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MCP9509/10
For example, at room temperature, when output
4.6.3
POWER SUPPLY REJECTION
asserts Active-Low and maximum I DD = 50 μA,
V DD = 5.5V, V OL = 0.3V and I OUT = 5 mA (see specifi-
cation table), the self heating due to power dissipation
(T J - T A ) is ~0.4°C.
The MCP9509/10 family of sensors are designed to
prevent false output trigger due to high frequency
power supply or system noise. Figure 4-7 shows
device performance with a high frequency signal added
4.6.2
DRIVING OUTSET WITH A
MICROCONTROLLER I/O PIN
on V DD . The output is not triggered due to the signal
added on V DD . With some applications, it is
recommended to add a bypass capacitor of 0.1 μF to
The OUTSET pin can be controlled using a Microcon-
troller input/output (I/O) pin. I/O levels HIGH and LOW
provide push-pull configuration with Active-High and
1 μF.
Active-Low outputs, respectively. The Open-Drain
output with internal pull-up resistor can be selected by
configuring the I/O pin as a High-Impedance Input. The
Open-Drain output can also be selected by forcing volt-
age level V OSET from a low impedance source. With
this configuration, there maybe some leakage current
due to impedance mismatch, (See Figure 4-2 ).
6
5
4
3
2
1
MCP9509/10 Power Supply Rejection
No False Trigger
V DD = 5V + 400mV AC
V DD = 5V + 400mV SQR
0
10
100
10 00
10 000
10 000 0
10 000 00
10 000 000
Frequency (Hz)
? 2008 Microchip Technology Inc.
FIGURE 4-7:
(PSR).
Power Supply Rejection
DS22114A-page 17
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