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HA16103FPJ

Watchdog Timer

Hitachi -> Renesas Electronics 

HA16103 FPJ/FPK

Power-On Reset Function

The system contains the power-on reset function required when a microcomputer is turned on.

The reset period may be set with external components RR and CR. Equation 2 specifies how to determine

the reset period (ton) and figure 3 shows the characteristic of the circuit.

HA16103

RES

RR CR

ton = 0.46 x CR x R Rx Vout(s) ⋅ ⋅ ⋅ ⋅ Equation 2

RR: Ω

200 m

180 m

(Ta = 25°C)

VCC = 12 V

160 m

140 m

CR = 0.22 µF

120 m

100 m

80 m

60 m

CR = 0.1 µF

40 m

20 m

CR = 0.047 µF

0

100 k

200 k

Resistance RR (Ω)

500 k

Figure 3 Characteristic of Power-On Reset Circuit

6

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