f75377 Feature Integration Technology Inc., f75377 Datasheet - Page 8

• Manufacturer Part Number: f75377
• Description: Monitor With Automatic Speed Control
• Manufacturer: Feature Integration Technology Inc.

1. General Description
2. Features
F75377 is a system hardware monitoring and automatic fan speed controlling IC specific designed for
graphic cards and PC etc. The F75377 can monitor several critical hardware parameters of the system,
including temperatures and fan speeds which are very important for the system to work stably and
properly.
The chip can monitor up to 3 fan tachometer inputs and 9 temperature inputs (6 remotes from external
sensor devices by I2C/SST interface, 2 remotes from external sensor D1+/D2+ and 1 local sensor). The
remote temperature sensor can be performed by transistor 2N3906 and CPU/GPU thermal diode. The
F75377 also supports beta-compensation algorithm (BJT Model) for new generational 45nm CPU.
In fan control machine, the F75377 can provide automatic fan speed control so that the system can
operate at the minimum acoustic noise. This chip supports not only PWM duty mode (PWMOUT) for fan
speed control. The F75377 supports Heceta-like function; the fan speed control can follow one or more
different temperature inputs. Besides 3 sets temperature inputs, also can read temperature from other
devices by I2C, SST and PECI interfaces. The I2C Master supports general temperature sensor device
protocol, AMD TSI protocol and next generational Intel chipset MCTP SMBus protocol. Others, internal
oscillator was built in this chip. Also the users can set up the upper and lower limits (alarm thresholds) of
all monitored parameters and the F75377 can also issue warning messages for system protection when
there is something wrong with monitored items.
Through the BIOS or application software, the users can read all the monitored parameters of system all
the time. And a pop-up warning can be also activated when the monitored item was out of the
proper/pre-setting range. The F75377 is in the green package of 150mil 20-pin SSOP and powered by
3.3V.
Provide 1 on-chip local and 2 remote temperature sensors
Support 6 temperature inputs from external sensor devices (ex: F75395/F75393)
Beta-compensation support for new generational CPU.
Up to 3 fan speed monitoring inputs and 3 automatic fan speed control
Accuracy ±1
Accuracy ±3
o
o
C from +60
C from +60
o
o
C to +100
C to +100
8
o
o
C on remote channel
C on local channel
F75377
March.
V0.12P
, 2008