TC52 datasheet(4/10 Pages) MICROCHIP

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TC52

DS21430B-page 4

 2002 Microchip Technology Inc.

4.0

APPLICATIONS INFORMATION

Pin 2 (VIN1) acts as both the input to Voltage Detector

#1, as well as the power supply input for the chip. As

such, always assign VIN1 to monitor voltages between

1.5V and 10V. Failure to do this will result in unreliable

detector operation due to an out-of-tolerance supply

voltage. In high noise environments, it may be

necessary to install a small input bypass capacitor

(0.01

µF to 0.1µF) from VIN1 to ground to minimize on-

chip power supply noise.

4.1

Battery and Main Supply Monitor

The circuit shown in Figure 4-1 provides both a

processor supply monitor/reset function, as well as a

low

battery

detect

function.

shown,

the

TC52N3330ECT (N-Channel outputs) uses Detector 2

to monitor the system power supply rail. When the

power supply is 10% below its nominal output voltage

rating, the VOUT2 output is driven and held low. When

the power supply voltage is above 3.0V nominal, VOUT2

is driven to an open circuit and the combination of R1

and C1 provides a reset time out delay. Detector 1

monitors the voltage on the main supply battery. A low

battery condition is indicated when the battery voltage

falls to 3.3V, at which time the main processor is

interrupted to initiate a warning or system shutdown.

FIGURE 4-1:

SUPPLY MONITOR AND PROCESSOR SUPERVISOR

TC105

Step Down

DC/DC

Converter

Battery

VIN2

VOUT2

GND

TC52N3330ECT

VIN1

VOUT1

RESET

Processor

INT

System

3.3V

+3.3V

47K

+ C

µF

–

+3.3V

–

47K

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