Data Sheet

ManualsBrandsSunfounder ManualsLCD & DisplayIIC/I2C/TWI Serial 2004/20x4 LCD Module Shield for Arduino Uno/Mega2560

1997 Apr 02 12

Philips Semiconductors Product speciﬁcation

Remote 8-bit I/O expander for I

2

C-bus

PCF8574

handbook, full pagewidth

MBD971

S 0 1 1 1 A2 A1 A0 0 A

start condition

1

P3

R/W acknowledge

from slave

A 0

P3

A P

SDA

SCL

P3

OUTPUT

VOLTAGE

I

OHt

I

OH

P3

PULL-UP

OUTPUT

CURRENT

slave address (PCF8574A)

data to port data to port

12345678

Fig.14 Transient pull-up current I

OHt

while P3 changes from LOW-to-HIGH and back to LOW.