f75373 Feature Integration Technology Inc., f75373 Datasheet - Page 12

• Manufacturer Part Number: f75373
• Description: Fintek Hardware Monitor Ic Datasheet
• Manufacturer: Feature Integration Technology Inc.

connected by a serial resistor with 10K Ohm, then connect to VREF (pin13).
5.3.2 Over Temperature Signal (OVT#)
The F75373S can provide two external thermal sensors to detect temperature. When monitored temperature exceeds the
over-temperature threshold value, OVT# will be asserted until the temperature goes below the hysteresis temperature.
5.4 Fan
5.4.1 Fan speed count
Inputs are provided by the signals from fans equipped with tachometer outputs. The level of these signals should be set to TTL
level, and maximum input voltage cannot be over VCC. If the input signals from the tachometer outputs are over the VCC, the
external trimming circuit should be added to reduce the voltage to obtain the input specification. The normal circuit and
trimming circuits are shown as follows:
Fintek
Figure 5-5 Fan with Tach Pull-Up to +12V, or Totern-Pole
FAN Out
+12V
GND
+12V
Output and Register Attenuator
Pull-up resister
4.7K Ohms
22K~30K
OVT#
T
HYST
To
Fan Input
10K
FANIN 1
F75373S
Figure 5-4
7
Connector
Feature Integration Technology Inc.
FAN
Figure 5-6 Fan with Tach Pull-Up to +12V, or
FAN Out
+12V
GND
+12V
Totem-Pole Putput and Zener Clamp
Pull-up resister < 1K
or totem-pole output
3.3V Zener
> 1K
Fan Input
F75373
FANIN 1
F75373S
V0.25P