HA16103FPJ Ver la hoja de datos (PDF) - Renesas Electronics

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componentes Descripción

Lista de partido

HA16103FPJ

Watchdog Timer

Renesas Electronics 

HA16103FPJ/FPK

Precautions

If the IC’s ground potential varies suddenly by several volts due to wiring impedance (see figure 6), a false RES pulse

may be output. The reason for this is that potentials in the RES pulse generating circuit change together with the VOUT-

GND potential. The reference potential of the comparator in figure 7 and the potential of the external capacitor have

different impedances as seen from the comparator, causing a momentary inversion. The solution is to stabilize the

ground potential. Two ways of stabilizing the IC’s ground line are:

• Separate the IC’s ground line from highcurrent ground lines.

• Increase the capacitance (Co) used to smooth the VOUT output.

Wiring impedance

SW1

V IGN

SW2

HA16103PJ/FPJ Co

RL

Wiring impedance

Relay or other load

Figure 6 Typical Circuit

Vout

V CC Vcont

Wiring impedance

CRES

++

−–

GND

Figure 7 RES Comparator

RES

Rev.3.00 Jun 15, 2005 page 13 of 18

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