(b)
Serial bus write to internal address register only
SCL
SDA
Start By
Master
0
7
8
0
7
8
0
1
0
1
1
0
1
R/nW
Ack
by
MON35W42
D7
D6
D5
D4
D3
D2
D1
D0
Ack
by
MON35W42
Stop by
Master
Frame 1
Serial Bus Address Byte
Frame 2
Internal Index Register Byte
0
FIGURE 3 – SERIAL BUS WRITE TO INTERNAL ADDRESS REGISTER ONLY
(c)
Serial bus read from a register with the internal address register preset to desired location
SCL
SDA
Start By
Master
0
7
8
0
7
8
0
1
0
1
1
0
1
R/nW
Ack
by
MON35W42
D7
D6
D5
D4
D3
D2
D1
D0
Ack
by
Master
Stop by
Master
Frame 1
Serial Bus Address Byte
Frame 2
Internal Index Register Byte
0
FIGURE 4 – SERIAL BUS WRITE TO INTERNAL ADDRESS REGISTER
The serial bus timing of the temperature 2 and 3 is shown as follow:
(a) Typical 2-byte read from preset pointer location (Temp, T
OS
, T
HYST
)
0
SCL
SDA
Start By
Master
7
8
0
...
...
D1
Frame 2
MSB Data Byte
7
8
0
...
...
D1
7
0
1
0
1
1
0
1 R/nW
Ack
by
MON35W42
D7
D0
Ack
by
Master
D7
D0
Ack
by
Master
Stop by
Master
Frame 1
Serial Bus Address Byte
Frame 3
LSB Data Byte
FIGURE 5 – TYPICAL 2-BYTE READ FROM PRESENT POINTER LOCATION
12
SMSC [ SMSC CORPORATION ]
