Philips Semiconductors
Product data sheet
NE1619
HECETA4 Temperature and voltage monitor
2004 Oct 05
15
SMBus interface protocol
The NE1619 can communicate over a compatible 2-wire serial
interface SMBus using the two device pins SCL and SDA. The
device employs three standard SMBus protocols: Write Byte, Read
Byte and Receive byte.
Data formats of those protocols are shown below with following notices:
"The SMBus controller initiates data transfer by establishing a start
condition (S) and terminates data transfer by generating a stop
condition (P).
" Data is sent over the serial bus in sequence of 9 clock pulses for
each 8-bit data byte followed by 1-bit status of the device
acknowledgement (A).
" The 7-bit slave address is replaced by the selected address of the
device.
" The command byte is replaced by the selected command of the
device register.
" The receive byte format is used for quickly transfer data from a
reading register which was previously selected by a read.
" During the transition between start and stop conditions, data must
be stable and valid when the SCL is high.
SL01233
SCL
SDA
SCL (continued)
SDA (continued)
SCL
SDA
SCL (continued)
SDA (continued)
SCL
SDA
RESTART
DEVICE ADDRESS
DEVICE REGISTER COMMAND
DATA TO BE WRITTEN TO REGISTER
DATA FROM DEVICE REGISTER
(end)
DEVICE ADDRESS
DEVICE ADDRESS
DEVICE ADDRESS
DATA FROM DEVICE REGISTER
DATA REGISTER COMMAND
STOP
STOP
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
(TO NEXT)
(TO NEXT)
(TO NEXT)
(TO NEXT)
1
2
3
4
5
6
7
8
9
0
1
0
1
1
0
a0
D7
D6
D5
D4
D3
D2
D1
D0
D7
D6
D5
D4
D3
D2
D1
D0
0
1
0
1
1
0
a0
0
1
0
1
1
0
a0
S
W
A
A
A
P
S
W
A
A
P
S
R
A
NA
P
S
R
A
NA
P
D7
D6
D5
D4
D3
D2
D1
D0
D7
D6
D5
D4
D3
D2
D1
D0
0
1
0
1
1
0
a0
D7
D6
D5
D4
D3
D2
D1
D0
Receive Byte Format:
Read Byte Format:
Write Byte Format:
Figure 13. NE1619 SMBus interface protocols
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