PCF8566P datasheet(23/48 Pages) NXP

23 / 48 page

PCF8566_7

Product data sheet

Rev. 07 — 25 February 2009

23 of 48

NXP Semiconductors

PCF8566

Universal LCD driver for low multiplex rates

Two displays controlled by PCF8566 can be recognized on the same I2C-bus which

allows:

• Up to 16 PCF8566s on the same I2C-bus for very large LCD applications (see

Section 13)

• The use of two types of LCD multiplex on the same I2C-bus

The I2C-bus protocol is shown in Figure 17. The sequence is initiated with a START

condition (S) from the I2C-bus master which is followed by one of the PCF8566 slave

addresses. All PCF8566s with the same SA0 level acknowledge in parallel to the slave

address. All PCF8566s with the alternative SA0 level ignore the whole I2C-bus transfer.

After acknowledgement, one or more command bytes (m) follow which deﬁne the status of

the addressed PCF8566s. The last command byte is tagged with a cleared most

signiﬁcant bit, the continuation bit C. The command bytes are also acknowledged by all

addressed PCF8566s on the bus.

After the last command byte, a series of display data bytes (n) may follow. These display

bytes are stored in the display RAM at the address speciﬁed by the data pointer and the

subaddress counter. Both data pointer and subaddress counter are automatically updated

and the data is directed to the intended PCF8566 device.

The acknowledgement after each byte is made only by the (A0, A1 and A2) addressed

PCF8566. After the last display byte, the I2C-bus master issues a STOP condition (P).

Fig 16. Slave address structure

Fig 17. I2C-bus protocol

001aai455

011111

slave address

1 byte

R/W

mgg390

011111

0 A C

COMMAND

DISPLAY DATA

slave address

acknowledge by

all addressed

PCF8566s

acknowledge

by A0, A1 and A2

selected

PCF8566 only

≥ 1 byte(s)

n > 0 byte(s)

1 byte

update data pointers

and if necessary,

subaddress counter

R/W

PCF8566P датащи(PDF) 23 Page - NXP Semiconductors

PCF8566P датащи(HTML) 23 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48

датащи скачать

ссылки URL