X98021 datasheet(28/29 Pages) RENESAS

28 / 29 page

X98021

FN8219 Rev 3.00

Page 28 of 29

March 8, 2006

X98021 Serial Bus Address Write

This is the 7 bit address of the X98021 on the 2 wire bus. The

address is 0x4C if pin 48 is low, 0x4D if pin 48 is high. R/W = 0,

indicating next transaction will be a write.

(pin 48)

R/W

X98021 Register Address Write

This sets the initial address of the X98021’s configuration

X98021 Serial Bus Address

START Command

Signals the beginning of serial I/O

X98021 Serial Bus Address Write

This is the 7 bit address of the X98021 on the 2 wire bus. The

address is 0x4C if pin 48 is low, 0x4D if pin 48 is high. R/W = 1,

indicating next transaction(s) will be a read.

X98021 Register Data Read(s)

This is the data read from the X98021’s configuration register.

Note: The X98021’s Configuration Register’s address pointer auto

increments after each data read: repeat this step to read multiple

sequential bytes of data from the Configuration Register.

(pin 48)

R/W

X98021 Serial Bus Address

START Command

STOP Command

(Repeat if desired)

Ends the previous transaction and starts a new one

Signals the ending of serial I/O

Data

Read*

SDA Bus

Signals from

the X98021

Signals from

the Host

Address

Serial Bus

Address

aaaaaaaa

dddddddd

100110 A 0

* The data read step may be repeated to read

from the X98021’s Configuration Register

sequentially, beginning at the Register

Address written in the two steps previous.

Serial Bus

Address

100110 A 1

FIGURE 16. CONFIGURATION REGISTER READ

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