5

IMP809, IMP8

Bi-directional Reset Pin Interfacing

The IMP809/810 can interface with µP/µC bi-directional reset

pins by connecting a 4.7k

Ω resistor in series with the

IMP809/810 reset output and the µP/µC bi-directional reset pin.

duration transients of 100mV amplitude and 20µs or less duration

typically do not cause a false RESET.

To ensure logic inputs connected to the IMP809 RESET pin are in

resistor at RESET is needed. The value is not critical. A pull-up

Power

Supply

IMP810

VCC

GND

RESET

100k

Ω

809/10_05.eps

Power

Supply

IMP809

VCC

GND

RESET

100k

Ω

809/10_04.eps

Power

Supply

IMP809

VCC

GND

GND

RESET

4.7k

Ω

809/10_06.eps

Bi-directional I/O Pin

(Example: 68HC11)

BUF

Buffered

RESET

µC or µP

RESET

Input

Application Information

Figure 4. Bi-directional Reset Pin Interfacing