F75383/F75384
PIN NO
PIN NAME
VCC
TYPE
PWR
AIN
PWR
3VCC
3VCC
3VCC
DESCRIPTION
1
2
3
Power Pin
D+
D-
Positive connection to remote temperature sensor (ex: thermal diode anode)
Negative connection to remote temperature sensor(ex: thermal diode
AIN
cathode)
4
THERM#
3VCC
Active LOW output. This pin will be logic low when the temperature exceeds
OD12
its limit.
5
6
7
8
GND
3VCC
3VCC
3VCC
3VCC
Ground
PWR
OD12
ALERT#
SDA
Active LOW output. Used as SMBus alert or Interrupt
Serial bus data
INts/OD12
INts
SCL
Serial bus clock
6. Functional Description
6.1 General Description
The F75383/F75384 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 F75383/F75384 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 F75383/F75384 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. F75383/F75384 supports 25ms timeout for no activity on the SMBus. This timeout function is
programmed at 22h bit7 and default is disabled. F75383/F75384 also supports Alert Response Address(ARA) protocol.
The operation of the protocol is described with details in the following sections.
F75383/F75384
-3-
July, 2007
V0.32P
FINTEK [ FEATURE INTEGRATION TECHNOLOGY INC. ]
