Rainbow-electronics MAX6869 Manual de usuario descargar pdf (Pagina 9)

MAX6854–MAX6869

Nanopower µP Supervisory Circuits with

Optional Manual Reset, Watchdog Timer

_______________________________________________________________________________________ 9

MAX6867/MAX6868/MAX6869 Pin Description

MAX6867/

MAX6869

MAX6868

NAME FUNCTION

11WDI

Watchdog Input. If WDI remains high or low for longer than the watchdog timeout

period, the internal watchdog timer expires, and a reset is triggered for the reset

timeout period. The internal watchdog timer clears whenever reset is asserted,

the manual reset is asserted, or WDI sees a rising or falling edge.

22GND Ground

33MR

Active-Low Manual Reset Input. Drive MR low to initiate a reset. The reset output

remains asserted while MR is held low and for the reset timeout period after MR

transitions high. Leave MR unconnected or connect to V

if unused. MR is

internally pulled up to V

through 10kΩ.

4—RESET

Active-Low Open-Drain or Push-Pull Reset Output. RESET transitions from high to

low when V

drops below the selected reset threshold, MR is pulled low, or the

watchdog timer expires. RESET remains low for the reset timeout period after

exceeds the device reset threshold, MR deasserts, or after the watchdog

timer expires. Push-pull RESET outputs are referenced to V

. Open-drain

RESET outputs require an external pullup resistor.

55V

Supply Voltage. Input for V

reset monitor. For noisy systems, bypass V

with

a 0.1µF capacitor to GND.

—4RESET

Active-High Push-Pull Reset Output. RESET transitions from low to high when

drops below the selected reset threshold, MR is pulled low, or the watchdog

timer expires. RESET remains high for the reset timeout period after V

exceeds the device reset threshold, MR deasserts, or after the watchdog timer

expires. RESET is referenced to V

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

MAX6854–MAX6869 1

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Rainbow-electronics MAX6869 Manual de usuario Pagina 9

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