F71869A
5. Function Description
5.1 Power on Strapping Option
The F71869A provides eight pins for power on hardware strapping to select functions. There is
a form to describe how to set the functions you want.
Table1. Power on trap configuration
Pin No.
Symbol
Value
1
0
Description
AMD Timing (Default)
Intel Cougar Point Timing
52
STRAP_TIMING
Power on Fan speed default duty is 40% (PWM)
(Default)
1
121
124
22
FAN40_100
STRAP4E_2E
FANCTL1
0
1
0
Power on Fan speed default duty is 100%(PWM)
Configuration Register I/O port is 4E/4F. (Default)
Configuration Register I/O port is 2E/2F.
FANCTRL1 is PWM mode. Connect a 4.7K
resistor and pull high to 3.3V.
FANCTLR1 is DAC mode. (Default)
FANCTRL2 is PWM mode. Connect a 4.7K
resistor and pull high to 3.3V.
FANCTLR2 is DAC mode. (Default)
FANCTRL3 is PWM mode. Connect a 4.7K
resistor and pull high to 3.3V.
FANCTLR3 is DAC mode. (Default)
Enable 80 Port (Default)
1
0
1
0
1
24
FANCTL2
26
5
FANCTL3
0
1
0
STRAP_DPORT
Disable 80 Port
Default is alarm mode (disabled). Voltage
protection function is enabled via setting the
related register.
Force mode which is always enabled after power
on.
1
0
122
STRAP_PROTECT
5.2 Hardware Monitor
For the 8-bit ADC has the 8mv LSB, the maximum input voltage of the analog pin is 2.048V.
Therefore the voltage under 2.048V (ex: 1.5V) can be directly connected to these analog
inputs. The voltage higher than 2.048V should be reduced by a factor with external resistors
so as to obtain the input range. Only 3VCC/VSB/VBAT is an exception for it is main power of
the F71869A. Therefore 3VCC/VSB/VBAT can directly connect to this chip’s power pin and
need no external resistors. There are two functions in this pin with 3.3V. The first function is
to supply internal analog power of the F71869A and the second function is that voltage with
3.3V is connected to internal serial resistors to monitor the +3.3V voltage. The internal serial
resistors are two 150K ohm, so that the internal reduced voltage is half of +3.3V.
22
Oct., 2011
V0.19P
FINTEK [ FEATURE INTEGRATION TECHNOLOGY INC. ]
