TC646
+5V
+12V
(RESET)
(Optional)
Open-Drain
I/O0
Outputs
R
1
110 kΩ
I/O1
(MSB)
R
2
240 kΩ
CMOS
I/O2
Outputs
R
3
360 kΩ
I/O3
(LSB)
+5V
1
V
IN
Fan
+ C
B
1
µF
R
9
800Ω
+5V
R10
10 kΩ
0.1
µF
V
DD
8
Analog or Digital
Temperature
Data from one or
more Sensors
C
B
.01
µF
+
R
7
R
4
33 kΩ
18 k
Ω
+5V
R
8
18 kΩ
2
C
F
V
OUT
7
2N2222A
1
µF
3
C
B
.01
µF
TC646
V
AS
FAULT
6
CMOS
Microcontroller
R
5
1.5 kΩ
+5V
R
6
1 kΩ
4
GND
SENSE
5
R11
2.2Ω
GND
INT
FIGURE 5-10:
TC646
as a Microcontroller Peripheral.
V
RELEASE
vs. Temperature
1.0
V
DD
= 5.5V
0.9
V
DD
= 5.0V
0.8
VRELEASE (V)
0.7
V
DD
= 4.0V
0.6
V
DD
= 3.0V
0.5
0.4
0˚C
25˚C
TEMPERATURE
85˚C
FIGURE 5-11:
V
RELEASE
vs. Temperature.
2002 Microchip Technology Inc.
DS21446C-page 17