f75385 Feature Integration Technology Inc., f75385 Datasheet - Page 6

• Manufacturer Part Number: f75385
• Description: ?1o C Accuracy Temperature Sensor Ic Datasheet
• Manufacturer: Feature Integration Technology Inc.

6. Functional Description
6.1 General Description
6.2 The warning message
6.3 Access Interface
temperature sensor. Both measured temperature are compared with its high, low and THERM limits which are stored
in the registers. When one or more out-of-limit events occur, the flags in Status Register will be set and that may
cause ALERT output to low. Also, measured temperature exceeding THERM limit may cause THERM output to low.
control of the master device, using two device terminals SCL and SDA. The F75385 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. F75385 supports 25ms timeout for no activity on
the SMBus. This timeout function is programmed at 22h bit7 and default is disabled. F75385 also supports Alert
Response Address (ARA) protocol.
(a)
SCL
SDA
The F75385 is a simple temperature sensor with warning signal output. It includes a local and a remote
Pin4 and pin6 act as warning message when the temperature exceeds it threshold point.
The F75385 can be connected to a compatible 2-wire serial system management bus as a slave device under the
The operation of the protocol is described with details in the following sections.
SMBus write to internal address register followed by the data byte
Start By
Master
0
1
Figure 1. Serial Bus Write to Internal Address Register followed by the Data Byte
0
Serial Bus Address Byte
0
SCL
SDA (Continued)
Frame 1
1
(Continued)
1
0
0
R/W
0
D7
7
-3-
Ack
382
by
8
D6
0
D7
D5
D6
D4
Internal Index Register Byte
D5
D3
Data Byte
Frame 3
Frame 2
D4
D2
D3
D1
D2
7
D0
D1
8
7
D0
Master
Stop
by
Ack
382
by
8
July 2006
V0.21P