PCF8811USLASH2DASLASH1 datasheet(31/81 Pages) NXP

31 / 81 page

PCF8811_4

Product data sheet

Rev. 04 — 27 June 2008

31 of 81

NXP Semiconductors

PCF8811

80 x 128 pixels matrix LCD driver

11. I2C-bus interface

11.1 Characteristics of the I2C-bus (Hs-mode)

The I2C-bus Hs-mode is for bidirectional, two-line communication between different ICs or

modules with speeds of up to 3.4 MHz. The only difference between Hs-mode slave

devices and F/S-mode slave devices is the speed at which they operate. Because of this

the buffers on the SCLH and SDAH have open-drain outputs. This is the same for I2C-bus

master devices which have an open-drain SDAH output and a combination of an

open-drain, pull-down and current source pull-up circuits on the SCLH output. Only the

current source of one master is enabled at any one time, and only during Hs-mode. Both

lines must be connected to a positive supply via a pull-up resistor.

Data transfer may be initiated only when the bus is not busy.

11.1.1 System conﬁguration

The system conﬁguration is shown in Figure 25.

Deﬁnitions of the I2C-bus terminology:

• transmitter: the device which sends the data to the bus

• receiver: the device which receives the data from the bus

• master: the device which initiates a transfer, generates clock signals and terminates a

transfer

• slave: the device addressed by a master

• multi-master: more than one master can attempt to control the bus at the same time

without corrupting the message

• arbitration: procedure to ensure that, if more than one master simultaneously tries to

control the bus, only one is allowed to do so and the message is not corrupted

• synchronization: procedure to synchronize the clock signals of two or more devices

Fig 24. Read mode serial interface 3-line

001aai351

SCE

SCLK

SDATA

SDO

DB7

D/C

DB6 DB5 DB4

DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0

DB3 DB2

DB1 DB0

D/C

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