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PDF F75363 Data sheet ( Hoja de datos )
| Número de pieza | F75363 | |
| Descripción | Accuracy Temperature Sensor IC | |
| Fabricantes | Feature Integration Technology | |
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F75363 Datasheet
±1oC Accuracy Temperature Sensor IC with Fan Speed Control
Release Date: July, 2007
Revision: V0.27P
1 page  
F75363
1. General Description
The F75363 is a temperature sensor IC with PWM duty cycle output which is specific designed for graphic
cards etc. An 11-bit analog-to-digital converter (ADC) was built inside F75363. The F75363 can monitor
temperature and fan speed which is important for the system to work stably and properly. This chip provides 1
remote temperature sensor and 1 local temperature sensor. The remote temperature sensor can be performed
by CPU/GPU thermal diode or transistor 2N3906. The users can set up the upper and lower limits (alarm
thresholds) of all monitored parameters and this chip can also issue warning messages for system protection
when there is something wrong with monitored items. As for fan speed control, the F75363 can use PWM duty
cycle output to automatically control fan speed. The fan speed control is related to temperature variation. There
is 8-step lookup table for users to program PWM duty cycle output to control fan speed according to the
temperature variation. The F75363 is in the package of 8-pin SOP and powered by 3.3V.
2. Features
Provide 1 on-chip local and 1 remote temperature sensing
Accuarcy
9 ±1 oC accuarcy on remote channel (+60 oC to +126 oC)
9 ±3 oC accuarcy on local channel(+0 oC to +100 oC)
User selectable multi-function pin for either PWM duty cycle output or THERM# signal output function
User selectable multi-function pin for either ALERT# output or tachometer input function
Automatic fan speed control with user programmable 8-step lookup table
Programmable alert queue and limited and setting points(alert threshold) for monitored items
2 wire SMBus interface and ALERT# output for SMBus alert
3VCC operation and in 8-SOP package
Patented: TWI235231, TWI263788
F75363
-1-
July, 2007
V0.27P
5 Page 
F75363
6.4 Alert# Signal
ALERT#/FANIN (pin 6) can be used as ALERT# output or fan tachometer input by setting Configuration Register (index
03h). When pin 6 is used as ALERT# output, there are three different alert functions can be used. The interrupt methods
that ALERT# pin can act are (1) Comparator mode (2) Interrupt mode (3) Alert Response Address mode.
6.4.1 Comparator mode
When the Comparator Mode bit in Configuration Register (index BFh) is asserted, ALERT# is used as a temperature
comparator. If the triggering conditions occur, ALERT# will go to low and relative alert status will be asserted until those
conditions are no longer present. This mode is not the power-on default state. Note that the triggering conditions do not
include BUSY and OPEN status in Configuration Register (index 02h).
Remote Temperature High Limit
Monitoring Remote Temperature
F75363 ALERT# pin
Remote High Alert Status
6.4.2 Interrupt mode
TIME
The F75363’s ALERT# output can be used as a simple interrupt signal if Comparator Mode bit is not asserted. If the
triggering conditions occur, relative alert status will be asserted and ALERT# will go to low. The F75363 will set the ALERT
Mask bit and relative alert status will be cleared after master’s reading of the Status Register (Index 02h or 18h). The
ALERT Mask bit is set in order to prevent further ALERT# triggering after the end of one temperature conversion if the
triggering conditions are still present. At the end of interrupt service routine, the master has to reset ALERT Mask bit in
configuration register. Note that the triggering conditions do not include BUSY and OPEN status in Configuration Register
(index 02h).
F75363
-7-
July, 2007
V0.27P
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet F75363.PDF ] | |
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