PCA9673

General description

The PCA9673 provides general purpose remote I/O expansion for most microcontroller families via the two-line bidirectional bus (I²C-bus) and is a part of the Fast-mode Plus family.

The PCA9673 is a drop in upgrade for the PCF8575 providing higher Fast-mode Plus (Fm+) I²C-bus speeds (1 MHz versus 400 kHz) so that the output can support PWM dimming of LEDs, higher I²C-bus drive (30 mA versus 3 mA) so that many more devices can be on the bus without the need for bus buffers, higher total package sink capacity (400 mA versus 100 mA) that supports having all 25 mA LEDs on at the same time and more device addresses (16 versus 8) are available to allow many more devices on the bus without address conflicts.

The difference between the PCA9673 and the PCF8575 is that the A2 address pin is replaced by a RESET input on the PCA9673.

The device consists of a 16-bit quasi-bidirectional port and an I²C-bus interface. The PCA9673 has a low current consumption and includes latched outputs with 25 mA high current drive capability for directly driving LEDs.

It also possesses an interrupt line (INT) which can be connected to the interrupt logic of the microcontroller. By sending an interrupt signal on this line, the remote I/O can inform the microcontroller if there is incoming data on its ports without having to communicate via the I²C-bus.

The internal Power-On Reset (POR), hardware reset pin (RESET) or software reset sequence initializes the I/Os as inputs.

Features

• 1 MHz I²C-bus interface
• Compliant with the I²C-bus Fast and Standard modes
• SDA with 30 mA sink capability for 4000 pF buses
• 2.3 V to 5.5 V operation with 5.5 V tolerant I/Os
• 16-bit remote I/O pins that default to inputs at power-up
• Latched outputs with 25 mA sink capability for directly driving LEDs
• Total package sink capability of 400 mA
• Active LOW open-drain interrupt output
• 16 programmable slave addresses using 2 address pins
• Readable device ID (manufacturer, device type, and revision)
• Low standby current
• -40 Cel to +85 Cel operation
• ESD protection exceeds 2000 V HBM per JESD22-A114, 200 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: SO24, SSOP24, QSOP24, TSSOP24, HVQFN24, DHVQFN24

Products/packages

Quality/reliability/chemical content

Quality and reliability disclaimer

Pricing/ordering/availability

Applications

• LED signs and displays
• Servers
• Industrial control
• Medical equipment
• PLCs
• Cellular telephones
• Gaming machines
• Instrumentation and test measurement

Related applications
Intelligent washing machine
PCI analog/DVB-T stereo TV receiver
LCD TV - MMS functionality
Set-top box - MMS functionality

Block diagrams/pinning

Design support

Application Notes

AN10814; Driving stepper motors using NXP I2C-bus GPIO expanders (2009-09-11)

AN10441; Level shifting techniques in I2C-bus design (2007-06-20)

AN256; PCA9500/PCA9501 provides simple card maintenance and control using I²C-bus (2009-03-23)

Support Documents

75016543; An industry-leading portfolio of cost-effective, power-saving solutions for major home appliances (2008-06-01)

UM10206; I2C Demonstration Board 2005-1 Quick Start Guide (2006-06-13)

UM10204; I2C-bus specification and user manual (2007-06-26)

web; IBIS and HSPICE Model ()

75016535; NXP 4/8/16-bit I²C/SMBus GPIO expanders PCA9536/54/54A/55 (2008-08-01)

UM10267; PCA9698 demonstration board OM6281 (2008-09-26)

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Disclaimers

• General product disclaimer
• Quality and reliability disclaimer