Datasheet

MAX7310
2-Wire-Interfaced 8-Bit I/O Port Expander
with Reset
______________________________________________________________________________________ 13
13245 867
SAA
A
0A5A4A3A2A1A0 DATA 1
SLAVE ADDRESS DATA TO PORT
START CONDITION ACKNOWLEDGE
FROM SLAVE
ACKNOWLEDGE
FROM SLAVE
ACKNOWLEDGE
FROM SLAVE
t
PV
DATA 1 VALID
9
10
0
00
COMMAND BYTE
P
DATA OUT
FROM PORT
WRITE TO
PORT
SDA
SCL
0
00
0
R/W
Figure 9. Write to Output Port Register Through Write-Byte Protocol
S1 A A0 A2 A1 A0 DATA 4
SLAVE ADDRESS DATA FROM PORT
START CONDITION
NOTE 1: THIS FIGURE ASSUMES THE COMMAND HAS PREVIOUSLY BEEN PROGRAMMED WITH 0x00.
NOTE 2: TRANSFER OF DATA CAN BE STOPPED AT ANY MOMENT BY A STOP CONDITION. WHEN THIS OCCURS,
DATA PRESENT AT THE LAST ACKNOWLEDGED PHASE IS VALID (OUTPUT MODE). INPUT DATA IS LOST.
R/W
ACKNOWLEDGE
FROM SLAVE
ACKNOWLEDGE
FROM MASTER
STOP
CONDITION
DATA 1
DATA FROM PORT
P
t
PS
t
PH
DATA 4DATA 3DATA 2
DATA INTO
PORT
WRITE FROM
PORT
SDA
NA
NO ACKNOWLEDGE
FROM MASTER
A5 A4
A3
1
Figure 10. Read Input Port Register Through Receive-Byte Protocol