f75395 Feature Integration Technology Inc., f75395 Datasheet - Page 8

• Manufacturer Part Number: f75395
• Description: ?1o C Temperature Sensor With ? Compensation
• Manufacturer: Feature Integration Technology Inc.

6.3 Access Interface
F75395
The F75395 can be connected to a compatible 2-wire serial system management bus as a slave device under the control of the
master device, using two device terminals SCL and SDA. The F75395 supports SMBus protocol of, “Write Byte”, “Read Byte”, both
with or without Packet Error checking (PEC) which is calculated using CRC-8. For detail information about PEC, please check
SMBus 1.1 specification. F75395 supports 25ms timeout for no activity on the SMBus. This timeout function is programmed at 22h
bit7 and default is disabled. F75395 also supports Alert Response Address (ARA) protocol.
The operation of the protocol is described with details in the following sections.
SCL
SDA
(a)
(b)
(c)
(d)
SCL
SDA
SCL
SDA
SMBus write to internal address register followed by the data byte
Serial bus write to internal address register only
Serial bus read from a register with the internal address register prefer to desired location
Alert Response Address
Start By
Master
Start By
Master
Start By
Master
0
1
0
1
Figure 2. Serial Bus Write to Internal Address Register Only
0
1
0
Figure 1. Serial Bus Write to Internal Address Register followed by the Data Byte
Serial Bus Address Byte
0
0
Figure 3. Serial Bus Read from Internal Address Register
0
Serial Bus Address Byte
Serial Bus Address Byte
Frame 1
0
0
1
SCL
SDA (Continued)
Frame 1
Frame 1
1
1
(Continued)
1
1
1
0
0
0
0
0
0
R/W
7
0
R/W
R/W
0
7
7
0
D7
Ack
by
395
8
-4-
Ack
395
by
Ack
by
395
8
8
D6
0
D7
0
D7
0
D7
D5
D6
Internal Index Register Byte
D6
D6
D4
Internal Index Register Byte
Internal Index Register Byte
D5
Frame 2
D5
D5
D3
Data Byte
Frame 3
D4
Frame 2
Frame 2
D4
D4
D2
D3
D3
D3
D1
D2
D2
D2
7
D0
D1
D1
D1
8
7
D0
7
D0
7
D0
Master
Stop
by
Ack
by
395
8
Ack
395
Master
by
Ack
by
8
8
Stop by
Master
F75395
Stop by
Master
May, 2008
V0.15P