F75393
PIN NO
1
2
3
PIN NAME
VCC
D+
D-
TYPE
PWR
3VCC
3VCC
3VCC
Power Pin
Positive connection to remote temperature sensor (ex: thermal diode anode)
Negative connection to remote temperature sensor(ex: thermal diode
cathode)
4
THERM#
DESCRIPTION
PWR
AIN
AIN
OD
12
3VCC
Active
LOW
output. This pin will be logic low when the temperature exceeds
its limit.
5
6
7
8
GND
ALERT#
SDA
SCL
PWR
OD
12
3VCC
3VCC
3VCC
3VCC
Ground
Active
LOW
output. Used as SMBus alert or Interrupt
Serial bus data
Serial bus clock
IN
ts
/OD
12
IN
t s
6. Functional Description
6.1 General Description
The F75393 is a simple temperature sensor with warning signal output. It includes a local and a remote 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.
6.2 The warning message
Pin4 and pin6 act as warning message when the temperature exceeds it threshold point.
6.3 Access Interface
The F75393 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 F75393 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. F75393 supports 25ms timeout for no activity on the SMBus. This timeout function is programmed at 22h
bit7 and default is disabled. F75393 also supports Alert Response Address (ARA) protocol.
F75393
-3-
May, 2008
V0.16P
FINTEK [ FEATURE INTEGRATION TECHNOLOGY INC. ]
