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PCA9505 Datasheet, PDF (1/31 Pages) NXP Semiconductors – 40-bit I2C-bus I/O port with RESET, OE and INT | |||
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PCA9505/06
40-bit I2C-bus I/O port with RESET, OE and INT
Rev. 03 â 6 June 2007
Product data sheet
1. General description
The PCA9505/PCA9506 provide 40-bit parallel input/output (I/O) port expansion for
I2C-bus applications organized in 5 banks of 8 I/Os. At 5 V supply voltage, the outputs are
capable of sourcing 10 mA and sinking 15 mA with a total package load of 600 mA to
allow direct driving of 40 LEDs. Any of the 40 I/O ports can be conï¬gured as an input or
output. Output ports are totem-pole and their logic state changes at the Acknowledge
(bank change). The PCA9505 is identical to the PCA9506 except that it includes 100 kâ¦
internal pull-up resistors on all the I/Os. The PCA9506 does not include the internal
pull-ups on the I/Os to reduce power consumption when used as outputs or when the
input is driven by a push-pull driver.
The device can be conï¬gured to have each input port to be masked in order to prevent it
from generating interrupts when its state changes and to have the I/O data logic state to
be inverted when read by the system master.
An open-drain interrupt (INT) output pin allows monitoring of the input pins and is
asserted each time a change occurs in one or several input ports (unless masked).
The Output Enable (OE) pin 3-states any I/O selected as an output and can be used as an
input signal to blink or dim LEDs (PWM with frequency > 80 Hz and change duty cycle).
The internal Power-On Reset (POR) or hardware reset (RESET) pin initializes the 40 I/Os
as inputs. Three address select pins conï¬gure one of 8 slave addresses.
The PCA9506 is available in 56-pin TSSOP and HVQFN packages, while the PCA9505 is
available only in a TSSOP package. They are both speciï¬ed over the â40 °C to +85 °C
industrial temperature range.
2. Features
I Standard mode (100 kHz) and Fast mode (400 kHz) compatible I2C-bus serial
interface
I 2.3 V to 5.5 V operation with 5.5 V tolerant I/Os
I 40 conï¬gurable I/O pins that default to inputs at power-up
I PCA9505 includes 100 k⦠internal pull-up resistors on all the I/Os
I Outputs:
N Totem-pole (10 mA source, 15 mA sink) with controlled edge rate output structure
N Active LOW output enable (OE) input pin 3-states all outputs
N Output state change on Acknowledge
N Open-drain active LOW interrupt (INT) output pin allows monitoring of logic level
change of pins programmed as inputs
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