MCP9510HT-E datasheet(17/28 Pages) MICROCHIP

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DS22114A-page 17

MCP9509/10

For example, at room temperature, when output

asserts Active-Low and maximum IDD = 50 µA,

VDD =5.5V, VOL = 0.3V and IOUT = 5 mA (see specifi-

cation table), the self heating due to power dissipation

(TJ - TA) is ~0.4°C.

4.6.2

DRIVING OUTSET WITH A

MICROCONTROLLER I/O PIN

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

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 VOSET from a low impedance source. With

this configuration, there maybe some leakage current

due to impedance mismatch, (See Figure 4-2).

4.6.3

POWER SUPPLY REJECTION

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

on VDD. The output is not triggered due to the signal

added

VDD. With some applications, it is

recommended to add a bypass capacitor of 0.1 µF to

1µF.

FIGURE 4-7:

Power Supply Rejection

(PSR).

100

10 00

10 000

10 000 0

10 000 00

10 000 000

Frequency (Hz)

MCP9509/10 Power Supply Rejection

No False Trigger

VDD = 5V + 400mVAC

VDD = 5V + 400mVSQR

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