F71869A
There are four voltage inputs in the F71869A and the voltage divided formula is shown as
follows:
VIN = V+12V
R2
×
R1 + R2
where V+12V is the analog input voltage, for example.
If we choose R1=27K, R2=5.1K, the exact input voltage for V+12v will be 1.907V, which is
within the tolerance. As for application circuit, it can be refer to the figure shown as follows.
150K
150K
3VCC/VSB
(directly connect to the chip)
VIN3.3
VIN (Lower than 2.048V)
(directly connect to the chip)
VIN1(Max2.048V)
Voltage Inputs
VIN(Higher than 2.048V)
R1
R2
8-bit ADC
with
8 mV LSB
VREF
R
10K, 1%
D+
D-
Typical Thermister
Connection
Typical BJT
Connection
2N3906
R
THM
10K, 25 C
Figure 2. Hardware monitor configuration
The F71869A monitors three remote temperature sensors. These sensors can be measured
from -40°C to 127°C. More detail please refer register description.
Table 2. Remote-sensor transistor manufacturers
Manufacturer
Panasonic
Philips
Model Number
2SB0709 2N3906
PMBT3906
5.2.1. Table Range:
Table 3. Display range is from -40°C to 127°C in 2’s complement format.
Temperature
-40°C
Digital Output
1101 1000
1111 1111
-1°C
1°C
0000 0001
0101 1010
90°C
23
Oct., 2011
V0.19P
FINTEK [ FEATURE INTEGRATION TECHNOLOGY INC. ]
