PCA9670
Remote 8-bit I/O expander for Fm+ I2C-bus with reset
Rev. 02 — 17 July 2007
Product data sheet
1. General description
The PCA9670 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 PCA9670 is a drop-in upgrade for the PCF8574 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
(200 mA versus 100 mA) that supports having all 25 mA LEDs on at the same time and
more device addresses (64 versus 8) are available to allow many more devices on the bus
without address conflicts.
The difference between the PCA9670 and the PCF8574 is that the interrupt output on the
PCF8574 is replaced by a RESET input on the PCA9670.
The devices consist of an 8-bit quasi-bidirectional port and an I2C-bus interface. The
PCA9670 have low current consumption and include latched outputs with 25 mA high
current drive capability for directly driving LEDs.
The internal Power-On Reset (POR), hardware reset pin (RESET), or software reset
sequence initializes the I/Os as inputs.
2. Features
I 1 MHz I2C-bus interface
I Compliant with the I2C-bus Fast and Standard modes
I SDA with 30 mA sink capability for 4000 pF buses
I 2.3 V to 5.5 V operation with 5.5 V tolerant I/Os
I 8-bit remote I/O pins that default to inputs at power-up
I Latched outputs with 25 mA sink capability for directly driving LEDs
I Total package sink capability of 200 mA
I Active LOW reset input
I 64 programmable slave addresses using 3 address pins
I Readable device ID (manufacturer, device type, and revision)
I Low standby current
I −40 °C to +85 °C operation
I ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per
JESD22-A115, and 1000 V CDM per JESD22-C101
I Latch-up testing is done to JEDEC standard JESD78 which exceeds 100 mA
I Packages offered: SO16, TSSOP16, HVQFN16