date | Buy online | Samples |
|---|---|---|---|---|---|---|---|---|---|
| PCA9531BS | 9352 747 32118 | 1.0600 | NA | DIGI-KEY CORPORATION | 6,000 | 1/6/2009 | Buy online | Order samples | |
| NA | DIGI-KEY CORPORATION | 8,692 | 1/6/2009 | Buy online | |||||
| PCA9531D | 9352 747 31112 | 1.0600 | NA | DIGI-KEY CORPORATION | 573 | 1/6/2009 | Buy online | not available | |
| PCA9531D | 9352 747 31118 | 1.2400 | NA | MOUSER ELECTRONICS | 198 | 1/7/2009 | Buy online | Order samples | |
| PCA9531PW | 9352 747 29112 | 1.0600 | NA | ARROW ELECTRONICS | 41 | 1/6/2009 | Buy online | not available | |
| NA | AVNET ELECTRONICS MARKETING | 2,050 | 1/7/2009 | Buy online | |||||
| NA | DIGI-KEY CORPORATION | 1,084 | 1/6/2009 | Buy online | |||||
| PCA9531PW | 9352 747 29118 | 1.1700 | ASIA | SACL - Hong Kong/China | yes | 2500 | 01/08/2009 | Buy online | Order samples |
| NA | AVNET ELECTRONICS MARKETING | 2,500 | 1/7/2009 | Buy online | |||||
| NA | MOUSER ELECTRONICS | 200 | 1/7/2009 | Buy online |
Applications
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Transceiver board
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Cellular phone - MMS functionality
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Color mixing for RGBA LEDs
Design support
Application Notes
AN10148_4;
PCA9564 - I2C-bus controller (22-Nov-04)AN10149_2;
PCA9564 Evaluation Board (19-Aug-04)AN10315_1;
LED dimmer demoboard (11-Jan-05)
Support Documents
75016543;
An industry-leading portfolio of cost-effective, power-saving solutions for major home appliances (2008-06-01)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)75013487;
LED dimmer demo board (2004-11-02)75016189;
NXP I (2008-06-01)75015692;
NXP LED dimmer demonstration board OM6279 (2006-11-01)75015963;
NXP evaluation kit for PCA9564 (2007-05-01)75010198;
PCA9530/9533/9531/9532 LED Dimmers (25-Sep-02)75010654;
PCA9550/9551/9552 (01-Dec-01)75013485;
PCA9564 evaluation kit (2004-10-01)75015353;
PCA9633 - Better control of RGBA LEDs (01-Feb-06)UM10317_1;
PCA9633 demonstration board OM6282 (15-Dec-08)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 |
|---|---|---|---|---|---|---|---|---|---|---|
| PCA9531BS | SOT629-1
(HVQFN16) | -40~85 | 2 (160 Hz to 1.6 sec) | 8 | 400 | 2.3~5.5 | 25 | 8 | 100 | yes |
| PCA9531D | SOT109-1
(SO16) | -40~85 | 2 (160 Hz to 1.6 sec) | 8 | 400 | 2.3~5.5 | 25 | 8 | 100 | yes |
| PCA9531PW | SOT403-1
(TSSOP16) | -40~85 | 2 (160 Hz to 1.6 sec) | 8 | 400 | 2.3~5.5 | 25 | 8 | 100 | yes |
Similar products
PCA9531
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