PCF8575C

Features:

· Operating supply voltage from 4.5 to 5.5 V · Low standby current consumption of 10 mA maximum · I2C-bus to parallel port expander · 400 kbits/s FAST I2C-bus · Open-drain interrupt output · 16-bit remote I/O port for the I2C-bus · Compatible with most microcontrollers · Latched outputs with high current drive capability for directly driving LEDs · Address by 3 hardware address pins for use of up to 8 devices · SSOP24 package.


Pinout




Specifications

SYMBOL	PARAMETER	MIN.	MAX.	UNIT
VDD	supply voltage	-0.5	+6.5	V
IDD	supply current	-	±100	mA
ISS	supply current	-	±100	mA
VI	input voltage	VSS - 0.5	VDD +0.5	V
II	DC input current	-	±20	mA
IO	DC input current	-	±25	mA
Ptot	total power dissipation	-	400	mW
PO	power dissipation per output	-	100	mW
Tstg	storage temperature	-65	+150
Tamb	operating ambient temperature	-40	+85

Description

PCF8575C is a silicon CMOS circuit. It provides general purpose remote I/O expansion for most microcontroller families via the two-line bidirectional bus (I2C-bus).

PCF8575C consists of a 16-bit quasi-bidirectional port and an I2C-bus interface. The PCF8575C has a low current consumption and includes latched outputs with high current drive capability for directly driving LEDs.PCF8575C 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. This means that the device is an I2C-bus slave transmitter/receiver.

Every data transmission from the PCF8575C must consist of an even number of bytes, the first byte will be referred to as P07 to P00 and the second byte as P17 to P10. The third will be referred to as P07 to P00 and so on.