PCF8577CT/3,118 View Datasheet(PDF) - NXP Semiconductors.
Part Name
Description
Manufacturer
PCF8577CT/3,118 Datasheet PDF : 33 Pages
| |||
NXP Semiconductors
PCF8577C
LCD direct/duplex driver with I²C-bus interface
8. I2C-bus interface
8.1 Characteristics of the I2C-Bus
The I2C-bus is for 2-way, 2-line communication between different ICs or modules. The two
lines are a Serial DAta line (SDA) and a Serial CLock line (SCL). Both lines must be
connected to a positive supply via a pull-up resistor when connected to the output stages
of a device. Data transfer may be initiated only when the I2C-bus is not busy.
8.1.1 Bit transfer
One data bit is transferred during each clock pulse. The data on the SDA line must remain
stable during the HIGH period of the clock pulse as changes in the data line at this time
are interpreted as control signals.
6'$
6&/
Fig 6. Bit transfer
GDWDOLQH
VWDEOH
GDWDYDOLG
FKDQJH
RIGDWD
DOORZHG
PED
8.1.2 START and STOP conditions
Both data and clock lines remain HIGH when the I2C-bus is not busy. A HIGH-to-LOW
transition of the data line, while the clock is HIGH is defined as the START condition (S). A
LOW-to-HIGH transition of the data line while the clock is HIGH is defined as the STOP
condition (P).
6'$
6&/
6
67$57FRQGLWLRQ
Fig 7. Definition of START and STOP conditions
3
6723FRQGLWLRQ
PED
8.1.3 System configuration
A device generating a message is a ‘transmitter’, a device receiving a message is the
‘receiver’. The device that controls the message is the ‘master’ and the devices which are
controlled by the master are the ‘slaves’.
PCF8577C
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 5 — 10 October 2014
© NXP Semiconductors N.V. 2014. All rights reserved.
9 of 33
Share Link: 