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TC3405VPE

16-Bit, Low Cost, Low Power Sigma-Delta A/D Converter

Microchip Technology 

TC3405

3.3 VDD Monitor

The TC3405 RESET output is in high impedance

provided the voltage at VTH is greater than the internal

voltage reference. This reference is approximately the

same value as the voltage appearing at REFOUT. When

VTH is less than the internal reference, RESET is pulled

low. When VTH rises above the internal reference

voltage again, RESET is held low for the reset active

time-out period, t9, before being released. The RESET

output is valid for VDD = 1.3V to 5.5V.

When used to generate a Power-on or Brown-out

Reset, an external resistor network is required to divide

the appropriate VDD threshold down to 1.23V at the

VTH input, (See the Typical Application circuit). For

example, to generate a POR for a VDD at 3V -10%, the

values of R1 and R2 should be 137kΩ and 115kΩ

respectively.

Since RESET is an open drain, it can be wired-OR’ed

with another open drain or external switch if desired.

DS21414B-page 10

© 2002 Microchip Technology Inc.

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