MON35W42 datasheet(11/60 Pages) SMSC

11 / 60 page

CR[4Ah] bit6-4 can only be used to access

(read/write) temperature sensor 3 registers.

The

first

serial

bus

address,

CR[48h],

uses 3 hardware setting bits. When pin 43 is set

high, pins 47-45 are used to set the I

2C address

for register CR[48h]. The selected address is

00101[pin45][pin46][pin47]. If pin45=1, pin46=1,

pin47=0, the content of CR[48h] is 00101110.

CR[4Ah] is used to set the other two I

addresses.

If CR[4Ah] bit 2-0 is XXX , the

temperature

sensor

serial

address

1001XXXG, in which G is the read/write bit. If

CR[4Ah] bit 6-4 is YYY , the temperature sensor

3 serial address is 1001YYYG, in which G is the

read/write bit.

The first serial bus access timing are shown

as follows:

(a) Serial bus write to internal address register followed by the data byte

FIGURE 2 – SERIAL BUS WRITE TO INTERNAL ADDRESS REGISTER

FOLLOWED BY THE DATA BYTE

Start By

Master

Ack

R/nW

Ack

MON35W42

SCL

SDA

Ack

Stop

Master

SCL

SDA (Continued)

Frame 2

Internal Index Register Byte

(Continued)

Frame 3

Data Byte

Frame 1

Serial Bus Address Byte

MON35W42

MON35W42 Datasheet(PDF) 11 Page - SMSC Corporation

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